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POApplication Crashes while changing activities
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copied!<p>I've been working on support for multiple screens in my app. However, when my screen is detected as a 480x800 screen, it switches to the Activity for that resolution, but at that point it crashes...</p> <p>This is the detect.java, where It makes a decision based on the screen resolution:</p> <pre><code>package com.example.mywallpapers; import android.app.Activity; import android.content.Intent; import android.graphics.Point; import android.os.Build; import android.os.Bundle; import android.view.Display; import android.view.WindowManager; public class Detect extends Activity { @SuppressWarnings("deprecation") @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); int width = 0; Point size = new Point(); WindowManager w = getWindowManager(); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) { w.getDefaultDisplay().getSize(size); width = size.x; } else { Display d = w.getDefaultDisplay(); width = d.getWidth(); } if (width == 480) { startActivity(new Intent(Detect.this, SevenTwentyOne.class)); } else if (width == 720) { startActivity(new Intent("com.example.mywallpapers.FOUREIGHTONE")); } else { startActivity(new Intent("com.example.mywallpapers.FOUREIGHTONE")); } } } </code></pre> <p>This is my SevenTwentyOne class (which isn't for the 1280x720 resolution, but for the 480x800)</p> <pre><code>package com.example.mywallpapers; import java.io.IOException; import android.app.Activity; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.media.MediaPlayer; import android.os.Bundle; import android.view.Gravity; import android.view.View; import android.widget.Button; import android.widget.ImageView; import android.widget.Toast; import com.mopub.mobileads.MoPubView; public class SevenTwentyOne extends Activity { ImageView display; int toPhone; private MoPubView mAdView; MediaPlayer knopje; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.foureightyeighthundredeen); mAdView = (MoPubView) findViewById(R.id.adview); mAdView.setAdUnitId("e95a36beb72611e281c11231392559e4"); // Enter your // Ad Unit // ID from // www.mopub.com mAdView.loadAd(); display = (ImageView) findViewById(R.id.WaP49); Button image1 = (Button) findViewById(R.id.WaP50); Button image2 = (Button) findViewById(R.id.WaP51); Button image3 = (Button) findViewById(R.id.WaP52); Button image4 = (Button) findViewById(R.id.WaP53); Button image5 = (Button) findViewById(R.id.WaP54); Button image6 = (Button) findViewById(R.id.WaP55); Button image7 = (Button) findViewById(R.id.WaP56); Button image8 = (Button) findViewById(R.id.WaP57); Button image9 = (Button) findViewById(R.id.WaP58); Button image10 = (Button) findViewById(R.id.WaP59); Button image11 = (Button) findViewById(R.id.WaP60); Button image12 = (Button) findViewById(R.id.WaP61); Button image13 = (Button) findViewById(R.id.WaP62); Button image14 = (Button) findViewById(R.id.WaP63); Button image15 = (Button) findViewById(R.id.WaP64); Button image16 = (Button) findViewById(R.id.WaP65); Button image17 = (Button) findViewById(R.id.WaP66); Button image18 = (Button) findViewById(R.id.WaP67); Button image19 = (Button) findViewById(R.id.WaP68); Button image20 = (Button) findViewById(R.id.WaP69); Button image21 = (Button) findViewById(R.id.WaP70); Button image22 = (Button) findViewById(R.id.WaP71); Button image23 = (Button) findViewById(R.id.WaP72); Button image24 = (Button) findViewById(R.id.WaP73); Button image25 = (Button) findViewById(R.id.WaP74); Button image26 = (Button) findViewById(R.id.WaP75); Button image27 = (Button) findViewById(R.id.WaP76); Button image28 = (Button) findViewById(R.id.WaP77); Button image29 = (Button) findViewById(R.id.WaP78); Button image30 = (Button) findViewById(R.id.WaP79); Button image31 = (Button) findViewById(R.id.WaP80); Button image32 = (Button) findViewById(R.id.WaP81); Button image33 = (Button) findViewById(R.id.WaP82); Button image34 = (Button) findViewById(R.id.WaP83); Button image35 = (Button) findViewById(R.id.WaP84); Button image36 = (Button) findViewById(R.id.WaP85); Button image37 = (Button) findViewById(R.id.WaP86); Button image38 = (Button) findViewById(R.id.WaP87); Button image39 = (Button) findViewById(R.id.WaP88); Button image40 = (Button) findViewById(R.id.WaP89); Button image41 = (Button) findViewById(R.id.WaP90); Button image42 = (Button) findViewById(R.id.WaP91); Button image43 = (Button) findViewById(R.id.WaP92); Button image44 = (Button) findViewById(R.id.WaP93); Button image45 = (Button) findViewById(R.id.WaP94); Button image46 = (Button) findViewById(R.id.WaP95); Button image47 = (Button) findViewById(R.id.WaP96); Button setWall = (Button) findViewById(R.id.SetWallPaperButton); toPhone = R.drawable.a_aardbeien; knopje = MediaPlayer.create(getApplicationContext(), R.raw.button); image1.setOnClickListener(new View.OnClickListener() { // Line 90 @Override public void onClick(View arg0) { display.setImageResource(R.drawable.aardmannetje); toPhone = R.drawable.a_aardmannetje; knopje.start(); } }); image2.