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：