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一共分三步

• 1.定义一个BroadcastReceiver广播接收类
• 2.注册该广播
• 3.触发响应

1. 概念

• 广播事件处理属于系统级的事件处理（一般事件处理是属于View级的事件处理）

• 一个应用可以在发生特定事件时发送Broadcast, 系统中任何应用只要注册了对应Receiver就会接收到此Broadcast

• 一个应用如果对某个广播感兴趣, 就可以注册对应的Receiver来接收广播

• 广播事件机制是应用程序(进程间)之间通信的一种手段

2. 相关 API

//ContextsendBroadcast(Intent intent) : 发送一般广播sendOrderedBroadcast(Intent intent) : 发送有序广播registerReceiver(receiver, intentFilter) : 注册广播接收器unRegisterReceiver(receiver) : 解注册广播接收器//BroadcastReceiveronReceive(Context context, Intent intent) : 接收到广播的回调abortBroadcast() : 中断广播的继续传播boolean isOrderedBroadcast() : 判断是否是有序广播

3. 常见系统广播

收到短信广播 : android.provider.Telephony.SMS_RECEIVED开机完成广播 : Intent.ACTION_BOOT_COMPLETED应用被卸载广播 : Intent.ACTION_PACKAGE_REMOVED手机锁屏 : Intent.ACTION_SCREEN_OFF手机开屏 : Intent.ACTION_SCREEN_ON

4. 编写 BroadcastReceiver

public class MyBroadcastReceiver extends BroadcastReceiver{
        public void onReceive(Context context, Intent intent){        //处理广播    }}private BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver(){        @Override        public void onReceive(Context context, Intent intent) {            String action = intent.getAction();            if(action.equals(ACTION_NAME)){                Toast.makeText(Test.this, "处理action名字相对应的广播", 200);            }        }    };

5. 注册广播接收器类

5.1 方式一: 配置文件注册(静态注册)

5.2 方式二: 硬编码注册(动态注册)

public void registerBoradcastReceiver(){        IntentFilter myIntentFilter = new IntentFilter();        myIntentFilter.addAction(ACTION_NAME);        //注册广播              registerReceiver(mBroadcastReceiver, myIntentFilter);    }

5.3 区别静态注册与动态注册

5.4 有序广播和无序广播

发送一般广播

context.sendBroadCast(Intent intent)

发送有序广播

context.sendOrderedBroadcast(Intent intent)

区别

6. 触发响应

mBtnMsgEvent = new Button(this);        mBtnMsgEvent.setText("发送广播");        mBtnMsgEvent.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View v) {                Intent mIntent = new Intent(ACTION_NAME);                mIntent.putExtra("yaner", "发送广播，相当于在这里传送数据");                //发送广播                sendBroadcast(mIntent);            }        });

7. 完整源码

package my.yaner;import android.app.Activity;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.LinearLayout;import android.widget.Toast;public class Test extends Activity{
       private final String ACTION_NAME = "发送广播";    private Button mBtnMsgEvent = null;    protected void onCreate(Bundle savedInstanceState){        super.onCreate(savedInstanceState);        //注册广播        registerBoradcastReceiver();        LinearLayout mLinearLayout = new LinearLayout(this);        mBtnMsgEvent = new Button(this);        mBtnMsgEvent.setText("发送广播");        mLinearLayout.addView(mBtnMsgEvent);        setContentView(mLinearLayout);        mBtnMsgEvent.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View v) {                Intent mIntent = new Intent(ACTION_NAME);                mIntent.putExtra("yaner", "发送广播，相当于在这里传送数据");                //发送广播                sendBroadcast(mIntent);            }        });    }    private BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver(){        @Override        public void onReceive(Context context, Intent intent) {            String action = intent.getAction();            if(action.equals(ACTION_NAME)){                Toast.makeText(Test.this, "处理action名字相对应的广播", 200);            }        }    };    public void registerBoradcastReceiver(){        IntentFilter myIntentFilter = new IntentFilter();        myIntentFilter.addAction(ACTION_NAME);        //注册广播              registerReceiver(mBroadcastReceiver, myIntentFilter);    }}