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POError when i try launching my android aplication (A viewFlipper)
 

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  1. POError when i try launching my android aplication (A viewFlipper)
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    <p>I have made an app which takes the photos from the SDcard and puts them on a <code>ViewFlipper</code>, but when i launch it, it suddenly stops. </p> <p>I have no errors in eclipse(ițs an android app). </p> <p>Here is the java code: </p> <pre><code>public class Images extends Activity implements OnClickListener { static Button btnNext; static Button btnBack; static ViewFlipper Flipper; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.images); final File f = new File(Environment.getExternalStorageDirectory().getPath()+"/images"); btnNext= (Button) findViewById(R.id.btn_plus); btnBack= (Button) findViewById (R.id.btn_minus); Flipper=(ViewFlipper) findViewById (R.id.flipper); btnNext.setOnClickListener(this); btnBack.setOnClickListener(this); final int imageCount = f.listFiles().length; for (int count = 0; count &lt; imageCount - 1; count++) { ImageView imageView = new ImageView(this); Bitmap bmp = BitmapFactory.decodeFile(f.listFiles()[count].getAbsolutePath()); imageView.setImageBitmap(bmp); Flipper.addView(imageView); } } @Override public void onClick(View arg0) { // TODO Auto-generated method stub switch (arg0.getId()){ case(R.id.btn_minus): Flipper.showPrevious(); break; case(R.id.btn_plus): Flipper.showNext(); break; } } } </code></pre> <p>here is the logcat:</p> <pre><code>06-01 08:22:29.418: E/AndroidRuntime(912): FATAL EXCEPTION: main 06-01 08:22:29.418: E/AndroidRuntime(912): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.tendarius.voicebrowser/com.tendarius.voicebrowser.Images}: java.lang.NullPointerException 06-01 08:22:29.418: E/AndroidRuntime(912): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180) 06-01 08:22:29.418: E/AndroidRuntime(912): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 06-01 08:22:29.418: E/AndroidRuntime(912): at android.app.ActivityThread.access$600(ActivityThread.java:141) 06-01 08:22:29.418: E/AndroidRuntime(912): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 06-01 08:22:29.418: E/AndroidRuntime(912): at android.os.Handler.dispatchMessage(Handler.java:99) 06-01 08:22:29.418: E/AndroidRuntime(912): at android.os.Looper.loop(Looper.java:137) 06-01 08:22:29.418: E/AndroidRuntime(912): at android.app.ActivityThread.main(ActivityThread.java:5041) 06-01 08:22:29.418: E/AndroidRuntime(912): at java.lang.reflect.Method.invokeNative(Native Method) 06-01 08:22:29.418: E/AndroidRuntime(912): at java.lang.reflect.Method.invoke(Method.java:511) 06-01 08:22:29.418: E/AndroidRuntime(912): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 06-01 08:22:29.418: E/AndroidRuntime(912): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 06-01 08:22:29.418: E/AndroidRuntime(912): at dalvik.system.NativeStart.main(Native Method) 06-01 08:22:29.418: E/AndroidRuntime(912): Caused by: java.lang.NullPointerException 06-01 08:22:29.418: E/AndroidRuntime(912): at com.tendarius.voicebrowser.Images.onCreate(Images.java:36) 06-01 08:22:29.418: E/AndroidRuntime(912): at android.app.Activity.performCreate(Activity.java:5104) 06-01 08:22:29.418: E/AndroidRuntime(912): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 06-01 08:22:29.418: E/AndroidRuntime(912): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144) 06-01 08:22:29.418: E/AndroidRuntime(912): ... 11 more </code></pre>
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USDaniel Darius
    1. USDaniel Darius
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
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      1. PTAnswer
    1. VO
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      1. POError when i try launching my android aplication (A viewFlipper)
      1. This table or related slice is empty.
      1. VTApproveEditSuggestion
    1. COmake sure you have added SD-CARD permissions in AndroidManifest ?
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      1. POError when i try launching my android aplication (A viewFlipper)
      1. USρяσѕρєя K
    2. COdo you really need the imports and empty lines in the question ?
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      1. POError when i try launching my android aplication (A viewFlipper)
      1. USSiddharth
    3. CO1. No errors in Eclipse is meaningless, since you cannot run your app if you have any and, you cannot get runtime errors until you fix compile time errors. 2. Please always post the logcat stack trace when asking about exceptions. 3. You should learn how to read logcat and how to use the debugger then this problem would be very easy for you to find.
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      1. POError when i try launching my android aplication (A viewFlipper)
      1. USSimon
 

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