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Activity is completely blank when ran - maybe as a result of internet permissions?

I'm fairly new to java/android development so please bear with me.
I've created an app as part of a online course that should supposedly run a "Guess the celebrity game".
The issue is when i run my code the main activity is completely blank.
The strange part is that the app presented in the course runs without issue and i have followed the code word for word. I have managed to find one other candidate who has the same issue and cannot solve it.
There are no errors (that i can find) in the logs and i can't seem to find any posts with a similar issue.
This weird behaviour only occours when i add the following permission in the manifest xml:
<uses-permission android:name="android.permission.INTERNET" />
Screenshot of emulator (also tested on real device):
https://s9.postimg.org/su0gc58gf/Capture.png/
Code from MainActivity:
public class MainActivity extends Activity {
ArrayList<String> celebURLs = new ArrayList<String>();
ArrayList<String> celebNames = new ArrayList<String>();
int chosenCeleb = 0;
int locationOfCorrectAnswer = 0;
String[] answers = new String[4];
ImageView imageView;
Button button0;
Button button1;
Button button2;
Button button3;
public void celebChosen(View view) {
if (view.getTag().toString().equals(Integer.toString(locationOfCorrectAnswer))) {
Toast.makeText(getApplicationContext(), "Correct!", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(getApplicationContext(), "Wrong! It was " + celebNames.get(chosenCeleb), Toast.LENGTH_LONG).show();
}
createNewQuestion();
}
public class ImageDownloader extends AsyncTask<String, Void, Bitmap> {
#Override
protected Bitmap doInBackground(String... urls) {
try {
URL url = new URL(urls[0]);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.connect();
InputStream inputStream = connection.getInputStream();
Bitmap myBitmap = BitmapFactory.decodeStream(inputStream);
return myBitmap;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}
public class DownloadTask extends AsyncTask<String, Void, String> {
#Override
protected String doInBackground(String... urls) {
String result = "";
URL url;
HttpURLConnection urlConnection = null;
try {
url = new URL(urls[0]);
urlConnection = (HttpURLConnection) url.openConnection();
InputStream in = urlConnection.getInputStream();
InputStreamReader reader = new InputStreamReader(in);
int data = reader.read();
while (data != -1) {
char current = (char) data;
result += current;
data = reader.read();
}
return result;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imageView = (ImageView) findViewById(R.id.imageView);
button0 = (Button) findViewById(R.id.button1);
button1 = (Button) findViewById(R.id.button2);
button2 = (Button) findViewById(R.id.button3);
button3 = (Button) findViewById(R.id.button4);
DownloadTask task = new DownloadTask();
String result = null;
try {
result = task.execute("http://www.posh24.com/celebrities").get();
String[] splitResult = result.split("<div class=\"sidebarContainer\">");
Pattern p = Pattern.compile("<img src=\"(.*?)\"");
Matcher m = p.matcher(splitResult[0]);
while (m.find()) {
celebURLs.add(m.group(1));
}
p = Pattern.compile("alt=\"(.*?)\"");
m = p.matcher(splitResult[0]);
while (m.find()) {
celebNames.add(m.group(1));
}
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
createNewQuestion();
}
public void createNewQuestion() {
Random random = new Random();
chosenCeleb = random.nextInt(celebURLs.size());
ImageDownloader imageTask = new ImageDownloader();
Bitmap celebImage;
try {
celebImage = imageTask.execute(celebURLs.get(chosenCeleb)).get();
imageView.setImageBitmap(celebImage);
locationOfCorrectAnswer = random.nextInt(4);
int incorrectAnswerLocation;
for (int i = 0; i < 4; i++) {
if (i == locationOfCorrectAnswer) {
answers[i] = celebNames.get(chosenCeleb);
} else {
incorrectAnswerLocation = random.nextInt(celebURLs.size());
while (incorrectAnswerLocation == chosenCeleb) {
incorrectAnswerLocation = random.nextInt(celebURLs.size());
}
answers[i] = celebNames.get(incorrectAnswerLocation);
}
}
button0.setText(answers[0]);
button1.setText(answers[1]);
button2.setText(answers[2]);
button3.setText(answers[3]);
} catch (Exception e) {
e.printStackTrace();
}
}
}
Logs:
08-21 20:47:46.778 835-835/? I/Choreographer: Skipped 37 frames! The application may be doing too much work on its main thread.
08-21 20:47:49.283 421-519/? W/AudioTrack: AUDIO_OUTPUT_FLAG_FAST denied by client
--------- beginning of system
08-21 20:47:49.335 421-434/? I/ActivityManager: START u0 {act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10000000 cmp=com.example.shenstone.guessthecelebrity2/.MainActivity (has extras)} from uid 10007 on display 0
08-21 20:47:49.614 421-433/? I/art: Background sticky concurrent mark sweep GC freed 10530(678KB) AllocSpace objects, 3(608KB) LOS objects, 12% free, 9MB/10MB, paused 4.358ms total 263.235ms
08-21 20:47:49.854 69-69/? I/art: Background concurrent mark sweep GC freed 794(33KB) AllocSpace objects, 0(0B) LOS objects, 90% free, 111KB/1135KB, paused 12.562ms total 112.418ms
08-21 20:47:49.945 421-1030/? I/ActivityManager: Start proc com.example.shenstone.guessthecelebrity2 for activity com.example.shenstone.guessthecelebrity2/.MainActivity: pid=3562 uid=10055 gids={50055, 9997, 3003} abi=armeabi-v7a
08-21 20:47:49.982 3562-3562/? I/art: Not late-enabling -Xcheck:jni (already on)
08-21 20:47:52.244 3562-3574/? W/art: Suspending all threads took: 12.799ms
08-21 20:47:52.262 3562-3574/? I/art: Background partial concurrent mark sweep GC freed 322(512KB) AllocSpace objects, 0(0B) LOS objects, 64% free, 555KB/1579KB, paused 14.923ms total 43.870ms
08-21 20:47:52.395 3562-3574/? I/art: Background sticky concurrent mark sweep GC freed 219(436KB) AllocSpace objects, 0(0B) LOS objects, 28% free, 1129KB/1579KB, paused 9.677ms total 22.436ms
08-21 20:47:52.534 3562-3574/? I/art: WaitForGcToComplete blocked for 10.763ms for cause Background
08-21 20:47:53.258 3562-3574/? I/art: Background sticky concurrent mark sweep GC freed 469(1634KB) AllocSpace objects, 0(0B) LOS objects, 58% free, 660KB/1599KB, paused 6.830ms total 31.639ms
08-21 20:47:56.495 3562-3573/? I/art: WaitForGcToComplete blocked for 21.032ms for cause HeapTrim
08-21 20:47:59.381 421-443/? W/ActivityManager: Launch timeout has expired, giving up wake lock!
08-21 20:48:00.154 3562-3574/? W/art: Suspending all threads took: 39.137ms
08-21 20:48:00.183 3562-3574/? I/art: Background partial concurrent mark sweep GC freed 108(3KB) AllocSpace objects, 57(862KB) LOS objects, 60% free, 663KB/1687KB, paused 41.100ms total 174.221ms
08-21 20:48:00.244 3562-3574/? W/art: Suspending all threads took: 10.311ms
08-21 20:48:00.255 3562-3574/? I/art: Background sticky concurrent mark sweep GC freed 53(1872B) AllocSpace objects, 30(451KB) LOS objects, 56% free, 728KB/1687KB, paused 12.216ms total 26.132ms
08-21 20:48:00.354 3562-3574/? W/art: Suspending all threads took: 9.038ms
08-21 20:48:00.415 3562-3574/? I/art: Background partial concurrent mark sweep GC freed 135(4KB) AllocSpace objects, 81(1221KB) LOS objects, 48% free, 1094KB/2MB, paused 12.238ms total 111.401ms
Any help would be much appreciated, thanks!

