作业二之SharedPreferences,CustomAdapter(Android)

       作业要求是用tab和grid做一个课程表app,而且要在grid下显示一个虚拟时钟,要求比较简单而且自由,我自己加了些其他功能进去,这次自我学习让我学习到了很多东西,包括动态生成UI等的实现方法,效率方面是我编程生涯一直以来时刻都在考虑的东西,这次的代码也能很好的体现出来,当然里面的TextView控件可以控制在一个tab内的级别,由于有些疏懒而直接把所有Grid内的TextView都独立出来了.

       后记:倒回来编辑之前的作业,发现很多地方都不成熟,例如Adapter的getview方法,最好使用holder的设计方法来防止内存泄露(http://blog.csdn.net/syfyw/article/details/8145653).而且数据储存入sqlite更加好.

 

界面视图:

(虚拟机下)

(实机测试)

MainActivity代码:

package com.fp.homework2;

import android.os.Bundle;
import android.app.AlertDialog;
import android.app.TabActivity;

import android.widget.BaseAdapter;
import android.widget.TabHost;
import android.widget.TextView;
import android.widget.GridView;
import android.widget.AnalogClock;
import android.widget.LinearLayout;
import android.widget.Toast;
import android.widget.EditText;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.Gravity;

import android.content.DialogInterface;
import android.content.SharedPreferences;  
import android.content.SharedPreferences.Editor;  


public class MainActivity extends TabActivity implements TabHost.TabContentFactory {
	private TabHost tabHost;
	private GridView grid;
	@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        getGridTextViews();
        tabHost = getTabHost();
        tabHost.addTab(tabHost.newTabSpec("tab1")
                .setIndicator("星期一", getResources().getDrawable(R.drawable.star_big_on))
                .setContent(this));
        tabHost.addTab(tabHost.newTabSpec("tab2")
                .setIndicator("星期二", getResources().getDrawable(R.drawable.star_big_on))
                .setContent(this));
        tabHost.addTab(tabHost.newTabSpec("tab3")
                .setIndicator("星期三", getResources().getDrawable(R.drawable.star_big_on))
                .setContent(this));
        tabHost.addTab(tabHost.newTabSpec("tab4")
                .setIndicator("星期四", getResources().getDrawable(R.drawable.star_big_on))
                .setContent(this));
        tabHost.addTab(tabHost.newTabSpec("tab5")
                .setIndicator("星期五", getResources().getDrawable(R.drawable.star_big_on))
                .setContent(this));
        
        Toast.makeText(MainActivity.this, "点击可修改具体课程",Toast.LENGTH_SHORT).show();
        
    }
	
	 @Override  
	protected void onDestroy() {
		 saveToFile();
		 Toast.makeText(MainActivity.this, "已保存课表信息",Toast.LENGTH_SHORT).show();
		 super.onDestroy();  
	}  
	
	public void saveToFile()
	{
		SharedPreferences preferences = getSharedPreferences("classinfo",0);
        Editor edit=preferences.edit();
        
		for(int i=0;i<5;i++)
        {
        	for(int j=0;j<35;j++)
        	{
        		if(((j>5)&&(j<9))||((j>10)&&(j<14))||((j>15)&&(j<19))||((j>20)&&(j<24))||((j>25)&&(j<29))||((j>30)&&(j<34)))
        		{
        			if(tv[i][j].getText().toString()!="点击添加")
        				edit.putString(i+","+j, tv[i][j].getText().toString());
        		}
        	}
        }
        edit.commit();  
	}
	
	//创建用于网格视图的TextViews
	public TextView tempview;
	private void getGridTextViews()
	{
		tv = new TextView[5][35];
		SharedPreferences preferences = getSharedPreferences("classinfo",0);
		
		View.OnTouchListener tl = new View.OnTouchListener() {
			@Override
			public boolean onTouch(View v, MotionEvent event) {
				if(event.getAction()==MotionEvent.ACTION_DOWN)
				{
					v.setBackgroundColor(0xffCDCDFF);
				}
				else
					v.setBackgroundColor(0xffffffff);
				return false;
			}
		};
		
		View.OnClickListener cl = new View.OnClickListener() {
			@Override
			public void onClick(View v) {
				tempview = (TextView)v;
				
