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：