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>