We Keep Coding

java.lang.nullpointer error in android

I am making an app which will display the images of celebrities and 4 names out of which one is correct.
I have added a button "change" to change the celebrity in the image, but on pressing that button my app is crashing showing null java.lang.null pointer exception.
I have the the code for loading the image and four names in the oncreate method which loads the image and four names when the app is first started, but on pressing the button when the function is invoked , error is generated although i have that same code in it.
public class MainActivity extends AppCompatActivity {
//declaring all the widgets to be used
Bitmap celebimg;
Random rand;
ImageView img;
Button btn0, btn1, btn2, btn3;
int optionnum, imgnum;
ArrayList<String> celebnames = new ArrayList<String>();
ArrayList<String> celebimages = new ArrayList<String>();
ArrayList<String> buttonoptions = new ArrayList<String>();
//Invoked when one out of the four options is clicked
public void row(View view) {
if (view.getTag().toString().equals(Integer.toString(optionnum))){
Toast.makeText(this, "correct Answer", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(this, "wrong Answer, It was" +
celebnames.get(imgnum), Toast.LENGTH_SHORT).show();
}
}
//Class for downloading of image
public class Imagedownload extends AsyncTask<String, Void, Bitmap> {
#Override
protected Bitmap doInBackground(String... strings) {
try {
URL url = new URL(strings[0]);
HttpURLConnection connection = (HttpURLConnection)url.openConnection();
connection.connect();
InputStream in = connection.getInputStream();
Bitmap myimage = BitmapFactory.decodeStream(in);
return myimage;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}
/**
* Class for downloading the website html code
*/
public class Download extends AsyncTask<String, Void, String > {
#Override
protected String doInBackground(String... strings) {
String result = "";
URL url;
HttpURLConnection connection = null;
try {
url = new URL(strings[0]);
connection = (HttpURLConnection)url.openConnection();
InputStream input = connection.getInputStream();
InputStreamReader reader = new InputStreamReader(input);
int data = reader.read();
while(data != -1) {
char current = (char)data;
result += current;
data = reader.read();
}
return result;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
}
Code to execute when the change button is clicked
public void change(View view) {
rand = new Random();
imgnum = rand.nextInt(celebimages.size());
Imagedownload image = new Imagedownload();
try {
celebimg = image.execute(celebimages.get(imgnum)).get();
if (celebimg == null)
Log.i("its", "null douchebag");
img.setImageBitmap(celebimg);
} catch (InterruptedException e) {
if (celebimg == null)
Log.i("its", "null douchebag");
e.printStackTrace();
} catch (ExecutionException e) {
if (celebimg == null)
Log.i("its", "null douchebag");
e.printStackTrace();
}
optionnum = rand.nextInt(4);
for(int i = 0;i < 4;i++){
if(i == optionnum)
buttonoptions.add(celebnames.get(imgnum));
else {
int random = rand.nextInt(celebnames.size());
while (celebnames.get(imgnum) == celebnames.get(random)){
random = rand.nextInt(celebnames.size());
}
buttonoptions.add(celebnames.get(random));
}
}
btn0.setText(buttonoptions.get(0));
btn1.setText(buttonoptions.get(1));
btn2.setText(buttonoptions.get(2));
btn3.setText(buttonoptions.get(3));
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ImageView img = (ImageView)findViewById(R.id.celeb);
btn0 = (Button)findViewById(R.id.btn0);
btn1 = (Button)findViewById(R.id.btn1);
btn2 = (Button)findViewById(R.id.btn2);
btn3 = (Button)findViewById(R.id.btn3);
String data = "";
Download load = new Download();
try {
data = load.execute("http://www.posh24.se/kandisar").get();
String[] splitdata = data.split("<div class=\"title\">Lista:</div>");
// seperating out the required img src from the html code
Pattern p = Pattern.compile("src=\"(.*?)\"");
Matcher M = p.matcher(splitdata[1]);
while (M.find()){
//adding all the img src values to celebimages arraylist
celebimages.add(M.group(1));
}
Pattern pi = Pattern.compile("alt=\"(.*?)\"");
Matcher Mi = pi.matcher(splitdata[1]);
while (Mi.find()) {
// adding all the alt values to celebnames arraylist
celebnames.add(Mi.group(1));
}
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
Random rand = new Random();
imgnum = rand.nextInt(celebimages.size());
Imagedownload image = new Imagedownload();
Bitmap celebimg;
try {
//downloading the image from stored img src values from celebimages
//arraylist
celebimg = image.execute(celebimages.get(imgnum)).get();
img.setImageBitmap(celebimg);
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
//Setting the correct value in one button and random values in other
//three
optionnum = rand.nextInt(4);
for(int i = 0;i < 4;i++){
if(i == optionnum)
buttonoptions.add(celebnames.get(imgnum));
else {
int random = rand.nextInt(85);
while (celebnames.get(imgnum) == celebnames.get(random)){
random = rand.nextInt(celebnames.size());
}
buttonoptions.add(celebnames.get(random));
}
}
btn0.setText(buttonoptions.get(0));
btn1.setText(buttonoptions.get(1));
btn2.setText(buttonoptions.get(2));
btn3.setText(buttonoptions.get(3));
}
Error:
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ImageView.setImageBitmap(android.graphics.Bitmap)' on a null object reference

The problem is because you're creating another variable for the image instead reusing the previous variable:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ImageView img = (ImageView)findViewById(R.id.celeb);
...
}
it should be
img = (ImageView)findViewById(R.id.celeb);
The problem usually happens because not using a readable naming convention such as the following:
Bitmap celebimg;
Random rand;
ImageView img;
Button btn0, btn1, btn2, btn3;
Use something like this for class scope variables:
Bitmap mBmpCeleb;
Random mRndSomeId;
ImageView mImvCeleb;
Button mBtnImageOne, mBtnImageTwo, mBtnImageThree, mBtnImageThree;
where the m character is an abbreviation of member which is telling that the variable is member of the class.
Use something like the following for a method scope variable:
ImageView imvCeleb = (ImageView) findViewById(R.id.celeb);

