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. ^_^