Getting Null pointer exception while capturing and saving an image using android emulator

Question

I am trying to capture and save an image through an Android emulator, image is being captured, but the file being saved is corrupted.

What could be causing this? can anyone help me identify possible error points?

Below is my code:

**public void onCreate**(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    **Intent** intent = new **Intent**("android.media.action.IMAGE_CAPTURE");
    try {
        fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE);
    } 

    catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    intent.putExtra(**MediaStore**.EXTRA_OUTPUT, fileUri);
    startActivityForResult(intent, CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE);
}

@Override
**protected void onActivityResult**(int requestCode, int resultCode, Intent data) {
    if (requestCode == CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE) {
        if (resultCode == RESULT_OK) {
            StoreImage(this, data.getData(),
            mediaFile);
            finish();
        } 

        else if (resultCode == RESULT_CANCELED) {
            // User cancelled the image capture
        } 

        else {
            finish();
            try {
            } 

            catch (Exception e) {
               e.printStackTrace();
            }
        }
    }

}

The Stack trace is below::

04-05 23:55:40.369: E/AndroidRuntime(534): FATAL EXCEPTION: main
04-05 23:55:40.369: E/AndroidRuntime(534): java.lang.RuntimeException: Unable to start activity ComponentInfo{camera.android/camera.android.CameraActivity}: java.lang.NullPointerException: file
04-05 23:55:40.369: E/AndroidRuntime(534):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1955)

04-05 23:55:40.369: E/AndroidRuntime(534): Caused by: java.lang.NullPointerException: file
04-05 23:55:40.369: E/AndroidRuntime(534):  at android.net.Uri.fromFile(Uri.java:441)
04-05 23:55:40.369: E/AndroidRuntime(534):  at camera.android.CameraActivity.getOutputMediaFileUri(CameraActivity.java:72)
04-05 23:55:40.369: E/AndroidRuntime(534):  at camera.android.CameraActivity.onCreate(CameraActivity.java:34)
04-05 23:55:40.369: E/AndroidRuntime(534):  at android.app.Activity.performCreate(Activity.java:4465)
04-05 23:55:40.369: E/AndroidRuntime(534):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
04-05 23:55:40.369: E/AndroidRuntime(534):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1919)

see my answer here if below solution is not for you: http://stackoverflow.com/questions/31334378/null-pointer-exception-on-file-uri/43228221#43228221 — temirbek, Apr 05 '17 at 10:15

score 4 · Answer 1 · answered Apr 05 '12 at 04:44

Interchange this line,

if (requestCode == CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE) {
                if (resultCode == RESULT_OK) {

to

 if (resultCode == RESULT_OK) {
                    if (requestCode == CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE) {

First check whether the child activity is done its work successfully or not.

score 4 · Accepted Answer · edited Apr 06 '12 at 18:24

4

check whether you added the below permission in manifest file::

<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.CAMERA" />

also in the

fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE);

I think you must attach the file name that you want to save too, and giving only the path is not enough....

edited Apr 06 '12 at 18:24

Kayhan Asghari

2,817
1
28
47

answered Apr 05 '12 at 05:49

Shankar Agarwal

34,573
7
66
64

In the function getOutputMediaFileUri(MEDIA_TYPE_IMAGE), I have defined the path where the file is being saved, File f = new File(Environment.getExternalStorageDirectory(),"IMG_" + timeStamp + ".jpg") – Kanika Maheshwari Apr 06 '12 at 06:49
check whether fileUri is null or not. and also what is StoreImage(this, data.getData(), mediaFile); – Shankar Agarwal Apr 06 '12 at 07:51
My file is being created, but it dosen't contain the image. It is corrupted – Kanika Maheshwari Apr 06 '12 at 08:31

score 1 · Answer 3 · answered Apr 06 '12 at 08:28

"@ Agarwal : on calling the onActivityResult"

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE) {
            if (resultCode == RESULT_OK) {
                StoreImage(this, data.getData(), mediaFile);
                finish();

            } else if (resultCode == RESULT_CANCELED) {
                // User cancelled the image capture
            } else {
                finish();
                try {

                } catch (Exception e) {
                    e.printStackTrace();
                }
            }

        }

    }

"If the result is success, then the data from intern is stored n file which is created and saved as jpeg format"

public static void StoreImage(Context mContext, Uri imageLoc, File imageDir) {
        Bitmap bm = null;
        try {
            bm = Media.getBitmap(mContext.getContentResolver(), imageLoc);
            FileOutputStream out = new FileOutputStream(imageDir);
            bm.compress(Bitmap.CompressFormat.JPEG, 100, out);
            bm.recycle();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}

score 0 · Answer 4 · answered Mar 18 '14 at 10:21

try below code,

Intent i = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);

    File file=getOutputMediaFile(1);
    picUri = Uri.fromFile(file); // create
    i.putExtra(MediaStore.EXTRA_OUTPUT,picUri); // set the image file

    startActivityForResult(i, CAPTURE_IMAGE);

where getOutputMediaFile(int) will be,

/** Create a File for saving an image */
private  File getOutputMediaFile(int type){
    File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
              Environment.DIRECTORY_PICTURES), "MyApplication");

    /**Create the storage directory if it does not exist*/
    if (! mediaStorageDir.exists()){
        if (! mediaStorageDir.mkdirs()){
            return null;
        }
    }

    /**Create a media file name*/
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    File mediaFile;
    if (type == 1){
        mediaFile = new File(mediaStorageDir.getPath() + File.separator +
        "IMG_"+ timeStamp + ".png");
    } else {
        return null;
    }

    return mediaFile;
}

and finally,

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (resultCode == Activity.RESULT_OK) {
        Intent i;
        switch (requestCode) {
        case CAPTURE_IMAGE:
            //THIS IS YOUR Uri
            Uri uri=picUri; 
            break;
        }
    }   
}

cheers....:)

Getting Null pointer exception while capturing and saving an image using android emulator

4 Answers4

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