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POApp crashing while trying to take new photo
 

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  1. POApp crashing while trying to take new photo
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    <p>I am developing a customized camera app. when app starts camera opens there are three buttons at bottom. </p> <ol> <li>Capture (To take picture).</li> <li>Take New (return from preview to camera to take picture again.)</li> <li>Not using for anything.</li> </ol> <p>Everything works fine. pressing capture takes the picture and previews the taken picture accurately. But when I press take new button to come into camera mode from preview mode the app crashes don't have any idea what I am doing wrong. following is the code I am using. </p> <pre><code>public class MainActivity extends Activity { protected static final String TAG = null; private Camera mCamera; private CameraPreview mPreview; public static final int MEDIA_TYPE_IMAGE = 1; static int result; static int degrees = 90; private Button captureButton, btn_new; public FrameLayout preview; private static File mediaFile; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // Create an instance of Camera mCamera = getCameraInstance(); // Create our Preview view and set it as the content of our activity. mPreview = new CameraPreview(this, mCamera); FrameLayout preview = (FrameLayout) findViewById(R.id.camera_preview); preview.addView(mPreview); captureButton = (Button) findViewById(R.id.button_capture); captureButton.setOnClickListener( new View.OnClickListener() { @Override public void onClick(View v) { // get an image from the camera mCamera.takePicture(null, null, mPicture); } } ); btn_new = (Button) findViewById(R.id.button_new); btn_new.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { mCamera = getCameraInstance(); //preview = (FrameLayout) findViewById(R.id.camera_preview); //preview.addView(mPreview); } }); } private PictureCallback mPicture = new PictureCallback() { @Override public void onPictureTaken(byte[] data, Camera camera) { File pictureFile = getOutputMediaFile(MEDIA_TYPE_IMAGE); if (pictureFile == null){ return; } try { FileOutputStream fos = new FileOutputStream(pictureFile); fos.write(data); fos.close(); } catch (FileNotFoundException e) { Log.d(TAG, "File not found: " + e.getMessage()); } catch (IOException e) { Log.d(TAG, "Error accessing file: " + e.getMessage()); } } }; /** Create a File for saving an image or video */ private static File getOutputMediaFile(int type){ // To be safe, you should check that the SDCard is mounted // using Environment.getExternalStorageState() before doing this. File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM), "Camera"); // Create the storage directory if it does not exist if (! mediaStorageDir.exists()){ if (! mediaStorageDir.mkdirs()){ Log.d("MyCameraApp", "failed to create directory"); return null; } } // Create a media file name String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date()); if (type == MEDIA_TYPE_IMAGE){ mediaFile = new File(mediaStorageDir.getPath() + File.separator + "IMG_"+ timeStamp + ".jpg"); } else { return null; } return mediaFile; } @SuppressWarnings("null") public static Camera getCameraInstance(){ Camera c = null; Context context = null; try{ c = Camera.open(); //setCameraDisplayOrientation(MainActivity, 0, c); c.setDisplayOrientation(degrees); } catch (Exception e) { Toast.makeText(context.getApplicationContext(),"Camera is not available" , Toast.LENGTH_LONG).show(); } return c; } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.activity_main, menu); return true; } </code></pre> <p>}</p> <p>Thanks in Advance. Finally here is my error logcat:</p> <hr> <p>02-21 18:24:01.868: E/AndroidRuntime(937): FATAL EXCEPTION: main 02-21 18:24:01.868: E/AndroidRuntime(937): java.lang.NullPointerException 02-21 18:24:01.868: E/AndroidRuntime(937): at com.example.facebooktag.MainActivity.getCameraInstance(MainActivity.java:136) 02-21 18:24:01.868: E/AndroidRuntime(937): at com.example.facebooktag.MainActivity$3.onClick(MainActivity.java:66) 02-21 18:24:01.868: E/AndroidRuntime(937): at android.view.View.performClick(View.java:4202) 02-21 18:24:01.868: E/AndroidRuntime(937): at android.view.View$PerformClick.run(View.java:17340) 02-21 18:24:01.868: E/AndroidRuntime(937): at android.os.Handler.handleCallback(Handler.java:725) 02-21 18:24:01.868: E/AndroidRuntime(937): at android.os.Handler.dispatchMessage(Handler.java:92) 02-21 18:24:01.868: E/AndroidRuntime(937): at android.os.Looper.loop(Looper.java:137) 02-21 18:24:01.868: E/AndroidRuntime(937): at android.app.ActivityThread.main(ActivityThread.java:5039) 02-21 18:24:01.868: E/AndroidRuntime(937): at java.lang.reflect.Method.invokeNative(Native Method) 02-21 18:24:01.868: E/AndroidRuntime(937): at java.lang.reflect.Method.invoke(Method.java:511) 02-21 18:24:01.868: E/AndroidRuntime(937): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 02-21 18:24:01.868: E/AndroidRuntime(937): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 02-21 18:24:01.868: E/AndroidRuntime(937): at dalvik.system.NativeStart.main(Native Method)</p>
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    1. USnadeem gc
    1. USnadeem gc
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    1. COpost logcat here.
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      1. POApp crashing while trying to take new photo
      1. USAjay S
    2. COUnable to see anything in logcat have any suggestions?
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      1. USnadeem gc
    3. COYou'll need to get LogCat working first. Where are you running this application? If it is on device with no rear-facing camera, or emulator, you will likely get null back from Camera.open(). Thus, NullPointerException.
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      1. POApp crashing while trying to take new photo
      1. USJustin Jasmann
 

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