Android 广播接收者练习-发送有序广播

任务内容：



一，发送有序广播对应的布局页面：
<?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:id="@+id/activity_exe"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    android:background="@drawable/stitch_one"

    tools:context="com.example.administrator.hello.Exe">

    <Button

        android:text="发送有序广播"

        android:textSize="35dp"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_centerHorizontal="true"

        android:layout_marginTop="100dp"

        android:id="@+id/button" />

</RelativeLayout>

二、发送广播，当点击button按钮时，触发点击事件，会发送一条广播。
public class Exe extends AppCompatActivity {

    private Button button;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_exe);

       button = (Button) findViewById(R.id.button);

        button.setOnClickListener(new send());

    }

    private class send implements View.OnClickListener {

        @Override

        public void onClick(View v) {

            Intent intent = new Intent("Intercept_Stitch");

            sendOrderedBroadcast(intent,null);

        }

    }

}
三，接受广播，即添加广播接受者。
1.第一个接受者。

public class MyBroadReceiverOne extends BroadcastReceiver {

    public MyBroadReceiverOne() {

    }

    @Override

    public void onReceive(Context context, Intent intent) {

        // TODO: This method is called when the BroadcastReceiver is receiving

        // an Intent broadcast.

        Log.d("MyBroadReceiverOne","自定义的广播接受者01，接受到了自定义的广播事件");

    }

}
2.第二个接受者。
public class MyBroadReceiverTwo extends BroadcastReceiver {

    public MyBroadReceiverTwo() {

    }

    @Override

    public void onReceive(Context context, Intent intent) {

        // TODO: This method is called when the BroadcastReceiver is receiving

        // an Intent broadcast.

        Log.d("MyBroadReceiverTwo","自定义的广播接受者02，接受到了自定义的广播事件");

    }

}

3.第三个接受者
public class MyBroadReceiverThree extends BroadcastReceiver {

    public MyBroadReceiverThree() {

    }

    @Override

    public void onReceive(Context context, Intent intent) {

        // TODO: This method is called when the BroadcastReceiver is receiving

        // an Intent broadcast.

        Log.d("MyBroadReceiverThree","自定义的广播接受者03，接受到了自定义的广播事件");

    }

}

四,三个广播接受者创建后，需要在清单文件中注册并设置他们的优先级。(android:priority属性指定了广播事件的优先级，优先级由高到底依次为：接受者01,接受者03,接受者02，并且要为这三个接受者定义监听的广播事件action为"Intercept_Stitch")
      <receiver

            android:name=".MyBroadReceiverOne"

            android:enabled="true"

            android:exported="true">

        <intent-filter android:priority="800">

            <action android:name="Intercept_Stitch"/>

        </intent-filter>

        </receiver>

        <receiver

            android:name=".MyBroadReceiverTwo"

            android:enabled="true"

            android:exported="true">

        <intent-filter android:priority="200">

            <action android:name="Intercept_Stitch"/>

        </intent-filter>

    </receiver>

        <receiver

            android:name=".MyBroadReceiverThree"

            android:enabled="true"

            android:exported="true">

            <intent-filter android:priority="600">

                <action android:name="Intercept_Stitch"/>

            </intent-filter>

        </receiver>
 

所以当点击发送按钮时，按照优先级，他们的接受并弹出提示的顺序为01，03，02。