拦截来电（来电挂断）

通过监听系统通话状态的改变，来实现拦截来电，但这种拦截方式存在缺陷，会有来电界面显示（包括来电声音和来电界面），原因是时机过晚；并且只有系统apk才能挂断电话。

1.MainActivity.java

package com.tdc.endphone;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

}

2.PhoneStatReceiver.java

package com.tdc.endphone;

import java.lang.reflect.Method;

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

public class PhoneStatReceiver extends BroadcastReceiver {
TelephonyManager telMgr;
@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
telMgr = (TelephonyManager) context.getSystemService(Service.TELEPHONY_SERVICE);
switch (telMgr.getCallState()) {
case TelephonyManager.CALL_STATE_RINGING:
endCall();
break;
case TelephonyManager.CALL_STATE_OFFHOOK:
break;
case TelephonyManager.CALL_STATE_IDLE:
break;
}
}

private void endCall()
{
Class<TelephonyManager> c = TelephonyManager.class;
try
{
Method getITelephonyMethod = c.getDeclaredMethod("getITelephony", (Class[]) null);
getITelephonyMethod.setAccessible(true);
ITelephony iTelephony = null;
iTelephony = (ITelephony) getITelephonyMethod.invoke(telMgr, (Object[]) null);
iTelephony.endCall();
}
catch (Exception e)
{

}
}
}

3.AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.tdc.endphone"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.CALL_PHONE"/>
<!-- 读取手机状态的权限 -->
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<!-- 读contact的权限 -->
<uses-permission android:name="android.permission.READ_CONTACTS" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.tdc.endphone.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>

<!-- 注册监听手机状态 -->
<receiver android:name=".PhoneStatReceiver">
<intent-filter android:priority="1000" >
<action android:name="android.intent.action.PHONE_STATE" />
</intent-filter>
</receiver>
</application>

</manifest>