BroadcastReceiver学习

一、使用系统广播。以监听电话状态为例

1、写一个类继承自BroadcastReceiver类

 package com.diysoul.android.blacklist.receivers;

 import android.app.Service;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.telephony.TelephonyManager;
 import android.util.Log;

 public class IncomingcallReceiver extends BroadcastReceiver {

     private static final String TAG = "IncomingcallReceiver";

     private boolean incomingFlag = false;
     private String incoming_number = null;

     @Override
     public void onReceive(Context context, Intent intent) {
         Log.v(TAG, "onReceive,Action:" + intent.getAction());

         // 如果是拨打电话
         if (intent.getAction().equals(Intent.ACTION_NEW_OUTGOING_CALL)) {
             incomingFlag = false;
             String phoneNumber = intent
                     .getStringExtra(Intent.EXTRA_PHONE_NUMBER);
             Log.i(TAG, "call OUT:" + phoneNumber);
         } else {
             // 如果是来电
             TelephonyManager tm = (TelephonyManager) context
                     .getSystemService(Service.TELEPHONY_SERVICE);

             switch (tm.getCallState()) {
             case TelephonyManager.CALL_STATE_RINGING:
                 incomingFlag = true;// 标识当前是来电
                 incoming_number = intent.getStringExtra("incoming_number");
                 Log.i(TAG, "RINGING :" + incoming_number);
                 break;
             case TelephonyManager.CALL_STATE_OFFHOOK:
                 if (incomingFlag) {
                     Log.i(TAG, "incoming ACCEPT :" + incoming_number);
                 }
                 break;

             case TelephonyManager.CALL_STATE_IDLE:
                 if (incomingFlag) {
                     Log.i(TAG, "incoming IDLE");
                 }
                 break;
             }
         }
     }
 }

2、配置AndroidManifest.xml

 <receiver android:name="com.diysoul.android.blacklist.receivers.IncomingcallReceiver">
             <intent-filter>
                 <action android:name="android.intent.action.PHONE_STATE" />
             </intent-filter>
         </receiver>

3、配置系统权限

<uses-permission android:name="android.permission.READ_PHONE_STATE"/>

二、自定义广播事件

1.发送广播

             Intent intent = new Intent();
             //自定义一个广播动作。
             intent.setAction(action);
             //发送无序广播，所有接收都都可以收到，不可拦截或修改
             sendBroadcast(intent);
             //发送有序广播，可以被拦截或修改，也可以被终止
             sendOrderedBroadcast(intent, receiverPermission);
             sendOrderedBroadcast(intent, receiverPermission, resultReceiver, scheduler, initialCode, initialData, initialExtras);

2.接收广播放的类，修改或终止广播，只针对有序广播。对于无序广播，会报异常，将不会执行相应的功能。

             //修改广播数据
             setResultData(data);
             setResultExtras(extras);
             //终止继续发送广播，低优先级或同优先级但后部署的应用将不能收到
             //有一种例外是resultReceiver指定的对象仍可收到消息，但前面的应用若修改后，即使收到也是修改后的数据
             abortBroadcast();

3.接收广播放的类，配置AndroidManifest.xml

 //设置优先级priority的值 -1000 ~ 1000 数值级别相同，则先安装的应用先收到。同一个应用中，先声明的receiver先收到
             <receiver android:name="CLASSNAME" >
             <intent-filter android:priority="100" >
                 <action android:name="ACTION" />
             </intent-filter>