You are using the AsyncTask but did not started it. Use execute() method to start your async task.

Android: NullPointerException when the application attempts to encrypt .txt file

I am trying to encrypt/decrypt a file from my virtual device (Genymotion). I will show you the code and the exceptions that i have. I guess that the nullPointerException comes from the line where i declare View v = null in onActivityResult method but i do not know how to fix it.
Exceptions
07-22 13:34:10.241 10419-10419/? E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: application.nikola.com.encryptdecrypt, PID: 10419
java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { dat=file:///storage/emulated/0/nikola.txt }} to activity {application.nikola.com.encryptdecrypt/application.nikola.com.encryptdecrypt.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.view.View.getId()' on a null object reference
at android.app.ActivityThread.deliverResults(ActivityThread.java:3539)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:3582)
at android.app.ActivityThread.access$1300(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1327)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.view.View.getId()' on a null object reference
at application.nikola.com.encryptdecrypt.MainActivity.onActivityResult(MainActivity.java:70)
at android.app.Activity.dispatchActivityResult(Activity.java:6135)
at android.app.ActivityThread.deliverResults(ActivityThread.java:3535)
            at android.app.ActivityThread.handleSendResult(ActivityThread.java:3582)
            at android.app.ActivityThread.access$1300(ActivityThread.java:144)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1327)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5221)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
07-22 13:34:10.263 765-1598/? W/ActivityManager﹕ Force finishing activity application.nikola.com.encryptdecrypt/.MainActivity
07-22 13:34:10.350 765-1598/? E/ActivityManager﹕ Invalid thumbnail dimensions: 576x576
07-22 13:34:10.400 765-2035/? I/OpenGLRenderer﹕ Initialized EGL, version 1.4
07-22 13:34:10.466 765-2035/? W/EGL_emulation﹕ eglSurfaceAttrib not implemented
07-22 13:34:10.466 765-2035/? W/OpenGLRenderer﹕ Failed to set EGL_SWAP_BEHAVIOR on surface 0x9ea263c0, error=EGL_SUCCESS
07-22 13:34:10.903 765-786/? W/ActivityManager﹕ Activity pause timeout for ActivityRecord{2ef175ff u0 application.nikola.com.encryptdecrypt/.MainActivity t26 f}
07-22 13:34:11.032 1006-1265/? W/EGL_emulation﹕ eglSurfaceAttrib not implemented
07-22 13:34:11.033 1006-1265/? W/OpenGLRenderer﹕ Failed to set EGL_SWAP_BEHAVIOR on surface 0xa095a020, error=EGL_SUCCESS
07-22 13:34:11.786 2640-2640/? I/art﹕ Explicit concurrent mark sweep GC freed 3007(201KB) AllocSpace objects, 0(0B) LOS objects, 24% free, 16MB/21MB, paused 301us total 21.960ms
07-22 13:34:11.808 2640-2640/? I/art﹕ Explicit concurrent mark sweep GC freed 3080(224KB) AllocSpace objects, 4(252KB) LOS objects, 24% free, 15MB/21MB, paused 173us total 7.668ms
07-22 13:34:11.822 2640-2640/? I/art﹕ Explicit concurrent mark sweep GC freed 3(96B) AllocSpace objects, 0(0B) LOS objects, 24% free, 15MB/21MB, paused 237us total 13.937ms
07-22 13:34:12.735 10419-10419/? I/Process﹕ Sending signal. PID: 10419 SIG: 9
07-22 13:34:12.738 765-823/? W/AudioTrack﹕ AUDIO_OUTPUT_FLAG_FAST denied by client
07-22 13:34:12.764 765-805/? W/InputDispatcher﹕ channel '25d12a93 application.nikola.com.encryptdecrypt/application.nikola.com.encryptdecrypt.MainActivity (server)' ~ Consumer closed input channel or an error occurred. events=0x9
07-22 13:34:12.764 765-805/? E/InputDispatcher﹕ channel '25d12a93 application.nikola.com.encryptdecrypt/application.nikola.com.encryptdecrypt.MainActivity (server)' ~ Channel is unrecoverably broken and will be disposed!
07-22 13:34:12.777 765-782/? I/ActivityManager﹕ Process application.nikola.com.encryptdecrypt (pid 10419) has died
07-22 13:34:12.778 765-981/? I/WindowState﹕ WIN DEATH: Window{25d12a93 u0 application.nikola.com.encryptdecrypt/application.nikola.com.encryptdecrypt.MainActivity}
07-22 13:34:12.778 765-981/? W/InputDispatcher﹕ Attempted to unregister already unregistered input channel '25d12a93 application.nikola.com.encryptdecrypt/application.nikola.com.encryptdecrypt.MainActivity (server)'
MainActivity
public class MainActivity extends Activity implements View.OnClickListener {
Button btnEncrypt;
Button btnDecrypt;
final int ACTIVITY_CHOOSE_FILE = 1;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnEncrypt = (Button) this.findViewById(R.id.btnActivity1);
btnEncrypt.setOnClickListener(this);
btnDecrypt = (Button) this.findViewById(R.id.btnActivity2);
btnDecrypt.setOnClickListener(this);
}
#Override
public void onClick(View v) {
Intent chooseFile;
Intent intent;
chooseFile = new Intent(Intent.ACTION_GET_CONTENT);
chooseFile.setType("file*//*");
intent = Intent.createChooser(chooseFile, "Choose a file");
startActivityForResult(intent, ACTIVITY_CHOOSE_FILE);
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
EncryptDecrypt crypto = new EncryptDecrypt();
View v = null;
String filePath = null;
switch(requestCode) {
case ACTIVITY_CHOOSE_FILE: {
if (resultCode == RESULT_OK){
Uri uri = data.getData();
filePath = uri.getPath();
switch(v.getId()) {
case R.id.btnActivity1:
crypto.encryptor(filePath);
break;
case R.id.btnActivity2:
crypto.decryptor(filePath);
break;
}
}
}
}
}
}
This is is the encrypt/decrypt algorithm that i use.
public class EncryptDecrypt {
public void encryptor(String inputFilePath) {
FileOutputStream fos = null;
File file = new File(inputFilePath);
String keyString = "140405PX_0.$88";
String algorithm = "DESede";
try {
FileInputStream fileInputStream = new FileInputStream(file);
byte[] fileByteArray = new byte[fileInputStream.available()];
fileInputStream.read(fileByteArray);
for (byte b : fileByteArray) {
System.out.println(b);
}
SecretKey secretKey = getKey(keyString);
Cipher cipher = Cipher.getInstance(algorithm);
cipher.init(Cipher.ENCRYPT_MODE, secretKey);
ObjectOutputStream objectOutputStream = new ObjectOutputStream(new CipherOutputStream(new FileOutputStream("encrypt.file"), cipher));
objectOutputStream.writeObject(fileByteArray);
objectOutputStream.close();
} catch (Exception e) {
e.printStackTrace();
}
}
public void decryptor(String inputFilePath) {
String outputFilePath = "decrypt.txt";
String keyString = "140405PX_0.$88";
String algorithm = "DESede";
try {
File inputFileNAme = new File(inputFilePath);
FileInputStream fileInputStream = new FileInputStream(inputFileNAme);
FileOutputStream fileOutputStream = new FileOutputStream(outputFilePath);
SecretKey secretKey = getKey(keyString);
Cipher cipher = Cipher.getInstance(algorithm);
cipher.init(Cipher.DECRYPT_MODE, secretKey);
ObjectInputStream objectInputStream = new ObjectInputStream(new CipherInputStream(fileInputStream, cipher));
System.out.println(objectInputStream.available());
fileOutputStream.write((byte[]) objectInputStream.readObject());
fileOutputStream.flush();
fileOutputStream.close();
fileInputStream.close();
objectInputStream.close();
} catch (Exception e) {
e.printStackTrace();
}
}
public static SecretKey getKey(String message) throws Exception {
String messageToUpperCase = message.toUpperCase();
byte[] digestOfPassword = messageToUpperCase.getBytes();
byte[] keyBytes = Arrays.copyOf(digestOfPassword, 24);
SecretKey key = new SecretKeySpec(keyBytes, "DESede");
return key;
}
}

