Android初级教程IP拨号器初识广播接受者

需求：输入ip号码并且保存在本地，监听打电话广播，如果电话号码以0开头，则加上ip区号拨打。

首先定义一个页面布局：

<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="match_parent"
android:layout_height="wrap_content"
android:hint="请输入ip前缀号码" />

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="click"
android:text="保存" />

</LinearLayout>

保存用户输入的号码：

package com.example.ipdial;

import android.os.Bundle;
import android.app.Activity;
import android.content.SharedPreferences;
import android.view.Menu;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity {

private EditText et_number;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
et_number = (EditText) findViewById(R.id.et_ipnumber);
}

public void click(View v) {

String ipnumber = et_number.getText().toString().trim();
// 完成保存
SharedPreferences sp = getSharedPreferences("config", MODE_PRIVATE);

sp.edit().putString("ipNumber", ipnumber).commit();

Toast.makeText(this, "保存成功", 1).show();
}
}

定义广播接受者接收系统打电话广播。并且如果号码0开头，前加ip号码

package com.example.ipdial;

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

public class OutGoingCallReceiver extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {

SharedPreferences sp = context.getSharedPreferences("config", 0);
String ipNumber = sp.getString("ipNumber", "");

String resultData = getResultData();

if (resultData.startsWith("0")) {
setResultData(ipNumber + resultData);
}

}

}

广播接受者清单文件配置：

<receiver android:name="com.example.ipdial.OutGoingCallReceiver">
<intent-filter >
<action android:name="android.intent.action.NEW_OUTGOING_CALL"/>
</intent-filter>
</receiver>

修改打电话的号码需要权限：

<uses-permission android:name="android.permission.PROCESS_OUTGOING_CALLS"/>

成功。