Using Bitmap for saving image to Gallery in Android application with camera app

Question

I have problems when i use some code from Capture Image from Camera and Display in Activity and https://developer.android.com/training/camera/photobasics.html

First, this is in MainActivity.java. I create onClickevent when user press button "snap"

 Button snap = (Button) findViewById(R.id.button3);
    snap.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent start_cam = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
            File path = null;
            try {
                path = createImageFile();
            }
            catch(Exception e)
            {
                Toast.makeText(getApplicationContext(),e.toString(),Toast.LENGTH_LONG).show();
            }
            if(path!=null) {
                start_cam.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(path));
                startActivityForResult(start_cam, 1);
            }

        }

    });

Next, i add createImageFile() method

private File createImageFile() throws IOException {
    // Create an image file name
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
    String imageFileName = "JPEG_" + timeStamp + "_";
    File storageDir = Environment.getExternalStoragePublicDirectory(
            Environment.DIRECTORY_PICTURES);
    File image = File.createTempFile(
            imageFileName,  // prefix
            ".jpg",         // suffix
            storageDir      // directory
    );

    // Save a file: path for use with ACTION_VIEW intents
    root_file = "file:" + image.getAbsolutePath();
    return image;
}

Last part, I add onActivityResult()

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == 1 && resultCode == RESULT_OK) {
        try {
            m = MediaStore.Images.Media.getBitmap(this.getContentResolver(), Uri.parse(root_file));
            try {
                view.setImageBitmap(m);
            }
            catch(Exception e)
            {
                Toast.makeText(getApplicationContext(),e.toString(),Toast.LENGTH_LONG).show();

            }

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

I also add heading in my AndroidManifest.xml

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

After, i use this feature in android emulator API19 Nexus_one API19 (take a photo). The dialog appears and said "java.lang.nullPointerException".

I don't know why this problem appears. I think it may be my emulator or code.

@sasikumar Unfortunately, my android device is 4.2.2 ( My code sets for Kitkat or above) = . =a. Have you ever faced like this problem before? — Memory OfDream, Jan 18 '16 at 14:05
@sasikumar Thank you for your advice, i will try with real device. :) — Memory OfDream, Jan 18 '16 at 14:08
`and said "java.lang.nullPointerException".`. It not only said that. It also told you the line where the statement was that caused this exception. Don't trow away that importand info! DOuble click on the the logcat message and you will end up in the code. — greenapps, Jan 18 '16 at 14:09
@sasikumar about this Environment.getExternalStoragePublicDirectory( Environment.DIRECTORY_PICTURES); ?? — Memory OfDream, Jan 18 '16 at 14:10
@greenapps I find that it appear in view.setImageBitmap(m); ;( — Memory OfDream, Jan 18 '16 at 14:11
Ok. So then tell what you think is the pointer that is null.. — greenapps, Jan 18 '16 at 14:13
@greenapps According to Mr.sasikumar has faced, i think it's about my path ? — Memory OfDream, Jan 18 '16 at 14:15
No `view` is null. Try this: `if ( view==null) Toast( .,.."OMG view==null", ...)else view.setImageBitmap(m);`. — greenapps, Jan 18 '16 at 14:16
refer this you will get some idea http://www.limbaniandroid.com/2014/03/how-to-get-absolute-path-when-select.html — sasikumar, Jan 18 '16 at 14:16
Roger that, i will try and will be back for showing the result. :))) — Memory OfDream, Jan 18 '16 at 14:19
@greenapps yes, i use condition 'if(view==null)' and it appears OMGGGGGGG. for about path it shows '/storage/sdcard/Pictures/.......(file name).......jpg' — Memory OfDream, Jan 18 '16 at 14:29
@greenapps Ok, it shows in my first screen. Unfortunately, it isn't send to gallery in my android emulator = . = ... wahh, it may be new problem occure. — Memory OfDream, Jan 18 '16 at 15:00

Using Bitmap for saving image to Gallery in Android application with camera app

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