View v = null; // v is null
String filePath = null;
switch(requestCode) {
case ACTIVITY_CHOOSE_FILE: {
if (resultCode == RESULT_OK){
Uri uri = data.getData();
filePath = uri.getPath();
switch(v.getId()) { // v is still null
case R.id.btnActivity1:
crypto.encryptor(filePath);
break;
case R.id.btnActivity2:
crypto.decryptor(filePath);
break;
}
}
}
}
your vis null and you are trying to do v.getId(). That is why you are getting NullPointerException.
In order to fix this, You might want to add a OnClickListener to your btnActivity1 and btnActivity2.
btnActivity1.setOnCLickListerner(new OnClickListener() {
#Override
public void onClick(View arg0) {
crypto.encryptor(filePath);
}
});
}
btnActivity2.setOnCLickListerner(new OnClickListener() {
#Override
public void onClick(View arg0) {
crypto.decryptor(filePath);
}
});
}

In your switch-case of MainActivity, you are using v.getId() but v is initialized to null therefore you are getting NullPointerException
Guessing what you are trying to do is that you are trying to decide whether to decrypt or encrypt the file based on whether two of the buttons in your layout is clicked. But you are not doing it in a proper way. Use OnClickListener for each button and set a boolean flag to check whether to decrypt or encrypt at onClick event of those buttons. Then show your FILE CHOOSER.
You can modify your MainActivity in this way
public class MainActivity extends Activity implements View.OnClickListener {
Button btnEncrypt;
Button btnDecrypt;
boolean encrypt=false;
final int ACTIVITY_CHOOSE_FILE = 1;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnEncrypt = (Button) this.findViewById(R.id.btnActivity1);
btnEncrypt.setOnClickListener(this);
btnDecrypt = (Button) this.findViewById(R.id.btnActivity2);
btnDecrypt.setOnClickListener(this);
}
#Override
public void onClick(View v) {
switch(v.getId()) {
case R.id.btnActivity1:
encrypt=true;
break;
case R.id.btnActivity2:
encrypt=false;
break;
}
Intent chooseFile;
Intent intent;
chooseFile = new Intent(Intent.ACTION_GET_CONTENT);
chooseFile.setType("file*//*");
intent = Intent.createChooser(chooseFile, "Choose a file");
startActivityForResult(intent, ACTIVITY_CHOOSE_FILE);
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
EncryptDecrypt crypto = new EncryptDecrypt();
String filePath = null;
switch(requestCode) {
case ACTIVITY_CHOOSE_FILE: {
if (resultCode == RESULT_OK){
Uri uri = data.getData();
filePath = uri.getPath();
switch(encrypt) {
case true:
crypto.encryptor(filePath);
break;
case false:
crypto.decryptor(filePath);
break;
}
}
}
}
}
}

