Develop Reference

Start activity from service isn't working (Android)

I created an overlay "always on top button", which is a service HUD, and I can't start an activity screen from there, it gives the error: "Unfortunately App has stopped". In the beginning, all I used to know if there was any TouchEventwas a toast, and that toast was created, but it was created several times, so I don't know if it gives that error because this code, which is on TouchEvent body , is repeated several times too.
here is my code:
public class HUD extends Service implements OnClickListener, OnTouchListener, OnLongClickListener {
Button mButton;
#Override
public IBinder onBind(Intent intent) {
return null;
}
#Override
public void onCreate() {
super.onCreate();
//mView = new HUDView(this);
mButton = new Button(this);
mButton.setId(1);
mButton.setText("Button");
mButton.setClickable(true);
mButton.setOnTouchListener(this);
WindowManager.LayoutParams params = new WindowManager.LayoutParams(
WindowManager.LayoutParams.WRAP_CONTENT,
WindowManager.LayoutParams.WRAP_CONTENT,
WindowManager.LayoutParams.TYPE_PHONE,
WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL |
WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
PixelFormat.OPAQUE);
params.gravity = Gravity.LEFT | Gravity.TOP;
params.setTitle("Load Average");
WindowManager wm = (WindowManager) getSystemService(WINDOW_SERVICE);
wm.addView(mButton, params);
}
#Override
public void onDestroy() {
super.onDestroy();
if(mButton != null)
{
((WindowManager) getSystemService(WINDOW_SERVICE)).removeView(mButton);
mButton = null;
}
}
#Override
public boolean onTouch(View v, MotionEvent event) {
if(event.getX()<mButton.getWidth() & event.getY()>0)
{
Toast.makeText(this,"Overlay button event", Toast.LENGTH_SHORT).show(); //this my toast
Intent i = new Intent(); //this is my new acivity (intent)
i.setClass(HUD.this, screen.class);
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(i);
HUD.this.stopSelf();
}
return false;
}
#Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
Toast.makeText(this,"Click", Toast.LENGTH_SHORT).show();
}
#Override
public boolean onLongClick(View v) {
// TODO Auto-generated method stub
System.exit(1);
return false;
}
}
So my question is, is this code on TouchEvent body being repeated several times? If it is, is that the cause of the error?
log cat:
07-20 22:11:06.962: I/Choreographer(1620): Skipped 52 frames! The application may be doing too much work on its main thread.
07-20 22:11:08.062: D/AndroidRuntime(1620): Shutting down VM
07-20 22:11:08.062: W/dalvikvm(1620): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
07-20 22:11:08.132: E/AndroidRuntime(1620): FATAL EXCEPTION: main
07-20 22:11:08.132: E/AndroidRuntime(1620): android.app.SuperNotCalledException: Activity {com.example.screenshot/com.example.screenshot.screen} did not call through to super.onCreate()
07-20 22:11:08.132: E/AndroidRuntime(1620): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2146)
07-20 22:11:08.132: E/AndroidRuntime(1620): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
07-20 22:11:08.132: E/AndroidRuntime(1620): at android.app.ActivityThread.access$600(ActivityThread.java:141)
07-20 22:11:08.132: E/AndroidRuntime(1620): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
07-20 22:11:08.132: E/AndroidRuntime(1620): at android.os.Handler.dispatchMessage(Handler.java:99)
07-20 22:11:08.132: E/AndroidRuntime(1620): at android.os.Looper.loop(Looper.java:137)
07-20 22:11:08.132: E/AndroidRuntime(1620): at android.app.ActivityThread.main(ActivityThread.java:5041)
07-20 22:11:08.132: E/AndroidRuntime(1620): at java.lang.reflect.Method.invokeNative(Native Method)
07-20 22:11:08.132: E/AndroidRuntime(1620): at java.lang.reflect.Method.invoke(Method.java:511)
07-20 22:11:08.132: E/AndroidRuntime(1620): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
07-20 22:11:08.132: E/AndroidRuntime(1620): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
07-20 22:11:08.132: E/AndroidRuntime(1620): at dalvik.system.NativeStart.main(Native Method)
screen.java:
public class screen extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
Toast.makeText(getApplicationContext(), "Made it", 0).show();
finish();
}
}

