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This article mainly introduces how to use android development to achieve hello world project, the article introduces in great detail, has a certain reference value, interested friends must read it!

Recently began to learn android development, this is my first project-hello world!

Public class MainActivity extends Activity {@ Override protected void onCreate (Bundle savedInstanceState) {super.onCreate (savedInstanceState); / / set the layout of activity-- > 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;}}

The main activity class for android, and the activity class is the class that android uses to display the user interface.

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 1111. 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 1400. 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;}}

This is R.java, this class is automatically generated by eclipse and does not need to be written manually by developers. It is used to register id for components and resources.

Find the reference to the corresponding resource in activity

This is the layout file of android, which controls the user UI

This is the manifest file of the android application, which is equivalent to the registry under windows

The above is all the contents of the article "how to use android to develop and implement hello world projects". Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

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