我有一個包含文本項目的圖庫。我可以使用UI更改所選項目,或者使用setSelection(位置)以編程方式更改。但是,當我調用此方法時,有時項目背景不會更改爲選定狀態。我注意到,如果setSelection調用的項目已經在屏幕上繪製,那麼它的背景不會更新。圖庫項目背景未隨set更改選擇
這是代碼。歡迎任何幫助。
public class Test3 extends Activity {
private static String[] items = {"0", "1", "2", "3", "4", "5"};
public void onCreate (Bundle savedInstanceState) {
super.onCreate (savedInstanceState);
LinearLayout layout = new LinearLayout (this);
layout.setOrientation (LinearLayout.VERTICAL);
setContentView (layout);
final Gallery gallery = new Gallery (this);
layout.addView (gallery);
gallery.setSpacing (0);
gallery.setAdapter (new Adapter (this));
gallery.setSelection (0);
ListView list = new ListView (this);
layout.addView (list);
list.setAdapter (new ArrayAdapter <String> (this,
android.R.layout.simple_list_item_1, items));
list.setOnItemClickListener (new OnItemClickListener() {
public void onItemClick (AdapterView <?> parent, View view, int position,
long id)
{
gallery.setSelection (position);
}
});
}
private class Adapter extends ArrayAdapter <String> {
public Adapter (Context context) {
super (context, android.R.layout.simple_gallery_item, items);
}
public View getView (int position, View convertView, final ViewGroup parent)
{
TextView view = new TextView (getContext());
view.setText (getItem (position));
view.setBackgroundResource (R.drawable.gallery_background);
view.setGravity (Gravity.CENTER);
view.setLayoutParams (new Gallery.LayoutParams (Test3.this
.getWindowManager().getDefaultDisplay().getWidth()/3,
Gallery.LayoutParams.FILL_PARENT));
return view;
}
}
}
gallery_background.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_selected="true" android:drawable="@drawable/highlight_selected" />
<item android:state_checked="true" android:drawable="@drawable/highlight_selected" />
<item android:state_focused="true" android:drawable="@drawable/highlight_selected" />
<item android:state_pressed="true" android:drawable="@drawable/highlight_pressed" />
<item android:drawable="@drawable/highlight_disabled" />
</selector>
仍然打開一個更清潔的解決方案。 – Patrick