Android中电话拦截器案例

实验要求：实现拦截保存到手机中的号码

1.在main-activity布局文件中代码如下：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:background="@drawable/sdz"
tools:context="cn.edu.bzu.interceptcall.MainActivity">
<EditText
android:id="@+id/et_ipnumber"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="请输入拦截号码"/>

<Button
android:text="保存拦截号码"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="82dp"
android:onClick="click"
android:id="@+id/button" />
</RelativeLayout>


2.在MainActivity中编写点击保存拦截号码按钮时的事件处理，代码如下：
package cn.edu.bzu.interceptcall;

import android.content.Intent;
import android.content.SharedPreferences;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
private EditText et_ipnumber;
private SharedPreferences sp;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
et_ipnumber= (EditText) findViewById(R.id.et_ipnumber);
//创建SharedPreferences对象
sp=getSharedPreferences("config",MODE_PRIVATE);
}
public void click(View view){
//获取用户输入的拦截号码
String number=et_ipnumber.getText().toString().trim();
//创建Editor对象，保存用户输入的拦截号码
SharedPreferences.Editor editor=sp.edit();
editor.putString("number",number);
editor.commit();
Toast.makeText(this,"保存成功",Toast.LENGTH_SHORT).show();
}
}


3.创建广播接收者OutcallReceiver，代码如下：
package cn.edu.bzu.interceptcall;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;

public class OutcallReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
//获取拨打的电话号码
String outcallnumber=getResultData();
//创建SharedPreferences对象，获取拦截号码
SharedPreferences sp=context.getSharedPreferences("config",Context.MODE_PRIVATE);
String number =sp.getString("number","");
//判断是否是拦截号码
if (outcallnumber.equals(number)){
//清除电话
setResultData(null);

}
}
}


4.注册广播接收者，在配置文件AndroidManifest中代码如下：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="cn.edu.bzu.interceptcall">

<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver
android:name=".OutcallReceiver"
android:enabled="true"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.NEW_OUTGOING_CALL"/>
</intent-filter>
</receiver>
</application>
<uses-permission android:name="android.permission.PROCESS_OUTGOING_CALLS"></uses-permission>

</manifest>5.运行效果图：