在我的Android应用程序中，我正在使用旋转器，我已经从SQLite数据库加载数据到旋转器中，它工作正常。这是它的代码。
Spinner spinner = (Spinner) this.findViewById(R.id.spinner1);
List<String> list = new ArrayList<String>();
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String> (this,android.R.layout.simple_spinner_item, list);
cursor.moveToFirst();
list.add("All Lists");
if (cursor.getCount() > 0) {
for (int i = 0; i < cursor.getCount(); i++) {
keyList[i] = cursor.getString(cursor.getColumnIndex(AndroidOpenDbHelper.KEYWORD));
list.add(keyList[i]);
cursor.moveToNext();
}
}
Database.close();
cursor.close();
dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(dataAdapter);
现在我想要改变旋转数据的文本颜色和文本大小。我在XML文件上使用了以下XML行作为旋转标记，但它不起作用。
android:textColor="@android:color/white"
android:textSize="11dp"
我如何改变我的转轮的文本颜色和文本大小?
可以通过重写getView方法更改文本颜色，如下所示:
new ArrayAdapter<String>(getContext(), android.R.layout.simple_spinner_dropdown_item, list()){
@Override
public View getView(int position, View convertView, @NonNull ViewGroup parent) {
View view = super.getView(position, convertView, parent);
//change the color to which ever you want
((CheckedTextView) view).setTextColor(Color.RED);
//change the size to which ever you want
((CheckedTextView) view).setTextSize(5);
//for using sp values use setTextSize(TypedValue.COMPLEX_UNIT_SP, 16);
return view;
}
}
为了防止滞后，你不仅需要在onItemSelected监听器中设置文本属性，还需要在Activity的onCreate方法中设置文本属性(但这有点棘手)。
具体来说，你需要在设置适配器后把这个放在onCreate中:
spinner.setSelection(0, true);
View v = spinner.getSelectedView();
((TextView)v).setTextColor(backgroundColor);
然后把这个放到onItemSelected中:
((TextView) view).setTextColor(backgroundColor);
下面是一个完整的例子:
@Override
protected void onCreate(Bundle savedInstanceState)
{
Spinner spinner = (Spinner) findViewById(R.id.spinner);
//Set the choices on the spinner by setting the adapter.
spinner.setAdapter(new SpinnerAdapter(toolbar.getContext(), new String[]{"Overview", "Story", "Specifications", "Poll", "Video"}, accentColor, backgroundColor));
//Set the text color of the Spinner's selected view (not a drop down list view)
spinner.setSelection(0, true);
View v = spinner.getSelectedView();
((TextView)v).setTextColor(backgroundColor);
//Set the listener for when each option is clicked.
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener()
{
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id)
{
//Change the selected item's text color
((TextView) view).setTextColor(backgroundColor);
}
@Override
public void onNothingSelected(AdapterView<?> parent)
{
}
});
}
要了解更多细节，请参见我的问题。
Ashraf的另一个解决方案是确保你考虑到屏幕尺寸。你需要在onCreate中获得旋转器，并在设置适配器后设置监听器:
//set your adapter with default or custom spinner cell, then://
serverSpinner.setOnItemSelectedListener(spinnerSelector);
serverSpinner.setSelection(defaultServer);
然后你可以开始改变在旋转器被点击之前显示的视图的文本大小:
private AdapterView.OnItemSelectedListener spinnerSelector = new AdapterView.OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
boolean tabletSize = getResources().getBoolean(R.bool.isTablet);
boolean largeTablet = getResources().getBoolean(R.bool.isLargeTablet);
if (tabletSize) { ((TextView)parent.getChildAt(0)).setTextSize(16); }
else if (largeTablet) { ((TextView)parent.getChildAt(0)).setTextSize(18); }
else { ((TextView)parent.getChildAt(0)).setTextSize(12); }
}
public void onNothingSelected(AdapterView<?> parent) {
}
};
你所需要做的就是创建如下布局的特定文件夹:
values-sw360dp
values-sw600dp
values-sw800dp
然后在每个文件夹中添加一个名为“bol . XML”的XML文件:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<bool name="isTablet">false</bool>
<bool name="isLargeTablet">false</bool>
</resources>
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/text1"
style="?android:attr/spinnerItemStyle"
android:singleLine="true"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#fff"
android:ellipsize="marquee"
android:textAlignment="inherit"/>
就用这个吧:
ArrayAdapter<String> adapter_category = new ArrayAdapter<String>(this,
R.layout.spinner_list_item, categories);
adapter_category
.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