unfortunately has stopped when I want to update ListView

My logic is as follows.
First, I get some data from the server. Then, I manipulate the data. Next, I put the data into a ListView. If the user scrolls to the bottom of this view, I want to refresh the view. I copy the properties from my Async object to a new object. At this point I see "unfortunately has stopped".
Here my code of activity class
DatePickerDialog.OnDateSetListener d = new DatePickerDialog.OnDateSetListener() {
#Override
public void onDateSet(DatePicker view, int year, int monthOfYear,
int dayOfMonth) {
calendar.set(Calendar.YEAR, year);
calendar.set(Calendar.MONTH,monthOfYear);
this.Syear = calendar.get(Calendar.YEAR);
this.Smonth = calendar.get(Calendar.MONTH);
Smonth = Smonth + 1;
InboxActivity i = new InboxActivity();
String user_id = getIntent().getExtras().getString(LoginActivity.SESSION_ID);
final FetchTask fetch = new FetchTask();
fetch.Selectedmonth = this.Smonth;
fetch.Selectedyear = this.Syear;
fetch.page = 0;
fetch.sess_id = user_id;
ListView ll = (ListView)findViewById(R.id.mailList);
fetch.ll = ll;
fetch.execute();
ll.setOnScrollListener(new OnScrollListener(){
#Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount)
{
if(firstVisibleItem+visibleItemCount==totalItemCount)
{
//System.out.println("HERE WILL BE MY SESSION ID!!!!w");
//System.out.println(fetch.sess_id);
FetchTask RefreshFetch = new FetchTask();
fetch.page++;
RefreshFetch.page = fetch.page++;
RefreshFetch.Selectedmonth = fetch.Selectedmonth;
RefreshFetch.Selectedyear = fetch.Selectedyear;
RefreshFetch.sess_id = fetch.sess_id;
RefreshFetch.ll = fetch.ll;
RefreshFetch.execute();
}
}
});
}
};
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.login, menu);
return true;
}
public class FetchTask extends AsyncTask<Void, Void, JSONArray> {
public JSONArray result_arr;
public String result_str,email,password,test;
public int Selectedyear;
public int Selectedmonth;
public int page;
public String sess_id;
public ListView ll;
public ProgressDialog pd;
public ArrayAdapter<String> adapter;
#Override
protected JSONArray doInBackground(Void... params) {
try {
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("MY SITE URL ....");
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("qw", "das"));
nameValuePairs.add(new BasicNameValuePair("debug", "1"));
nameValuePairs.add(new BasicNameValuePair("t", "0"));
nameValuePairs.add(new BasicNameValuePair("m", Integer.toString(this.Selectedmonth)));
nameValuePairs.add(new BasicNameValuePair("y", Integer.toString(this.Selectedyear)));
nameValuePairs.add(new BasicNameValuePair("st", Integer.toString(this.page)));
nameValuePairs.add(new BasicNameValuePair("sess_id", this.sess_id));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
// Execute HTTP Post Request
HttpResponse response = httpclient.execute(httppost);
BufferedReader reader = new BufferedReader(new InputStreamReader(response.getEntity().getContent(), "utf-8"), 8);
StringBuilder sb = new StringBuilder();
sb.append(reader.readLine());
String line = "0";
while ((line = reader.readLine()) != null)
{
sb.append(line);
}
reader.close();
String result11 = sb.toString();
this.result_str = result11;
// parsing data
JSONArray arr = new JSONArray(result11);
return new JSONArray(result11);
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
#Override
protected void onPreExecute() {
}
My logs
03-05 13:24:43.239: D/dalvikvm(2052): GC_FOR_ALLOC freed 49K, 7% free 3326K/3540K, paused 33ms, total 35ms
03-05 13:24:43.629: D/gralloc_goldfish(2052): Emulator without GPU emulation detected.
03-05 13:24:50.349: D/dalvikvm(2052): GC_FOR_ALLOC freed 151K, 8% free 3690K/4004K, paused 28ms, total 36ms
03-05 13:24:50.349: D/InputEventConsistencyVerifier(2052): KeyEvent: ACTION_UP but key was not down.
03-05 13:24:50.349: D/InputEventConsistencyVerifier(2052): in android.widget.EditText{b1e53a20 VFED..CL .F....I. 179,489-589,548 #7f090004 app:id/password}
03-05 13:24:50.349: D/InputEventConsistencyVerifier(2052): 0: sent at 11916532000000, KeyEvent { action=ACTION_UP, keyCode=KEYCODE_TAB, scanCode=15, metaState=0, flags=0x8, repeatCount=0, eventTime=11916532, downTime=11916440, deviceId=0, source=0x101 }
03-05 13:24:55.809: D/dalvikvm(2052): GC_FOR_ALLOC freed 417K, 14% free 3788K/4368K, paused 31ms, total 31ms
03-05 13:24:56.509: D/dalvikvm(2052): GC_FOR_ALLOC freed 89K, 12% free 3877K/4368K, paused 39ms, total 42ms
03-05 13:24:56.549: D/dalvikvm(2052): GC_FOR_ALLOC freed 28K, 12% free 3947K/4468K, paused 39ms, total 40ms
03-05 13:24:56.599: I/dalvikvm-heap(2052): Grow heap (frag case) to 5.087MB for 1127536-byte allocation
03-05 13:24:56.649: D/dalvikvm(2052): GC_FOR_ALLOC freed <1K, 10% free 5048K/5572K, paused 48ms, total 48ms
03-05 13:25:14.239: D/dalvikvm(2052): GC_FOR_ALLOC freed 504K, 12% free 5273K/5940K, paused 56ms, total 58ms
03-05 13:25:15.319: I/Choreographer(2052): Skipped 125 frames! The application may be doing too much work on its main thread.
03-05 13:25:15.809: I/Choreographer(2052): Skipped 49 frames! The application may be doing too much work on its main thread.
03-05 13:25:16.209: I/Choreographer(2052): Skipped 34 frames! The application may be doing too much work on its main thread.
03-05 13:25:17.249: I/Choreographer(2052): Skipped 87 frames! The application may be doing too much work on its main thread.
03-05 13:25:17.599: I/Choreographer(2052): Skipped 35 frames! The application may be doing too much work on its main thread.
03-05 13:25:22.239: I/Choreographer(2052): Skipped 37 frames! The application may be doing too much work on its main thread.
03-05 13:25:22.659: I/Choreographer(2052): Skipped 42 frames! The application may be doing too much work on its main thread.
03-05 13:25:23.629: I/Choreographer(2052): Skipped 98 frames! The application may be doing too much work on its main thread.
03-05 13:25:24.819: D/AndroidRuntime(2052): Shutting down VM
03-05 13:25:24.819: W/dalvikvm(2052): threadid=1: thread exiting with uncaught exception (group=0xb1aefba8)
03-05 13:25:24.919: E/AndroidRuntime(2052): FATAL EXCEPTION: main
03-05 13:25:24.919: E/AndroidRuntime(2052): Process: com.example.earchive, PID: 2052
03-05 13:25:24.919: E/AndroidRuntime(2052): java.lang.NullPointerException
03-05 13:25:24.919: E/AndroidRuntime(2052): at com.example.earchive.InboxActivity$FetchTask.onPostExecute(InboxActivity.java:291)
03-05 13:25:24.919: E/AndroidRuntime(2052): at com.example.earchive.InboxActivity$FetchTask.onPostExecute(InboxActivity.java:1)
03-05 13:25:24.919: E/AndroidRuntime(2052): at android.os.AsyncTask.finish(AsyncTask.java:632)
03-05 13:25:24.919: E/AndroidRuntime(2052): at android.os.AsyncTask.access$600(AsyncTask.java:177)
03-05 13:25:24.919: E/AndroidRuntime(2052): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:645)
03-05 13:25:24.919: E/AndroidRuntime(2052): at android.os.Handler.dispatchMessage(Handler.java:102)
03-05 13:25:24.919: E/AndroidRuntime(2052): at android.os.Looper.loop(Looper.java:136)
03-05 13:25:24.919: E/AndroidRuntime(2052): at android.app.ActivityThread.main(ActivityThread.java:5017)
03-05 13:25:24.919: E/AndroidRuntime(2052): at java.lang.reflect.Method.invokeNative(Native Method)
03-05 13:25:24.919: E/AndroidRuntime(2052): at java.lang.reflect.Method.invoke(Method.java:515)
03-05 13:25:24.919: E/AndroidRuntime(2052): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
03-05 13:25:24.919: E/AndroidRuntime(2052): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
03-05 13:25:24.919: E/AndroidRuntime(2052): at dalvik.system.NativeStart.main(Native Method)
03-05 13:25:26.259: D/dalvikvm(2052): GC_FOR_ALLOC freed 385K, 9% free 5692K/6240K, paused 145ms, total 145ms
On post execute method
protected void onPostExecute(JSONArray result)
{
if (result != null)
{
List<String> subjects = new ArrayList<String>();
List<String> emails = new ArrayList<String>();
for(int i = 0; i < result.length(); i++)
{
try
{
JSONObject json_data = result.getJSONObject(i);
emails.add(json_data.getString("mittente"));
subjects.add(json_data.getString("oggetto"));
}
catch (JSONException e)
{
e.printStackTrace();
}
}
if(this.page == 0)
{
this.adapter = new ArrayAdapter<String>(
InboxActivity.this,
R.layout.da_item,
emails
);
this.ll.setAdapter(this.adapter);
}
else
{
for(int i = 0; i < result.length(); i++)
{
JSONObject json_data;
try
{
json_data = result.getJSONObject(i);
this.adapter.add(json_data.getString("mittente"));
}
catch (JSONException e)
{
e.printStackTrace();
}
}
}
}
else
{
System.out.println("Messages not found");
}
this.pd.dismiss();
}
}