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.aardbeien); toPhone = R.drawable.a_aardbeien; knopje.start(); } }); image3.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.android); toPhone = R.drawable.a_android; knopje.start(); } }); image4.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.batman); toPhone = R.drawable.a_batman; knopje.start(); } }); image5.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.bij); toPhone = R.drawable.a_bij; knopje.start(); } }); image6.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.blaadjes); toPhone = R.drawable.a_blaadjes; knopje.start(); } }); image7.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.bliksem); toPhone = R.drawable.a_bliksem; knopje.start(); } }); image8.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.bloemblaadjes); toPhone = R.drawable.a_bloemblaadjes; knopje.start(); } }); image9.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.bloemetjes); toPhone = R.drawable.a_bloemetjes; knopje.start(); } }); image10.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.blokjes); toPhone = R.drawable.a_blokjes; knopje.start(); } }); image11.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.bubbels); toPhone = R.drawable.a_bubbels; knopje.start(); } }); image12.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.chocolade); toPhone = R.drawable.a_chocolade; knopje.start(); } }); image13.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.closeuproos); toPhone = R.drawable.a_closeuproos; knopje.start(); } }); image14.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.druppels); toPhone = R.drawable.a_druppels; knopje.start(); } }); image15.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.duinen); toPhone = R.drawable.a_duinen; knopje.start(); } }); image16.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.frambozen); toPhone = R.drawable.a_frambozen; knopje.start(); } }); image17.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.gekleurdeblokjes); toPhone = R.drawable.a_gekleurdeblokjes; knopje.start(); } }); image18.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.gekleurdeballetjes); toPhone = R.drawable.a_gekleurderondjes; knopje.start(); } }); image19.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.gekleurderoos); toPhone = R.drawable.a_gekleurderoos; knopje.start(); } }); image20.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.geld); toPhone = R.drawable.a_geld; knopje.start(); } }); image21.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.gitaar); toPhone = R.drawable.a_gitaar; knopje.start(); } }); image22.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.graslucht); toPhone = R.drawable.a_luchtgras; knopje.start(); } }); image23.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.hartjes); toPhone = R.drawable.a_hartjes; knopje.start(); } }); image24.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.hartjesdruppel); toPhone = R.drawable.a_hartjesdruppel; knopje.start(); } }); image25.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.ijsjes); toPhone = R.drawable.a_ijsjes; knopje.start(); } }); image26.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.jellybeans); toPhone = R.drawable.a_jellybeans; knopje.start(); } }); image27.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.kerstballen); toPhone = R.drawable.a_kerstballen; knopje.start(); } }); image28.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.kleurenspiraal); toPhone = R.drawable.a_kleurenspiraal; knopje.start(); } }); image29.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.kleurenhout); toPhone = R.drawable.a_kleurhout; knopje.start(); } }); image30.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.kleurstrepen); toPhone = R.drawable.a_kleurstrepen; knopje.start(); } }); image31.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.kunst); toPhone = R.drawable.a_kunst; knopje.start(); } }); image32.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.lente); toPhone = R.drawable.a_lente; knopje.start(); } }); image33.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.muziek); toPhone = R.drawable.a_muziek; knopje.start(); } }); image34.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.panterprint); toPhone = R.drawable.a_panterprint; knopje.start(); } }); image35.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.parijs); toPhone = R.drawable.a_parijs; knopje.start(); } }); image36.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.piano); toPhone = R.drawable.a_piano; knopje.start(); } }); image37.