I've looked all similar questions and none of the solutions presented did solve my problem.
When my application is launcher I am presented with the following:
12-23 19:27:39.207: E/Trace(1884): error opening trace file: No such file or directory (2)
12-23 19:27:39.217: D/AndroidRuntime(1884): Shutting down VM
12-23 19:27:39.217: W/dalvikvm(1884): threadid=1: thread exiting with uncaught exception (group=0x416ae300)
12-23 19:27:39.217: E/AndroidRuntime(1884): FATAL EXCEPTION: main
12-23 19:27:39.217: E/AndroidRuntime(1884): java.lang.RuntimeException: Unable to instantiate application com.triandria.socialgeek.SocialGeek: java.lang.ClassNotFoundException: com.triandria.socialgeek.SocialGeek
12-23 19:27:39.217: E/AndroidRuntime(1884): at android.app.LoadedApk.makeApplication(LoadedApk.java:501)
12-23 19:27:39.217: E/AndroidRuntime(1884): at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4124)
12-23 19:27:39.217: E/AndroidRuntime(1884): at android.app.ActivityThread.access$1300(ActivityThread.java:130)
12-23 19:27:39.217: E/AndroidRuntime(1884): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1255)
12-23 19:27:39.217: E/AndroidRuntime(1884): at android.os.Handler.dispatchMessage(Handler.java:99)
12-23 19:27:39.217: E/AndroidRuntime(1884): at android.os.Looper.loop(Looper.java:137)
12-23 19:27:39.217: E/AndroidRuntime(1884): at android.app.ActivityThread.main(ActivityThread.java:4745)
12-23 19:27:39.217: E/AndroidRuntime(1884): at java.lang.reflect.Method.invokeNative(Native Method)
12-23 19:27:39.217: E/AndroidRuntime(1884): at java.lang.reflect.Method.invoke(Method.java:511)
12-23 19:27:39.217: E/AndroidRuntime(1884): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
12-23 19:27:39.217: E/AndroidRuntime(1884): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
12-23 19:27:39.217: E/AndroidRuntime(1884): at dalvik.system.NativeStart.main(Native Method)
12-23 19:27:39.217: E/AndroidRuntime(1884): Caused by: java.lang.ClassNotFoundException: com.triandria.socialgeek.SocialGeek
12-23 19:27:39.217: E/AndroidRuntime(1884): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
12-23 19:27:39.217: E/AndroidRuntime(1884): at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
12-23 19:27:39.217: E/AndroidRuntime(1884): at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
12-23 19:27:39.217: E/AndroidRuntime(1884): at android.app.Instrumentation.newApplication(Instrumentation.java:967)
12-23 19:27:39.217: E/AndroidRuntime(1884): at android.app.LoadedApk.makeApplication(LoadedApk.java:496)
12-23 19:27:39.217: E/AndroidRuntime(1884): ... 11 more
My class that extends Application
public class SocialGeek extends Application {
private static final String TAG = "Social Geek";
private static Context context;
public static SharedPreferences sharedPreferences;
private static SQLiteDatabase savedProfilesDatabase;
private static DatabaseHelper savedProfilesDatabaseHelper;
private static int width, height;
private static boolean REMOTE_PROFILE_CREATED = false;
private static Location CURRENT_USER_LOCATION;
#Override
public void onCreate() {
super.onCreate();
SocialGeek.context = getApplicationContext();
sharedPreferences = getSharedPreferences(Activity_my_profile.FILENAME,
MODE_PRIVATE);
calculateScreenDimensions();
//TODO if no memory card is present we get errors
savedProfilesDatabaseHelper = new DatabaseHelper(context);
ContentValues contentValues = new ContentValues();
contentValues.put(
SavedProfilesDatabaseScheme.SavedProfilesTable.PROFILE_NAME,
"Dobrovnik");
contentValues
.put(SavedProfilesDatabaseScheme.SavedProfilesTable.PROFILE_DESCRIPTION,
" Stolischnaya University");
savedProfilesDatabase = savedProfilesDatabaseHelper
.getWritableDatabase();// only for mock data
// int rowsDeleted =
// savedProfilesDatabase.delete(SavedProfilesTable.TABLE_NAME, null,
// null);// duplicate values? mock
// Log.d(TAG, "Rows deleted: "+rowsDeleted);
Long newRowId = savedProfilesDatabase.insert(
SavedProfilesTable.TABLE_NAME, null, contentValues);
Log.d(TAG, ("Inserted row: " + newRowId.toString()));
savedProfilesDatabase.close();
}
`
UPDATE: Seems like the problem is not in the libraries or any particular class, even if I remove the SocialGeek extends Application I got the same exception in my MainActivity. I removed all my dependencies, deleted even eclipse and re-installed but the problem remains...
