開機廣播，當開機的時候播放音樂

public class MyReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        Toast.makeText(context,"您的手機已經開啓",Toast.LENGTH_LONG).show();
       //手機開啓跳轉到主頁面
        Intent intent1 = new Intent(context, MainActivity.class);
        intent1.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(intent1);
    }
}
//主頁面

public class MainActivity extends AppCompatActivity {
   //全集變量
    private Button stop;
    private MediaPlayer mediaPlayer;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //找到控件
        stop = (Button) findViewById(R.id.stop);
        mediaPlayer = MediaPlayer.create(this, R.raw.womendemingtian);
        //音樂播放
        mediaPlayer.start();
        //點擊停止播放音樂停止
        stop.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mediaPlayer.stop();
            }
        });
    }
}
//主頁面佈局

<Button
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="停止播放"
    android:id="@+id/stop"/>
//加權限

<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"></uses-permission>
//在清單列表註冊

<receiver android:name=".MyReceiver">
    <intent-filter>
        <action android:name="android.intent.action.BOOT_COMPLETED"/>
    </intent-filter>
</receiver>