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>