Android学习札记(5)——Android——HelloWorldDemo

工程目录结构：

??? HelloWorldActivity.java程序清单

package com.oristand;import android.app.Activity;import android.os.Bundle;public class HelloWorldActivity extends Activity {    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);//到layout目录下会对应一个main.xml配置文件，改文件决定了你要使用的那些组件，以及组件的属性，比如TextView、EditText、Button等    }}

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?? ?main.xml程序清单

<?xml version="1.0" encoding="utf-8"?><TextView xmlns:android="http://schemas.android.com/apk/res/android"	android:id="@+id/hello_world" android:layout_width="fill_parent"	android:layout_height="fill_parent" android:gravity="center_vertical|center_horizontal"	android:text="@string/hello_world" />

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???R.java程序清单 —— res目录下的任何一个配置修改后，该文件会自动修改，这就是mvc模式的好处，一旦model修改，view也相应的改变，这就是mvc的优势

package com.oristand;public final class R {    public static final class attr {    }    public static final class drawable {        public static final int icon=0x7f020000;    }    public static final class id {        public static final int hello_world=0x7f050000;    }    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_world=0x7f040000;    }}

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?? string.xml程序清单

<?xml version="1.0" encoding="utf-8"?><resources>    <string name="hello_world">Hello World!</string>    <string name="app_name">HelloWorldDemo</string></resources>

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?? AndroidManifest.xml程序清单

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"      package="com.oristand"      android:versionCode="1"      android:versionName="1.0.0">    <application android:icon="@drawable/icon" android:label="@string/app_name">        <activity android:name=".HelloWorldActivity"                  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> 

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?运行配置

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运行结果：