我在列表视图中显示今天日期数据库中的内容，我想添加点击日期按钮的功能，显示上一日期的内容。但是它显示了两个日期的数据。它将它添加到相同的列表视图中。如何解决？
prevMonth.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
c.add(Calendar.DATE, -1);
formattedDate = df.format(c.getTime());
Log.v("PREVIOUS DATE : ", formattedDate);
currentDate.setText(formattedDate);
new getfooditems().execute();//calling method of different class which displays the data in the list
//ListView lv = getListView();
}
});
class getfooditems extends AsyncTask<String, String, String> {
private String foodname;
private String totalcalorie;
private String fat;
private String carbohydrate;
private String protein;
private String foodtype;
private String created_at;
//private String category;
@Override
protected void onPreExecute() {
super.onPreExecute();
CalorieDMealsDiaryActivity.this.setProgressBarIndeterminateVisibility(true);
}
@Override
protected String doInBackground(String... params) {
DatabaseHandler helper = new DatabaseHandler(getApplicationContext());
SQLiteDatabase db = helper.getReadableDatabase();
String query = "SELECT foodname,foodtype,totalcalorie,fat,carbohydrate,protein,created_at from fooditem WHERE name = ('"+fname+"') AND created_at = ('"+formattedDate+"')";
Cursor cursor = db.rawQuery(query,null);
// Building Parameters
List<NameValuePair> parametres = new ArrayList<NameValuePair>();
// there is some record available in the cursor
if (!cursor.isAfterLast()) {
cursor.moveToFirst();
while (!cursor.isAfterLast()) {
foodname = cursor.getString(0);
System.out.println("value of foodname in meals diary activity" + foodname);
foodtype = cursor.getString(1);
System.out.println("meals diary foodtype" + foodtype);
totalcalorie= cursor.getString(2);
fat = cursor.getString(3);
carbohydrate = cursor.getString(4);
protein = cursor.getString(5);
created_at = cursor.getString(6);
System.out.println("value of totalcalorie in meals diary activity " + totalcalorie);
Log.e("foodtype" , foodtype);
// creating new HashMap
HashMap<String, String> breakfastmap = new HashMap<String, String>();
HashMap<String, String> lunchmap = new HashMap<String, String>();
HashMap<String, String> dinnermap = new HashMap<String, String>();
HashMap<String, String> snacksmap = new HashMap<String, String>();
// adding each child node to HashMap key => value
if(foodtype.equals("Breakfast")){
breakfastmap.put(TAG_FOODNAME, foodname);
Log.e("foodname","foodname:" + foodname);
breakfastmap.put(TAG_TOTALCALORIE, totalcalorie);
Log.e("totalcalorie","totalcalorie:" + totalcalorie);
breakfastmap.put(TAG_FAT, fat);
Log.e("fat","fat:" + fat);
breakfastmap.put(TAG_CARBOHYDRATE, carbohydrate);
Log.e("carbohydrate","carbohydrate:" + carbohydrate);
breakfastmap.put(TAG_PROTEIN, protein);
Log.e("protein","protein:" + protein);
breakfastmap.put(TAG_CREATED_AT, created_at);
Log.e("created_at","created_at:" + created_at);
// adding HashList to ArrayList
breakfastitems.add(breakfastmap);
cursor.moveToNext();
}
else if(foodtype.equals("Lunch")){
lunchmap.put(TAG_FOODNAME, foodname);
Log.e("foodname","foodname:" + foodname);
lunchmap.put(TAG_TOTALCALORIE, totalcalorie);
Log.e("totalcalorie","totalcalorie:" + totalcalorie);
lunchmap.put(TAG_FAT, fat);
Log.e("fat","fat:" + fat);
lunchmap.put(TAG_CARBOHYDRATE, carbohydrate);
Log.e("carbohydrate","carbohydrate:" + carbohydrate);
lunchmap.put(TAG_PROTEIN, protein);
Log.e("protein","protein:" + protein);
lunchmap.put(TAG_CREATED_AT, created_at);
Log.e("created_at","created_at:" + created_at);
// adding HashList to ArrayList
lunchitems.add(lunchmap);
