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POtake a screenshot from the activity
 

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    <p>I am trying to use this code to take a screenshot from the activity but I am getting a java.lang.nullpointerexception at a line with the code:</p> <pre><code>Bitmap b = Bitmap.createBitmap(view.getDrawingCache(), 0, statusBarHeight, width, height - statusBarHeight) </code></pre> <p>and when I tried to debug I found that all the variables are not able to resolve; i.e., statusBarHeight, width, height. Please help me in resolving this.</p> <pre><code>Activity av; View view; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); view = (View)findViewById(R.id.screen); av= HelloAndroidActivity.this; try { takeScreenShot(av); } catch (Exception e) { } } public void takeScreenShot(Activity av) throws Exception { view =this.getWindow().getDecorView(); //or //view =av.getWindow().getDecorView(); view.setDrawingCacheEnabled(true); view.buildDrawingCache(true); Bitmap b1 = view.getDrawingCache(); Rect frame = new Rect(); this.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame); int statusBarHeight = frame.top; int width = this.getWindowManager().getDefaultDisplay().getWidth(); int height = this.getWindowManager().getDefaultDisplay().getHeight(); Bitmap b = Bitmap.createBitmap(view.getDrawingCache(), 0, statusBarHeight, width, height - statusBarHeight); view.destroyDrawingCache(); FileOutputStream fos = null; try { //File sddir = new File(path, name); File root = Environment.getExternalStorageDirectory(); //s= sddir.toString(); Toast.makeText(this, "path " + root, Toast.LENGTH_LONG).show(); if (!root.exists()) { root.mkdirs(); } fos = new FileOutputStream(root+ "/Image" + "_" + "4" + ".jpeg"); if (fos != null) { b.compress(Bitmap.CompressFormat.JPEG, 90, fos); fos.flush(); fos.close(); } } catch (Exception e) { Toast.makeText(this, "Exception " + e, Toast.LENGTH_LONG).show(); Log.e("Exception occurred while moving image: ", e.toString()); e.printStackTrace(); } } </code></pre>
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