Your this.adapter.add(json_data.getString("mittente")); is throwing a NullPointerException.
If page = 1, this.adapter is not initialized (page = 0) and is therefore NULL. If page 0 is guaranteed to be called before page 1, this would work, but I'm guessing it is not. Here's a fix if I understand your code correctly.
if( this.adapter == null ) {
this.adapter = new ArrayAdapter<String>(
InboxActivity.this,
R.layout.da_item,
emails
);
this.ll.setAdapter(this.adapter);
}
if(this.page != 0)
{
for(int i = 0; i < result.length(); i++)
{
JSONObject json_data;
try
{
json_data = result.getJSONObject(i);
this.adapter.add(json_data.getString("mittente"));
}
catch (JSONException e)
{
e.printStackTrace();
}
}
}

Cursor is Null in Service Class - But Returns Value in Standalone Activity Class

My classmates and I are stuck on an issue with android application we are building.
We've successfully built an Android app which contains an activity which searches our browser histories / bookmarks for specific urls and launches another activity (successfully) if a match is found as an example of an adult content warning implementation.
This is functioning fine.
Now we are implementing a service class to continually execute every few seconds - in order to execute the search of our recent history using our new service class - but we're experiencing a few issues.
Our problem is when we attempt to add the "Nanny" source code from Nanny.java to the service class so the "Nanny" script will search the history continuously, instead of just once - the "Nanny" application continually force closes - due to a null pointer exception at the initialization of our cursor: if (cursor.moveToFirst()) {
Which is a bit strange because the NullPointerException does not occur when the exact same script is executed outside the service class in a test file we have (Main.java)
Our working Main.java and our working service class [which successfully displays a toast every few seconds] as well as our [failed] combination of the two - are shown below:
Empty Service Class:
public class Service_class extends Service {
#Override
public IBinder onBind(Intent arg0) {
return null;
}
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
Toast.makeText(this, "Service Started", Toast.LENGTH_LONG).show();
return START_STICKY;
}
#Override
public void onDestroy() {
super.onDestroy();
Toast.makeText(this, "Service Stopped", Toast.LENGTH_LONG).show();
}
#Override
public void onCreate() {
super.onCreate();
}
}
Working Nanny.java
import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.Browser;
import android.widget.TextView;
public class Nanny extends Activity {
String Dirty1 = "www.playboy.com";
String Dirty2 = "www.penthouse.com";
String Dirty3 = "www.pornhub.com";
String Dirty4 = "www.playboy.com";
String Dirty5 = "www.playboy.com";
String Dirty6 = "www.playboy.com";
String Dirty7 = "www.playboy.com";
String Dirty8 = "www.playboy.com";
String Dirty9 = "www.playboy.com";
String Dirty10 = "www.playboy.com";
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.nanny);
TextView tv = (TextView) findViewById(R.id.hello);
String[] projection = new String[] { Browser.BookmarkColumns.TITLE,
Browser.BookmarkColumns.URL };
Cursor cursor = managedQuery(android.provider.Browser.BOOKMARKS_URI,
projection, null, null, null);
String urls = "";
if (cursor.moveToFirst()) {
String url1 = null;
String url2 = null;
do {
String url = cursor.getString(cursor.getColumnIndex(Browser.BookmarkColumns.URL));
if (url.toLowerCase().contains(Dirty1)) {
} else if (url.toLowerCase().contains(Dirty2)) {
} else if (url.toLowerCase().contains(Dirty3)) {
} else if (url.toLowerCase().contains(Dirty4)) {
} else if (url.toLowerCase().contains(Dirty5)) {
} else if (url.toLowerCase().contains(Dirty6)) {
} else if (url.toLowerCase().contains(Dirty7)) {
} else if (url.toLowerCase().contains(Dirty8)) {
} else if (url.toLowerCase().contains(Dirty9)) {
} else if (url.toLowerCase().contains(Dirty10)) {
//if (url.toLowerCase().contains(Filthy)) {
urls = urls
+ cursor.getString(cursor.getColumnIndex(Browser.BookmarkColumns.TITLE)) + " : "
+ url + "\n";
Intent intent = new Intent(Nanny.this, Warning.class);
Nanny.this.startActivity(intent);
}
} while (cursor.moveToNext());
tv.setText(urls);
}}}
Unsuccessful method we've attempted to implement (adding the functioning nanny script to the service class) which causes the NullPointerException: if (cursor.moveToFirst()) {
public class Service_class extends Service {
String Dirty1 = "www.playboy.com";
String Dirty2 = "www.penthouse.com";
String Dirty3 = "www.pornhub.com";
String Dirty4 = "www.playboy.com";
String Dirty5 = "www.playboy.com";
String Dirty6 = "www.playboy.com";
String Dirty7 = "www.playboy.com";
String Dirty8 = "www.playboy.com";
String Dirty9 = "www.playboy.com";
String Dirty10 = "www.playboy.com";
#Override
public IBinder onBind(Intent arg0) {
return null;
}
#Override
public int onStartCommand(Intent intent, int flags, int startId) {
Toast.makeText(this, "Service Started", Toast.LENGTH_LONG).show();
//setContentView(R.layout.main3);
// TextView tv = (TextView) findViewById(R.id.hello);
String[] projection = new String[] { Browser.BookmarkColumns.TITLE,
Browser.BookmarkColumns.URL };
Cursor cursor = managedQuery(android.provider.Browser.BOOKMARKS_URI,
projection, null, null, null);
String urls = "";
if (cursor.moveToFirst()) {
String url1 = null;