See android start activity from service
Intent i= new Intent(getBaseContext(), screen.class);
i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
getApplication().startActivity(i);
You error seems to be inside screen activity. There are many thread which might help to figure out the error that you are getting for the activity:
Error in Android "SuperNotCalledException:Activity did not call through to super.OnCreate()"
android.app.SuperNotCalledException: Activity did not call through to super.onStop()
Update
The error is because you haven't called: super.onCreate(savedInstanceState); in your screen activity's onCreate(). That should be the first thing to be called in onCreate(). Do something like this:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//.... other stuff
}
Hope this helps.

java.lang.NullPointerException:com.google.android.gms.maps.GoogleMap.moveCamera

I am currently working on the new Google Maps Android API v2.
My MapActivity class is working with my Samsung galaxy s3 ans s2 with the code below:
However, there are some particular devices are not working such as: GT-S5830i
class MapActivity extends FragmentActivity implements OnMapClickListener, OnMapLongClickListener, OnMarkerClickListener
{
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_map);
tvLocInfo = (TextView)findViewById(R.id.locinfo);
android.support.v4.app.FragmentManager myFragmentManager = getSupportFragmentManager();
SupportMapFragment myMapFragment = (SupportMapFragment)myFragmentManager.findFragmentById(R.id.map);
myMap = myMapFragment.getMap();
myMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
ArrayList<Cooridnates> cooridnatesList = MainActivity.getList();
for(int i=0;i<cooridnatesList.size();i++)
{
//Toast.makeText(MapActivity.this, "SIZE : " + " " + cooridnatesList.size(), Toast.LENGTH_LONG).show();
LatLng point = new LatLng(cooridnatesList.get(i).getLat(),cooridnatesList.get(i).getLon());
tvLocInfo.setText("markers added");
myMap.addMarker(new MarkerOptions().position(point).title(point.toString()));
center=CameraUpdateFactory.newLatLng(point);
}
CameraUpdate zoom=CameraUpdateFactory.zoomTo(16);
myMap.moveCamera(center);
myMap.animateCamera(zoom);
myMap.setOnMapClickListener(this);
myMap.setOnMarkerClickListener(this);
markerClicked = false;
}
For some reason, I am getting this error:
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.coldice.plotfinder/com.coldice.plotfinder.MapActivity}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1651)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667)
at android.app.ActivityThread.access$1500(ActivityThread.java:117)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:130)
at android.app.ActivityThread.main(ActivityThread.java:3687)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at com.google.android.gms.maps.GoogleMap.moveCamera(Unknown Source)
at com.coldice.plotfinder.MapActivity.onCreate(MapActivity.java:70)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1615)
... 11 more

You function MainActivity.getList() probably returned an empty list, so for loop doesn't execute center=CameraUpdateFactory.newLatLng(point);.

it seems center is null in this >> myMap.moveCamera(center);, make an appropriate check on this variable before passing it in moveCamera method.

It seems problem is here. center might have null value, So to get proper explanation debug your application.
center is initialzed here.
center=CameraUpdateFactory.newLatLng(point);
It might assign null in center.
myMap.moveCamera(center); <<<PROBLEM is here
if(center != null )
myMap.moveCamera(center);