E/PdfManipulationService: Cannot open file java.io.IOException: not create document. Error:

hello people i am working on document printing app and first i am create a pdf file using iText lib and then i am connect the printer through ip address this is going well but when i am print(hp printer) the document then i got a error
like error below
E/PdfManipulationService: Cannot open file
java.io.IOException: not create document. Error:
at android.graphics.pdf.PdfRenderer.nativeCreate(Native Method)
at android.graphics.pdf.PdfRenderer.<init>(PdfRenderer.java:153)
at com.android.printspooler.renderer.PdfManipulationService$PdfRendererImpl.openDocument(PdfManipulationService.java:92)
at com.android.printspooler.renderer.IPdfRenderer$Stub.onTransact(IPdfRenderer.java:58)
at android.os.Binder.execTransact(Binder.java:446)
my code is
MainActivity
public class MainActivity extends AppCompatActivity {
private Button scan_Button;
private Handler mHandler;
private String ipAddress = "192.168.1.101";
PrintedPdfDocument mPdfDocument;
private int printItemCount;
private Appendable writtenPagesArray;
private int totalPages = 0;
String FILE;
String fileName = new SimpleDateFormat("yyyyMMdd_hhmmss", Locale.getDefault()).format(new Date());
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
createPdfDocument();
if (android.os.Build.VERSION.SDK_INT > 9) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
}
scan_Button = (Button) findViewById(R.id.scan_Button);
scan_Button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
new MakeConnection().execute();
doPrint();
}
});
}
private void createPdfDocument() {
FILE = Environment.getExternalStorageDirectory().toString()
+ "/PDF/" + fileName+".pdf";
Log.e("FILE", "=====>"+FILE);
// Create New Blank Document
Document document = new Document(PageSize.A4);
// Create Directory in External Storage
String root = Environment.getExternalStorageDirectory().toString();
File myDir = new File(root + "/PDF");
myDir.mkdirs();
Log.e("myDir", "=====>"+myDir);
try {
PdfWriter.getInstance(document, new FileOutputStream(FILE));
// Open Document for Writting into document
document.open();
// User Define Method
addMetaData(document);
addTitlePage(document);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (DocumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// Close Document after writting all content
document.close();
Toast.makeText(this, "PDF File is Created. Location : " + FILE,
Toast.LENGTH_LONG).show();
}
// Set PDF document Properties
public void addMetaData(Document document)
{
document.addTitle("RESUME");
document.addSubject("Person Info");
document.addKeywords("Personal, Education, Skills");
document.addAuthor("TAG");
document.addCreator("TAG");
}
public void addTitlePage(Document document) throws DocumentException {
// Font Style for Document
Font catFont = new Font(Font.FontFamily.TIMES_ROMAN, 18, Font.BOLD);
Font titleFont = new Font(Font.FontFamily.TIMES_ROMAN, 22, Font.BOLD
| Font.UNDERLINE, BaseColor.GRAY);
Font smallBold = new Font(Font.FontFamily.TIMES_ROMAN, 12, Font.BOLD);
Font normal = new Font(Font.FontFamily.TIMES_ROMAN, 12, Font.NORMAL);
// Start New Paragraph
Paragraph prHead = new Paragraph();
// Set Font in this Paragraph
prHead.setFont(titleFont);
// Add item into Paragraph
prHead.add("RESUME – Amit Basliyal\n");
// Create Table into Document with 1 Row
PdfPTable myTable = new PdfPTable(1);
// 100.0f mean width of table is same as Document size
myTable.setWidthPercentage(100.0f);
// Create New Cell into Table
PdfPCell myCell = new PdfPCell(new Paragraph(""));
myCell.setBorder(Rectangle.BOTTOM);
// Add Cell into Table
myTable.addCell(myCell);
prHead.setFont(catFont);
prHead.add("\n testing\n");
prHead.setAlignment(Element.ALIGN_CENTER);
// Add all above details into Document
document.add(prHead);
document.add(myTable);
document.add(myTable);
// Now Start another New Paragraph
Paragraph prPersinalInfo = new Paragraph();
prPersinalInfo.setFont(smallBold);
prPersinalInfo.add("Address 1\n");
prPersinalInfo.add("Address 1\n");
prPersinalInfo.add("City: uuuu State: uuu\n");
prPersinalInfo.add("Country: INDIA Zip Code: 000001\n");
prPersinalInfo
.add("Mobile: 0099999999Fax: 0101020101 Email: text#gmail.com \n");
prPersinalInfo.setAlignment(Element.ALIGN_CENTER);
document.add(prPersinalInfo);
document.add(myTable);
document.add(myTable);
Paragraph prProfile = new Paragraph();
prProfile.setFont(smallBold);
prProfile.add("\n \n Profile : \n ");
prProfile.setFont(normal);
prProfile
.add("\nI am Mr. XYZ. I am Android Application Developer at TAG.");
prProfile.setFont(smallBold);
document.add(prProfile);
// Create new Page in PDF
document.newPage();
}
class MakeConnection extends AsyncTask<String, Void, String> {
String check = "NO";
#Override
protected String doInBackground(String... params) {
Log.e("DoInBackGround", "==>");
try {
Socket sock = new Socket(ipAddress, 9100);
PrintWriter oStream = new PrintWriter(sock.getOutputStream());
oStream.println("HI,test from Android Device");
oStream.println("\n\n\n\f");
oStream.close();
sock.close();
// doPrint();
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(String s) {
Log.e("onPostExecute", "==>");
//Logger.LogError(TAG, check);
Log.e("onPostExecute", "==>" + check);
//doPrint();
super.onPostExecute(s);
}
}
private void doPrint() {
// Get a PrintManager instance
PrintManager printManager = (PrintManager) this.getSystemService(Context.PRINT_SERVICE);
// Set job name, which will be displayed in the print queue
String jobName = this.FILE;
// Preferences.writeString(MainActivity.this,"filename",FILE);
SharedPreferences sharedPreferences = PreferenceManager
.getDefaultSharedPreferences(this);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putString("filename", FILE);
editor.apply();
// Start a print job, passing in a PrintDocumentAdapter implementation
// to handle the generation of a print document
printManager.print(jobName, new MyPrintDocumentAdapter(this),
null);
}
}
MyPrintDocumentAdapter.java
public class MyPrintDocumentAdapter extends PrintDocumentAdapter {
Activity activity;
PrintedPdfDocument mPdfDocument;
//Page[] writtenPagesArray;
public MyPrintDocumentAdapter(Activity activity)
{
this.activity = activity;
}
#Override
public void onLayout(PrintAttributes oldAttributes,
PrintAttributes newAttributes,
CancellationSignal cancellationSignal,
LayoutResultCallback callback, Bundle extras) {
// Create a new PdfDocument with the requested page attributes
mPdfDocument = new PrintedPdfDocument(activity, newAttributes);
// Respond to cancellation request
if (cancellationSignal.isCanceled() ) {
callback.onLayoutCancelled();
return;
}
// Compute the expected number of printed pages
int pages = computePageCount(newAttributes);
// filename =Preferences.readString(context,"filename","");
SharedPreferences sharedPreferences = PreferenceManager
.getDefaultSharedPreferences(activity);
String name = sharedPreferences.getString("filename", "default value");
if (pages > 0) {
// Return print information to print framework
PrintDocumentInfo info = new PrintDocumentInfo
// .Builder("print_output.pdf")
.Builder(name)
.setContentType(PrintDocumentInfo.CONTENT_TYPE_DOCUMENT)
.setPageCount(pages)
.build();
// Content layout reflow is complete
callback.onLayoutFinished(info, true);
} else {
// Otherwise report an error to the print framework
callback.onLayoutFailed("Page count calculation failed.");
}
}
#Override
public void onWrite(PageRange[] pages, ParcelFileDescriptor destination,
CancellationSignal cancellationSignal, WriteResultCallback callback) {
// TODO Auto-generated method stub
// Write PDF document to file
try {
mPdfDocument.writeTo(new FileOutputStream(
destination.getFileDescriptor()));
} catch (IOException e) {
callback.onWriteFailed(e.toString());
return;
} finally {
mPdfDocument.close();
mPdfDocument = null;
}
//PageRange[] writtenPages = computeWrittenPages();
// Signal the print framework the document is complete
callback.onWriteFinished(pages);
}
private int computePageCount(PrintAttributes printAttributes) {
int itemsPerPage = 4; // default item count for portrait mode
MediaSize pageSize = printAttributes.getMediaSize();
if (!pageSize.isPortrait()) {
// Six items per page in landscape orientation
itemsPerPage = 6;
}
// Determine number of print items
int printItemCount = 5; //getPrintItemCount();
return (int) Math.ceil(printItemCount / itemsPerPage);
}
private void drawPage(PdfDocument.Page page) {
Canvas canvas = page.getCanvas();
// units are in points (1/72 of an inch)
int titleBaseLine = 72;
int leftMargin = 54;
Paint paint = new Paint();
paint.setColor(Color.BLACK);
paint.setTextSize(36);
canvas.drawText("Test Title", leftMargin, titleBaseLine, paint);
paint.setTextSize(11);
canvas.drawText("Test paragraph", leftMargin, titleBaseLine + 25, paint);
paint.setColor(Color.BLUE);
canvas.drawRect(100, 100, 172, 172, paint);
}
}
Please help me

