Taking a screenshot of current Activity in Android

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http://androidresearch.wordpress.com/2013/01/06/taking-a-screenshot-of-current-activity-in-android/

In this post I’ll show how you can take a screenshot of your current Activity and save the resulting image on /sdcard.

The idea behind taking a screenshot actually is pretty simple: what we need to do is to get a reference of the root view and generate a bitmap copy of this view.

screenshot

Considering that we want to take the screenshot when a button is clicked, the code will look like this:

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findViewById(R.id.button1).setOnClickListener(newOnClickListener() {
   @Override
   publicvoid onClick(View v) {
       Bitmap bitmap = takeScreenshot();
       saveBitmap(bitmap);
   }
});

First of all we should retrieve the topmost view in the current view hierarchy, then enable the drawing cache, and after that call getDrawingCache().

Calling getDrawingCache(); will return the bitmap representing the view or null if cache is disabled, that’s why setDrawingCacheEnabled(true); should be set to true prior invoking getDrawingCache().

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publicBitmap takeScreenshot() {
   View rootView = findViewById(android.R.id.content).getRootView();
   rootView.setDrawingCacheEnabled(true);
   returnrootView.getDrawingCache();
}

And the method that saves the bitmap image to external storage:

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publicvoid saveBitmap(Bitmap bitmap) {
    File imagePath =new File(Environment.getExternalStorageDirectory() + "/screenshot.png");
    FileOutputStream fos;
    try{
        fos =new FileOutputStream(imagePath);
        bitmap.compress(CompressFormat.JPEG,100, fos);
        fos.flush();
        fos.close();
    }catch (FileNotFoundException e) {
        Log.e("GREC", e.getMessage(), e);
    }catch (IOException e) {
        Log.e("GREC", e.getMessage(), e);
    }
}

Since the image is saved on external storage, the WRITE_EXTERNAL_STORAGE permission should be added AndroidManifest to file:

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<uses-permissionandroid:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

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