Android - Listener for incoming phone

1. 首先创造一个空的 Activity 且删掉多余的代码, 完整的代码如下:

MainActivity.java

package com.example.test.callreceiver;import android.app.Activity;import android.os.Bundle;import android.view.Menu;import android.util.Log;public class MainActivity extends Activity {    private final String TAG="CallReceiver";    public MainActivity() {    }    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        //Log.i(TAG, "onCreate()");    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.menu_main, menu);        return true;    }}

2. 创建 class "Receiver.java" 能接受广播, 在 onReceive() 中加入收到信息后的操作.

先获取 TelephoneManager: 可以利用 context 的 getSystemService 方法获取 

(TelephonyManager)context.getSystemService(Context.TELEPHONY_SERVICE);

再创建一个 listener 用来监听及实现监听后的操作, 这个 listener extends to "PhoneStateListener"

在 onCallStateChanged() 方法中实现监听到之后的操作, 如打印电话号码及状态.

private class MyPhoneStateListener extends PhoneStateListener {        public void onCallStateChanged(int state, String incomingNumber) {            Log.i(TAG, state + " incoming number: " + incomingNumber);        }    }

<span style="white-space:pre"></span>    // create listener<span style="white-space:pre"></span>    MyPhoneStateListener PhoneListener = new MyPhoneStateListener();

listener 创建之后就可以利用它来监听  “PhoneStateListener.LISTEN_CALL_STATE” 事件.

将实例化后的 PhoneListener 及要监听的事件加入到 TelephoneManager 要监听的对象及事件中.

            // register listener for LISTEN_CALL_STATE            telmgr.listen(PhoneListener, PhoneStateListener.LISTEN_CALL_STATE);

Receiver.java 完整代码如下:

package com.example.test.callreceiver;/** * Created by elvis on 10/13/15. */import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.telephony.TelephonyManager;import android.util.Log;import android.telephony.PhoneStateListener;public class Receiver extends BroadcastReceiver {    private final String TAG="CallReceiver";    public Receiver() {    }    private class MyPhoneStateListener extends PhoneStateListener {        public void onCallStateChanged(int state, String incomingNumber) {            Log.i(TAG, state + " incoming number: " + incomingNumber);        }    }    public void onReceive(Context context, Intent intent) {        Log.i(TAG, "onReceive()");        //String num = this.getResultData();        //Log.i(TAG, num);        try {            // telephone manager            TelephonyManager telmgr = (TelephonyManager)context.getSystemService(Context.TELEPHONY_SERVICE);            // create listener            MyPhoneStateListener PhoneListener = new MyPhoneStateListener();            // register listener for LISTEN_CALL_STATE            telmgr.listen(PhoneListener, PhoneStateListener.LISTEN_CALL_STATE);        } catch (Exception e) {            Log.e(TAG, "Phone Receive Error " + e);        }    }}

3. 在 AndroidManifest.xml 中加入权限

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.test.callreceiver" >    <!-- 读取电话信息授权 -->    <uses-permission android:name="android.permission.READ_PHONE_STATE"/>    <application        android:allowBackup="true"        android:icon="@mipmap/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name=".MainActivity"            android:label="@string/app_name" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>        <!-- 配置广播拦截外拨通话 -->        <receiver android:name="com.example.test.callreceiver.Receiver">            <intent-filter android:priority="1000">                <action android:name="android.intent.action.PHONE_STATE"/>            </intent-filter>        </receiver>    </application></manifest>

4. 安装 APK 之后， emulator 未来电状态

利用 logcat 来显示调试信息

adb logcat CallReceiver:I *:S

模拟电话播入的方法

此时将会在 emulator 看到

而可以看到 logcat 显示的信息

至此我们已成功的拦截播入电话的信息. ^_^