For Hp printers you can use Hp-eprint by finding the email address of your
Hp printer and then you can use following code to send mail to your priner.As
You send the mail the attached document gets printed on your Hp Printer.
private void openHpeprint() {
File file = new File(folder + "/" + fileName);
if (file.exists()) {
Intent emailIntent = new Intent();
emailIntent.setAction(Intent.ACTION_SEND);
/* Uri uri = Uri.fromFile(file);*/
Uri uri = FileProvider.getUriForFile(mContext, mContext.getApplicationContext().getPackageName() + ".provider", file);
emailIntent.setFlags(FLAG_GRANT_WRITE_URI_PERMISSION);
emailIntent.setFlags(FLAG_GRANT_READ_URI_PERMISSION);
// set the type to 'email'
emailIntent.setType("vnd.android.cursor.dir/email");
emailIntent.setPackage("com.google.android.gm");
String to[] = {"yourHpprinteremailaddress#Hpeprint.com"};
emailIntent.putExtra(Intent.EXTRA_EMAIL, to);
// the attachment
emailIntent.putExtra(Intent.EXTRA_STREAM, uri);
// the mail subject
emailIntent.putExtra(Intent.EXTRA_SUBJECT, "Subject");
try {
startActivity(emailIntent);
} catch (ActivityNotFoundException e) {
Logger.LogError(TAG, "No Application Available to View Pdf");
}
}
}

