来源: 互联网  发布时间: 2014-02-18

定义各种事物的类型
今天看android 的源代码是发现了一个关于定义事物的类型的做法，我觉得挺好的，以前写代码的时候就没有想到这样的好方法：
例子：
public static final int INCLUDE_IMAGES = (1 << 0);

public static final int INCLUDE_DRM_IMAGES = (1 << 1);

public static final int INCLUDE_VIDEOS = (1 << 2);
--->用int 数据类型来标志各种不同的类型，并且通过1左移不同位数获得不同的int

在使用的时候
if ((inclusion & INCLUDE_IMAGES) != 0)

if ((inclusion & INCLUDE_VIDEOS) != 0)
--->通过与来确定是那一类型

我不知道这样写的代码是否效率更高，但我觉得android的源代码写出这样的代码应该是值得我借鉴的！

    

    来源: 互联网  发布时间: 2014-02-18

Adapter增加选中状态

import java.util.List;
import java.util.Map;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import com.tcad.util.WebTools;

public class MyArrayAdapter extends BaseAdapter{

	private static List<Map<String,String>> list;
	
	private LayoutInflater mInflater;
	
	private ViewHolder holder;
	//alertdialog 被选中初始化false
	private static boolean[] isFocused ;
	
	private static int whichClick = -1;
	
	public MyArrayAdapter(Context context,List<Map<String,String>> objects){
		
		list = objects;
		
		mInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
		
		isFocused = new boolean[objects.size()];
		
		for(int i=0;i<objects.size();i++){
			
			isFocused[i] = false;
		}
	}
	
	public int getCount() {
		
		return list.size();
	}

	public Object getItem(int position) {
		
		return list.get(position);
	}

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

	public void changeBg(int position){
		
		isFocused[whichClick==-1?0:whichClick] = false;
		
		whichClick = position;
		
		isFocused[position] = true;
		
		notifyDataSetChanged();
	}
	
	public View getView(int position, View convertView, ViewGroup parent) {
		
		if (convertView == null) {
			
            convertView = mInflater.inflate(R.layout.musiccategories, null);

            holder = new ViewHolder();
            
            holder.s_Name = (TextView) convertView.findViewById(R.id.s_name);
            
            convertView.setTag(holder);
        } else {
            // Get the ViewHolder back to get fast access to the TextView
            // and the ImageView.
            holder = (ViewHolder) convertView.getTag();
        }
		
		convertView.setBackgroundResource(isFocused[position]?android.R.drawable.alert_dark_frame:android.R.drawable.alert_light_frame);
		
		holder.s_Name.setText(list.get(position).get(WebTools.SON_GEMING));
		
		return convertView;
	}

	static class ViewHolder {
		
        TextView s_Name;
        
    }
}

 

掉 MyArrayAdapter 的changeBg(int)就可以改变该项的背景

    

    来源: 互联网  发布时间: 2014-02-18

视力检查(EyeGuard)

• 本软件在手机系统桌面上生成如下图所示图标：
   (This software system in mobile desktop ICONS generated as shown below:)






• 运行该程序后，出现如下主界面：
  (Run this program, appear as follows the interface:)





开始(Start):
          点击后进入该测试界面；
          (Click this button,will appear the game interface;)

• 界面截图：
   (screenshots of the game;)

注意：如果你遇到问题，请发送邮件至：junefsh.android@gmail.com
(Attention:If you have some troubles ,please contact to me : junefsh.android@gmail.com)