Do you have package com.triandria.socialgeek; on the first line in java file?
Took me a while to figure this out.
I had to right click the project -> build path-> configure build path -> Source tab
and un-tick the Allow output folders for source folders.
Related
I am about to freaking blow my brains out if I don't get this and I have no idea what is wrong. I am just trying to get the result from a query into a database file called Test that I made from SQLiteDatabase Browser.
I have MyDB class and my MainActivity class which just has a button and a textView (all this is for testing the query so it can be put into my app later). I'am trying to make it so that when you push that button it does the rawQuery in the MyDB class and then displays it on the textView. I will have the names for the rows match up with buttons in the app and will then be inserted in the raw query (SQL style) so that It will chose the proper result story based on the other columns.
I have tried this same hard coded query in queryMethodWithout() in my SQL Browser and it works just fine.
The logCat is giving me
IllegalStateException: could not execute method of the Activity
Caused by: java.lang.reflect.InvocationTargetException
Caused by: java.lang.NullPointerException
With this query I have everything hard coded to specific columns and a speific table just to make sure it all works but It won't print out into the text view, can someone please help?!
I know this is selfish but I am dying right meow!
Cursor from the MyDB class:
package com.example.dbquerytester;
import com.readystatesoftware.sqliteasset.SQLiteAssetHelper;
public class MyDB extends SQLiteAssetHelper{
public static final String DATABASE_NAME = "Test.db";
public static final int DATABASE_VERSION = 1;
Context context;
public MyDB(Context applicationContext) {
super(applicationContext, DATABASE_NAME, null, DATABASE_VERSION);
this.context = applicationContext;
}
public Cursor queryMethodWithout(){
SQLiteDatabase database = this.getReadableDatabase();
String storyQueryWithout1 = "SELECT story FROM Christian WHERE Target = 'Immediate' AND Target2 = 'Mother' AND Variable = 'Courage'";
Cursor cursor = database.rawQuery(storyQueryWithout, null);
return cursor;
}
And here's my MainActivity (The onClickQuery() method is the one that is called when the button is pressed):
public class Main_Activity extends Activity {
MyDB myDB;
private Cursor cursorQuery;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void displayMessage(String s){
TextView textView = (TextView) findViewById(R.id.textView1);
textView.setText(s);
}
public void openDB() throws SQLiteException{
myDB = new MyDB(this);
myDB.getReadableDatabase();
}
public void onClickQuery(View view){
openDB();
cursorQuery = myDB.queryMethodWithout();
cursorQuery.moveToFirst();
String story = cursorQuery.getString(0);
displayMessage(story);
}
protected void onDestroy(){
super.onDestroy();
cursorQuery.close();
myDB.close();
}
}
Here is my full LogCat!
07-17 11:47:34.760: D/(945): HostConnection::get() New Host Connection established 0xb823def0, tid 945
07-17 11:47:34.990: W/EGL_emulation(945): eglSurfaceAttrib not implemented
07-17 11:47:35.010: D/OpenGLRenderer(945): Enabling debug mode 0
07-17 11:47:37.770: I/SQLiteAssetHelper(945): successfully opened database Test.db
07-17 11:47:37.770: D/AndroidRuntime(945): Shutting down VM
07-17 11:47:37.780: W/dalvikvm(945): threadid=1: thread exiting with uncaught exception (group=0xb3a3dba8)
07-17 11:47:37.800: E/AndroidRuntime(945): FATAL EXCEPTION: main
07-17 11:47:37.800: E/AndroidRuntime(945): Process: com.example.dbquerytester, PID: 945
07-17 11:47:37.800: E/AndroidRuntime(945): java.lang.IllegalStateException: Could not execute method of the activity
07-17 11:47:37.800: E/AndroidRuntime(945): at android.view.View$1.onClick(View.java:3823)
07-17 11:47:37.800: E/AndroidRuntime(945): at android.view.View.performClick(View.java:4438)
07-17 11:47:37.800: E/AndroidRuntime(945): at android.view.View$PerformClick.run(View.java:18422)
07-17 11:47:37.800: E/AndroidRuntime(945): at android.os.Handler.handleCallback(Handler.java:733)
07-17 11:47:37.800: E/AndroidRuntime(945): at android.os.Handler.dispatchMessage(Handler.java:95)
07-17 11:47:37.800: E/AndroidRuntime(945): at android.os.Looper.loop(Looper.java:136)
07-17 11:47:37.800: E/AndroidRuntime(945): at android.app.ActivityThread.main(ActivityThread.java:5017)
07-17 11:47:37.800: E/AndroidRuntime(945): at java.lang.reflect.Method.invokeNative(Native Method)
