Mazs's Notes

1.可在xml檔中修改,紅色那條

<?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"
    >

</LinearLayout>

2.在Activity程式中修改(先在xml的layout加入id如上圖綠色 )

package com.AndroidBackground;

import android.app.Activity;
import android.graphics.Color;//這行要自己import
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);
        //R.id.back的back是xml裡的Layout的id
        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) {
	//下行為設定
     background.setBackgroundColor(Color.RED);
	//或是
     background.setBackgroundColor(Color.parseColor("色碼")
)
    }
         });
        
        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);
        }
             });
    }
}

color的話有分import的Color可以用 也可以自訂color.xml檔

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <drawable name="red">#7f00</drawable>
</resources>

但是自訂又要在程式裡設定的話要加比較多東西

private Drawable myDeawable;
private LinearLayout l;

l=(LinearLayout) findViewById(R.id.layout的id);
Resources resources = getBaseContext().getResources();
myDeawable = resources.getDrawable(R.drawable.red);//R.drawable.red為xml裡設定的顏色

l.setBackgroundDrawable(myDeawable);