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。