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public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        final Button sendBroadcast = findViewById(R.id.sendBroadcast);

        sendBroadcast.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent();
                intent.setAction("com.example.it.lec10_v2broadcastsender.App1Message");
                intent.putExtra("msg","NEeeeeeeeeeeeeeeeeeew Messsssssssssage");
                sendBroadcast(intent);
            }
        });
    }
}