String url2 = null;
do {
String url = cursor.getString(cursor.getColumnIndex(Browser.BookmarkColumns.URL));
if (url.toLowerCase().contains(Dirty1)) {
} else if (url.toLowerCase().contains(Dirty2)) {
} else if (url.toLowerCase().contains(Dirty3)) {
} else if (url.toLowerCase().contains(Dirty4)) {
} else if (url.toLowerCase().contains(Dirty5)) {
} else if (url.toLowerCase().contains(Dirty6)) {
} else if (url.toLowerCase().contains(Dirty7)) {
} else if (url.toLowerCase().contains(Dirty8)) {
} else if (url.toLowerCase().contains(Dirty9)) {
} else if (url.toLowerCase().contains(Dirty10)) {
urls = urls
+ cursor.getString(cursor.getColumnIndex(Browser.BookmarkColumns.TITLE)) + " : "
+ url + "\n";
Intent warning_intent = new Intent(Service_class.this, Warning.class);
Service_class.this.startActivity(intent);
}
} while (cursor.moveToNext());
// tv.setText(urls);
return START_STICKY;
}
return startId;}
#Override
public void onDestroy() {
super.onDestroy();
Toast.makeText(this, "Service Stopped", Toast.LENGTH_LONG).show();
}
#Override
public void onCreate() {
super.onCreate();
}
private void setContentView(int main3) {
// TODO Auto-generated method stub
}
private TextView findViewById(int hello) {
// TODO Auto-generated method stub
return null;
}
private Cursor managedQuery(Uri bookmarksUri, String[] projection,
Object object, Object object2, Object object3) {
// TODO Auto-generated method stub
return null;
}}
LOGCAT (When using combined implementation shown above)
Fails on Line 53: if (cursor.moveToFirst()) {
04-15 18:26:24.761: D/dalvikvm(7466): Late-enabling CheckJNI
04-15 18:26:25.651: D/dalvikvm(7466): GC_FOR_ALLOC freed 82K, 4% free 7379K/7608K, paused 13ms, total 13ms
04-15 18:26:25.651: I/dalvikvm-heap(7466): Grow heap (frag case) to 10.861MB for 3686416-byte allocation
04-15 18:26:25.661: D/dalvikvm(7466): GC_FOR_ALLOC freed 1K, 3% free 10977K/11212K, paused 13ms, total 13ms
04-15 18:26:25.681: D/dalvikvm(7466): GC_CONCURRENT freed <1K, 3% free 10977K/11212K, paused 3ms+2ms, total 17ms
04-15 18:26:25.901: D/dalvikvm(7466): GC_FOR_ALLOC freed <1K, 3% free 10977K/11212K, paused 11ms, total 11ms
04-15 18:26:25.911: I/dalvikvm-heap(7466): Grow heap (frag case) to 17.086MB for 6529744-byte allocation
04-15 18:26:25.931: D/dalvikvm(7466): GC_FOR_ALLOC freed 0K, 2% free 17354K/17592K, paused 13ms, total 13ms
04-15 18:26:25.941: D/dalvikvm(7466): GC_CONCURRENT freed <1K, 2% free 17354K/17592K, paused 3ms+2ms, total 16ms
04-15 18:26:26.051: D/libEGL(7466): loaded /system/lib/egl/libEGL_tegra.so
04-15 18:26:26.061: D/libEGL(7466): loaded /system/lib/egl/libGLESv1_CM_tegra.so
04-15 18:26:26.071: D/libEGL(7466): loaded /system/lib/egl/libGLESv2_tegra.so
04-15 18:26:26.091: D/OpenGLRenderer(7466): Enabling debug mode 0
04-15 18:26:31.181: D/AndroidRuntime(7466): Shutting down VM
04-15 18:26:31.181: W/dalvikvm(7466): threadid=1: thread exiting with uncaught exception (group=0x40f4f930)
04-15 18:26:31.181: E/AndroidRuntime(7466): FATAL EXCEPTION: main
04-15 18:26:31.181: E/AndroidRuntime(7466): java.lang.RuntimeException: Unable to start service com.ut.appdemo.Service_class#41698e90 with Intent { cmp=com.ut.appdemo/.Service_class }: java.lang.NullPointerException
04-15 18:26:31.181: E/AndroidRuntime(7466): at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2673)
04-15 18:26:31.181: E/AndroidRuntime(7466): at android.app.ActivityThread.access$1900(ActivityThread.java:141)
04-15 18:26:31.181: E/AndroidRuntime(7466): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1331)
04-15 18:26:31.181: E/AndroidRuntime(7466): at android.os.Handler.dispatchMessage(Handler.java:99)
04-15 18:26:31.181: E/AndroidRuntime(7466): at android.os.Looper.loop(Looper.java:137)
04-15 18:26:31.181: E/AndroidRuntime(7466): at android.app.ActivityThread.main(ActivityThread.java:5041)
04-15 18:26:31.181: E/AndroidRuntime(7466): at java.lang.reflect.Method.invokeNative(Native Method)
04-15 18:26:31.181: E/AndroidRuntime(7466): at java.lang.reflect.Method.invoke(Method.java:511)
04-15 18:26:31.181: E/AndroidRuntime(7466): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
04-15 18:26:31.181: E/AndroidRuntime(7466): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
04-15 18:26:31.181: E/AndroidRuntime(7466): at dalvik.system.NativeStart.main(Native Method)
04-15 18:26:31.181: E/AndroidRuntime(7466): Caused by: java.lang.NullPointerException
04-15 18:26:31.181: E/AndroidRuntime(7466): at com.ut.appdemo.Service_class.onStartCommand(Service_class.java:53)
04-15 18:26:31.181: E/AndroidRuntime(7466): at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2656)
04-15 18:26:31.181: E/AndroidRuntime(7466): ... 10 more

You are setting the cursor to null...
you use this method to instantiate the cursor:
Cursor cursor = managedQuery(android.provider.Browser.BOOKMARKS_URI,projection, null, null, null);
and then you define managedQuery() method like this:
private Cursor managedQuery(Uri bookmarksUri, String[] projection, Object object, Object object2, Object object3) {
// TODO Auto-generated method stub
return null;
}}
essentially what your code says is:
Cursor cursor = null;
curser.doSomething();
this will always result in a nullPointer. I strongly suggest you go back and study java fundamentals before diving in to android, you are just asking for headaches if you are trying to accomplish something in android with such a lack of understanding of java.

