設定及更改背景顏色

可以通過XML或程序代碼設定及更改Android的背景顏色



創建一個Android Application, AndroidBackground. 並根據下面的例子修改佈局文件(/res/layout/main.xml)及主程序(AndroidBackground.java).

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:id="@+id/back"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#ff000000"
    >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
<Button
 android:id="@+id/red"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="Red"
 />
<Button
 android:id="@+id/green"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="Green"
 />
<Button
 android:id="@+id/blue"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="Blue"
 />
</LinearLayout>

AndroidBackground.java

package com.AndroidBackground;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;

public class AndroidBackground extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        final LinearLayout background = (LinearLayout)findViewById(R.id.back);
        Button buttonRed = (Button)findViewById(R.id.red);
        Button buttonGreen = (Button)findViewById(R.id.green);
        Button buttonBlue = (Button)findViewById(R.id.blue);
        
        buttonRed.setOnClickListener(
         new Button.OnClickListener(){

    public void onClick(View v) {
     // TODO Auto-generated method stub
     background.setBackgroundColor(Color.RED);
    }
         });
        
        buttonGreen.setOnClickListener(
             new Button.OnClickListener(){

        public void onClick(View v) {
         // TODO Auto-generated method stub
         background.setBackgroundColor(Color.GREEN);
        }
             });        
        buttonBlue.setOnClickListener(
             new Button.OnClickListener(){

        public void onClick(View v) {
         // TODO Auto-generated method stub
         background.setBackgroundColor(Color.BLUE);
        }
             });
    }
}

從這個例子可以看到背景顏色可以通過修改XML的android:background設定, 或通過程序代碼setBackgroundColor()而更改.