Screenshot Black in Android

I've been working out how to take a screenshot programmatically in android, however when it screenshots I get a toolbar and black screen captured instead of what is actually on the screen.
I've also tried to screenshot a particular TextView within the custom InfoWindow layout I created for the google map. But that creates a null pointer exception on the second line below.
TextView v1 = (TextView)findViewById(R.id.tv_code);
v1.setDrawingCacheEnabled(true);
Is there anyway to either actually screenshot what is on the screen without installing android screenshot library or to screenshot a TextView within a custom InfoWindow layout
This is my screenshot method:
/**
* Method to take a screenshot programmatically
*/
private void takeScreenshot(){
try {
//TextView I could screenshot instead of the whole screen:
//TextView v1 = (TextView)findViewById(R.id.tv_code);
View v1 = getWindow().getDecorView().getRootView();
v1.setDrawingCacheEnabled(true);
Bitmap bitmap = Bitmap.createBitmap(v1.getDrawingCache());
v1.setDrawingCacheEnabled(false);
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 40, bytes);
File f = new File(Environment.getExternalStorageDirectory()
+ File.separator + "test.jpg");
FileOutputStream fo = new FileOutputStream(f);
fo.write(bytes.toByteArray());
fo.flush();
fo.close();
MediaStore.Images.Media.insertImage(getContentResolver(), f.getAbsolutePath(), f.getName(), f.getName());
Log.d("debug", "Screenshot saved to gallery");
Toast.makeText(HuntActivity.this,"Code Saved!",Toast.LENGTH_LONG).show();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
EDIT: I have changed the method to the one provided from the source
How can i take/merge screen shot of Google map v2 and layout of xml both programmatically?
However it does not screenshot anything.
public void captureMapScreen() {
GoogleMap.SnapshotReadyCallback callback = new GoogleMap.SnapshotReadyCallback() {
#Override
public void onSnapshotReady(Bitmap snapshot) {
try {
View mView = getWindow().getDecorView().getRootView();
mView.setDrawingCacheEnabled(true);
Bitmap backBitmap = mView.getDrawingCache();
Bitmap bmOverlay = Bitmap.createBitmap(
backBitmap.getWidth(), backBitmap.getHeight(),
backBitmap.getConfig());
Canvas canvas = new Canvas(bmOverlay);
canvas.drawBitmap(backBitmap, 0, 0, null);
canvas.drawBitmap(snapshot, new Matrix(), null);
FileOutputStream out = new FileOutputStream(
Environment.getExternalStorageDirectory()
+ "/"
+ System.currentTimeMillis() + ".jpg");
bmOverlay.compress(Bitmap.CompressFormat.JPEG, 90, out);
} catch (Exception e) {
e.printStackTrace();
}
}
};
mMap.snapshot(callback);
}

Use this code
private void takeScreenshot() {
AsyncTask<Void, Void, Void> asyc = new AsyncTask<Void, Void, Void>() {
#Override
protected void onPreExecute() {
super.onPreExecute();
objUsefullData.showProgress("Please wait", "");
}
#Override
protected Void doInBackground(Void... params) {
try {
// create bitmap screen capture
View v1 = getWindow().getDecorView().getRootView();
v1.setDrawingCacheEnabled(true);
bitmapscreen_shot = Bitmap.createBitmap(v1
.getDrawingCache());
v1.setDrawingCacheEnabled(false);
String state = Environment.getExternalStorageState();
File folder = null;
if (state.contains(Environment.MEDIA_MOUNTED)) {
folder = new File(
Environment.getExternalStorageDirectory()
+ "/piccapella");
} else {
folder = new File(
Environment.getExternalStorageDirectory()
+ "/piccapella");
}
boolean success = true;
if (!folder.exists()) {
success = folder.mkdirs();
}
if (success) {
// Create a media file name
String timeStamp = new SimpleDateFormat(
"yyyyMMdd_HHmmss", Locale.getDefault())
.format(new java.util.Date());
imageFile = new File(folder.getAbsolutePath()
+ File.separator + "IMG_" + timeStamp + ".jpg");
/*
* Toast.makeText(AddTextActivity.this,
* "saved Image path" + "" + imageFile,
* Toast.LENGTH_SHORT) .show();
*/
imageFile.createNewFile();
} else {
/*
* Toast.makeText(AddTextActivity.this,
* "Image Not saved", Toast.LENGTH_SHORT).show();
*/
}
ByteArrayOutputStream ostream = new ByteArrayOutputStream();
// save image into gallery
bitmapscreen_shot.compress(CompressFormat.JPEG, 100,
ostream);
FileOutputStream fout = new FileOutputStream(imageFile);
fout.write(ostream.toByteArray());
fout.close();
Log.e("image_screen_shot", "" + imageFile);
} catch (Throwable e) {
// Several error may come out with file handling or OOM
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
objUsefullData.dismissProgress();
}
};
asyc.execute();
}
Hope this will help you

I have figured it out !
/**
* Method to take a screenshot programmatically
*/
private void takeScreenshot(){
GoogleMap.SnapshotReadyCallback callback = new GoogleMap.SnapshotReadyCallback() {
#Override
public void onSnapshotReady(Bitmap bitmap) {
Bitmap b = bitmap;
String timeStamp = new SimpleDateFormat(
"yyyyMMdd_HHmmss", Locale.getDefault())
.format(new java.util.Date());
String filepath = timeStamp + ".jpg";
try{
OutputStream fout = null;
fout = openFileOutput(filepath,MODE_WORLD_READABLE);
bitmap.compress(Bitmap.CompressFormat.JPEG, 90, fout);
fout.flush();
fout.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
saveImage(filepath);
}
};
mMap.snapshot(callback);
}
/**
* Method to save the screenshot image
* #param filePath the file path
*/
public void saveImage(String filePath)
{
File file = this.getFileStreamPath(filePath);
if(!filePath.equals(""))
{
final ContentValues values = new ContentValues(2);
values.put(MediaStore.Images.Media.MIME_TYPE, "image/jpeg");
values.put(MediaStore.Images.Media.DATA, file.getAbsolutePath());
final Uri contentUriFile = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
Toast.makeText(HuntActivity.this,"Code Saved to files!",Toast.LENGTH_LONG).show();
}
else
{
System.out.println("ERROR");
}
}
I have adapted the code from this link so it doesn't share and instead just saves the image.
Capture screen shot of GoogleMap Android API V2
Thanks for everyones help

