我的 android 应用程序中有一个Horizo ntalScrollView,里面有40 个按钮,我想实现一个侦听器,它根据单击的按钮从数据库中检索数据,例如:
如果单击了1号按钮,则侦听器应从数据库中检索与第 1 周相关的数据
我是否必须为每个按钮实现一个侦听器,或者有什么方法可以知道单击了哪个按钮并使用一个侦听器来侦听所有按钮,并更改按钮编号和检索周数?
数据库查询方法
DataBaseHelper myDbHelper = new DataBaseHelper(this);
SQLiteDatabase db = myDbHelper.getReadableDatabase();
String selectWebQuery = "select * from zweeks where zweeks_id = " + weekSince ;
Cursor cursor = db.rawQuery(selectWebQuery, null);
int CurrentDay=(int) (numberOfDaysSince%7);
if(CurrentDay==0)CurrentDay=7;
System.out.println("current Day="+CurrentDay);
String string1 =null;
String string2 = null;
String string3 = null;
String string4 = null;
String string5 = null;
String string6 = null;
String string7 = null;
String tags=null;
if (cursor != null)
{ cursor.moveToFirst();
string1 = cursor.getString(1);
string2 = cursor.getString(2);
string3 = cursor.getString(3);
string4 = cursor.getString(4);
string5 = cursor.getString(5);
string6 = cursor.getString(6);
string7 = cursor.getString(7);
String tags1 ="<head><style>body{float:right;text-align:right;word-wrap: break-word; }</style><meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\" /></head><body>";
switch(CurrentDay){
case 1:tags=tags1+string1+"<img src=\"file:///android_res/drawable/dottedline.png\" />"+string2+"<br><br>"+string3+"<br><br>"+string4+"<br><br>"+string5+"<br><br>"+string6+"<br><br>"+string7+"<img src=\"file:///android_res/drawable/line.png\" /><br>" ;
break;
case 2:tags=tags1+string2+"<br><img src=\"file:///android_res/drawable/dottedline.png\" /><br>"+string3+"<br><br>"+string4+"<br><br>"+string5+"<br><br>"+string6+"<br><br>"+string7+"<br><img src=\"file:///android_res/drawable/line.png\" /><br>"+string1+"<br>" ;
break;
case 3:tags=tags1+string3+"<br><img src=\"file:///android_res/drawable/dottedline.png\" /><br>"+string4+"<br><br>"+string5+"<br><br>"+string6+"<br><br>"+string7+"<br><img src=\"file:///android_res/drawable/line.png\" /><br>"+string1+"<br><br>"+string2+"<br>" ;
break;
case 4:tags=tags1+string4+"<br><img src=\"file:///android_res/drawable/dottedline.png\" /><br>"+string5+"<br><br>"+string6+"<br><br>"+string7+"<br><img src=\"file:///android_res/drawable/line.png\" /><br>"+string1+"<br><br>"+string2+"<br><br>"+string3+"<br><br>" ;
break;
case 5:tags=tags1+string5+"<br><img src=\"file:///android_res/drawable/dottedline.png\" /><br>"+string6+"<br><br>"+string7+"<br><img src=\"file:///android_res/drawable/line.png\" /><br>"+string1+"<br><br>"+string2+"<br><br>"+string3+"<br><br>"+string4+"<br><br>" ;
break;
case 6:
tags=tags1+string6+"<br><img src=\"file:///android_res/drawable/dottedline.png\" /><br>"+string7+"<br><img src=\"file:///android_res/drawable/line.png\" /><br>"+string1+"<br><br>"+string2+"<br><br>"+string3+"<br><br>"+string4+"<br><br>"+string5+"<br><br>" ;
break;
case 7:
tags=tags1+string7+"<br><img src=\"file:///android_res/drawable/dottedline.png\" /><br>"+string1+"<br><br>"+string2+"<br><br>"+string3+"<br><br>"+string4+"<br><br>"+string5+"<br><br>"+string6+"<br><br>" ;
break;
}
}
webView.loadDataWithBaseURL("file:///android_res/drawable/", tags, "text/html", "UTF-8", null);
}
这句话应该是动态的,取决于点击的按钮
- String selectWebQuery = "select * from zweeks where zweeks_id = " + weekSince ;
提前致谢。