07-17 11:47:37.800: E/AndroidRuntime(945): at java.lang.reflect.Method.invoke(Method.java:515)
07-17 11:47:37.800: E/AndroidRuntime(945): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
07-17 11:47:37.800: E/AndroidRuntime(945): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
07-17 11:47:37.800: E/AndroidRuntime(945): at dalvik.system.NativeStart.main(Native Method)
07-17 11:47:37.800: E/AndroidRuntime(945): Caused by: java.lang.reflect.InvocationTargetException
07-17 11:47:37.800: E/AndroidRuntime(945): at java.lang.reflect.Method.invokeNative(Native Method)
07-17 11:47:37.800: E/AndroidRuntime(945): at java.lang.reflect.Method.invoke(Method.java:515)
07-17 11:47:37.800: E/AndroidRuntime(945): at android.view.View$1.onClick(View.java:3818)
07-17 11:47:37.800: E/AndroidRuntime(945): ... 11 more
07-17 11:47:37.800: E/AndroidRuntime(945): Caused by: java.lang.NullPointerException
07-17 11:47:37.800: E/AndroidRuntime(945): at com.example.dbquerytester.MyDB.queryMethodWithout(MyDB.java:68)
07-17 11:47:37.800: E/AndroidRuntime(945): at com.example.dbquerytester.Main_Activity.onClickQuery(Main_Activity.java:67)
07-17 11:47:37.800: E/AndroidRuntime(945): ... 14 more
I am trying to parse a value through intent while switching between activities.
I know I should read values from last intent with getExtra but I don't know why it doesn't work.
Also when I switch between activities on button click, application crashes.
In activity main I read text from editText and put it in Intent:
public void schimba(View view){
int value = Integer.parseInt(instances.getText().toString());;
Intent intent = new Intent(this, Tabel.class);
intent.putExtra("max", value);
startActivity(intent);
}
When it switch to activity 2 I have this:
Intent intentObject = getIntent();
int value;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
value = intentObject.getIntExtra("max", 0);
/*
for(i=0;i<=value;i++)
{
LayoutInflater layoutinflate = null;
layoutinflate = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
final View rowview = layoutinflate.inflate( R.layout.activity_tabel, null);
}
*/
setContentView(R.layout.activity_tabel);
TextView showvalue;
showvalue = (TextView) findViewById(R.id.ShowValue);
showvalue.setText(""+value);
The idea is that I want to use this value in a for loop, I already know how to display the value in a textView but I don't need it, I wanna use it in for.
Logcat:
04-23 10:40:52.550: E/AndroidRuntime(1010): FATAL EXCEPTION: main
04-23 10:40:52.550: E/AndroidRuntime(1010): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.instances_temperature/com.example.instances_temperature.Tabel}: java.lang.NullPointerException
04-23 10:40:52.550: E/AndroidRuntime(1010): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
04-23 10:40:52.550: E/AndroidRuntime(1010): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
04-23 10:40:52.550: E/AndroidRuntime(1010): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
04-23 10:40:52.550: E/AndroidRuntime(1010): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
04-23 10:40:52.550: E/AndroidRuntime(1010): at android.os.Handler.dispatchMessage(Handler.java:99)
04-23 10:40:52.550: E/AndroidRuntime(1010): at android.os.Looper.loop(Looper.java:123)
04-23 10:40:52.550: E/AndroidRuntime(1010): at android.app.ActivityThread.main(ActivityThread.java:4627)
04-23 10:40:52.550: E/AndroidRuntime(1010): at java.lang.reflect.Method.invokeNative(Native Method)
04-23 10:40:52.550: E/AndroidRuntime(1010): at java.lang.reflect.Method.invoke(Method.java:521)
04-23 10:40:52.550: E/AndroidRuntime(1010): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
04-23 10:40:52.550: E/AndroidRuntime(1010): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
04-23 10:40:52.550: E/AndroidRuntime(1010): at dalvik.system.NativeStart.main(Native Method)
04-23 10:40:52.550: E/AndroidRuntime(1010): Caused by: java.lang.NullPointerException
04-23 10:40:52.550: E/AndroidRuntime(1010): at com.example.instances_temperature.Tabel.onCreate(Tabel.java:26)
04-23 10:40:52.550: E/AndroidRuntime(1010): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
04-23 10:40:52.550: E/AndroidRuntime(1010): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
04-23 10:40:52.550: E/AndroidRuntime(1010): ... 11 more
line 26 would be this:
value = intentObject.getIntExtra("max", 0);
You have to use the code below
int maxValue = getIntent().getExtras().getInt("max");
inside onCreate().
