作业5

 

 

 

 

 

 

 

 

 

 

 

 

<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"
    android:id="@+id/zyh"
    tools:context="com.example.jhk.MainActivity" >

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="131dp"
        android:onClick="asd"
        android:text="改变颜色" />

</RelativeLayout>

package com.example.jhk;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.AliasActivity;
import android.content.DialogInterface;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;

public class MainActivity extends Activity {
    String[] a = {"#000000", "#FF33CC", "#3300FF", "#CC0033", "#9900CC"};
    int s = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    public void asd(View view) {
        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", "粉色", "蓝色", "红色", "紫色"}, s, 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
                        s = 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
                        findViewById(R.id.zyh).setBackgroundColor(Color.parseColor(a[s]));
                        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();

    }


}