how to find null pointer exception with logcat

I'm trying to build a small app that takes a data file in external storage and emails it. I keep getting 'null pointer exceptions' right away in logcat and then my app dies. I can't seem to locate my exception and I am wondering if there is a way to determine the line of code that is causing this. I have the MainActivity class and then a class called SendData- the code is below. I'm new at this so any help would be greatly appreciated- thank you.
private static final String TAG = "MainActivity_ErrorLog";
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
#Override
public boolean onCreateOptionsMenu(Menu menu)
{
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
// Create the getData intent
Intent intentgetData = new Intent(MainActivity.this, SendData.class);
public void onStart()
{
{
try
{
File sd = Environment.getExternalStorageDirectory();
File data = Environment.getDataDirectory();
if (sd.canWrite())
{
// verify the paths
String currentDBPath = "TLC_COMMON/database.db";
String backupDBPath = "database.db";
File currentDB = new File(data, currentDBPath);
File backupDB = new File(sd, backupDBPath);
if (currentDB.exists())
{
FileChannel src = new FileInputStream(currentDB).getChannel();
FileChannel dst = new FileOutputStream(backupDB).getChannel();
dst.transferFrom(src, 0, src.size());
src.close();
dst.close();
}
}
}
catch (Exception e)
{
// change the V below to E when complete
Log.v(TAG,"ERROR: Database file not created");
}
startActivity(intentgetData);
}
}
}
--new class
public class SendData extends Activity
{
private static final String TAG = "MainActivity";
/* Checks if external storage is available to read */
public boolean isExternalStorageReadable()
{
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state) ||
Environment.MEDIA_MOUNTED_READ_ONLY.equals(state))
{
return true;
}
return false;
}
/** Called when the user clicks the Send My Data button */
public SendData(View view)
{
// Send data by email
{
File root = Environment.getExternalStorageDirectory();
// verify it is saving as this file name; also path in previous class
String fileName = "database.db";
if (root.canWrite())
{
File attachment = new File(root, fileName);
Intent email = new Intent(Intent.ACTION_SENDTO);
email.putExtra(android.content.Intent.EXTRA_SUBJECT, "Exercise data");
email.putExtra(android.content.Intent.EXTRA_EMAIL, new String[]{"test#gmail.com"});
// is the Uri necessary?
email.putExtra(android.content.Intent.EXTRA_TEXT, Uri.fromFile(attachment));
// look at this VVV
startActivity(Intent.createChooser(email, "Send the data via Email"));}
else
{
// Change the V below to E when complete
Log.v(TAG, "Email send failed");
}
}
}
public void finish()
{
}
}
11-13 13:29:37.343: W/dalvikvm(3319): threadid=1: thread exiting with uncaught exception (group=0x418e3300)
11-13 13:29:37.343: E/AndroidRuntime(3319): FATAL EXCEPTION: main
11-13 13:29:37.343: E/AndroidRuntime(3319): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.va.datasender/com.example.va.datasender.MainActivity}: java.lang.NullPointerException
11-13 13:29:37.343: E/AndroidRuntime(3319): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1983)
11-13 13:29:37.343: E/AndroidRuntime(3319): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
11-13 13:29:37.343: E/AndroidRuntime(3319): at android.app.ActivityThread.access$600(ActivityThread.java:130)
11-13 13:29:37.343: E/AndroidRuntime(3319): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
11-13 13:29:37.343: E/AndroidRuntime(3319): at android.os.Handler.dispatchMessage(Handler.java:99)
11-13 13:29:37.343: E/AndroidRuntime(3319): at android.os.Looper.loop(Looper.java:137)
11-13 13:29:37.343: E/AndroidRuntime(3319): at android.app.ActivityThread.main(ActivityThread.java:4745)
11-13 13:29:37.343: E/AndroidRuntime(3319): at java.lang.reflect.Method.invokeNative(Native Method)
11-13 13:29:37.343: E/AndroidRuntime(3319): at java.lang.reflect.Method.invoke(Method.java:511)
11-13 13:29:37.343: E/AndroidRuntime(3319): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
11-13 13:29:37.343: E/AndroidRuntime(3319): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
11-13 13:29:37.343: E/AndroidRuntime(3319): at dalvik.system.NativeStart.main(Native Method)
11-13 13:29:37.343: E/AndroidRuntime(3319): Caused by: java.lang.NullPointerException
11-13 13:29:37.343: E/AndroidRuntime(3319): at android.content.ContextWrapper.getPackageName(ContextWrapper.java:127)
11-13 13:29:37.343: E/AndroidRuntime(3319): at android.content.ComponentName.<init>(ComponentName.java:75)
11-13 13:29:37.343: E/AndroidRuntime(3319): at android.content.Intent.<init>(Intent.java:3301)
11-13 13:29:37.343: E/AndroidRuntime(3319): at com.example.va.datasender.MainActivity.<init>(MainActivity.java:36)
11-13 13:29:37.343: E/AndroidRuntime(3319): at java.lang.Class.newInstanceImpl(Native Method)
11-13 13:29:37.343: E/AndroidRuntime(3319): at java.lang.Class.newInstance(Class.java:1319)
11-13 13:29:37.343: E/AndroidRuntime(3319): at android.app.Instrumentation.newActivity(Instrumentation.java:1053)
11-13 13:29:37.343: E/AndroidRuntime(3319): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1974)
11-13 13:29:37.343: E/AndroidRuntime(3319): ... 11 more