Hope it will solve your problem..
You have not declared intentObject...
Use this:
value = getIntent().getIntExtra("max", 0);
use this
value = getIntent().getStringExtra("max");
instead of this
value = intentObject.getIntExtra("max", 0);
My application crashes whenever I launch it! whats wrong with it? I have created a database and I am trying to populate my listview from the database I have created what is the problem with the code and what is the fix for it?
02-19 22:02:07.502: D/AndroidRuntime(330): Shutting down VM
02-19 22:02:07.502: W/dalvikvm(330): threadid=1: thread exiting with uncaught exception (group=0x40015560)
02-19 22:02:07.542: E/AndroidRuntime(330): FATAL EXCEPTION: main
02-19 22:02:07.542: E/AndroidRuntime(330): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.database/com.example.database.MainActivity}: java.lang.ClassNotFoundException: com.example.database.MainActivity in loader dalvik.system.PathClassLoader[/data/app/com.example.database-1.apk]
02-19 22:02:07.542: E/AndroidRuntime(330): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1569)
02-19 22:02:07.542: E/AndroidRuntime(330): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
02-19 22:02:07.542: E/AndroidRuntime(330): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
02-19 22:02:07.542: E/AndroidRuntime(330): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
02-19 22:02:07.542: E/AndroidRuntime(330): at android.os.Handler.dispatchMessage(Handler.java:99)
02-19 22:02:07.542: E/AndroidRuntime(330): at android.os.Looper.loop(Looper.java:123)
02-19 22:02:07.542: E/AndroidRuntime(330): at android.app.ActivityThread.main(ActivityThread.java:3683)
02-19 22:02:07.542: E/AndroidRuntime(330): at java.lang.reflect.Method.invokeNative(Native Method)
02-19 22:02:07.542: E/AndroidRuntime(330): at java.lang.reflect.Method.invoke(Method.java:507)
02-19 22:02:07.542: E/AndroidRuntime(330): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
02-19 22:02:07.542: E/AndroidRuntime(330): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
02-19 22:02:07.542: E/AndroidRuntime(330): at dalvik.system.NativeStart.main(Native Method)
02-19 22:02:07.542: E/AndroidRuntime(330): Caused by: java.lang.ClassNotFoundException: com.example.database.MainActivity in loader dalvik.system.PathClassLoader[/data/app/com.example.database-1.apk]
02-19 22:02:07.542: E/AndroidRuntime(330): at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:240)
02-19 22:02:07.542: E/AndroidRuntime(330): at java.lang.ClassLoader.loadClass(ClassLoader.java:551)
02-19 22:02:07.542: E/AndroidRuntime(330): at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
02-19 22:02:07.542: E/AndroidRuntime(330): at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
02-19 22:02:07.542: E/AndroidRuntime(330): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1561)
02-19 22:02:07.542: E/AndroidRuntime(330): ... 11 more
02-19 22:10:47.354: D/AndroidRuntime(364): Shutting down VM
02-19 22:10:47.444: W/dalvikvm(364): threadid=1: thread exiting with uncaught exception (group=0x40015560)
02-19 22:10:47.482: E/AndroidRuntime(364): FATAL EXCEPTION: main
02-19 22:10:47.482: E/AndroidRuntime(364): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.database/com.example.database.MainActivity}: java.lang.ClassNotFoundException: com.example.database.MainActivity in loader dalvik.system.PathClassLoader[/data/app/com.example.database-2.apk]
02-19 22:10:47.482: E/AndroidRuntime(364): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1569)
02-19 22:10:47.482: E/AndroidRuntime(364): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
02-19 22:10:47.482: E/AndroidRuntime(364): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
02-19 22:10:47.482: E/AndroidRuntime(364): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
02-19 22:10:47.482: E/AndroidRuntime(364): at android.os.Handler.dispatchMessage(Handler.java:99)
02-19 22:10:47.482: E/AndroidRuntime(364): at android.os.Looper.loop(Looper.java:123)
02-19 22:10:47.482: E/AndroidRuntime(364): at android.app.ActivityThread.main(ActivityThread.java:3683)
