Demo activity for question asked in https://github.com/mtsahakis/MediaProjectionDemo/issues/7

ScreenCaptureActivity.java

package com.mtsahakis.activity;

import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.media.projection.MediaProjectionManager;
import android.os.Bundle;

@TargetApi(21)
public class ScreenCaptureActivity extends Activity {
	
	private static final int 	REQUEST_CODE_SCREEN_CAPTURE = 100;
	private static final String 	STATE_RESULT_CODE 			= "result_code";
  private static final String 	STATE_RESULT_DATA 			= "result_data";
	
	private int 	  mResultCode;
  private Intent 	mResultData;
	
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		if (savedInstanceState != null) {
      mResultCode = savedInstanceState.getInt(STATE_RESULT_CODE);
      mResultData = savedInstanceState.getParcelable(STATE_RESULT_DATA);
    } else {
		  MediaProjectionManager projectionManager = (MediaProjectionManager) getApplicationContext().
							getSystemService(Context.MEDIA_PROJECTION_SERVICE);
			startActivityForResult(projectionManager.createScreenCaptureIntent(), REQUEST_CODE_SCREEN_CAPTURE);
		}
	}
	
	@Override
	public void onSaveInstanceState(Bundle outState) {
		super.onSaveInstanceState(outState);
		if (mResultData != null) {
		  outState.putInt(STATE_RESULT_CODE, mResultCode);
			outState.putParcelable(STATE_RESULT_DATA, mResultData);
		}
	}

	@Override
	public void onActivityResult(int requestCode, int resultCode, Intent data) {
		super.onActivityResult(requestCode, resultCode, data);

		if(requestCode == REQUEST_CODE_SCREEN_CAPTURE) {
			if(resultCode == Activity.RESULT_OK) {
			  mResultCode = resultCode;
		    mResultData = data;
				onScreenCaptureAllowed(resultCode, data);
			} else {
			  Log.d("ScreenCaptureActivity", "User cancelled screen capture.");
			}
		}
		finish();
	}

	private void onScreenCaptureAllowed(int resultCode, Intent data) {
		Log.d("ScreenCaptureActivity", "User allowed screen capture.");
    // Kick off media projection with result code and data
	}

}