在我的Android应用程序中,我有一个跟踪器活动,我根据所选日期从sqlite数据库中检索练习信息(名称,句点,燃烧的卡路里),并以线性布局显示这些信息,我的问题是当用户选择新日期时,检索到的数据显示在旧的上方的另一个“新”布局中,但实际上我想要做的是在同一布局上显示新检索的数据“用新检索的数据更改布局内容“,我已经尝试了删除所有视图方法,但它没有工作,因为数据出现几分钟然后出现
如何执行此操作:当用户选择新日期时,在同一布局上显示的新检索数据“刷新旧数据”不会以新布局显示它们。我怎么能这样做?请帮帮我..
java代码
public class Tracker extends BaseActivity
{
private Button date_btn;
private ImageButton left_btn;
private ImageButton right_btn;
private ImageView nodata;
private TextView ex_name;
private TextView ex_BCals;
private LinearLayout excercises_LL;
private LinearLayout content_LL ;
private LinearLayout notes;
private LinearLayout details;
private int year,month,day;
private double tot_excals_burned;
private Calendar localCalendar;
private static final int DATE_DIALOG_ID=0;
private boolean has_ex_details;
private boolean has_meal_details=false;
private Cursor exercises_cursor;
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.tracker);
date_btn=(Button)findViewById(R.id.btn_date);
date_btn.setText(FormatDate());
date_btn.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
localCalendar = Calendar.getInstance();
year = localCalendar.get(1);
month= localCalendar.get(2);
day = localCalendar.get(5);
showDialog(DATE_DIALOG_ID);
}
});
left_btn=(ImageButton)findViewById(R.id.btn_left);
left_btn.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
localCalendar.add(5, -1);
date_btn.setText(FormatDate(localCalendar,"EEEE, d/MMM/yyyy"));
RefreshExercisesData();
RefreshNoDataImage();
}
});
right_btn=(ImageButton)findViewById(R.id.btn_right) ;
right_btn.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
localCalendar.add(5, 1);
date_btn.setText(FormatDate(localCalendar,"EEEE, d/MMM/yyyy"));
RefreshExercisesData();
RefreshNoDataImage();
}
});
details=(LinearLayout)findViewById(R.id.ll_details);
notes=(LinearLayout)findViewById(R.id.ll_notes);
excercises_LL=(LinearLayout)findViewById(R.id.ll_exercises);
nodata=(ImageView)findViewById(R.id.nodata_imgV);
RefreshExercisesData();
RefreshNoDataImage();
}
private String FormatDate()
{
localCalendar = Calendar.getInstance();
return new SimpleDateFormat("EEEE, d/MMM/yyyy").format(localCalendar.getTime());
}
private String FormatDate(int year, int month, int day)
{
localCalendar = Calendar.getInstance();
localCalendar.set(year, month, day);
return new SimpleDateFormat("EEEE, d/MMM/yyyy").format(localCalendar.getTime());
}
private String FormatDate(Calendar calendar , String format)
{
return new SimpleDateFormat(format).format(calendar.getTime());
}
private void RefreshExercisesData()
{
tot_excals_burned=0;
DBAdapter db = new DBAdapter(this);
db.open();
String selected_date= date_btn.getText().toString();
Log.e("date", selected_date);
exercises_cursor = db.getExerciseInfo(selected_date);
if(exercises_cursor.getCount() !=0 )
{
has_ex_details=true;
details.setVisibility(0);
nodata.setVisibility(8);
notes.setVisibility(0);
//excercises_LL.removeAllViews();
excercises_LL.setWeightSum(1.0F);
excercises_LL.setVisibility(0);
excercises_LL.setOrientation(LinearLayout.VERTICAL);
LayoutInflater exc_LayoutInflater = (LayoutInflater)getApplicationContext().getSystemService("layout_inflater");
LinearLayout layout = (LinearLayout)exc_LayoutInflater.inflate(R.layout.tracker_header_item,null);
TextView tot_ex_cals_value=((TextView)(layout).findViewById(R.id.tv_tot_cals_value));
TextView exs_title=((TextView)(layout).findViewById(R.id.tv_item_title)) ;
exs_title.setText("Exercises ");
(layout).setPadding(0, 36, 0, 0);
excercises_LL.addView((View)layout, 0);
int i = 1;
if (exercises_cursor.moveToFirst())
{
do
{
content_LL=new LinearLayout(this);
ex_name=new TextView(this);
ex_name.setText( exercises_cursor.getFloat(1)+"," +exercises_cursor.getString(0) + "min ");
ex_name.setTextColor(R.color.black);
content_LL.addView(ex_name,0);
ex_BCals=new TextView(this);
ex_BCals.setText(Round(exercises_cursor.getFloat(2)) +" ");
ex_BCals.setTextColor(R.color.color_black);
content_LL.addView(ex_BCals,1);
tot_excals_burned = tot_excals_burned+exercises_cursor.getFloat(2);
excercises_LL.addView(content_LL, i);
i++;
}
while (exercises_cursor.moveToNext());
}
tot_ex_cals_value.setText(Round(tot_excals_burned) );
}
else if(exercises_cursor.getCount()==0 ||tot_excals_burned==0)
{
has_ex_details=false;
RefreshNoDataImage();
}
exercises_cursor.close();
exercises_cursor.deactivate();
db.close();
}
private void RefreshNoDataImage()
{
if(has_ex_details==false && has_meal_details==false)
{
notes.setVisibility(8);
excercises_LL.setVisibility(8);
nodata.setImageResource(R.drawable.bg_nodata);
nodata.setVisibility(View.VISIBLE);
}
else
nodata.setVisibility(8);
}
protected Dialog onCreateDialog(int id)
{
switch (id) {
case DATE_DIALOG_ID:
return new DatePickerDialog(this, mDateSetListener, this.year, this.month, this.day);
}
return null;
}
private DatePickerDialog.OnDateSetListener mDateSetListener = new DatePickerDialog.OnDateSetListener()
{
public void onDateSet(DatePicker paramDatePicker, int year, int monthofYear, int dayofMonth)
{
Tracker.this.year=year;
month=monthofYear;
day=dayofMonth;
date_btn.setText(FormatDate(year,month,day));
RefreshExercisesData();
RefreshNoDataImage();
}
};
private String Round(double num) {
return String.format("%.1f%n", num);
}}
答案 0 :(得分:0)
如果您希望我们查看任何代码示例,您似乎需要编辑您的问题。
如果这只是练习的几个文本,那么在布局xml中提供这些视图ID就足够了,因此可以在您的活动中引用它们。
然后,您可以使用OnCreate中的findViewById获取您的观看次数,当您收到新练习的数据时,您可以使用例如TextView.setText()。
答案 1 :(得分:0)
如果您有布局,例如:
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/name_textview"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
<TextView
android:id="@+id/calories_burned_textview"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</RelativeLayout>
然后在您可以从sqlite数据库访问数据的Activity中,您可以通过查找视图并使用setText方法修改此布局中的现有文本视图。
// load new data occurs above, now want to set
TextView name = (TextView)findViewById(R.id.name_textview);
name.setText(newName);
TextView calsBurned = (TextView)findViewById(R.id.calories_burned_textview);
calsBurned.setText(newCalsBurned);
根据您的描述中的声音,您可以在每次单击某个加载按钮时通过代码将这些文本视图添加到活动中。您可以执行此操作,只需保留对添加的这些文本视图的引用,并在以后加载新条目时使用setText()(但不要再次创建文本视图)。