Android第一个功能：手机拨号器

核心代码四部分：

1、Layout

2、String值

3、MainActivity

4、给项目添加使用授权

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <TextView        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="@string/mobile" />        <EditText         android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:id="@+id/mobile"        />    <Button         android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="@string/button"        android:id="@+id/button"        />    </LinearLayout>

<?xml version="1.0" encoding="utf-8"?><resources>    <string name="hello">Hello World, FirstPhoneActivity!</string>    <string name="app_name">电话拨号器</string>    <string name="mobile">请输入手机号</string>    <string name="button">拨号</string></resources>

package com.dcj;import com.dcj.R;import android.app.Activity;import android.content.Intent;import android.net.Uri;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.EditText;public class MainActivity extends Activity {    private EditText mobileText;        @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        mobileText = (EditText)findViewById(R.id.mobile);        Button button = (Button)this.findViewById(R.id.button);        button.setOnClickListener(new ButtonClickListener());    }        private final class ButtonClickListener implements View.OnClickListener {public void onClick(View v) {String number = mobileText.getText().toString();//Intent intent = new Intent(Intent.ACTION_CALL,Uri.parse("tel:"+number) ); 等同于以下三行代码Intent intent = new Intent();intent.setAction("android.intent.action.CALL");intent.setData(Uri.parse("tel:"+number));startActivity(intent);//方法内部会自动为Intent添加类别：android.intent.category.DEFAULT}        }}

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.dcj"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk android:minSdkVersion="8" />    <application        android:icon="@drawable/ic_launcher"        android:label="@string/app_name" >        <activity            android:name=".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>    </application><uses-permission android:name="android.permission.CALL_PHONE"/></manifest>

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