02-19 22:10:47.482: E/AndroidRuntime(364): at java.lang.reflect.Method.invokeNative(Native Method)
02-19 22:10:47.482: E/AndroidRuntime(364): at java.lang.reflect.Method.invoke(Method.java:507)
02-19 22:10:47.482: E/AndroidRuntime(364): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
02-19 22:10:47.482: E/AndroidRuntime(364): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
02-19 22:10:47.482: E/AndroidRuntime(364): at dalvik.system.NativeStart.main(Native Method)
02-19 22:10:47.482: E/AndroidRuntime(364): Caused by: java.lang.ClassNotFoundException: com.example.database.MainActivity in loader dalvik.system.PathClassLoader[/data/app/com.example.database-2.apk]
02-19 22:10:47.482: E/AndroidRuntime(364): at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:240)
02-19 22:10:47.482: E/AndroidRuntime(364): at java.lang.ClassLoader.loadClass(ClassLoader.java:551)
02-19 22:10:47.482: E/AndroidRuntime(364): at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
02-19 22:10:47.482: E/AndroidRuntime(364): at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
02-19 22:10:47.482: E/AndroidRuntime(364): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1561)
02-19 22:10:47.482: E/AndroidRuntime(364): ... 11 more
02-19 22:11:10.302: I/Process(364): Sending signal. PID: 364 SIG: 9
02-19 22:11:17.712: D/AndroidRuntime(413): Shutting down VM
02-19 22:11:17.712: W/dalvikvm(413): threadid=1: thread exiting with uncaught exception (group=0x40015560)
02-19 22:11:17.852: E/AndroidRuntime(413): FATAL EXCEPTION: main
02-19 22:11:17.852: E/AndroidRuntime(413): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.database/com.example.database.MainActivity}: java.lang.ClassNotFoundException: com.example.database.MainActivity in loader dalvik.system.PathClassLoader[/data/app/com.example.database-2.apk]
02-19 22:11:17.852: E/AndroidRuntime(413): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1569)
02-19 22:11:17.852: E/AndroidRuntime(413): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
02-19 22:11:17.852: E/AndroidRuntime(413): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
02-19 22:11:17.852: E/AndroidRuntime(413): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
02-19 22:11:17.852: E/AndroidRuntime(413): at android.os.Handler.dispatchMessage(Handler.java:99)
02-19 22:11:17.852: E/AndroidRuntime(413): at android.os.Looper.loop(Looper.java:123)
02-19 22:11:17.852: E/AndroidRuntime(413): at android.app.ActivityThread.main(ActivityThread.java:3683)
02-19 22:11:17.852: E/AndroidRuntime(413): at java.lang.reflect.Method.invokeNative(Native Method)
02-19 22:11:17.852: E/AndroidRuntime(413): at java.lang.reflect.Method.invoke(Method.java:507)
02-19 22:11:17.852: E/AndroidRuntime(413): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
02-19 22:11:17.852: E/AndroidRuntime(413): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
02-19 22:11:17.852: E/AndroidRuntime(413): at dalvik.system.NativeStart.main(Native Method)
02-19 22:11:17.852: E/AndroidRuntime(413): Caused by: java.lang.ClassNotFoundException: com.example.database.MainActivity in loader dalvik.system.PathClassLoader[/data/app/com.example.database-2.apk]
02-19 22:11:17.852: E/AndroidRuntime(413): at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:240)
02-19 22:11:17.852: E/AndroidRuntime(413): at java.lang.ClassLoader.loadClass(ClassLoader.java:551)
02-19 22:11:17.852: E/AndroidRuntime(413): at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
02-19 22:11:17.852: E/AndroidRuntime(413): at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
02-19 22:11:17.852: E/AndroidRuntime(413): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1561)
02-19 22:11:17.852: E/AndroidRuntime(413): ... 11 more
02-19 22:11:19.852: I/Process(413): Sending signal. PID: 413 SIG: 9
Activity:
package com.example.database;
import android.app.Activity;
import android.database.Cursor;
import android.os.Bundle;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
public class AndroidSQLite extends Activity {
