创建自定义下拉框
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Spinner;
public class CustomSpinner extends Spinner {
OnItemSelectedListener listener;
private AdapterView<?> lastParent;
private View lastView;
private long lastId;
public CustomSpinner(Context context, AttributeSet attrs) {
super(context, attrs);
initlistner();
}
@Override
public void setSelection(int position) {
if (position == getSelectedItemPosition() && listener != null) {
listener.onItemSelected(lastParent, lastView, position, lastId);
} else {
super.setSelection(position);
}
}
private void initlistner() {
super.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
lastParent = parent;
lastView = view;
lastId = id;
if (listener != null) {
listener.onItemSelected(parent, view, position, id);
}
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
if (listener != null) {
listener.onNothingSelected(parent);
}
}
});
}
public void setOnItemSelectedEvenIfUnchangedListener(
OnItemSelectedListener listener) {
this.listener = listener;
}
}
Set Listener
private OnItemSelectedListener listener;
listener = new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
}
};
将监听器对象传递给自定义监听器。
cusSpinner.setOnItemSelectedEvenIfUnchangedListener(listener)
spinner.setSelection(Spinner.INVALID_POSITION);
,这样onItemSelected
事件总是会触发一个onNothingSelected
事件。这意味着您将失去跟踪所选项目的功能,但我认为对于这种情况来说并不是很重要。您也可以尝试仅在position == 1
时调用。 - TWiStErRob