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.rozen); toPhone = R.drawable.a_rozen; knopje.start(); } }); image38.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.rozepaarsebloemetjes); toPhone = R.drawable.a_rozepaarsebloemetjes; knopje.start(); } }); image39.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.stenen); toPhone = R.drawable.a_stenen; knopje.start(); } }); image40.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.strand); toPhone = R.drawable.a_strand; knopje.start(); } }); image41.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.streepjes); toPhone = R.drawable.a_streepjes; knopje.start(); } }); image42.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.struik); toPhone = R.drawable.a_struik; knopje.start(); } }); image43.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.tjahoezullenwehetnoemen); toPhone = R.drawable.a_tjahoezullenwehetnoemen; knopje.start(); } }); image44.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.tulpen); toPhone = R.drawable.a_tulpen; knopje.start(); } }); image45.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.veren); toPhone = R.drawable.a_veren; knopje.start(); } }); image46.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.watermannetje); toPhone = R.drawable.a_watermannetje; knopje.start(); } }); image47.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { display.setImageResource(R.drawable.zwartwit); toPhone = R.drawable.a_zwartwit; knopje.start(); } }); setWall.setOnClickListener(new View.OnClickListener() { @SuppressWarnings("deprecation") @Override public void onClick(View arg0) { Bitmap whatever = BitmapFactory.decodeStream(getResources() .openRawResource(toPhone)); try { getApplicationContext().setWallpaper(whatever); } catch (IOException e) { e.printStackTrace(); } finally {knopje.start(); Toast my_toast = Toast.makeText(getApplicationContext(), "Wallpaper Set!", Toast.LENGTH_SHORT); my_toast.setGravity(Gravity.CENTER, 0, 0); my_toast.show();; } } }); }; @Override protected void onPause() { // TODO Auto-generated method stub super.onPause(); mAdView.destroy(); } @Override protected void onDestroy() { super.onDestroy(); mAdView.destroy(); } @Override protected void onResume() { // TODO Auto-generated method stub super.onResume(); mAdView = (MoPubView) findViewById(R.id.adview); mAdView.setAdUnitId("e95a36beb72611e281c11231392559e4"); // Enter your // Ad Unit // ID from // www.mopub.com mAdView.loadAd(); } } </code></pre> <p>Whenever I test my app on an 480x800 phone, it crashes with an NullPointerExeption. Any idea where that one might come from?</p> <p>This is the logCat: </p> <pre><code>05-15 11:27:47.600: E/AndroidRuntime(31642): FATAL EXCEPTION: main 05-15 11:27:47.600: E/AndroidRuntime(31642): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.mywallpapers/com.example.mywallpapers.SevenTwentyOne}: java.lang.NullPointerException 05-15 11:27:47.600: E/AndroidRuntime(31642): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2100) 05-15 11:27:47.600: E/AndroidRuntime(31642): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2125) 05-15 11:27:47.600: E/AndroidRuntime(31642): at android.app.ActivityThread.access$600(ActivityThread.java:140) 05-15 11:27:47.600: E/AndroidRuntime(31642): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1227) 05-15 11:27:47.600: E/AndroidRuntime(31642): at android.os.Handler.dispatchMessage(Handler.java:99) 05-15 11:27:47.600: E/AndroidRuntime(31642): at android.os.Looper.loop(Looper.java:137) 05-15 11:27:47.600: E/AndroidRuntime(31642): at android.app.ActivityThread.main(ActivityThread.java:4898) 05-15 11:27:47.600: E/AndroidRuntime(31642): at java.lang.reflect.Method.invokeNative(Native Method) 05-15 11:27:47.600: E/AndroidRuntime(31642): at java.lang.reflect.Method.invoke(Method.java:511) 05-15 11:27:47.600: E/AndroidRuntime(31642): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1008) 05-15 11:27:47.600: E/AndroidRuntime(31642): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:775) 05-15 11:27:47.600: E/AndroidRuntime(31642): at dalvik.system.NativeStart.main(Native Method) 05-15 11:27:47.600: E/AndroidRuntime(31642): Caused by: java.lang.NullPointerException 05-15 11:27:47.600: E/AndroidRuntime(31642): at com.example.mywallpapers.SevenTwentyOne.onCreate(SevenTwentyOne.java:90) 05-15 11:27:47.600: E/AndroidRuntime(31642): at android.app.Activity.performCreate(Activity.java:5206) 05-15 11:27:47.600: E/AndroidRuntime(31642): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094) 05-15 11:27:47.600: E/AndroidRuntime(31642): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2064) 05-15 11:27:47.600: E/AndroidRuntime(31642): ... 11 more </code></pre>

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