注意：android2.3版本及以上不支持下面的自动接听方法。
（会抛异常：java.lang.SecurityException: Neither user xxxxx nor current process has android.permission.MODIFY_PHONE_STATE.）
原因：android2.3版本及以上android.permission.MODIFY_PHONE_STATE权限限制已经改为系统权限。
普通应用程序已经无法调用，所以网上找到的那些如何使用android.permission.MODIFY_PHONE_STATE的文章均已失效，但仍有引用的办法就是让你的程序程序系统程序。一种就是预制到ROM中，另一种就是使用系统签名。第一种我已经试验通过，第二种还有待验证。
http://kongweile.iteye.com/blog/1428033
言归正传，先说下如何使用映射机制实现自动接听和挂断。
第一步：准备应用环境需要的系统包和aidl文件。
（1）在应用中创建包:android.telephony
将android系统框架下的framework elephonyjavaandroid elephony目录中的NeighboringCellInfo.aidl文件复制到上面创建的包（android.telephony ）中；
（2）在应用中创建包:com.android.internal.telephony
将android系统框架下的framework elephonyjavacomandroidinternal elephony目录中的ITelephony.aidl文件复制到上面创建的包（com.android.internal.telephony ）中；
第二步：创建一个获取ITelephony的方法
PhoneUtils.java
Java代码
package com.zhouzijing.android.demo;
import java.lang.reflect.Method;
import com.android.internal.telephony.ITelephony;
import android.telephony.TelephonyManager;
public class PhoneUtils {
public static ITelephony getITelephony(TelephonyManager telephony) throws Exception {
Method getITelephonyMethod = telephony.getClass().getDeclaredMethod("getITelephony");
getITelephonyMethod.setAccessible(true);//私有化函数也能使用
return (ITelephony)getITelephonyMethod.invoke(telephony);
}
}
第三步：创建电话广播拦截器
MyPhoneBroadcastReceiver.java
Java代码
package com.zhouzijing.android.demo;
import com.android.internal.telephony.ITelephony;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.telephony.TelephonyManager;
import android.util.Log;
public class MyPhoneBroadcastReceiver extends BroadcastReceiver {
private final static String TAG = MyPhone.TAG;
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
Log.i(TAG, "[Broadcast]"+action);
//呼入电话
if(action.equals(MyPhone.B_PHONE_STATE)){
Log.i(TAG, "[Broadcast]PHONE_STATE");
doReceivePhone(context,intent);
}
}
public void doReceivePhone(Context context, Intent intent) {
String phoneNumber = intent.getStringExtra(
TelephonyManager.EXTRA_INCOMING_NUMBER);
TelephonyManager telephony = (TelephonyManager)context.getSystemService(
Context.TELEPHONY_SERVICE);
int state = telephony.getCallState();
switch(state){
case TelephonyManager.CALL_STATE_RINGING:
Log.i(TAG, "[Broadcast]等待接电话="+phoneNumber);
try {
ITelephony iTelephony = PhoneUtils.getITelephony(telephony);
iTelephony.answerRingingCall();//自动接通电话
//iTelephony.endCall();//自动挂断电话
} catch (Exception e) {
Log.e(TAG, "[Broadcast]Exception="+e.getMessage(), e);
}
break;
case TelephonyManager.CALL_STATE_IDLE:
Log.i(TAG, "[Broadcast]电话挂断="+phoneNumber);
break;
case TelephonyManager.CALL_STATE_OFFHOOK:
Log.i(TAG, "[Broadcast]通话中="+phoneNumber);
break;
}
}
}
第四部：注册电话广播拦截器
MyPhone.java
Java代码
package com.zhouzijing.android.demo;
import android.app.Activity;
import android.content.IntentFilter;
import android.os.Bundle;
import android.telephony.TelephonyManager;
import android.util.Log;
import android.view.View;
public class MyPhone extends Activity {
public final static String TAG = "MyPhone";
public final static String B_PHONE_STATE = TelephonyManager.ACTION_PHONE_STATE_CHANGED;
private MyPhoneBroadcastReceiver mBroadcastReceiver;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.my_phone);
}
//按钮1-注册广播
public void registerThis(View v) {
Log.i(TAG, "registerThis");
mBroadcastReceiver = new MyPhoneBroadcastReceiver();
IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(B_PHONE_STATE);
intentFilter.setPriority(Integer.MAX_VALUE);
registerReceiver(mBroadcastReceiver, intentFilter);
}
//按钮2-撤销广播
public void unregisterThis(View v) {
Log.i(TAG, "unregisterThis");
unregisterReceiver(mBroadcastReceiver);
}
}
第5步：在AndroidManifest.xml配置权限
Xml代码
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.MODIFY_PHONE_STATE" />
<uses-permission android:name="android.permission.CALL_PHONE"/>
其中：
Java代码
iTelephony.answerRingingCall();//自动接通电话
必须有权限 android.permission.MODIFY_PHONE_STATE
Java代码
iTelephony.endCall();//自动挂断电话
必须有权限 android.permission.CALL_PHONE
因为Android2.3以上增加了对permission android.permission.MODIFY_PHONE_STATE 的限制，2.3之前的通过反射机制调用ITelephone的能力的做法已经不适用。
2.3上实现方式：
public synchronized void answerRingingCall() {
查询系统PhoneAPP应用（PhoneGlobals.java）实现了对耳机插入、多媒体按键等通知的接受和处理。其中未发现有特殊的地方，个人认为，如果系统接收到此广播应该可以进行接听或挂断操作。
private void answerRingingCallWithBroadcast(Context context,TelephonyManager telmanager){
AudioManager audioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
//判断是否插上了耳机
if (! audioManager.isWiredHeadsetOn()) {
//4.1以上系统限制了部分权限， 使用三星4.1版本测试提示警告：Permission Denial: not allowed to send broadcast android.intent.action.HEADSET_PLUG from pid=1324, uid=10017
//这里需要注意一点，发送广播时加了权限“android.permission.CALL_PRIVLEGED”，则接受该广播时也需要增加该权限。但是4.1以上版本貌似这个权限只能系统应用才可以得到。测试的时候，自定义的接收器无法接受到此广播，后来去掉了这个权限，设为NULL便可以监听到了。
if(android.os.Build.VERSION.SDK_INT >=15 ){
Intent meidaButtonIntent = new Intent(Intent.ACTION_MEDIA_BUTTON);
KeyEvent keyEvent = new KeyEvent(KeyEvent.ACTION_UP, KeyEvent.KEYCODE_HEADSETHOOK);
meidaButtonIntent.putExtra(Intent.EXTRA_KEY_EVENT,keyEvent);
context.sendOrderedBroadcast(meidaButtonIntent, null);
}else{
// 以下适用于Android2.3及2.3以上的版本上 ，但测试发现4.1系统上不管用。
Intent localIntent1 = new Intent(Intent.ACTION_HEADSET_PLUG);
localIntent1.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
localIntent1.putExtra("state", 1);
localIntent1.putExtra("microphone", 1);
localIntent1.putExtra("name", "Headset");
context.sendOrderedBroadcast(localIntent1, "android.permission.CALL_PRIVILEGED");
Intent localIntent2 = new Intent(Intent.ACTION_MEDIA_BUTTON);
KeyEvent localKeyEvent1 = new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_HEADSETHOOK);
localIntent2.putExtra(Intent.EXTRA_KEY_EVENT, localKeyEvent1);
context. sendOrderedBroadcast(localIntent2, "android.permission.CALL_PRIVILEGED");
Intent localIntent3 = new Intent(Intent.ACTION_MEDIA_BUTTON);
KeyEvent localKeyEvent2 = new KeyEvent(KeyEvent.ACTION_UP, KeyEvent.KEYCODE_HEADSETHOOK);
localIntent3.putExtra(Intent.EXTRA_KEY_EVENT, localKeyEvent2);
context.sendOrderedBroadcast(localIntent3, "android.permission.CALL_PRIVILEGED");
Intent localIntent4 = new Intent(Intent.ACTION_HEADSET_PLUG);
localIntent4.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
localIntent4.putExtra("state", 0);
localIntent4.putExtra("microphone", 1);
localIntent4.putExtra("name", "Headset");
context.sendOrderedBroadcast(localIntent4, "android.permission.CALL_PRIVILEGED");
}
} else {
Intent meidaButtonIntent = new Intent(Intent.ACTION_MEDIA_BUTTON);
KeyEvent keyEvent = new KeyEvent(KeyEvent.ACTION_UP, KeyEvent.KEYCODE_HEADSETHOOK);
meidaButtonIntent.putExtra(Intent.EXTRA_KEY_EVENT,keyEvent);
context.sendOrderedBroadcast(meidaButtonIntent, null);
}
}