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POAndroid: startActivityForResult always null and force close my app
 

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  1. POAndroid: startActivityForResult always null and force close my app
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    <p>I have the following scenario which is quite pulling my hairs out: I'm writing a class to manage the Android camera, which extends Activity. Inside that class I have the code below. What happens is that I always get null point exception --with its force close little friend-- in the line that says:</p> <pre><code>startActivityForResult(intent, 0); </code></pre> <p>However I get System.out.println("intent not null"); printed ok in LogCat...</p> <p>The LogCat says:</p> <pre><code>03-08 22:46:38.584: ERROR/AndroidRuntime(1079): java.lang.NullPointerException 03-08 22:46:38.584: ERROR/AndroidRuntime(1079): at android.app.Activity.startActivityForResult(Activity.java:2749) 03-08 22:46:38.584: ERROR/AndroidRuntime(1079): at com.test.cameratest.startCameraActivity(cameratest.java:39) </code></pre> <p>In the manifest I have:</p> <pre><code>&lt;uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /&gt; &lt;uses-permission android:name="android.permission.CAMERA" /&gt; &lt;uses-feature android:name="android.hardware.camera"/&gt; &lt;activity android:name=".cameratest" /&gt; </code></pre> <p><strong>So, what I'm doing wrong?? Why startActivityForResult always throws null!?</strong></p> <pre><code>@Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); } /** As per suggestion tried to change the method from protected to private or public but still have the same problem */ protected void startCameraActivity() { String path = (new StringBuilder()).append(Environment.getExternalStorageDirectory()).append("/images/test.jpg").toString(); System.out.println("started"); File file = new File(path); System.out.println(path); Uri outputFileUri = Uri.fromFile(file); Intent intent = new Intent("android.media.action.IMAGE_CAPTURE"); intent.putExtra("output", outputFileUri); /** Removed as per suggestion if (intent!=null) { System.out.println("intent not null"); **startActivityForResult(intent, 0);** } */ **startActivityForResult(intent, 0);** &lt;== null pointer exception } </code></pre> <p><strong>EDITED:</strong></p> <p>As per suggestion, I took a look to line 2749 on Activity.java from Android 2.1r2 framework and here is the code:</p> <pre><code>public void startActivityForResult(Intent intent, int requestCode) { if (mParent == null) { **** Line 2749 is the folowing Instrumentation.ActivityResult ar = mInstrumentation.execStartActivity( this, mMainThread.getApplicationThread(), mToken, this, intent, requestCode); **** if (ar != null) { mMainThread.sendActivityResult( mToken, mEmbeddedID, requestCode, ar.getResultCode(), ar.getResultData()); } if (requestCode &gt;= 0) { // If this start is requesting a result, we can avoid making // the activity visible until the result is received. Setting // this code during onCreate(Bundle savedInstanceState) or onResume() will keep the // activity hidden during this time, to avoid flickering. // This can only be done when a result is requested because // that guarantees we will get information back when the // activity is finished, no matter what happens to it. mStartedActivity = true; } } else { mParent.startActivityFromChild(this, intent, requestCode); } } </code></pre> <p>Line 2749 is marked with double ** However, I don't see a problem with that code </p> <p><strong>EDITED</strong></p> <p>Forgot to explain how I call this:</p> <pre><code>cameratest cam = new cameratest(); cam.startCameraActivity(); </code></pre>
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    1. USAram Alvarez
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    1. COSince you got past `intent.putExtra(...)`, checking `intent!=null` is kind of useless. That's not the problem. I'd look at Activity.java line 2749 for the OS version you're using. That might provide a hint. You can find the framework sources [here](http://android.git.kernel.org/?p=platform/frameworks/base.git;a=summary)
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      1. POAndroid: startActivityForResult always null and force close my app
      1. USTed Hopp
    2. COThank you Ted, however I don't see a problem there neither, or as far as I can tell. I also found out that, no matter what activity I want to start, it always throw me a null exception error. I tried with snippets for getting the contacts and dialing a number...
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      1. POAndroid: startActivityForResult always null and force close my app
      1. USAram Alvarez
    3. COI think problem may due to the method which is `protected`.Try making it `private`
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      1. POAndroid: startActivityForResult always null and force close my app
      1. USShashank_Itmaster
 

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