android之Hello World!

 

 HelloActivity.java

package com.archie.android;import android.app.Activity;import android.os.Bundle;public class HelloActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); }}

 

Activity类文件

 

R.java

 

/* AUTO-GENERATED FILE. DO NOT MODIFY. * * This class was automatically generated by the * aapt tool from the resource data it found. It * should not be modified by hand. */package com.archie.android;public final class R { public static final class attr { } public static final class drawable { public static final int icon=0x7f020000; } public static final class layout { public static final int main=0x7f030000; } public static final class string { public static final int app_name=0x7f040001; public static final int hello=0x7f040000; }}

 

自动生成，对res目录下的资源文件的描述，不要试着去更改

 

string.xml

 

<?xml version="1.0" encoding="utf-8"?><resources> <string name="hello">Hello World, HelloActivity!</string> <string name="app_name">helloworld</string></resources>

 

工程中所有的字符串描述文件，对于多个Activity可对其指定一个name，后跟Activity类名，以便在AndroidManifest.xml

 

对多个Activity进行标识，如：

<activity android:name=".ResultActivity" android:label="@string/result"/>

 

AndroidManifest.xml

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

 

整个工程的配置文件