Find the lowest "Caused by" and continue down until you reach a line from your code:
Caused by: java.lang.NullPointerException
at android.content.ContextWrapper.getPackageName(ContextWrapper.java:127)
at android.content.ComponentName.<init>(ComponentName.java:75)
at android.content.Intent.<init>(Intent.java:3301)
at com.example.va.datasender.MainActivity.<init>(MainActivity.java:36)
The <init> means you are doing something as a class variable or inside a constructor before the Activity has a valid Context... But the specific problem is on line 36.
I would guess that you are trying to create an Intent with this. Initialize your Intent inside onCreate() instead.
Found it. Change this:
// Create the getData intent
Intent intentgetData = new Intent(MainActivity.this, SendData.class);
to:
Intent intentgetData;
and inside onCreate() (or onStart() just before calling startActivity()) add:
intentgetData = new Intent(MainActivity.this, SendData.class);

Your problem comes from line 36 on your MainActivity. Check there for the problem.
11-13 13:29:37.343: E/AndroidRuntime(3319): at com.example.va.datasender.MainActivity.<init>(MainActivity.java:36)

The exeption from line number 36: at com.example.va.datasender.MainActivity.<init>(MainActivity.java:36).

Since the error log also shows android.content.Intent.<init> after the MainActivity.java:36, I would check the value for the first parameter in the following line, when instantiating intentgetData:
Intent intentgetData = new Intent(MainActivity.this, SendData.class);
Instead of having the instatiation done there, try doing it in the onStart() method just before calling startActivity(intentgetData);:
Intent intentgetData = new Intent(MainActivity.this, SendData.class);
startActivity(intentgetData);

