Android(java)学习笔记175:BroadcastReceiver之 外拨电话的广播接收者

时间:2022-01-09 17:16:12

1. 外拨电话的广播接收者:

首先我们示例工程一览表如下:

Android(java)学习笔记175:BroadcastReceiver之 外拨电话的广播接收者

(2)首先我们还是买一个收音机,定义一个OutCallReceiver继承自BroadcastReceiver,onReceive()方法中定义了监听到广播,要执行的操作:

public class OutCallReceiver extends BroadcastReceiver {

          @Override
          public void onReceive(Context context, Intent intent) {
                  SharedPreferences sp = context.getSharedPreferences("config", 0);
                  // 修改用户拨打的电话号码, 在号码前面加上17951
                  String number = getResultData();
                  System.out.println("------有外拨电话出去了。" + number);
                  if (number.startsWith("0")) {
                        setResultData(sp.getString("ipnumber", "")+ number);
                  }
                  setResultData(null);
          }

 }

(3)装电池 和 调频道,在AndroidManifest.xml文件中配置:

<receiver android:name="com.itheima.ipdailer.OutCallReceiver">
              <intent-filter >
                       <action android:name="android.intent.action.NEW_OUTGOING_CALL"/>
              </intent-filter>
</receiver>

这里注意添加一个外接电话拨入权限:
<uses-permission android:name="android.permission.PROCESS_OUTGOING_CALLS"/>

2. 工程代码总览图:

(1)activity_main.xml:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity" > <EditText
android:id="@+id/et_ipnumber"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:hint="请输入要设置的ip号码前缀" /> <Button
android:onClick="save"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="保存"
/> </LinearLayout>

 

(2)MainActivity.java:

package com.itheima.ipdailer;

import android.app.Activity;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast; public class MainActivity extends Activity {
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);
sp = this.getSharedPreferences("config", 0);
et_ipnumber.setText(sp.getString("ipnumber", ""));
} public void save(View view){
String ipnumber = et_ipnumber.getText().toString().trim();
Editor editor = sp.edit();
editor.putString("ipnumber", ipnumber);
editor.commit();
Toast.makeText(this, "设置成功", 0).show();
} }

(3)OutCallReceiver.java:

package com.itheima.ipdailer;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
//买一个收音机
public class OutCallReceiver extends BroadcastReceiver { @Override
public void onReceive(Context context, Intent intent) {
SharedPreferences sp = context.getSharedPreferences("config", 0);
// 修改用户拨打的电话号码, 在号码前面加上17951
String number = getResultData();
System.out.println("------有外拨电话出去了。" + number);
if (number.startsWith("0")) {
setResultData(sp.getString("ipnumber", "")+ number);
}
setResultData(null);
} }

(4)AndroidManifest.xml:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.itheima.ipdailer"
android:versionCode="1"
android:versionName="1.0" > <uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" /> //添加一个外接电话拨入的权限
<uses-permission android:name="android.permission.PROCESS_OUTGOING_CALLS"/> <application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.itheima.ipdailer.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> //装电池,调频道
<receiver android:name="com.itheima.ipdailer.OutCallReceiver">
<intent-filter >
<action android:name="android.intent.action.NEW_OUTGOING_CALL"/>
</intent-filter>
</receiver>
    </application>

</manifest>