Android-发送有序广播

最新推荐文章于 2025-07-26 18:04:14 发布

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#有序广播

本文详细介绍了如何在Android中实现有序广播，通过sendOrderedBroadcast()方法发送广播，并探讨了广播接收器的设计，包括MyBroadcastReceiverOne、MyBroadcastReceiverTwo和MyBroadcastReceiverThree的创建，以及设置优先级来控制接收顺序。最后，阐述了有序广播从发送到依次被三个接收器处理的工作流程。

1.功能描述：实现拦截一条有序广播。

2.技术要点：通过sendOrderedBroadcast()方法发送一条有序广播。

（1）用户交互界面的设计与实现

（2）界面交互代码的设计与实现

（3）创建3个广播接受者：

MyBroadcastReceiverOne.java

MyBroadcastReceiverTwo.java

MyBroadcastReceiverThree.java

3.实现步骤：（4）设置优先级广播接受者的优先级

4.有序广播的工作流程：

发送一条广播——>广播接受器1—|—>广播接收器2—|—>广播接收器3

实例：

1、编写用户交互界面

activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="@drawable/stitch_one"
    tools:context=".MainActivity">

    <Button
        android:text="发送有序广播"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
         android:onClick="send"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="80dp"
        android:paddingLeft="5dp"
        android:paddingRight="5dp"
        android:background="#FBFBFF"
         android:textSize="20sp"
         />
</RelativeLayout>

2、点击发送有序广播按钮时事件处理

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    public void send(View view){
        Intent intent=new Intent();
        //定义广播的事件类型public class MyBroadcastReceiverThree extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        Log.i("MyBroadcastReceiverThree"," Three接收到广播");
    }
}

intent.setAction("Intercept_Stitch"); //发送广播 sendOrderedBroadcast(intent,null); }}

3、创建广播接收者MyBroadcastReceiverOne

public class MyBroadcastReceiverOne extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        Log.i("MyBroadcastReceiverOne"," One接收到广播");
    }
}

创建广播接收者MyBroadcastReceiverTwo

public class MyBroadcastReceiverTwo extends BroadcastReceiver{
    @Override
    public void onReceive(Context context, Intent intent) {
        Log.i("MyBroadcastReceiverTwo"," Two接收到广播");
    }
}

创建广播接收者MyBroadcastReceiverThree

public class MyBroadcastReceiverThree extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        Log.i("MyBroadcastReceiverThree"," Three接收到广播");
    }
}