1 public class MainActivity extends AppCompatActivity { 2  3  @Override 4 protected void onCreate(Bundle savedInstanceState) { 5  super.onCreate(savedInstanceState); 6  setContentView(R.layout.activity_main); 7  8 Button btn1 = findViewById(R.id.btn1); 9 Button btn2 = findViewById(R.id.btn2);10 11 btn1.setOnClickListener(new View.OnClickListener() {12  @Override13 public void onClick(View v) {14 Intent intent = new Intent();15 intent.setAction("hemeiwolong");16 intent.setPackage("com.mingrisoft.broadcast");　　//如果没有这句，将无法开启广播接收类接收广播，但程序不会崩溃，参数为此activity所在包路径17  sendBroadcast(intent);18  }19  });20  }21 }