通过Button改变TextView文字颜色

res/layout/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:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:id="@+id/tvText" android:text="@string/tv_name"/>
<Button android:layout_width="wrap_content" 
		android:id="@+id/btnChangeColor" 
		android:layout_height="wrap_content" 
		android:text="@string/btn_name"></Button>
</LinearLayout>

src/ex03_12.java

package gphone.ex03_12;


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

public class EX03_12 extends Activity {
	Button btnChangeColor=null;
	TextView tvText=null;
	//用于存储颜色
	int[] colors=null;
	int color_index;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        //存储颜色
        colors=new int[]{
        		Color.RED,
        		Color.BLUE,
        		Color.YELLOW,
        		Color.GREEN,
        		Color.GRAY
        };
        color_index=0;
        tvText=(TextView)EX03_12.this.findViewById(R.id.tvText);
        btnChangeColor=(Button)EX03_12.this.findViewById(R.id.btnChangeColor);
        
        btnChangeColor.setOnClickListener(new Button.OnClickListener(){
        	
			@Override
			public void onClick(View v) {
				// 按顺序显示定义的颜色
				if(color_index<colors.length)
				{
					tvText.setTextColor(colors[color_index]);				}
				else
				{
					color_index=0;
                                              color_index++;

				}
				
			}
        	
        });
        
    }
}

运行结果