5

package com.example.aaaa;

import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.RelativeLayout;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.graphics.Color;
import android.os.Bundle;


public class MainActivity extends ActionBarActivity implements OnClickListener{
    private String[] colorArr={"#000000","#ffffff","#800080","#ffa500","#ffd700"}; 
    int textcolor=1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button btn=(Button)findViewById(R.id.button1);
        btn.setOnClickListener(this);
    }
  
    
    @Override
    public void onClick(View v) {

            AlertDialog dialog;
            AlertDialog.Builder builder = new AlertDialog.Builder(this)
                    .setTitle("设置背景颜色")           //设置标题
                    .setIcon(R.drawable.ic_launcher)
                    .setSingleChoiceItems(new String[]{"黑色", "默认", "紫色", "橙色",//黑色#000000 白色#ffffff紫色 #800080橙色#ffa500金色#ffd700                            
                            "金色"}, textcolor,new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                           // 点单选按钮时发生的事件，这里which表示你点的单选按钮是第几个
                        textcolor=which;
                        
                        }
                    })
                    .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            //点确定按钮时发生的事件                            
                            ((RelativeLayout)findViewById(R.id.ly1)).setBackgroundColor(Color.parseColor(colorArr[textcolor]));
                            dialog.dismiss();
                        }
                    })//添加“确定”按钮
                    .setNegativeButton("取消", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                           // 点取消按钮发生的事件
                            dialog.dismiss();
                        }
                    });
            dialog = builder.create();
            dialog.show();
        
    }


  
}
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/ly1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.ground.MainActivity" >

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:text="设置背景颜色" />

</RelativeLayout>