				LinearLayout ll = new LinearLayout(MainActivity.this);
				TextEntry = new EditText(MainActivity.this);
				TextEntry.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT,LinearLayout.LayoutParams.WRAP_CONTENT));
				ll.addView(TextEntry);
			
				new AlertDialog.Builder(MainActivity.this)
				.setTitle("请输入")
				.setView(ll)
				.setPositiveButton("确定",new DialogInterface.OnClickListener() 
				{
					public void onClick(DialogInterface dialog,int whichButton) {
						tempview.setText(TextEntry.getText().toString());
						tempview.setTextColor(0xff000000);
						tempview.setTextSize(15);
					}
				})
				.setNegativeButton("取消",new DialogInterface.OnClickListener() 
				{
					public void onClick(DialogInterface dialog,int whichButton) {}
				})
				.create()
				.show();
			}
		};
		
		
        for(int i=0;i<5;i++)
        {
        	int constrid = 0;
        	for(int j=0;j<35;j++)
        	{
        		tv[i][j] = new TextView(this);
        		
        		tv[i][j].setGravity(Gravity.CENTER);
        		tv[i][j].setLayoutParams(new GridView.LayoutParams(GridView.LayoutParams.FILL_PARENT, 100));
        		tv[i][j].setBackgroundColor(0xffffffff); //设置背景颜色
        		
        		if(((j>5)&&(j<9))||((j>10)&&(j<14))||((j>15)&&(j<19))||((j>20)&&(j<24))||((j>25)&&(j<29))||((j>30)&&(j<34)))
        		{
        			//从配置文件中读取储存的信息
        			String pstr = preferences.getString(i+","+j, "");
            		if(pstr!="")
                    {
            			tv[i][j].setText(pstr);
            			tv[i][j].setTextColor(0xff000000);
            			tv[i][j].setTextSize(15);
                    }
                    else
                    {
                    	tv[i][j].setText("点击添加");
                    	tv[i][j].setTextColor(0xffdcdcdc);
                    	tv[i][j].setTextSize(10);
                    }
            		
        			//响应触摸事件
        			tv[i][j].setOnTouchListener(tl);
        			//响应click事件
        			tv[i][j].setOnClickListener(cl);
        		}
        		else
        		{
        			tv[i][j].setText(constr[constrid]);
        			tv[i][j].setTextColor(0xff000000);
        			tv[i][j].setTextSize(15);
        			constrid++;
        		}
        		
        	}
        }
	}
    
	public int gettab(String tab) {
		if(tab=="tab1")
        	return 0;
        else if(tab=="tab2")
        	return 1;
        else if(tab=="tab3")
        	return 2;
        else if(tab=="tab4")
        	return 3;
        else if(tab=="tab5")
        	return 4;
		
		return -1;
	}
	
	public int temptab,tempposition;
	public EditText TextEntry;
    public View createTabContent(String tab) {
        grid = new GridView(this);
        grid.setNumColumns(5);
        grid.setBackgroundColor(0xffDCDCDC);
        grid.setHorizontalSpacing(1);
        grid.setVerticalSpacing(1);
        temptab = gettab(tab);
        grid.setAdapter(new TextAdapter());
        
        AnalogClock dc = new AnalogClock(this);
        dc.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.MATCH_PARENT));
		
		//创建线性布局
		LinearLayout ll = new LinearLayout(this);
		ll.setOrientation(LinearLayout.VERTICAL);
		ll.setHorizontalGravity(Gravity.CENTER);

		ll.addView(grid);
		ll.addView(dc);
		
		
        return ll;
    }
    
    //自定义配适器
    public class TextAdapter extends BaseAdapter {
        public TextAdapter() {
        }

        public int getCount() {
            return 35;
        }

        public Object getItem(int position) {
            return position;
        }

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

        public View getView(int position, View convertView, ViewGroup parent) {
            return tv[temptab][position];
        }
    }
    
    public TextView[][] tv;
    public String[] constr = {
    		"节次",		"课程名称",	"周次",		"上课地点",	"上课时间",
    		"第一大节",	"8:30-10:05",
    		"第二大节",	"10:25-12:00",
    		"第三大节",	"13:50-15:25",
    		"第四大节",	"15:45-17:20",
    		"第五大节",	"18:20-19:55",
    		"第六大节",	"20:00-20:45"
    };
}

源码下载: http://dl.vmall.com/c03wzyimgy