Please try with the code below:
private void takeScreenshot(){
try {
//TextView I could screenshot instead of the whole screen:
//TextView v1 = (TextView)findViewById(R.id.tv_code);
Bitmap bitmap = null;
Bitmap bitmap1 = null;
View v1 = getWindow().getDecorView().getRootView();
v1.setDrawingCacheEnabled(true);
bitmap = Bitmap.createBitmap(v1.getDrawingCache());
try {
if (bitmap != null)
bitmap1 = Bitmap.createBitmap(bitmap, 0, 0,
v1.getWidth(), v1.getHeight());
} catch (OutOfMemoryError e) {
e.printStackTrace();
}
v1.setDrawingCacheEnabled(false);
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
bitmap1.compress(Bitmap.CompressFormat.JPEG, 40, bytes);
File f = new File(Environment.getExternalStorageDirectory()
+ File.separator + "test.jpg");
FileOutputStream fo = new FileOutputStream(f);
fo.write(bytes.toByteArray());
fo.flush();
fo.close();
MediaStore.Images.Media.insertImage(getContentResolver(), f.getAbsolutePath(), f.getName(), f.getName());
Log.d("debug", "Screenshot saved to gallery");
Toast.makeText(HuntActivity.this,"Code Saved!",Toast.LENGTH_LONG).show();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}

I faced this issue. After v1.setDrawingCacheEnabled(true); I added,
v1.buildDrawingCache();
And put some delay to call the takeScreenshot(); method.
It is fixed.

Java: Can't convert string to array

I can't convert a string to an array!
String text = "";
String[] textsplit = {};
//Stuff
The app set the content of an online txt file in a string:
The online txt file contain: hello,my,name,is,simone
[...] //Downloading code
text = bo.toString(); //Set the content of the online file to the string
Now the string text is like this:
text = "hello,my,name,is,simone"
Now i have to convert the string to an array that must be like this:
textsplit = {"hello","my","name","is","simone"}
so the code that i use is:
textsplit = text.split(",");
But when i try to use the array the app crash! :(
For example:
textview.setText(textsplit[0]); //The text of the textview is empity
textview.setText(textsplit[1]); //The app crash
textview.setText(textsplit[2]); //The app crash
etc...
where am I wrong? thanks!
EDIT: This is the code:
new Thread() {
#Override
public void run() {
String path ="http://www.luconisimone.altervista.org/ciao.txt";
URL u = null;
try {
u = new URL(path);
HttpURLConnection c = (HttpURLConnection) u.openConnection();
c.setRequestMethod("GET");
c.connect();
InputStream in = c.getInputStream();
final ByteArrayOutputStream bo = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
in.read(buffer); // Read from Buffer.
bo.write(buffer); // Write Into Buffer.
runOnUiThread(new Runnable() {
#Override
public void run() {
text = bo.toString();
testo.setText("(" + text + ")");
try {
bo.close();
} catch (IOException e) {
e.printStackTrace();
}
}
});
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (ProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}.start();
// Here all variables became empity
textsplit = text.split(",");
datisplittati.setText(textsplit[0]);

Try :
String text = "hello,my,name,is,simone";
String[] textArr = text.split(Pattern.quote(","));

You can get string using AsyncTask
private class GetStringFromUrl extends AsyncTask<String, Void, String> {
ProgressDialog dialog ;
#Override
protected void onPreExecute() {
super.onPreExecute();
// show progress dialog when downloading
dialog = ProgressDialog.show(MainActivity.this, null, "Downloading...");
}
#Override
protected String doInBackground(String... params) {
// #BadSkillz codes with same changes
try {
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(params[0]);
HttpResponse response = httpClient.execute(httpGet);
HttpEntity entity = response.getEntity();
BufferedHttpEntity buf = new BufferedHttpEntity(entity);
InputStream is = buf.getContent();
BufferedReader r = new BufferedReader(new InputStreamReader(is));
StringBuilder total = new StringBuilder();
String line;
while ((line = r.readLine()) != null) {
total.append(line + "\n");
}
String result = total.toString();
Log.i("Get URL", "Downloaded string: " + result);
return result;
} catch (Exception e) {
Log.e("Get Url", "Error in downloading: " + e.toString());
}
return null;
}
#Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
// TODO change text view id for yourself
TextView textView = (TextView) findViewById(R.id.textView1);
// show result in textView
if (result == null) {
textView.setText("Error in downloading. Please try again.");
} else {
textView.setText(result);
}
// close progresses dialog
dialog.dismiss();
}
}
and use blow line every time that you want:
new GetStringFromUrl().execute("http://www.luconisimone.altervista.org/ciao.txt");

You're using new thread to get data from an url. So in runtime, data will be asynchronous.
So when you access text variable (split it), it's still not get full value (example reason: network delay).
Try to move the function split after text = bo.toString(); , I think it will work well.