cursor.moveToNext();
}
else if(foodtype.equals("Dinner")){
dinnermap.put(TAG_FOODNAME, foodname);
Log.e("foodname","foodname:" + foodname);
dinnermap.put(TAG_TOTALCALORIE, totalcalorie);
Log.e("totalcalorie","totalcalorie:" + totalcalorie);
dinnermap.put(TAG_FAT, fat);
Log.e("fat","fat:" + fat);
dinnermap.put(TAG_CARBOHYDRATE, carbohydrate);
Log.e("carbohydrate","carbohydrate:" + carbohydrate);
dinnermap.put(TAG_PROTEIN, protein);
Log.e("protein","protein:" + protein);
dinnermap.put(TAG_CREATED_AT, created_at);
Log.e("created_at","created_at:" + created_at);
// adding HashList to ArrayList
dinneritems.add(dinnermap);
cursor.moveToNext();
}
else if(foodtype.equals("Snacks")){
snacksmap.put(TAG_FOODNAME, foodname);
Log.e("foodname","foodname:" + foodname);
snacksmap.put(TAG_TOTALCALORIE, totalcalorie);
Log.e("totalcalorie","totalcalorie:" + totalcalorie);
snacksmap.put(TAG_FAT, fat);
Log.e("fat","fat:" + fat);
snacksmap.put(TAG_CARBOHYDRATE, carbohydrate);
Log.e("carbohydrate","carbohydrate:" + carbohydrate);
snacksmap.put(TAG_PROTEIN, protein);
Log.e("protein","protein:" + protein);
snacksmap.put(TAG_CREATED_AT, created_at);
Log.e("created_at","created_at:" + created_at);
// adding HashList to ArrayList
snacksitems.add(snacksmap);
cursor.moveToNext();
}
else{
System.out.println("Nonononono");
}
}
}
// there is some record available in the cursor
cursor.close();
return query;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String result) {
CalorieDMealsDiaryActivity.this
.setProgressBarIndeterminateVisibility(false);
// updating UI from Background Thread
runOnUiThread(new Runnable() {
public void run() {
/**
* Updating parsed JSON data into ListView
* */
System.out.println("foodtype in run" + foodtype);
System.out.println("I am inside run() hahahaha");
adapter = new SimpleAdapter(
CalorieDMealsDiaryActivity.this, breakfastitems,
R.layout.list_xml, new String[] {TAG_FOODNAME ,TAG_TOTALCALORIE,TAG_FAT,TAG_CARBOHYDRATE,TAG_PROTEIN}, new int[] {
R.id.name,R.id.uid, R.id.fatout,R.id.carbsout,R.id.proteinsout });
adapterlunch = new SimpleAdapter(
CalorieDMealsDiaryActivity.this, lunchitems,
R.layout.list_lunch_xml, new String[] {TAG_FOODNAME ,TAG_TOTALCALORIE,TAG_FAT,TAG_CARBOHYDRATE,TAG_PROTEIN}, new int[] {
R.id.name,R.id.uid, R.id.fatout,R.id.carbsout,R.id.proteinsout });
adapterdinner = new SimpleAdapter(
CalorieDMealsDiaryActivity.this, dinneritems,
R.layout.list_dinner_xml, new String[] {TAG_FOODNAME ,TAG_TOTALCALORIE,TAG_FAT,TAG_CARBOHYDRATE,TAG_PROTEIN}, new int[] {
R.id.name,R.id.uid, R.id.fatout,R.id.carbsout,R.id.proteinsout });
adaptersnacks = new SimpleAdapter(
CalorieDMealsDiaryActivity.this, snacksitems,
R.layout.list_snacks_xml, new String[] {TAG_FOODNAME ,TAG_TOTALCALORIE,TAG_FAT,TAG_CARBOHYDRATE,TAG_PROTEIN}, new int[] {
R.id.name,R.id.uid, R.id.fatout,R.id.carbsout,R.id.proteinsout });
listbreakfast.setAdapter(adapter);
listlunch.setAdapter(adapterlunch);
listdinner.setAdapter(adapterdinner);
listsnacks.setAdapter(adaptersnacks);
}
});
}
}
答案 0 :(得分：0)
你做了很多复杂的事情我认为要获得当前或以前的日期。
只需你可以做到上一次。
Calendar cal = Calendar.getInstance();
int currentDate = cal.get(Calendar.DATE) -1;//prev date , remove -1 for current date.
当我们需要在月份日期和所有日期格式化日期时，我们正在使用SimpleDateFormate ...
这样做可以重新加载listview .... asynch任务声明上面的所有列表视图
onprepare 而不是初始化准备
中的所有列表 doinbackground中的在使用前清除所有列表
而不是适应后期......
希望你能解决问题
答案 1 :(得分：0)
在从数据库中读取新记录之前，清除所有arraylist中的所有先前项目，如：
breakfastitems.clear();
lunchitems.clear();
dinneritems.clear();
snacksitems.clear();
它将解决您的问题