为了更好地理解这个Demo,我先向大家介绍一下需求与功能。
需求:
每天都会有很多无聊的电话,比如推销商品等,占用我们大量时间不说,有时候还会打乱我们的思路,扰乱我们的正常生活。所以实现一个对某些号码(比如陌生号码,指定号码/黑名单等)进行拦截以避免受到骚扰,是很有现实用途的。
为了避免程序过分复杂,造成不易学习的麻烦我在这里只实现“如果来电号码没在联系人中,则进行挂断,并存入xml文件(SharedPreferences)中,并在首页显示”,以期达到抛砖引玉的效果。
其实在android在1.1版本后就已经把Phone类的相关API给隐藏起来了,想要用代码实现挂断电话的功能,就必须通过AIDL才行,然后利用反射来使用其方法。
第一步:在程序中新建一个包,包名必须为:com.android.internal.telephony,因为要使用aidl。
第二步:在这个包里面新建一个名为ITelephony.aidl的文件,然后在文件里面写入代码:
[java] view plaincopyprint?package com.android.internal.telephony;
interface ITelephony{
boolean endCall();
void answerRingingCall();
}
package com.android.internal.telephony;
interface ITelephony{
boolean endCall();
void answerRingingCall();
}
然后是要监听电话状态,当来电时,检测来电号码是否符合拦截标准(这个拦截标准是我们自己定的,你可以拦截指定号码如实现一个黑名单的功能,我们在这里拦截所有不在联系人里的号码,并把此号码存入文件,以方便在首页显示),代码如下:
[java] view plaincopyprint?import java.lang.reflect.Method;
import java.util.ArrayList;
import com.android.internal.telephony.ITelephony;
import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.database.Cursor;
import android.provider.ContactsContract;
import android.telephony.TelephonyManager;
import android.util.Log;
public class PhoneStatReceiver extends BroadcastReceiver{
String TAG = "tag";
TelephonyManager telMgr;
@Override
public void onReceive(Context context, Intent intent) {
telMgr = (TelephonyManager) context.getSystemService(Service.TELEPHONY_SERVICE);
switch (telMgr.getCallState()) {
case TelephonyManager.CALL_STATE_RINGING:
String number = intent.getStringExtra(TelephonyManager.EXTRA_INCOMING_NUMBER);
Log.v(TAG,"number:"+number);
if (!getPhoneNum(context).contains(number)) {
SharedPreferences phonenumSP = context.getSharedPreferences("in_phone_num", Context.MODE_PRIVATE);
Editor editor = phonenumSP.edit();
editor.putString(number,number);
editor.commit();
endCall();
}
break;
case TelephonyManager.CALL_STATE_OFFHOOK:
break;
case TelephonyManager.CALL_STATE_IDLE:
break;
}
}
/**
* 挂断电话
*/
private void endCall()
{
Class c = TelephonyManager.class;
try
{
Method getITelephonyMethod = c.getDeclaredMethod("getITelephony", (Class[]) null);
getITelephonyMethod.setAccessible(true);
ITelephony iTelephony = null;
Log.e(TAG, "End call.");
iTelephony = (ITelephony) getITelephonyMethod.invoke(telMgr, (Object[]) null);
iTelephony.endCall();
}
catch (Exception e)
{
Log.e(TAG, "Fail to answer ring call.", e);
}
}
private ArrayList getPhoneNum(Context context) {
ArrayList numList = new ArrayList();
//得到ContentResolver对象
ContentResolver cr = context.getContentResolver();
//取得电话本中开始一项的光标
Cursor cursor = cr.query(ContactsContract.Contacts.CONTENT_URI, null, null, null, null);
while (cursor.moveToNext())
{
// 取得联系人ID
String contactId = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts._ID));
Cursor phone = cr.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null,
ContactsContract.CommonDataKinds.Phone.CONTACT_ID + " = " + contactId, null, null);
// 取得电话号码(可能存在多个号码)
while (phone.moveToNext())
{
String strPhoneNumber = phone.getString(phone.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
numList.add(strPhoneNumber);
Log.v("tag","strPhoneNumber:"+strPhoneNumber);
}
phone.close();
}
cursor.close();
return numList;
}
}
import java.lang.reflect.Method;
import java.util.ArrayList;
import com.android.internal.telephony.ITelephony;
import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.database.Cursor;
import android.provider.ContactsContract;
import android.telephony.TelephonyManager;
import android.util.Log;
public class PhoneStatReceiver extends BroadcastReceiver{
String TAG = "tag";
TelephonyManager telMgr;
@Override
public void onReceive(Context context, Intent intent) {
telMgr = (TelephonyManager) context.getSystemService(Service.TELEPHONY_SERVICE);
switch (telMgr.getCallState()) {
