Android实战开发之广播BroadcastReciver的基本使用

3 Replies

0、广播分为静态广播、动态广播、有序广播和无序广播，先从简单的说起；
1、最简单的是静态注册，分为2个步骤：
1.1、创建一个BoradcastReciver的实体子类，实现onReceive()方法；
1.2、在Manifest文件中注册该类及广播事件即可

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<receiver android:name=".Broadcast">
    <intent-filter>
        <action android:name="android.intent.action.AIRPLANE_MODE"/>
    </intent-filter>
</receiver>
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package com.yusian.broadcast;
 
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;
 
/**
 * Created by Sian on 2017/3/25.
 */
 
public class Broadcast extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        Toast.makeText(context, "接收到了一个广播", Toast.LENGTH_SHORT).show();
    }
}

3 thoughts on “Android实战开发之广播BroadcastReciver的基本使用”

  1. Sian Post author

    还有一类有序广播，有序广播与无序广播在发送广播时调用的方法不一样，有序广播调用的是sendOrderedBroadcast()方法，有序广播会在将接收者中一个一个往下传，类似击鼓传花的模式，每一个接收者对广播的修改都会直接影响后面的接收者

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    package com.yusian.broadcast;
 
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
 
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        Button sendBroadcast = (Button) findViewById(R.id.btn_sendBroadcase);
        sendBroadcast.setOnClickListener(this);
        Button orderBroadcast = (Button) findViewById(R.id.btn_send_order_broadcast);
        orderBroadcast.setOnClickListener(this);
    }
 
    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.btn_sendBroadcase:{
                Intent intent = new Intent();
                intent.setAction("com.yusian.broadcast.broadcast");
                sendBroadcast(intent);
            }break;
            case R.id.btn_send_order_broadcast:{
                Intent intent = new Intent();
                intent.setAction("com.yusian.broadcast.broadcast");
                sendOrderedBroadcast(intent,null,null,null,0,"初始值",null);
            }break;
            default:break;
        }
    }
}
 
class ABroadcastReciver extends BroadcastReceiver{
    @Override
    public void onReceive(Context context, Intent intent) {
        Log.d("SALog", "onReceive: AAA-->接收到：" + getResultData());
    }
}
class BBroadcastReciver extends BroadcastReceiver{
    @Override
    public void onReceive(Context context, Intent intent) {
        Log.d("SALog", "onReceive: BBB-->接收到：" + getResultData());
        abortBroadcast();
    }
}
class CBroadcastReciver extends BroadcastReceiver{
    @Override
    public void onReceive(Context context, Intent intent) {
        Log.d("SALog", "onReceive: CCC-->接收到：" + getResultData());
        setResultData("C修改过初始值");
    }
}

    运行结果：

    D/SALog: onReceive: CCC–>接收到：初始值
    D/SALog: onReceive: BBB–>接收到：C修改了初始值

    ↓
  2. Sian Post author

    1、什么是无序广播？无序广播指接收者相互之间独立互不影响；
    2、举个栗子，在manifast中注册3个广播接收者，并创建3个BroadcastReciver的实体类；
    3、发送广播

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            <receiver android:name=".ABroadcastReciver">
            <intent-filter>
                <action android:name="com.yusian.broadcast.broadcast"/>
            </intent-filter>
        </receiver>
        <receiver android:name=".BBroadcastReciver">
            <intent-filter>
                <action android:name="com.yusian.broadcast.broadcast"/>
            </intent-filter>
        </receiver>
        <receiver android:name=".CBroadcastReciver">
            <intent-filter>
                <action android:name="com.yusian.broadcast.broadcast"/>
            </intent-filter>
        </receiver>

    Activity

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    package com.yusian.broadcast;
 
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
 
public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        Button sendBroadcast = (Button) findViewById(R.id.btn_sendBroadcase);
        sendBroadcast.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                switch (v.getId()){
                    case R.id.btn_sendBroadcase:{
                        Intent intent = new Intent();
                        intent.setAction("com.yusian.broadcast.broadcast");
                        sendBroadcast(intent);
                    }break;
                    default:break;
                }
            }
        });
    }
}
 
class ABroadcastReciver extends BroadcastReceiver{
    @Override
    public void onReceive(Context context, Intent intent) {
        Log.d("SALog", "onReceive: AAA");
    }
}
class BBroadcastReciver extends BroadcastReceiver{
    @Override
    public void onReceive(Context context, Intent intent) {
        Log.d("SALog", "onReceive: BBB");
    }
}
class CBroadcastReciver extends BroadcastReceiver{
    @Override
    public void onReceive(Context context, Intent intent) {
        Log.d("SALog", "onReceive: CCC");
    }
}

    运行结果：

    03-25 14:40:38.983 12979-12979/com.yusian.broadcast D/SALog: onReceive: AAA
    03-25 14:40:38.993 12979-12979/com.yusian.broadcast D/SALog: onReceive: BBB
    03-25 14:40:39.003 12979-12979/com.yusian.broadcast D/SALog: onReceive: CCC

    ↓
  3. Sian Post author

    注意：静态广播只要App在运行即可响应，哪怕退到后台也一样；但动态广播则不行，必须前台运行时才能响应；
    动态广播可以通过创建一个内部类来实现：

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    package com.yusian.broadcast;
 
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
 
public class MainActivity extends AppCompatActivity {
    private AirPlayReciver airPlayReciver;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        airPlayReciver = new AirPlayReciver();
        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction("android.intent.action.AIRPLANE_MODE");
        registerReceiver(airPlayReciver, intentFilter);
    }
 
    class AirPlayReciver extends BroadcastReceiver{
 
        @Override
        public void onReceive(Context context, Intent intent) {
            Log.i("SALog", "onReciver:AirPlayReciver");
        }
    }
 
    @Override
    protected void onDestroy() {
        super.onDestroy();
        unregisterReceiver(airPlayReciver);
    }
}
    ↓

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