Android的本地广播

本地广播和全局广播(按照传播范围)
本地广播(app内部传播)数据,其它app收不到,保证了数据的安全性
全局广播,可以在整个手机所有App之间传播通信,会有安全性问题。普通广播默认就是全局广播。
例如监听开机充电打电话发短信修改时间这些

1.本地广播只能通过动态注册
2.本地广播需要用LoaalBroadcasrManager
代码示例:
xml文件:

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".broadcast.local.LocalBroadCastActivity">

    <Button
        android:id="@+id/btn_local"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:onClick="sendLocalBroadcast"
        android:text="本地广播">

    </Button>
</androidx.constraintlayout.widget.ConstraintLayout>

java代码:
本地广播类:MyLocalBroadcastReceiver

public class MyLocalBroadcastReceiver extends BroadcastReceiver {
    private static final String TAG = "MyLocalBroadcastReceiver";

    @Override
    public void onReceive(Context context, Intent intent) {

        Log.d(TAG, "onReceive: 收到了本地广播");
    }
}

Activity类:LocalBroadCastActivity

public class LocalBroadCastActivity extends AppCompatActivity {

    private MyLocalBroadcastReceiver myLocalBroadcastReceiver = new MyLocalBroadcastReceiver();
    LocalBroadcastManager mLocalBroadcastManager;

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

        /**
         * 本地广播只能动态注册
         */
        //实例化
        mLocalBroadcastManager = LocalBroadcastManager.getInstance(this);
        //注册广播接收器
        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction("local_broad_cast");
        mLocalBroadcastManager.registerReceiver(myLocalBroadcastReceiver, intentFilter);
    }

    //发送本地广播
    public void sendLocalBroadcast(View view) {
        Intent intent = new Intent();
        intent.setAction("local_broad_cast");
        mLocalBroadcastManager.sendBroadcast(intent);
    }

    //解除注册
    @Override
    protected void onDestroy() {
        super.onDestroy();
        mLocalBroadcastManager.unregisterReceiver(myLocalBroadcastReceiver);
    }
}

猜你喜欢