Android - InputStream not working correctly

I'm trying to figure out why my inputstream isn't working correctly. I am trying to connect to a server and get a JSON string and save it into the variable inputJSON. However inputJOSN is empty because my inputstream isn't working correctly. This line of code:
inputJSON = ConvertByteArrayToString(getBytesFromInputStream(inputStr));
doesn't seem to be working properly and I'm not sure why?
public class AndroidClient extends ProfileActivity {
private TextView textIn;
public Thread rt;
public Socket socket = null;
public PrintWriter outputstrwr;
public OutputStream out = null;
public DataOutputStream dataOutputStream = null;
public DataInputStream dataInputStream = null;
public InputStream inputStr = null;
private final static String LOG_TAG = AndroidClient.class.getSimpleName();
private final Handler handler = new Handler();
private List<Profile> serviceInfoList = new ArrayList<Profile>();
// Map between list position and profile
private Map<Integer, Profile> posMap = new HashMap<Integer, Profile>();
private Map<String, Integer> addressMap = new HashMap<String, Integer>();
private static String profilePicBase64Str="";
private String inputJSON = "";
private String outputJSON = "";
private String outputJSONserv = "";
private Profile p;
//String urlInputStream = "";
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Log.e(LOG_TAG, "Before OnCreate() Try");
try {
Log.e(LOG_TAG, "In OnCreate() Try");
socket = new Socket("23.23.175.213", 9000); //Port 1337
Log.e(LOG_TAG, "Created Socket");
dataOutputStream = new DataOutputStream(socket.getOutputStream());
Log.e(LOG_TAG, "Created DataOutputStream");
dataInputStream = new DataInputStream(socket.getInputStream());
Log.e(LOG_TAG, "Created DataInputStream");
//out = new OutputStream();
out = socket.getOutputStream();
inputStr = socket.getInputStream();
//Thread readjsonthrd = new Thread(new ReadJSONThread());
//inputstrrd = new InputStreamReader(socket.getInputStream());
p = new Profile();
Log.e(LOG_TAG, "Created Profile Instance");
//Gets the local profile via JSON and converts into Profile type
Gson gson = new Gson();
Log.e(LOG_TAG, "Created Gson Instance" + "GetProfileJSONStr:" + p.getProfileJSONStr());
p = gson.fromJson(p.getProfileJSONStr(), Profile.class);
setProfile(p);
Log.e(LOG_TAG, "Converted Profile to JSON");
//Gson gson = new Gson();
Log.e(LOG_TAG, "Before: outputJSON = gson.toJson(p);");
outputJSON = gson.toJson(p).toString();
outputJSON = removeExcessStr(outputJSON);
Log.e(LOG_TAG, "ProfilePicStr Base64:"+p.getProfilePicStr());
outputJSON = outputJSON.replace("Name","name");
outputJSON = outputJSON.replace("TagLine","message");
outputJSON = outputJSON.replace("Title","title");
outputJSON = outputJSON.replace("Company", "company");
outputJSON = outputJSON.replace("Industry","industry");
outputJSON = outputJSON.replace("WhatIDo","whatido");
outputJSON = outputJSON.replace("WhoDoIWantToMeet","meetwho");
outputJSON = outputJSON.replace("WHOOZNEAR_PROFILEPIC","photo");
outputJSON = outputJSON.replaceAll("[c][o][n][t][e][n][t][:][/][/][a-zA-Z0-9]+[/][a-zA-Z0-9]+[/][a-zA-Z0-9]+[/][a-zA-Z0-9]+[/][a-zA-Z0-9]+", getPicBase64Str()); /*"helloworld2"*/
if (!outputJSON.contains(",\"photo\":")) {
outputJSON = outputJSON.replace("}",",\"photo\":"+"\"IconnexUs\"}");
outputJSON = outputJSON.replace("}",",\"photo\":"+"\""+getPicBase64Str()+"\"}");
outputJSON = outputJSON.replace("}",",\"status\":\"enabled\"}");
}
else {
outputJSON = outputJSON.replace("}",",\"status\":\"enabled\"");
}
outputJSONserv = "{\"to\":\"broadcast\",\"type\":\"1\",\"payload\":"+outputJSON+"}";
Log.e(LOG_TAG, "Created outputJSON:" + outputJSON);
Log.e(LOG_TAG, "Created outputJSON Server:" + outputJSONserv);
JSONObject outObject = new JSONObject();
try {
outObject.put("photo", "hello");
outObject.put("type", "50");
outObject.put("payload", outputJSON);
outputJSON = gson.toJson(outObject).toString();
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Log.e(LOG_TAG, "Value of PROFILEPIC STRING FROM PROFILEMAP: "+profileMap.get("WHOOZNEAR_PROFILEPIC"));
p.setProfilePicStr(ConvertandSetImagetoBase64(profileMap.get("WHOOZNEAR_PROFILEPIC")));
//String headerJSON = gson.toJson(outObject).toString();
outputJSON = outputJSON.substring(nthOccurrence(outputJSON, '{', 2)-1, nthOccurrence(outputJSON, '}', 1)-1);
String input = "["+"Ryan"+"[";
//"[foo".replaceAll(Pattern.quote("["), "\"");
String result = input.replaceAll(Pattern.quote("["), "\"");
Log.e(LOG_TAG, "REGEX REPLACEALL:"+result);
outputstrwr = new PrintWriter(new OutputStreamWriter(socket.getOutputStream()), true);
outputstrwr.write(outputJSONserv);
Log.e(LOG_TAG, "Base64 String:"+p.getProfilePicStr());
Log.e(LOG_TAG, "Sent dataOutputStream");
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Log.e(LOG_TAG, "Before initEventHandlers");
initEventHandlers();
Log.e(LOG_TAG, "After initEventHandlers");
//refreshViewModels();
Log.e(LOG_TAG, "Start Repeat Thread");
rt = new Thread(new RepeatingThread());
rt.start();
Log.e(LOG_TAG, "Started Repeat Thread");
}
#Override
public void onDestroy() {
super.onDestroy();
rt.stop();
try {
socket.close();
dataOutputStream.close();
dataInputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
#Override
