Demo Activity for https://github.com/mtsahakis/MediaProjectionDemo/issues/7 that calls https://gist.github.com/mtsahakis/a4dca46b80cb8ac2cd100a7a52f65b1d

ScreenCaptureActivity.java

package com.mtsahakis.mediaprojectiondemo;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.media.projection.MediaProjectionManager;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;


public class ScreenCaptureActivity extends Activity {

    private static final int REQUEST_CODE = 100;

    /****************************************** Activity Lifecycle methods ************************/
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // start projection
        Button startButton = (Button)findViewById(R.id.startButton);
        startButton.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                startProjection();
            }
        });

        // stop projection
        Button stopButton = (Button)findViewById(R.id.stopButton);
        stopButton.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                stopProjection();
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == REQUEST_CODE) {
            if (resultCode == Activity.RESULT_OK) {
                startService(ScreenCaptureService.getStartIntent(this, resultCode, data));
            }
        }
    }

    /****************************************** UI Widget Callbacks *******************************/
    private void startProjection() {
        MediaProjectionManager mProjectionManager =
                (MediaProjectionManager) getSystemService(Context.MEDIA_PROJECTION_SERVICE);
        startActivityForResult(mProjectionManager.createScreenCaptureIntent(), REQUEST_CODE);
    }

    private void stopProjection() {
        startService(ScreenCaptureService.getStopIntent(this));
    }

}