When i press on button app force closes? Android

When i run my app, and i press on a button it force closes. I fixed my Android manifest and i cannot find the problem. Here is the Logcat:
03-09 17:46:17.301: D/dalvikvm(2133): Debugger has detached; object registry had 1 entries
03-09 17:46:17.438: D/dalvikvm(2133): GC_EXTERNAL_ALLOC freed 43K, 49% free 2794K/5379K, external 1596K/2108K, paused 95ms
03-09 17:46:17.587: D/dalvikvm(2133): GC_EXTERNAL_ALLOC freed 1K, 49% free 2793K/5379K, external 3471K/4335K, paused 42ms
03-09 17:46:17.825: D/dalvikvm(2133): GC_EXTERNAL_ALLOC freed <1K, 49% free 2795K/5379K, external 5048K/5580K, paused 76ms
03-09 17:46:18.001: D/dalvikvm(2133): GC_EXTERNAL_ALLOC freed <1K, 49% free 2796K/5379K, external 8143K/8403K, paused 44ms
03-09 17:46:49.407: D/dalvikvm(2133): GC_EXTERNAL_ALLOC freed 15K, 48% free 2825K/5379K, external 11785K/11958K, paused 19ms
03-09 17:46:49.544: D/dalvikvm(2133): GC_EXTERNAL_ALLOC freed 1K, 48% free 2826K/5379K, external 13363K/14068K, paused 19ms
03-09 17:46:49.622: D/dalvikvm(2133): GC_EXTERNAL_ALLOC freed <1K, 48% free 2827K/5379K, external 16457K/17091K, paused 19ms
03-09 17:46:49.704: D/AndroidRuntime(2133): Shutting down VM
03-09 17:46:49.704: W/dalvikvm(2133): threadid=1: thread exiting with uncaught exception (group=0x40015578)
03-09 17:46:49.708: E/AndroidRuntime(2133): FATAL EXCEPTION: main
03-09 17:46:49.708: E/AndroidRuntime(2133): java.lang.RuntimeException: Unable to start activity ComponentInfo{izzy.n/izzy.n.main1}: java.lang.NullPointerException
03-09 17:46:49.708: E/AndroidRuntime(2133): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1651)
03-09 17:46:49.708: E/AndroidRuntime(2133): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667)
03-09 17:46:49.708: E/AndroidRuntime(2133): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
03-09 17:46:49.708: E/AndroidRuntime(2133): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
03-09 17:46:49.708: E/AndroidRuntime(2133): at android.os.Handler.dispatchMessage(Handler.java:99)
03-09 17:46:49.708: E/AndroidRuntime(2133): at android.os.Looper.loop(Looper.java:130)
03-09 17:46:49.708: E/AndroidRuntime(2133): at android.app.ActivityThread.main(ActivityThread.java:3687)
03-09 17:46:49.708: E/AndroidRuntime(2133): at java.lang.reflect.Method.invokeNative(Native Method)
03-09 17:46:49.708: E/AndroidRuntime(2133): at java.lang.reflect.Method.invoke(Method.java:507)
03-09 17:46:49.708: E/AndroidRuntime(2133): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842)
03-09 17:46:49.708: E/AndroidRuntime(2133): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
03-09 17:46:49.708: E/AndroidRuntime(2133): at dalvik.system.NativeStart.main(Native Method)
03-09 17:46:49.708: E/AndroidRuntime(2133): Caused by: java.lang.NullPointerException
03-09 17:46:49.708: E/AndroidRuntime(2133): at izzy.n.main1.populateCalendarSpinner(main1.java:69)
03-09 17:46:49.708: E/AndroidRuntime(2133): at izzy.n.main1.onCreate(main1.java:52)
03-09 17:46:49.708: E/AndroidRuntime(2133): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
03-09 17:46:49.708: E/AndroidRuntime(2133): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1615)
03-09 17:46:49.708: E/AndroidRuntime(2133): ... 11 more
Here is the code for Android Manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="izzy.n"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="10" />
<uses-permission android:name="android.permission.READ_CALENDAR"></uses-permission>
<uses-permission android:name="android.permission.WRITE_CALENDAR"></uses-permission>
<application
android:icon="#drawable/ic_launcher"
android:label="#string/app_name" >
<activity
android:name="izzy.n.IzzynActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="izzy.n.notes"
android:label="#string/notes"></activity>
<activity
android:name="izzy.n.calculator"
android:label="#string/calculator"></activity>
<activity android:name="izzy.n.main1"
android:label="#string/app_name"></activity>
</application>
</manifest>
and finally here is the main1.java:
class MyCalendar {
public String name;
public String id;
public MyCalendar(String _name, String _id) {
name = _name;
id = _id;
}
#Override
public String toString() {
return name;
}
}
public class main1 extends Activity {
/*********************************************************************
* UI part*/
private Spinner m_spinner_calender;
private Button m_button_add;
private Button m_button_add2;
private Button m_button_getEvents;
private TextView m_text_event;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
/*get calendar list and populate the view*/
getCalendars();
populateCalendarSpinner();
populateAddBtn();
populateAddBtn2();
populateTextEvent();
populateGetEventsBtn();
}
private void populateCalendarSpinner() {
m_spinner_calender = (Spinner)this.findViewById(R.id.spinner_calendar);
ArrayAdapter l_arrayAdapter = new ArrayAdapter(this.getApplicationContext(), android.R.layout.simple_spinner_item, m_calendars);
l_arrayAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
m_spinner_calender.setAdapter(l_arrayAdapter);
m_spinner_calender.setSelection(0);
m_spinner_calender.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> p_parent, View p_view,
int p_pos, long p_id) {
m_selectedCalendarId = m_calendars[(int)p_id].id;
}
#Override
public void onNothingSelected(AdapterView<?> arg0) {}
});
}
private void populateAddBtn() {
m_button_add = (Button) this.findViewById(R.id.button_add);
m_button_add.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
addEvent();
}
});
}
private void populateAddBtn2() {
m_button_add2 = (Button) this.findViewById(R.id.button_add2);
m_button_add2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
addEvent2();
}
});
}
private void populateGetEventsBtn() {
m_button_getEvents = (Button) findViewById(R.id.button_get_events);
m_button_getEvents.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
getLastThreeEvents();
}
});
}
private void populateTextEvent() {
m_text_event = (TextView) findViewById(R.id.text_event);
String l_str = "title: roman10 calendar tutorial test\n" +
"description: This is a simple test for calendar api\n" +
"eventLocation: #home\n" +
"start time:" + getDateTimeStr(0) + "\n" +
"end time: " + getDateTimeStr(30) + "\n" +
"event status: confirmed\n" +
"all day: no\n" +
"has alarm: yes\n";
m_text_event.setText(l_str);
}
