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在我的Android应用程序中，我有一个跟踪器活动，在该活动中，我根据所选日期从sqlite数据库中检索练习信息（名称，句号，燃烧的卡路里），并以线性布局显示这些信息，用户选择新的日期检索到的数据显示在另一个“新”布局显示在旧的布局上方，但实际上我想要做的是在同一个布局上显示新的检索到的数据“用新检索的数据更改布局内容” ，我试图删除所有视图的方法，但它没有工作，因为数据出现几分钟，然后DIS出现如何更改布局的内容？
我怎么能做到这一点：当用户选择一个新的日期新的检索数据显示在同一个布局“通过新的数据刷新旧数据”而不是以新的布局显示它们。我该怎么做？请帮助我..
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);
}}
谢谢，我已经尝试了你在我发布我的问题之前所说的话，并尝试这种方法“在活动中创建文本视图”，问题仍然存在。 你知道另一种方法吗？ – Roba