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这篇文章主要介绍如何使用android开发实现hello world项目,文中介绍的非常详细,具有一定的参考价值,感兴趣的小伙伴们一定要看完!
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最近开始在学android开发,这是我的第一个项目 ——hello world!
public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //设置activity的布局-->res/layout/activity_main.xml setContentView(R.layout.activity_main); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } }
android的主activity类,activity类是android用来显示用户界面的类。
public final class R { public static final class attr { } public static final class dimen { /** Default screen margins, per the Android Design guidelines. Customize dimensions originally defined in res/values/dimens.xml (such as screen margins) for sw720dp devices (e.g. 10" tablets) in landscape here. */ public static final int activity_horizontal_margin=0x7f040000; public static final int activity_vertical_margin=0x7f040001; } public static final class drawable { public static final int ic_launcher=0x7f020000; } public static final class id { public static final int action_settings=0x7f080000; } public static final class layout { public static final int activity_main=0x7f030000; } public static final class menu { public static final int main=0x7f070000; } public static final class string { public static final int action_settings=0x7f050001; public static final int app_name=0x7f050000; public static final int hello_world=0x7f050002; } public static final class style { /** Base application theme, dependent on API level. This theme is replaced by AppBaseTheme from res/values-vXX/styles.xml on newer devices. Theme customizations available in newer API levels can go in res/values-vXX/styles.xml, while customizations related to backward-compatibility can go here. Base application theme for API 11+. This theme completely replaces AppBaseTheme from res/values/styles.xml on API 11+ devices. API 11 theme customizations can go here. Base application theme for API 14+. This theme completely replaces AppBaseTheme from BOTH res/values/styles.xml and res/values-v11/styles.xml on API 14+ devices. API 14 theme customizations can go here. */ public static final int AppBaseTheme=0x7f060000; /** Application theme. All customizations that are NOT specific to a particular API-level can go here. */ public static final int AppTheme=0x7f060001; } }
这是R.java,这个类有eclipse自动生成,不需要开发者手动写,是用来为组件,资源注册id的,便于
在activity中找到相应资源的引用
这是android的布局文件,控制用户UI
这是android应用的清单文件,相当于windows下的注册表
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