android开发综合使用之打分应用

android开发综合应用之打分应用

该程序是一个listView跟ratingbar综合的应用示例。先上代码如下：

main.java

  

import java.util.ArrayList;
import java.util.List;

import android.app.AlertDialog;
import android.app.ListActivity;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.RatingBar;
import android.widget.SimpleAdapter;
import android.widget.TextView;
import android.widget.AdapterView.OnItemSelectedListener;

public class Main extends ListActivity
{	
	private static String[] applicationNames = new String[]
	{ "多功能日历", "eoeMarket客户端", "耐玩的重力消砖块", "白社会", "电池管家" };
	private static String[] authors = new String[]
	{ "张三", "eoemobile", "小费", "ApkHome", "lucyfa" };
	private static int[] resIds = new int[]
	{ R.drawable.calendar, R.drawable.eoemarket, R.drawable.brick,
			R.drawable.whitesociety, R.drawable.terminater };
	private static float[] applicationRating = new float[]
	{ (float) 5.0, (float) 5.0, (float) 3.5, (float) 5.0, (float) 4.0 };
	String inflater = Context.LAYOUT_INFLATER_SERVICE;
	LayoutInflater layoutInflater;
	private RatingAdapter raAdapter;
	/**
	 * 自定义适配器，
	 * 因为simpleAdapter只支持textView,imagesView,或是想Checkable接口的类，所以这里不能使用；
	 * @author lyj
	 *
	 */
	private class RatingAdapter extends BaseAdapter
	{
		private Context context;

		public RatingAdapter(Context context)
		{
			this.context = context;
			//获取扩展对象，用于操作布局文件
			layoutInflater = (LayoutInflater) context
					.getSystemService(inflater);
		}

		@Override
		public int getCount()
		{
			return applicationNames.length;
		}

		@Override
		public Object getItem(int position)
		{
			return applicationNames[position];
		}

		@Override
		public long getItemId(int position)
		{
			return position;
		}

		public void setRating(int position, float rating)
		{
			applicationRating[position] = rating;
			//更新数据
			notifyDataSetChanged();
		}
		/**
		 * 设置列表项值，返回定义视图
		 */
		@Override
		public View getView(int position, View convertView, ViewGroup parent)
		{
			//获取布局对象，进行布局文件里的组件操作
			LinearLayout linearLayout = (LinearLayout) layoutInflater.inflate(
					R.layout.main, null);
			ImageView ivLogo = (ImageView) linearLayout
					.findViewById(R.id.ivLogo);
			TextView tvApplicationName = ((TextView) linearLayout
					.findViewById(R.id.tvApplicationName));
			TextView tvAuthor = (TextView) linearLayout
					.findViewById(R.id.tvAuthor);
			TextView tvRating = (TextView) linearLayout
					.findViewById(R.id.tvRating);
			RatingBar ratingBar = (RatingBar) linearLayout
					.findViewById(R.id.ratingbar);
			ivLogo.setImageResource(resIds[position]);
			tvApplicationName.setText(applicationNames[position]);
			tvAuthor.setText(authors[position]);
			tvRating.setText(String.valueOf(applicationRating[position]));
			ratingBar.setRating(applicationRating[position]);
			return linearLayout;
		}
	}

	@Override
	protected void onListItemClick(ListView l, View view, final int position,
			long id)
	{
		View myView = getLayoutInflater().inflate(R.layout.rating, null);
		final RatingBar ratingBar = (RatingBar) myView
				.findViewById(R.id.ratingbar);
		ratingBar.setRating(applicationRating[position]);
		new AlertDialog.Builder(this).setTitle(applicationNames[position])
				.setMessage("给应用程序打分").setIcon(resIds[position])
				.setView(myView).setPositiveButton("确定", new OnClickListener()
				{

					@Override
					public void onClick(DialogInterface dialog, int which)
					{
						raAdapter.setRating(position, ratingBar.getRating());
						
					}
				}).setNegativeButton("取消", null).show();
	}

	@Override
	public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);

		List<View> viewList = new ArrayList<View>();
		viewList.add(getLayoutInflater().inflate(R.layout.main, null));
		raAdapter = new RatingAdapter(this);
		setListAdapter(raAdapter);
		

	}
}

 程序中使用到了自定义的适配器，不熟悉adapter的朋友可以先去查阅下资料。

 

布局文件：

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:orientation="horizontal" android:layout_width="fill_parent"
	android:layout_height="wrap_content" android:gravity="center_vertical">
	<ImageView android:id="@+id/ivLogo" android:layout_width="60dp"
		android:layout_height="60dp" android:src="@drawable/icon"
		android:paddingLeft="5dp" />
	<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
		android:orientation="vertical" android:layout_width="wrap_content"
		android:layout_height="wrap_content" android:gravity="right"
		android:padding="10dp">
		<TextView android:id="@+id/tvApplicationName"
			android:layout_width="wrap_content" android:layout_height="wrap_content"
			android:textSize="16dp" />
		<TextView android:id="@+id/tvAuthor" android:layout_width="wrap_content"
			android:layout_height="wrap_content" android:layout_below="@id/tvApplicationName"
			android:textSize="14dp" />
	</RelativeLayout>
	<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
		android:orientation="vertical" android:layout_width="fill_parent"
		android:layout_height="wrap_content" android:gravity="right"
		android:padding="10dp">
		<TextView android:id="@+id/tvRating" android:layout_width="wrap_content"
			android:layout_height="wrap_content" android:text="5.0" />
		<RatingBar android:id="@+id/ratingbar" android:layout_width="wrap_content"
			android:layout_height="wrap_content" android:numStars="5"
			style="?android:attr/ratingBarStyleSmall" android:layout_below="@id/tvRating" />
	</RelativeLayout>
</LinearLayout>

 

弹出对话框的布局文件：

rating.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:orientation="horizontal" android:layout_width="fill_parent"
	android:layout_height="wrap_content" android:gravity="center_vertical">
	<RatingBar android:id="@+id/ratingbar" android:layout_width="wrap_content"
		android:layout_height="wrap_content" android:numStars="5"/>
</LinearLayout>

 运行结果：