Android 监听来电和去电状态

要实现监听到打电话和接电话的状态，需要用到广播接受者BroadcastReceiver，其实现代码请参考如下;

一、定义一个类，继承BroadcastReceiver，重写onReceive()方法。

package com.example.phonereceiver;

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

public class PhoneReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent.getAction().equals(Intent.ACTION_NEW_OUTGOING_CALL)) {//去电
            System.out.println("去电");
        } else {//来电(存在以下三种情况)
            TelephonyManager tm = (TelephonyManager) context.getSystemService(Service.TELEPHONY_SERVICE);
            switch (tm.getCallState()) {
            case TelephonyManager.CALL_STATE_IDLE:
                System.out.println("挂断");
                break;
            case TelephonyManager.CALL_STATE_OFFHOOK:
                System.out.println("接听");
                break;
            case TelephonyManager.CALL_STATE_RINGING:
                System.out.println("响铃");
                break;
            }
        }
    }
}

二、在清单文件中注册该广播，并加上相应的权限。

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.phonereceiver"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="15" />

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

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <receiver android:name=".PhoneReceiver" >
            <intent-filter>
                <action android:name="android.intent.action.PHONE_STATE" />
                <action android:name="android.intent.action.NEW_OUTGOING_CALL" />
            </intent-filter>
        </receiver>
    </application>

</manifest>