从生成的AutoCompleteTextView $ DropDownListView获取有关AutocompleteTextView的信息

时间:2010-03-30 21:10:10

标签: android

我正在使用3个AutocompleteTextViews来建议数据库中的条目。 我将AutocompleteTextView子类化,以便在单击时将默认文本设置为null,如果移走则设置回默认指令,并且不输入任何内容。

我使用SimpleCursorAdapter绑定到视图,但我发现我无法从OnItemClickListener获取AutocompleteTextView的id,我需要在变量中的所选行中添加其他信息,具体取决于它来自哪个AutocompleteTextView。我可以访问的只是AutoCompleteTextView $ DropDownListView,它是一个未记录的内部类,似乎没有提供真正的功能。也没有办法升级视图层次结构以获取原始的AutocompleteTextView。

因此,我将SimpleCursorAdapter子类化,并在构造函数中添加了一个int,以识别适配器来自哪个AutocompleteTextView,并且我能够从传递给OnItemClick()的视图中访问它。所以,虽然我的解决方案工作正常,但我想知道是否可以从DropDownListView获取AutocompleteTextView的id?

我还在使用另一个数据库查询,它从OnItemClick获取id,然后查找该项的数据,因为我找不到将多个列转换为字符串的方法。我应该使用CursorAdapter来保存启动另一个查询吗?哦,另外一件事,我最初需要一个数据库游标(all_cursor),当我正在做的就是过滤它以获得一个新游标?看起来像是矫枉过正。

活动 ....

    dbse.openDataBase();
    Cursor all_Cursor = dbse.autocomplete_query();
    startManagingCursor(all_Cursor);
    String[] from_all = new String[]{DbAdapter.KEY_NAME};
    int[] to_all = new int[] {android.R.id.text1};
    from_adapt = new AutocompleteAdapter(FROM_DBADAPTER, this,android.R.layout.simple_dropdown_item_1line, all_Cursor, from_all, to_all);
    from_adapt.setStringConversionColumn(1);
    from_adapt.setFilterQueryProvider(this);
    to_adapt = new AutocompleteAdapter(TO_DBADAPTER, this,android.R.layout.simple_dropdown_item_1line, all_Cursor, from_all, to_all);
    to_adapt.setStringConversionColumn(1);
    to_adapt.setFilterQueryProvider(this);   
from_auto_complete = (Autocomplete) findViewById(R.id.entry_from);
from_auto_complete.setAdapter(from_adapt);
from_auto_complete.setOnItemClickListener(this);

to_auto_complete = (Autocomplete) findViewById(R.id.entry_to);
to_auto_complete.setAdapter(to_adapt);
to_auto_complete.setOnItemClickListener(this);

public void onItemClick (AdapterView<?> parent, View view, int position, long id) {
    Cursor selected_row_cursor = dbse.data_from_id(id);
    selected_row_cursor.moveToFirst();
    String lat = selected_row_cursor.getString(1);
    String lon = selected_row_cursor.getString(2);
    int source = ((AutocompleteAdapter) parent.getAdapter()).getSource();

自动完成课程:

public class Autocomplete extends AutoCompleteTextView implements  OnTouchListener,OnFocusChangeListener{

String textcontent;
Context mycontext = null;
int viewid = this.getId();

public Autocomplete(Context context, AttributeSet attrs) {
super(context, attrs);
textcontent = this.getText().toString();
mycontext = context;
this.setOnFocusChangeListener(this);     
this.setOnTouchListener(this);
}
public boolean onTouch(View v, MotionEvent event) {
if (textcontent.equals(mycontext.getString(R.string.from_textbox)) |
textcontent.equals(mycontext.getString(R.string.to_textbox)) |
textcontent.equals(mycontext.getString(R.string.via_textbox))) {
this.setText("");
}
return false;
}
public void onFocusChange(View v, boolean hasFocus) {
if (hasFocus == false) {
int a = this.getText().length();
if (a == 0){
if (viewid == R.id.entry_from) {this.setText(R.string.from_textbox);}
if (viewid == R.id.entry_to) {this.setText(R.string.to_textbox);}
if (viewid == R.id.entry_via) {this.setText(R.string.via_textbox);}
}
}
}
}

适配器:

public class AutocompleteAdapter extends SimpleCursorAdapter {
int source;
public AutocompleteAdapter(int query_source, Context context, int layout, Cursor c,
        String[] from, int[] to) {
    super(context, layout, c, from, to);
    source = query_source;
}
public int getSource() {
    return source;
}
    }
抱歉,这是很多代码!谢谢你的帮助。

斯蒂芬

1 个答案:

答案 0 :(得分:1)

不是使用this作为侦听器,而是创建一个新的侦听器类并为其提供自动完成的textview:

public class MyActivity extends Activity {

   // .... somewhere
   from_auto_complete.setOnItemClickListener(new MyClickListener(from_auto_complete));

   private class MyClickListener implements OnClickListener {
       AutoCompleteTextView autoComplete;
       MyClickListener(AutoCompleteTextView actv) {
           autoComplete = actv;
       }
       // ... handle clicks
   }
}