Fatal Exception in android.widget.Button

I'm pretty new to Java and Android. I'm trying to make an app that calculates a volume of a liquid in a cylinder, then return the result to a textView box. But now when I click the button to Calculate, it is crashing and I don't know what I'm missing. Everything compiles fine.
package com.somename.fuel.volume.calculator;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.app.Activity;
public class CalculateCylinder extends Activity {
EditText length, width, height, depth;
TextView result;
Button calculate;
double firstNum, secNum, thirdNum, volume, area;
double liqVolume;
double radius;
double a, l, aSide,aTop,b,Arc,FluidSurfaceAreaTotal,r,d,v,h,fsal;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.calculate_cylinder);
calculate = (Button) findViewById(R.id.buttonCylCalc);
length = (EditText) findViewById(R.id.editCylLength);
height = (EditText) findViewById(R.id.editCylHeight);
depth = (EditText) findViewById(R.id.editCylDepth);
result = (TextView) findViewById(R.id.buttonCylResult);
calculate.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
//Toast.makeText(getApplicationContext(), (CharSequence) result, Toast.LENGTH_LONG).show();
try {
calculate();
} catch (Exception e) {
e.printStackTrace();
}
result.setText((CharSequence) result);
}
public TextView calculate() throws Exception {
// TODO Auto-generated method stub
double firstNum = Double.valueOf(length.getText().toString());
double secNum = Double.valueOf(height.getText().toString());
double thirdNum = Double.valueOf(depth.getText().toString());
radius = (secNum/2);
area = ((secNum*secNum)*3.14);
//liqVolume = (firstNum) * (radius*radius)(acos(radius-depth/radius))
// Cubic Volume
v = aSide * l;
// Fluid surface Area, Side
aSide = (r*r)*(3.14 / 2 -Math.acos(1-h/r)) - (r-h)*Math.sqrt(h*(2*r-h));
// Fluid Surface Area Top
aTop = 2*Math.sqrt((r*r)-((r-h)*(r-h) * l));
// Fluid Surface Area Bottom
b = fsal*l;
// Fluid Surface Area Total
FluidSurfaceAreaTotal = 2*aSide+aTop+b;
// Cylinder Radius
r = d/2;
// Cylinder Diameter
d = 2*r;
if (h <= r )
// Fluid Side Arc Length
fsal = 2*r*Math.acos((r-h)/r);
else if (h > r)
fsal = 2*r*(3.14-Math.acos((h-r)/r));
return result;
}
});
}
}
Here is a logcat:
10-18 05:24:38.893: E/AndroidRuntime(964): FATAL EXCEPTION: main
10-18 05:24:38.893: E/AndroidRuntime(964): java.lang.ClassCastException: android.widget.Button
10-18 05:24:38.893: E/AndroidRuntime(964): at com.dbryant423.fuel.volume.calculator.CalculateCylinder$1.onClick(CalculateCylinder.java:55 )
10-18 05:24:38.893: E/AndroidRuntime(964): at android.view.View.performClick(View.java:2408)
10-18 05:24:38.893: E/AndroidRuntime(964): at android.view.View$PerformClick.run(View.java:8816)
10-18 05:24:38.893: E/AndroidRuntime(964): at android.os.Handler.handleCallback(Handler.java:587)
10-18 05:24:38.893: E/AndroidRuntime(964): at android.os.Handler.dispatchMessage(Handler.java:92)
10-18 05:24:38.893: E/AndroidRuntime(964): at android.os.Looper.loop(Looper.java:123)
10-18 05:24:38.893: E/AndroidRuntime(964): at android.app.ActivityThread.main(ActivityThread.java:4627)
10-18 05:24:38.893: E/AndroidRuntime(964): at java.lang.reflect.Method.invokeNative(Native Method)
10-18 05:24:38.893: E/AndroidRuntime(964): at java.lang.reflect.Method.invoke(Method.java:521)
10-18 05:24:38.893: E/AndroidRuntime(964): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
10-18 05:24:38.893: E/AndroidRuntime(964): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
10-18 05:24:38.893: E/AndroidRuntime(964): at dalvik.system.NativeStart.main(Native Method)
I've been wracking my brains to try to figure out how to do the math on this, and I've not been able to find the answer to why it's crashing. I'm sure it's probably something simple that I've missed somewhere. If you need more information from the other files let me know, but this one seem the be the only one with the problem. I also know that there is unused variables that I've not removed yet.

result.setText((CharSequence) result);
This line cause Exception because you are casting Android View class to CharSequence Class.
Possible Solution:
Change return type of your method public TextView calculate() to
public String calculate()
Now in method public String calculate() return String of result fsal
And your button's Click() is something like,
calculate.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
//Toast.makeText(getApplicationContext(), (CharSequence) result, Toast.LENGTH_LONG).show();
String resultValue = "";
try {
resultValue = calculate();
} catch (Exception e) {
e.printStackTrace();
}
result.setText( resultValue);
}

result = (TextView) findViewById(R.id.buttonCylResult);
Are you casting properly? based on the naming, i would say that you are casting from a button to TextView. Try changing to,
result = (Button) findViewById(R.id.buttonCylResult);