/****************************************************************
* Data part
*/
/*retrieve a list of available calendars*/
private MyCalendar m_calendars[];
private String m_selectedCalendarId = "0";
private void getCalendars() {
String[] l_projection = new String[]{"_id", "displayName"};
Uri l_calendars;
if (Build.VERSION.SDK_INT >= 8) {
l_calendars = Uri.parse("content://com.android.calendar/calendars");
} else {
l_calendars = Uri.parse("content://calendar/calendars");
}
Cursor l_managedCursor = this.managedQuery(l_calendars, l_projection, null, null, null); //all calendars
//Cursor l_managedCursor = this.managedQuery(l_calendars, l_projection, "selected=1", null, null); //active calendars
if (l_managedCursor.moveToFirst()) {
m_calendars = new MyCalendar[l_managedCursor.getCount()];
String l_calName;
String l_calId;
int l_cnt = 0;
int l_nameCol = l_managedCursor.getColumnIndex(l_projection[1]);
int l_idCol = l_managedCursor.getColumnIndex(l_projection[0]);
do {
l_calName = l_managedCursor.getString(l_nameCol);
l_calId = l_managedCursor.getString(l_idCol);
m_calendars[l_cnt] = new MyCalendar(l_calName, l_calId);
++l_cnt;
} while (l_managedCursor.moveToNext());
}
}
/*add an event to calendar*/
private void addEvent() {
ContentValues l_event = new ContentValues();
l_event.put("calendar_id", m_selectedCalendarId);
l_event.put("title", "roman10 calendar tutorial test");
l_event.put("description", "This is a simple test for calendar api");
l_event.put("eventLocation", "#home");
l_event.put("dtstart", System.currentTimeMillis());
l_event.put("dtend", System.currentTimeMillis() + 1800*1000);
l_event.put("allDay", 0);
//status: 0~ tentative; 1~ confirmed; 2~ canceled
l_event.put("eventStatus", 1);
//0~ default; 1~ confidential; 2~ private; 3~ public
l_event.put("visibility", 0);
//0~ opaque, no timing conflict is allowed; 1~ transparency, allow overlap of scheduling
l_event.put("transparency", 0);
//0~ false; 1~ true
l_event.put("hasAlarm", 1);
Uri l_eventUri;
if (Build.VERSION.SDK_INT >= 8) {
l_eventUri = Uri.parse("content://com.android.calendar/events");
} else {
l_eventUri = Uri.parse("content://calendar/events");
}
Uri l_uri = this.getContentResolver().insert(l_eventUri, l_event);
Log.v("++++++test", l_uri.toString());
}
/*add an event through intent, this doesn't require any permission
* just send intent to android calendar
* http://www.openintents.org/en/uris*/
private void addEvent2() {
Intent l_intent = new Intent(Intent.ACTION_EDIT);
l_intent.setType("vnd.android.cursor.item/event");
//l_intent.putExtra("calendar_id", m_selectedCalendarId); //this doesn't work
l_intent.putExtra("title", "roman10 calendar tutorial test");
l_intent.putExtra("description", "This is a simple test for calendar api");
l_intent.putExtra("eventLocation", "#home");
l_intent.putExtra("beginTime", System.currentTimeMillis());
l_intent.putExtra("endTime", System.currentTimeMillis() + 1800*1000);
l_intent.putExtra("allDay", 0);
//status: 0~ tentative; 1~ confirmed; 2~ canceled
l_intent.putExtra("eventStatus", 1);
//0~ default; 1~ confidential; 2~ private; 3~ public
l_intent.putExtra("visibility", 0);
//0~ opaque, no timing conflict is allowed; 1~ transparency, allow overlap of scheduling
l_intent.putExtra("transparency", 0);
//0~ false; 1~ true
l_intent.putExtra("hasAlarm", 1);
try {
startActivity(l_intent);
} catch (Exception e) {
Toast.makeText(this.getApplicationContext(), "Sorry, no compatible calendar is found!", Toast.LENGTH_LONG).show();
}
}
/*get a list of events
* http://jimblackler.net/blog/?p=151*/
private void getLastThreeEvents() {
Uri l_eventUri;
if (Build.VERSION.SDK_INT >= 8) {
l_eventUri = Uri.parse("content://com.android.calendar/events");
} else {
l_eventUri = Uri.parse("content://calendar/events");
}
String[] l_projection = new String[]{"title", "dtstart", "dtend"};
Cursor l_managedCursor = this.managedQuery(l_eventUri, l_projection, "calendar_id=" + m_selectedCalendarId, null, "dtstart DESC, dtend DESC");
//Cursor l_managedCursor = this.managedQuery(l_eventUri, l_projection, null, null, null);
if (l_managedCursor.moveToFirst()) {
int l_cnt = 0;
String l_title;
String l_begin;
String l_end;
StringBuilder l_displayText = new StringBuilder();
int l_colTitle = l_managedCursor.getColumnIndex(l_projection[0]);
int l_colBegin = l_managedCursor.getColumnIndex(l_projection[1]);
int l_colEnd = l_managedCursor.getColumnIndex(l_projection[1]);
do {
l_title = l_managedCursor.getString(l_colTitle);
l_begin = getDateTimeStr(l_managedCursor.getString(l_colBegin));
l_end = getDateTimeStr(l_managedCursor.getString(l_colEnd));
l_displayText.append(l_title + "\n" + l_begin + "\n" + l_end + "\n----------------\n");
++l_cnt;
} while (l_managedCursor.moveToNext() && l_cnt < 3);
m_text_event.setText(l_displayText.toString());
}
}
/************************************************
* utility part
*/
private static final String DATE_TIME_FORMAT = "yyyy MMM dd, HH:mm:ss";
public static String getDateTimeStr(int p_delay_min) {
Calendar cal = Calendar.getInstance();
SimpleDateFormat sdf = new SimpleDateFormat(DATE_TIME_FORMAT);
if (p_delay_min == 0) {
return sdf.format(cal.getTime());
} else {
Date l_time = cal.getTime();
l_time.setMinutes(l_time.getMinutes() + p_delay_min);
return sdf.format(l_time);
}
}
public static String getDateTimeStr(String p_time_in_millis) {
SimpleDateFormat sdf = new SimpleDateFormat(DATE_TIME_FORMAT);
Date l_time = new Date(Long.parseLong(p_time_in_millis));
return sdf.format(l_time);
}
}

If you look at your stack trace, you'll see that the problem is a NullPointerException from here:
at izzy.n.main1.populateCalendarSpinner(main1.java:69)
Something at line 69 in main1 is null, but you are trying to use it. I can't tell which line that is from what you've provided above, so its tough to provide a more specific answer.
Here is my guess. If the cause is from this line:
m_selectedCalendarId = m_calendars[(int)p_id].id;
Then there might not be an element at m_calendars[(int)p_id]. What you might really need is:
m_selectedCalendarId = m_calendars[p_pos].id;
For future reference, the Eclipse Debugger is a great help in situations like this. Here is a tutorial to help you get started with it: http://www.ibm.com/developerworks/library/os-ecbug/

Have you checked if m_calendars is being initialized correctly.
Ensure that the l_arrayAdapter is not null.