case TelephonyManager.CALL_STATE_RINGING:
String number = intent.getStringExtra(TelephonyManager.EXTRA_INCOMING_NUMBER);
Log.v(TAG,"number:"+number);
if (!getPhoneNum(context).contains(number)) {
SharedPreferences phonenumSP = context.getSharedPreferences("in_phone_num", Context.MODE_PRIVATE);
Editor editor = phonenumSP.edit();
editor.putString(number,number);
editor.commit();
endCall();
}
break;
case TelephonyManager.CALL_STATE_OFFHOOK:
break;
case TelephonyManager.CALL_STATE_IDLE:
break;
}
}
/**
* 挂断电话
*/
private void endCall()
{
Class c = TelephonyManager.class;
try
{
Method getITelephonyMethod = c.getDeclaredMethod("getITelephony", (Class[]) null);
getITelephonyMethod.setAccessible(true);
ITelephony iTelephony = null;
Log.e(TAG, "End call.");
iTelephony = (ITelephony) getITelephonyMethod.invoke(telMgr, (Object[]) null);
iTelephony.endCall();
}
catch (Exception e)
{
Log.e(TAG, "Fail to answer ring call.", e);
}
}
private ArrayList getPhoneNum(Context context) {
ArrayList numList = new ArrayList();
//得到ContentResolver对象
ContentResolver cr = context.getContentResolver();
//取得电话本中开始一项的光标
Cursor cursor = cr.query(ContactsContract.Contacts.CONTENT_URI, null, null, null, null);
while (cursor.moveToNext())
{
// 取得联系人ID
String contactId = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts._ID));
Cursor phone = cr.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null,
ContactsContract.CommonDataKinds.Phone.CONTACT_ID + " = " + contactId, null, null);
// 取得电话号码(可能存在多个号码)
while (phone.moveToNext())
{
String strPhoneNumber = phone.getString(phone.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
numList.add(strPhoneNumber);
Log.v("tag","strPhoneNumber:"+strPhoneNumber);
}
phone.close();
}
cursor.close();
return numList;
}
}这里我们要注意以下几点:
1.PhoneStatReceiver一定要在清单文件(AndroidManifest.xml)中注册。
2.一定要添加权限
AndroidManifest文件如下:
[html] view plaincopyprint?
package="com.xxxx.xxxx"
android:versionCode="1"
android:versionName="1.0" >
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
android:name=".MainActivity"
android:label="@string/app_name" >
package="com.xxxx.xxxx"
android:versionCode="1"
android:versionName="1.0" >
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
android:name=".MainActivity"
android:label="@string/app_name" >
其实最到这里,整个拦截功能就已经实现了,但是呢,我们的首页也不能让它光秃秃的显示个Hello World!吧。所以,在MainActivity中,再给大家加点料,就是在listView中显示所有已经被拦截的电话号码,代码如下:
[java] view plaincopyprint?import java.util.Map;
import android.app.ListActivity;
import android.content.Context;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.util.Log;
import android.widget.ArrayAdapter;
public class MainActivity extends ListActivity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
SharedPreferences phonenumSP = getSharedPreferences("in_phone_num", Context.MODE_PRIVATE);
Map map = phonenumSP.getAll();
Object[] array = map.keySet().toArray();
Log.v("tag",map.toString()+map.size());
ArrayAdapter adapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1,array);
setListAdapter(adapter);
}
}
import java.util.Map;
import android.app.ListActivity;
import android.content.Context;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.util.Log;
import android.widget.ArrayAdapter;
public class MainActivity extends ListActivity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
SharedPreferences phonenumSP = getSharedPreferences("in_phone_num", Context.MODE_PRIVATE);
Map map = phonenumSP.getAll();
Object[] array = map.keySet().toArray();
Log.v("tag",map.toString()+map.size());
ArrayAdapter adapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1,array);
setListAdapter(adapter);
}
}
好了,整个项目就完成了,我们可以拦截骚扰电话了,这只是一个小例子,你可以添加一些控制功能以更加人性化,比如开启和关闭拦截,可选的拦截时间段,给ListView添加点击事件使用户可以把拦截到的电话添加到通讯录等功能。