public void onPause(){
super.onPause();
rt.stop();
}
#Override
public void onResume(){
super.onResume();
if (rt.isAlive() == false) {
//rt.start();
}
}
#Override
public void onStop(){
super.onStop();
rt.stop();
try {
socket.close();
dataOutputStream.close();
dataInputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static String removeExcessStr(String json_excess) {
//String myString = myString.replace("=\"ppshein\"", "");
String json_excess1 = json_excess.replace("\"nameValues\":{", "");
String myString = json_excess1.replace(",\"profileId\":1,\"valid\":false}", "");
return myString;
}
public static String adddblquotattr(String attr) {
String result = attr.replaceAll(Pattern.quote("["), "\"");
return result;
}
public static String adddblquotval(String val) {
String result = val.replaceAll(Pattern.quote("["), "\"");
return result;
}
public static int nthOccurrence(String str, char c, int n) {
int pos = str.indexOf(c, 0);
while (n-- > 0 && pos != -1)
pos = str.indexOf(c, pos+1);
return pos;
}
public void setPicBase64Str(String profilePicBase64Str) {
this.profilePicBase64Str = profilePicBase64Str;
}
public String getPicBase64Str() {
return profilePicBase64Str;
}
public String ConvertandSetImagetoBase64(String imagePath) {
String base64 = null;
byte[] input = null;
try{
FileInputStream fd = new FileInputStream(imagePath);
Bitmap bmt = BitmapFactory.decodeFileDescriptor(fd.getFD());
try{
ByteArrayOutputStream stream = new ByteArrayOutputStream();
Bitmap tmp = ProfileActivity.scaleDownBitmap(bmt, 10, this);
tmp.compress(Bitmap.CompressFormat.JPEG, 10, stream);
input = stream.toByteArray();
base64 = Base64.encodeToString(input, Base64.DEFAULT);
//LocalProfileActivity.input = input;
}catch(Exception e){
Log.e(LOG_TAG,"[ONACTIVITYRESULT] Could not bind input to the bytearray: " + e.getMessage());
}
}
catch (Exception e){
Log.e("LocalProfile", "ConvertandSetImagetoBase64: Could not load selected profile image");
}
return base64;
}
public String getStringFromBuffer(InputStreamReader inputstrread){
BufferedReader bRead = new BufferedReader(inputstrread);
String line = null;
StringBuffer jsonText = new StringBuffer();
try {
while((line=bRead.readLine())!=null){
jsonText.append(line);
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return jsonText.toString();
}
public String ConvertByteArrayToString(byte[] b) {
// byte[] to string
String input = new String(b);
return input;
}
public byte[] ConvertStringToByteArray(String str) {
// string to byte[]
byte[] bytes = str.getBytes();
return bytes;
}
public static byte[] getBytesFromInputStream(InputStream is)
throws IOException {
// Get the size of the file
long length = is.available();
if (length > Integer.MAX_VALUE) {
// File is too large
}
// Create the byte array to hold the data
byte[] bytes = new byte[(int) length];
// Read in the bytes
int offset = 0;
int numRead = 0;
while (offset < bytes.length
&& (numRead = is.read(bytes, offset, bytes.length - offset)) >= 0) {
offset += numRead;
}
// Ensure all the bytes have been read in
if (offset < bytes.length) {
throw new IOException("Could not completely stream ");
}
// Close the input stream and return bytes
is.close();
return bytes;
}
public static String writeFile(Bitmap finalBitmap) {
String filePath = "";
String root = Environment.getExternalStorageDirectory().toString();
File myDir = new File(root + "/saved_images");
myDir.mkdirs();
Random generator = new Random();
int n = 10000;
n = generator.nextInt(n);
String fname = "Image-"+ n +".jpg";
File file = new File (myDir, fname);
if (file.exists ()) file.delete ();
try {
FileOutputStream outFile = new FileOutputStream(file);
finalBitmap.compress(Bitmap.CompressFormat.JPEG, 90, outFile);
outFile.flush();
outFile.close();
} catch (Exception e) {
e.printStackTrace();
}
filePath = root+"/saved_images/"+fname;
return filePath;
}
public class RepeatingThread implements Runnable {
private final Handler mHandler = new Handler();
private int len = 0;
private byte[] input = new byte[len];
public RepeatingThread() {
//try {
Log.e(LOG_TAG, "Before inputJSON String");
//inputJSON = dataInputStream.readUTF();
//URL url = new URL("tcp://23.23.175.213:1337");
//inputJSON = dataInputStream.readUTF();
//inputstrrd = new InputStreamReader(socket.getInputStream());
String hello = "hello world";
//String inputJSON = getStringFromBuffer(new InputStreamReader(socket.getInputStream()));
//Convert
Log.e(LOG_TAG, "After inputJSON String:" + inputJSON);
/*}
catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}*/
//LOOK HERE FIRST
//inputJSON is what is received back from the server - Take the inputJSON
//String and use regular expressions HERE to remove all the other characters in the
//string except the payload JSON.
//refreshViewModels(inputJSON);
}
#Override
public void run() {
try {
//outputstrwr.write(outputJSONserv); //UNCOMMENT IF NEED TO SEND DATA TO GET JSON BACK
inputJSON = ConvertByteArrayToString(getBytesFromInputStream(inputStr));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Log.e(LOG_TAG, "IN REPEATINGTHREAD-INPUTJSON:" + inputJSON);
refreshViewModels(inputJSON);
mHandler.postDelayed(this, 3000);
}
}
public void refreshViewModels(String inputJSON) {
try {
ListView servicesListView = (ListView) this
