Android學習筆記 - Hello World

使用TextView秀出Hello World

1. MainActivity.java

package org.me.android_helloworld;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class MainActivity extends Activity {
    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        //設定要使用的layout
        setContentView(R.layout.main);
        //取得TextView物件
        TextView view = (TextView) findViewById(R.id.textView);
        view.setText("hellworld");
    }
}

2. main.xml

<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:layout_width="fill_parent"
              android:layout_height="fill_parent">
    <TextView
        android:id="@+id/textView"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"/>
</LinearLayout>

3. AndroidManifest.xml

<?xml version="1.0" encoding="UTF-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="org.me.android_helloworld">
    <application>
         <activity android:name=".MainActivity" android:label="MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>
    </application>
</manifest>

4. 結果