無法按隨機順序恢復活動

我試圖從相機的快照，然後使用OpenCV的處理吧！但有時（排名不分先後）我得到以下異常

9 18:54:33.659: E/AndroidRuntime(16625): FATAL EXCEPTION: main 
12-19 18:54:33.659: E/AndroidRuntime(16625): java.lang.RuntimeException: Unable to resume activity {com.example.superemr/com.example.superemr.MainActivity}: java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=11, result=-1, data=Intent { act=inline-data dat=file:///mnt/sdcard/Pictures/IDSMART/IDS-1607435583.jpg typ=image/jpeg (has extras) }} to activity {com.example.superemr/com.example.superemr.MainActivity}: java.lang.NullPointerException 
12-19 18:54:33.659: E/AndroidRuntime(16625): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2464) 
12-19 18:54:33.659: E/AndroidRuntime(16625): at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2492) 
12-19 18:54:33.659: E/AndroidRuntime(16625): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1997) 
12-19 18:54:33.659: E/AndroidRuntime(16625): at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3371) 
12-19 18:54:33.659: E/AndroidRuntime(16625): at android.app.ActivityThread.access$700(ActivityThread.java:127) 
12-19 18:54:33.659: E/AndroidRuntime(16625): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1162) 
12-19 18:54:33.659: E/AndroidRuntime(16625): at android.os.Handler.dispatchMessage(Handler.java:99) 
12-19 18:54:33.659: E/AndroidRuntime(16625): at android.os.Looper.loop(Looper.java:137) 
12-19 18:54:33.659: E/AndroidRuntime(16625): at android.app.ActivityThread.main(ActivityThread.java:4441) 
12-19 18:54:33.659: E/AndroidRuntime(16625): at java.lang.reflect.Method.invokeNative(Native Method) 
12-19 18:54:33.659: E/AndroidRuntime(16625): at java.lang.reflect.Method.invoke(Method.java:511) 
12-19 18:54:33.659: E/AndroidRuntime(16625): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
12-19 18:54:33.659: E/AndroidRuntime(16625): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
12-19 18:54:33.659: E/AndroidRuntime(16625): at dalvik.system.NativeStart.main(Native Method) 
12-19 18:54:33.659: E/AndroidRuntime(16625): Caused by: java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=11, result=-1, data=Intent { act=inline-data dat=file:///mnt/sdcard/Pictures/IDSMART/IDS-1607435583.jpg typ=image/jpeg (has extras) }} to activity {com.example.superemr/com.example.superemr.MainActivity}: java.lang.NullPointerException 
12-19 18:54:33.659: E/AndroidRuntime(16625): at android.app.ActivityThread.deliverResults(ActivityThread.java:3000) 
12-19 18:54:33.659: E/AndroidRuntime(16625): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2451) 
12-19 18:54:33.659: E/AndroidRuntime(16625): ... 13 more 
12-19 18:54:33.659: E/AndroidRuntime(16625): Caused by: java.lang.NullPointerException 
12-19 18:54:33.659: E/AndroidRuntime(16625): at com.example.superemr.MainActivity.onActivityResult(MainActivity.java:88) 
12-19 18:54:33.659: E/AndroidRuntime(16625): at android.app.Activity.dispatchActivityResult(Activity.java:4649) 
12-19 18:54:33.659: E/AndroidRuntime(16625): at android.app.ActivityThread.deliverResults(ActivityThread.java:2996) 
12-19 18:54:33.659: E/AndroidRuntime(16625): ... 14 more

當我嘗試調試問題通常是節目成功，但有時也與之前的onResume被調用拋出一個異常！

public void onResume() 
{ 
    super.onResume(); 
    if(!OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_3, this, mLoaderCallback)) 
     Toast.makeText(this, "cannot connect to opencv ",Toast.LENGTH_SHORT).show(); 
} 


public void cap(View view) 
{ 
    Intent camInt = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 
     List<ResolveInfo> aa = getPackageManager().queryIntentActivities(
     camInt, PackageManager.MATCH_DEFAULT_ONLY); 

     if (aa != null && aa.size() > 0) { 
     File dir = new File(
     android.os.Environment 
      .getExternalStoragePublicDirectory(android.os.Environment.DIRECTORY_PICTURES), 
     "IDSMART"); 

     if (!dir.exists()) { 
     boolean result = dir.mkdirs(); 
     Log.d("Creating Dirs Result:", 
      result ? "Create have been Done :)" 
      : "Create have not been done :("); 
     } 
     Random r = new Random(); 
     file = new File(dir, String.format("IDS%s.jpg", r.nextInt())); 
     camInt.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(file)); 
     startActivityForResult(camInt, CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE); 
     } 
}

強大的文本

來源

2012-12-19 Yamen Ajjour

的問題是在你的onActivityResult：'在com.example.superemr.MainActivity.onActivityResult（MainActivity.java:88）'，只是檢查空值。 – dmon

如果你需要幫助，你應該發佈你的'onActivityResult'代碼。 – toadzky

在你onActivityResult，請檢查數據（意向）爲空。
如果您在獲取NullPointerException時嘗試訪問數據。
如果條件滿足，請嘗試以下操作。

void onActivityResult(int requestCode, int resultCode, Intent data) 
{ 

     if((resultCode == Activity.RESULT_OK) && (data != null)) 
     { 
       // Do whatever you want here. 

     } 
}

來源

2013-01-02 16:28:03

無法按隨機順序恢復活動

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