作业五

package zuoyewu;

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

public class MainActivity extends ActionBarActivity implements OnClickListener, android.view.View.OnClickListener{

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button btn=(Button)findViewById(R.id.button1);
        btn.setOnClickListener(this);
    }
    String s="#FFB6C1";    
    public void onClick(View v) {

            
            AlertDialog dialog;
            AlertDialog.Builder builder = new AlertDialog.Builder(this)
                    .setTitle("设置背景颜色") 
                    .setIcon(R.drawable.ic_launcher)
                    .setSingleChoiceItems(new String[]{"红色", "紫色", "蓝色", "黄色",
                            "金色"}, 2,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
                            

                            if(which==0)
                                ((RelativeLayout)findViewById(R.id.ly1)).setBackgroundColor(Color.parseColor("#FFB6C1"));
                            if(which==1)
                                ((RelativeLayout)findViewById(R.id.ly1)).setBackgroundColor(Color.parseColor("#FF00FF"));
                            if(which==2)
                                ((RelativeLayout)findViewById(R.id.ly1)).setBackgroundColor(Color.parseColor("#0000FF"));
                            if(which==3)
                                ((RelativeLayout)findViewById(R.id.ly1)).setBackgroundColor(Color.parseColor("#FFFF00"));
                            if(which==4)
                                ((RelativeLayout)findViewById(R.id.ly1)).setBackgroundColor(Color.parseColor("FFD700"));             
                            
                        }
                    })
                    .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                        
                        
                        }
                    })//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 = builder.create();
            dialog.show();
        
    }

    @Override
    public void onClick(DialogInterface dialog, int which) {
        // TODO Auto-generated method stub
        
    }
        
    

    
}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    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.diwuci.MainActivity" 
     android:id="@+id/ly1">
    
 <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

    <Button
        android:id="@+id/button1"
        style="?android:attr/buttonStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView1"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="128dp"
        android:text="Button" />
   

</RelativeLayout>