private DBHelper mySQLiteAdapter;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ListView listContent = (ListView)findViewById(R.id.contentlist);
/*
* Create/Open a SQLite database
* and fill with dummy content
* and close it
*/
mySQLiteAdapter = new DBHelper(this);
mySQLiteAdapter.openToWrite();
mySQLiteAdapter.deleteAll();
mySQLiteAdapter.insert("A for Apply");
mySQLiteAdapter.insert("B for Boy");
mySQLiteAdapter.insert("C for Cat");
mySQLiteAdapter.insert("D for Dog");
mySQLiteAdapter.insert("E for Egg");
mySQLiteAdapter.insert("F for Fish");
mySQLiteAdapter.insert("G for Girl");
mySQLiteAdapter.insert("H for Hand");
mySQLiteAdapter.insert("I for Ice-scream");
mySQLiteAdapter.insert("J for Jet");
mySQLiteAdapter.insert("K for Kite");
mySQLiteAdapter.insert("L for Lamp");
mySQLiteAdapter.insert("M for Man");
mySQLiteAdapter.insert("N for Nose");
mySQLiteAdapter.insert("O for Orange");
mySQLiteAdapter.insert("P for Pen");
mySQLiteAdapter.insert("Q for Queen");
mySQLiteAdapter.insert("R for Rain");
mySQLiteAdapter.insert("S for Sugar");
mySQLiteAdapter.insert("T for Tree");
mySQLiteAdapter.insert("U for Umbrella");
mySQLiteAdapter.insert("V for Van");
mySQLiteAdapter.insert("W for Water");
mySQLiteAdapter.insert("X for X'mas");
mySQLiteAdapter.insert("Y for Yellow");
mySQLiteAdapter.insert("Z for Zoo");
mySQLiteAdapter.close();
/*
* Open the same SQLite database
* and read all it's content.
*/
mySQLiteAdapter = new DBHelper(this);
mySQLiteAdapter.openToRead();
Cursor cursor = mySQLiteAdapter.queueAll();
startManagingCursor(cursor);
String[] from = new String[]{DBHelper.KEY_CONTENT};
int[] to = new int[]{R.id.text};
SimpleCursorAdapter cursorAdapter =
new SimpleCursorAdapter(this, R.layout.row, cursor, from, to);
listContent.setAdapter(cursorAdapter);
mySQLiteAdapter.close();
}
}
Database Class
package com.example.database;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
public class DBHelper {
public static final String MYDATABASE_NAME = "MY_DATABASE";
public static final String MYDATABASE_TABLE = "MY_TABLE";
public static final int MYDATABASE_VERSION = 1;
public static final String KEY_ID = "_id";
public static final String KEY_CONTENT = "Content";
//create table MY_DATABASE (ID integer primary key, Content text not null);
private static final String SCRIPT_CREATE_DATABASE =
"create table " + MYDATABASE_TABLE + " ("
+ KEY_ID + " integer primary key autoincrement, "
+ KEY_CONTENT + " text not null);";
private SQLiteHelper sqLiteHelper;
private SQLiteDatabase sqLiteDatabase;
private Context context;
public DBHelper(Context c){
context = c;
}
public DBHelper openToRead() throws android.database.SQLException {
sqLiteHelper = new SQLiteHelper(context, MYDATABASE_NAME, null, MYDATABASE_VERSION);
sqLiteDatabase = sqLiteHelper.getReadableDatabase();
return this;
}
public DBHelper openToWrite() throws android.database.SQLException {
sqLiteHelper = new SQLiteHelper(context, MYDATABASE_NAME, null, MYDATABASE_VERSION);
sqLiteDatabase = sqLiteHelper.getWritableDatabase();
return this;
}
public void close(){
sqLiteHelper.close();
}
public long insert(String content){
ContentValues contentValues = new ContentValues();
contentValues.put(KEY_CONTENT, content);
return sqLiteDatabase.insert(MYDATABASE_TABLE, null, contentValues);
}
public int deleteAll(){
return sqLiteDatabase.delete(MYDATABASE_TABLE, null, null);
}
public Cursor queueAll(){
String[] columns = new String[]{KEY_ID, KEY_CONTENT};
Cursor cursor = sqLiteDatabase.query(MYDATABASE_TABLE, columns,
null, null, null, null, null);
return cursor;
}
public class SQLiteHelper extends SQLiteOpenHelper {
public SQLiteHelper(Context context, String name,
CursorFactory factory, int version) {
super(context, name, factory, version);
}
#Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
db.execSQL(SCRIPT_CREATE_DATABASE);
}
#Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
}
}
}
you are Tryin to load MainActivity
java.lang.ClassNotFoundException: com.example.database.MainActivity
inside your Manifest.xml change MainActivity to AndroidSQLite.
