更改TextView背景色——编码定义颜色

res/values/color.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="red">#ffff0000</color>
</resources>

src/EX03_03.java

package gphone.ex03_03;

import android.app.Activity;
import android.content.res.Resources;
import android.os.Bundle;
import android.widget.TextView;
public class EX03_03 extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Resources resources=this.getBaseContext().getResources();
        int color=resources.getColor(R.color.red);
        TextView tv=(TextView)this.findViewById(R.id.text);
        tv.setBackgroundColor(color);
    }
}

或颜色在编码时定义使用系统定义颜色：

package gphone.ex03_03;

import android.app.Activity;
import android.content.res.Resources;
import android.os.Bundle;
import android.widget.TextView;
public class EX03_03 extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        /*Resources resources=this.getBaseContext().getResources();
        int color=resources.getColor(R.color.red);*/
        TextView tv=(TextView)this.findViewById(R.id.text);
        
        tv.setBackgroundColor(android.graphics.Color.RED);
    }
}