[移动开发]4.1广播与服务的接收

?1) activity_main:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

   <Button
       android:id="@+id/send"
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:text="广播与服务"
       android:textSize="20sp"
       />

</LinearLayout>

?2) MainActivity:

package com.example.z5;

import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        findViewById(R.id.send).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent=new Intent();  //fasongguangbo
                intent.setAction("send1");
                intent.putExtra("msg","我是自定义广播");
              //  sendBroadcast(intent);
                sendOrderedBroadcast(intent,null);
                Toast.makeText(MainActivity.this,"成功",Toast.LENGTH_LONG).show();


            }
        });
    }
}

3)在AndroidMainfest中加入(顺便设优先级):

<receiver
        android:name=".MyReceiver03"
        android:enabled="true"
        android:exported="true">
    <intent-filter android:priority="200">
        <action android:name="send1" />
    </intent-filter>
</receiver>
    <receiver
        android:name=".MyReceiver02"
        android:enabled="true"
        android:exported="true" >
    <intent-filter android:priority="100">
        <action android:name="send1" />
    </intent-filter>
</receiver>
    <receiver
        android:name=".MyReceiver01"
        android:enabled="true"
        android:exported="true">
        <intent-filter android:priority="300">
            <action android:name="send1" />
        </intent-filter>
    </receiver>

?4)接收

|)? MyReceive01:

package com.example.z5;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;

public class MyReceiver01 extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
       String data=intent.getStringExtra("msg");
        Toast.makeText(context, "1接收"+data, Toast.LENGTH_SHORT).show();
       // abortBroadcast();
    }
}

||） MyReceiver03:

package com.example.z5;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;

public class MyReceiver03 extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        String data=intent.getStringExtra("msg");
        Toast.makeText(context, "3接收"+data, Toast.LENGTH_SHORT).show();
    }
}

|||）MyReceiver02:

package com.example.z5;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;

public class MyReceiver02 extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        String data=intent.getStringExtra("msg");
        Toast.makeText(context, "2接收"+data, Toast.LENGTH_SHORT).show();
    }
}

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