And you must use an Asynctask for the Database operations, to avoid ANR Dialog.
I am getting a NullPointerException when trying to declare the Geocoder in my application. I have the following declaration :
public class MainActivity extends Activity {
private Geocoder geocoder = new Geocoder(this, Locale.getDefault());
...
}
I get the following LogCat :
03-20 10:48:55.729: D/AndroidRuntime(604): Shutting down VM
03-20 10:48:55.729: W/dalvikvm(604): threadid=1: thread exiting with uncaught exception
(group=0x40a71930)
03-20 10:48:56.209: E/AndroidRuntime(604): FATAL EXCEPTION: main
03-20 10:48:56.209: E/AndroidRuntime(604): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.coord/com.example.coord.MainActivity}: java.lang.NullPointerException
03-20 10:48:56.209: E/AndroidRuntime(604): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2106)
03-20 10:48:56.209: E/AndroidRuntime(604): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
03-20 10:48:56.209: E/AndroidRuntime(604): at android.app.ActivityThread.access$600(ActivityThread.java:141)
03-20 10:48:56.209: E/AndroidRuntime(604): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
03-20 10:48:56.209: E/AndroidRuntime(604): at android.os.Handler.dispatchMessage(Handler.java:99)
03-20 10:48:56.209: E/AndroidRuntime(604): at android.os.Looper.loop(Looper.java:137)
03-20 10:48:56.209: E/AndroidRuntime(604): at android.app.ActivityThread.main(ActivityThread.java:5041)
03-20 10:48:56.209: E/AndroidRuntime(604): at java.lang.reflect.Method.invokeNative(Native Method)
03-20 10:48:56.209: E/AndroidRuntime(604): at java.lang.reflect.Method.invoke(Method.java:511)
03-20 10:48:56.209: E/AndroidRuntime(604): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
03-20 10:48:56.209: E/AndroidRuntime(604): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
03-20 10:48:56.209: E/AndroidRuntime(604): at dalvik.system.NativeStart.main(Native Method)
03-20 10:48:56.209: E/AndroidRuntime(604): Caused by: java.lang.NullPointerException
03-20 10:48:56.209: E/AndroidRuntime(604): at android.content.ContextWrapper.getApplicationContext(ContextWrapper.java:109)
03-20 10:48:56.209: E/AndroidRuntime(604): at com.example.coord.MainActivity.<init>(MainActivity.java:21)
03-20 10:48:56.209: E/AndroidRuntime(604): at java.lang.Class.newInstanceImpl(Native Method)
03-20 10:48:56.209: E/AndroidRuntime(604): at java.lang.Class.newInstance(Class.java:1319)
03-20 10:48:56.209: E/AndroidRuntime(604): at android.app.Instrumentation.newActivity(Instrumentation.java:1054)
03-20 10:48:56.209: E/AndroidRuntime(604): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2097)
Line 21 is my Geocoder declaration. What is wrong with my code?
The context is only available when the activity is started so you cannot initialize the geocoder in the class body. Try to initialize it in the onCreate or onResume method instead...
public class MainActivity extends Activity {
private Geocoder mGeocoder;
#Override
protected void onCreate(Bundle _icicle) {
super.onCreate(_icicle);
mGeocoder = new Geocoder(getApplicationContext(), Locale.getDefault());
}
}
Add this permissions in to manifest
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
and use getApplicationContext() insted of this
It is recommended to use the GeoCode in Background or on separate thread as defined by Google Developers page.
new Thread(new Runnable()
{
#Override
public void run()
{
//Do things.
Geocoder geocoder = new Geocoder(getBaseContext());
try {
// Getting a maximum of 5 Address that matches the input text
addresses = geocoder.getFromLocationName(addressText,5);
} catch (IOException e) {
e.printStackTrace();
}
}
}).start();
I have this code for an expandable list, I want to have a checkbox in the childgroups of the list view, and check if one of the checkboxes is checked.
The problem is that when I check if the checkbox is checked I get a NULL Pointer Exception.
