這篇文章主要介紹如何使用android開發(fā)實現(xiàn)hello world項目,文中介紹的非常詳細,具有一定的參考價值,感興趣的小伙伴們一定要看完!
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最近開始在學android開發(fā),這是我的第一個項目 ——hello world!
public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //設置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類,activity類是android用來顯示用戶界面的類。
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; } }
這是R.java,這個類有eclipse自動生成,不需要開發(fā)者手動寫,是用來為組件,資源注冊id的,便于
在activity中找到相應資源的引用
<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:gravity="center_vertical|center_horizontal" android:orientation="vertical" tools:context=".MainActivity" > <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/hello_world" /> </LinearLayout>
這是android的布局文件,控制用戶UI
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.panda.helloworld" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="18" /> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name="com.panda.helloworld.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> </manifest>
這是android應用的清單文件,相當于windows下的注冊表
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