Code keeps thowing a NPE, cannot find the cause

i cannot find the null pointer exception in my code, i was wondering if anyone could help me find what is giving an error.
code:
package com.dingle.ubat;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.os.PowerManager;
import android.view.Display;
import android.view.MotionEvent;
import android.widget.Toast;
public class UltraBrightAndroidTorchActivity extends Activity {
/** Called when the activity is first created. */
PowerManager pm;
PowerManager.WakeLock wl;
public boolean flash = false;
public boolean enableFlash = false;
public boolean dimDisplay = false;
Display display = getWindowManager().getDefaultDisplay();
public int windowWidth = display.getWidth();
public int windowHeight = display.getHeight();
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
wl = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK, "My Tag");
flash = this.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH);
if(flash == true && enableFlash == true){
try {
DroidLED led = new DroidLED();
led.enable(!led.isEnabled());
}
catch(Exception e) {
Toast.makeText(this, "Error interacting with LED.", Toast.LENGTH_SHORT).show();
throw new RuntimeException(e);
} }
wl.acquire();
}
#Override
public boolean onTouchEvent(MotionEvent event) {
//int tx = (int) event.getRawX();
int ty = (int) event.getRawY();
if (ty <= (windowHeight/2)){
dimDisplay = !dimDisplay;
}
if (ty >= (windowHeight/2)){
enableFlash = !enableFlash;
}
return super.onTouchEvent(event);
}
#Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
wl.release();
}
#Override
protected void onNewIntent(Intent intent) {
// TODO Auto-generated method stub
super.onNewIntent(intent);
wl.release();
}
#Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
wl.release();
}
#Override
protected void onStop() {
// TODO Auto-generated method stub
super.onStop();
wl.release();
}
}
Error list:
12-10 20:40:42.224: W/dalvikvm(274): threadid=3: thread exiting with uncaught exception (group=0x4001b188)
12-10 20:40:42.232: E/AndroidRuntime(274): Uncaught handler: thread main exiting due to uncaught exception
12-10 20:40:42.282: E/AndroidRuntime(274): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.dingle.ubat/com.dingle.ubat.UltraBrightAndroidTorchActivity}: java.lang.NullPointerException
12-10 20:40:42.282: E/AndroidRuntime(274): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2417)
12-10 20:40:42.282: E/AndroidRuntime(274): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512)
12-10 20:40:42.282: E/AndroidRuntime(274): at android.app.ActivityThread.access$2200(ActivityThread.java:119)
12-10 20:40:42.282: E/AndroidRuntime(274): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863)
12-10 20:40:42.282: E/AndroidRuntime(274): at android.os.Handler.dispatchMessage(Handler.java:99)
12-10 20:40:42.282: E/AndroidRuntime(274): at android.os.Looper.loop(Looper.java:123)
12-10 20:40:42.282: E/AndroidRuntime(274): at android.app.ActivityThread.main(ActivityThread.java:4363)
12-10 20:40:42.282: E/AndroidRuntime(274): at java.lang.reflect.Method.invokeNative(Native Method)
12-10 20:40:42.282: E/AndroidRuntime(274): at java.lang.reflect.Method.invoke(Method.java:521)
12-10 20:40:42.282: E/AndroidRuntime(274): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
12-10 20:40:42.282: E/AndroidRuntime(274): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
12-10 20:40:42.282: E/AndroidRuntime(274): at dalvik.system.NativeStart.main(Native Method)
12-10 20:40:42.282: E/AndroidRuntime(274): Caused by: java.lang.NullPointerException
12-10 20:40:42.282: E/AndroidRuntime(274): at com.dingle.ubat.UltraBrightAndroidTorchActivity.<init>(UltraBrightAndroidTorchActivity.java:20)
12-10 20:40:42.282: E/AndroidRuntime(274): at java.lang.Class.newInstanceImpl(Native Method)
12-10 20:40:42.282: E/AndroidRuntime(274): at java.lang.Class.newInstance(Class.java:1479)
12-10 20:40:42.282: E/AndroidRuntime(274): at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
12-10 20:40:42.282: E/AndroidRuntime(274): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2409)
12-10 20:40:42.282: E/AndroidRuntime(274): ... 11 more
any help and criticism is greatly appreciated
code is being compiled for android 2.1. code is a basic, crappily coded torch app.
thanx

The code is bailing out on one of these two lines:
Display display = getWindowManager().getDefaultDisplay();
public int windowWidth = display.getWidth();
Either getWindowManager() is returning a null and that first initializer will fail, or getDefaultDisplay() is, and the second one will.
You should probably move these initializations to the onCreate handler. Having them at instance initialization sounds a bit risky - the activity's "environment" might not be completely set up yet at that point.
(And check the return values.)

Activity is full available only after it has been created. This line does not do the intended purpose:
 Display display = getWindowManager().getDefaultDisplay();
Move this line and subsequent ones inside onCreate method.