Can you please tell me whats wrong?
here's my code - I've edited the code to inflate a view of the child_row.xml that holds that checkbox but I still get that null pointer, what am I doing wrong?!?!
package send.Shift;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import android.app.ExpandableListActivity;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.Window;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.ExpandableListView;
import android.widget.SimpleExpandableListAdapter;
import android.widget.TextView;
public class Shifts extends ExpandableListActivity implements
OnCheckedChangeListener {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.list);
SimpleExpandableListAdapter expListAdapter = new SimpleExpandableListAdapter(
this, createGroupList(), R.layout.group_row,
new String[] { "Group Item" }, new int[] { R.id.row_name },
createChildList(), R.layout.child_row,
new String[] { "Sub Item" }, new int[] { R.id.grp_child });
getExpandableListView().setGroupIndicator(
getResources().getDrawable(R.drawable.expander_group));
ExpandableListView EX = (ExpandableListView) findViewById(android.R.id.list);
EX.setAdapter(expListAdapter);
final CheckBox childBox = (CheckBox) findViewById(R.id.childBOX);
final TextView choosenGroup = (TextView) findViewById(R.id.choosen);
LayoutInflater inflater = LayoutInflater.from(Shifts.this);
View view2 = inflater.inflate(R.layout.child_row, null);
childBox.setOnCheckedChangeListener(new OnCheckedChangeListener() {
#Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
// TODO Auto-generated method stub
if(childBox.isChecked() == true){
choosenGroup.setText("Shift Set");
}
}
});
}
Here is some of the Logcat log:
12-23 07:38:00.644: W/dalvikvm(880): threadid=1: thread exiting with uncaught exception (group=0x40015560)
12-23 07:38:00.654: E/AndroidRuntime(880): FATAL EXCEPTION: main
12-23 07:38:00.654: E/AndroidRuntime(880): java.lang.RuntimeException: Unable to start activity ComponentInfo{send.Shift/send.Shift.Shifts}: java.lang.NullPointerException
12-23 07:38:00.654: E/AndroidRuntime(880): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
12-23 07:38:00.654: E/AndroidRuntime(880): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
12-23 07:38:00.654: E/AndroidRuntime(880): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
12-23 07:38:00.654: E/AndroidRuntime(880): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
12-23 07:38:00.654: E/AndroidRuntime(880): at android.os.Handler.dispatchMessage(Handler.java:99)
12-23 07:38:00.654: E/AndroidRuntime(880): at android.os.Looper.loop(Looper.java:123)
12-23 07:38:00.654: E/AndroidRuntime(880): at android.app.ActivityThread.main(ActivityThread.java:3683)
12-23 07:38:00.654: E/AndroidRuntime(880): at java.lang.reflect.Method.invokeNative(Native Method)
12-23 07:38:00.654: E/AndroidRuntime(880): at java.lang.reflect.Method.invoke(Method.java:507)
12-23 07:38:00.654: E/AndroidRuntime(880): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
12-23 07:38:00.654: E/AndroidRuntime(880): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
12-23 07:38:00.654: E/AndroidRuntime(880): at dalvik.system.NativeStart.main(Native Method)
12-23 07:38:00.654: E/AndroidRuntime(880): Caused by: java.lang.NullPointerException
12-23 07:38:00.654: E/AndroidRuntime(880): at send.Shift.Shifts.onCreate(Shifts.java:41)
12-23 07:38:00.654: E/AndroidRuntime(880): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
12-23 07:38:00.654: E/AndroidRuntime(880): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
12-23 07:38:00.654: E/AndroidRuntime(880): ... 11 more
If you get a nullpointer on a certain line, something on that line is null. If it is the if(childBox.isChecked() line, probably childBox is null. Hard to say without the stack, but most probable cause is the line where you retrieve that checkbox.
final CheckBox childBox = (CheckBox) findViewById(R.id.childBOX);
Might be returning null, and this could be for several reasons. It could be your id is childBox instead of childBOX. Or that it is not in R.layout.list.
The best thing you can do is start debugging. What line is the error. Find the object that is null. Find out why it is null and if that is expected or not.
Instead of checking the childBox.isChecked() you can use the isChecked value. So your code would look like this:
#Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if(isChecked == true){
choosenGroup.setText("Shift Set");
}
}
Check your layout list.xml I think this layout may is missing android:id="#+id/childBOX" for Check Box or android:id="#+id/choosen" for TextView
Check the folowin sample
<CheckBox android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/childBOX"/>
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/choosen"/>