.findViewById(R.id.profilesListView);
String[] from = new String[] { "profilePic", "neighborName",
"tagLine" };
int[] to = new int[] { R.id.avatar, R.id.username, R.id.email };
// prepare the list of all records
List<HashMap<String, Object>> fillMaps = new ArrayList<HashMap<String, Object>>();
List<Profile> profiles = new ArrayList<Profile>();
// Clear the position mapping list and reset it
this.posMap.clear();
Log.i(LOG_TAG, "NEW inputJSON: " + inputJSON);
inputJSON = getPayloadStr(inputJSON);
Log.i(LOG_TAG, "NEW inputJSON2: " + inputJSON);
JSONArray profileArray = new JSONArray(inputJSON);
for (int i=0; i<profileArray.length(); i++) {
JSONObject jsonObject = profileArray.getJSONObject(i);
Gson gson = new Gson();
Profile p = gson.fromJson(gson.toJson(jsonObject).toString(), Profile.class);
profiles.add(p);
}
int pos = 0;
// Creates the fillMaps list for the listAdapter
Log.i(LOG_TAG, "Profiles size: " + profiles.size());
//showToast("Profiles size: " + profiles.size());
for (Profile p : profiles) {
// Create mapping for list adapter
HashMap<String, Object> map = new HashMap<String, Object>();
map.put("profilePic",
p.getAttributeValue("photo")== null? "Not Set" : p
.getAttributeValue("photo"));
map.put("neighborName",
p.getAttributeValue("Name") == null? "Not Set" : p
.getAttributeValue("Name"));
map.put("tagLine",
p.getAttributeValue("TagLine") == null? "Not Set" : p
.getAttributeValue("TagLine"));
fillMaps.add(map);
// Reset the postion mapping
this.posMap.put(pos++, p);
}
ListAdapter servicesListAdapter = new myAdapter(this, fillMaps,
R.layout.listitem, from, to);
servicesListView.setAdapter(servicesListAdapter);
} catch (Exception e) {
Log.e(LOG_TAG, "Error making list adapter: " + e.getMessage());
}
}
public String getPayloadStr(String profileString) {
Log.e("LOG_TAG", "Profile Str:"+profileString);
Pattern pattern = Pattern.compile(".*?payload\":(.*)\\}");
Log.e("LOG_TAG", "I got here 1");
Matcher matcher = pattern.matcher(profileString);
Log.e("LOG_TAG", "I got here 12");
//Matcher m = responseCodePattern.matcher(firstHeader);
matcher.matches();
matcher.groupCount();
//matcher.group(0);
Log.e("LOG_TAG", "I got here 2"+matcher.group(1));
return matcher.group(1);
}
private class myAdapter extends SimpleAdapter {
public myAdapter(Context context, List<? extends Map<String, ?>> data,
int resource, String[] from, int[] to) {
super(context, data, resource, from, to);
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = getLayoutInflater().inflate(R.layout.listitem,
null);
}
HashMap<String, Object> data = (HashMap<String, Object>) getItem(position);
((TextView) convertView.findViewById(R.id.username))
.setText((String) data.get("neighborName"));
((TextView) convertView.findViewById(R.id.email))
.setText((String) data.get("tagLine"));
// Convert a string representing an image back to an image
String base64 = ((String)data.get("profilePic"));
byte[] picBytes = Base64.decode(base64, Base64.DEFAULT);
Bitmap bitmap = BitmapFactory.decodeByteArray(picBytes, 0, picBytes.length);
//THE IF AND THE ELSE NEED TO BE SWITCHED
if (bitmap==null){
((ImageView) convertView.findViewById(R.id.avatar)).setImageResource(R.drawable.btn_whooznear);
}else{
((ImageView) convertView.findViewById(R.id.avatar)).setImageBitmap(bitmap);
}
return convertView;
}
}
public void callProfileActivity(int position)
{
// Catch the case when service info is empty
if(serviceInfoList.size()==0){
return;
}
Profile profClick = posMap.get(position);
String b64Str = profClick.getAttributeValue("photo");
Intent startViewActivity = new Intent();
startViewActivity.putExtra("TransProfile", (Profile)posMap.get(position));
startViewActivity.putExtra("PhotoBase64", b64Str);
if(serviceInfoList.size()>position){
//DO SOMETHING HERE
}else{
Log.e(LOG_TAG,"Profile doesn't exist in sevice infoList? Selecting first one");
}
startViewActivity.setClass(this, ViewProfileActivity.class);
startActivity(startViewActivity);
}
/**
* Initialize the event handlers
*/
public void initEventHandlers() {
// Service List View
ListView servicesListView = (ListView) this
.findViewById(R.id.profilesListView);
servicesListView
.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> arg0, View v,
int position, long id) {
Profile clickedProfile = posMap.get(position);
//showToast("Clicked Pos: " + position);
/*Intent intent = new Intent(ConnectActivity.this, ViewProfileActivity.class);
intent.putExtra("ClickProfile", posMap.get(position));*/
callProfileActivity(position);
}
});
}
/*#Override
public void onBackPressed() { // do something on back.
super.onBackPressed();
Intent myIntent = new Intent(AndroidClient.this, ProfileActivity.class);
startActivity(myIntent);
return;
}*/
}

Your code is rather long, so I cannot be sure of what exactly is the problem, but there is definitely an issue here:
public static byte[] getBytesFromInputStream(InputStream is)
throws IOException {
// Get the size of the file
long length = is.available();
If you are calling this right after sending your URL request, the server may not have had time to send the result back, so is.available() may return zero or another value less than the actual number of bytes you would hope would be available. Try code like this for reading in the file.