如何在具有图像和文本的自定义材料旋转器中只获取文本
如何在具有图像和文本的自定义材料旋转器中只获取文本
提问于 2017-06-07 10:59:07
我有一个材料旋转器，它显示一个图像和文本，但我只想检索OnItemSelected中的文本。但它正在返回null。
我的适配器类
public class SpinnerCustomAdapter extends BaseAdapter {
Context context;
int cat_pics[];
ArrayList<String> categoryNames;
LayoutInflater inflter;
public SpinnerCustomAdapter(Context applicationContext, int[] cat_pics, ArrayList<String> categoryNames) {
this.context = applicationContext;
this.cat_pics = cat_pics;
this.categoryNames = categoryNames;
inflter = (LayoutInflater.from(applicationContext));
}
@Override
public int getCount() {
return cat_pics.length;
}
@Override
public Object getItem(int i) {
return null;
}
@Override
public long getItemId(int i) {
return 0;
}
@Override
public View getView(int i, View view, ViewGroup viewGroup) {
view = inflter.inflate(R.layout.custom_spinner_items, null);
ImageView icon = (ImageView) view.findViewById(R.id.imageView);
TextView names = (TextView) view.findViewById(R.id.textView);
icon.setImageResource(cat_pics[i]);
names.setText(categoryNames.get(i));
return view;
}
}在主活动中设置适配器
customAdapter=newSpinnerCustomAdapter(getApplicationContext(),cat_pics,allCatNames);
spCategories.setAdapter(customAdapter);
spCategories.setOnItemSelectedListener(this);onItemSelected
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
Toast.makeText(parent.getContext(), "Selected Item : " + customAdapter.getItem(position) ,
Toast.LENGTH_LONG).show();
}回答 3
Stack Overflow用户
回答已采纳
发布于 2017-06-07 11:19:08
在SpinnerCustomAdapter中，getItem()方法返回null
@Override
public Object getItem(int i) {
return null;
}getItem() 方法，如下所示：
@Override
public Object getItem(int i) {
return categoryNames.get(i);
}#.您也可以使用parent.getItemAtPosition(position)获得选定的item。
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
Toast.makeText(getApplicationContext(), "Selected Item : "
+ parent.getItemAtPosition(position).toString(), Toast.LENGTH_LONG).show();
}Stack Overflow用户
发布于 2017-06-07 11:09:22
尝试以下几点：
spinner.getSelectedItem().toString()(或)在OnItemSelectedListener内部：
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
Log.d("SeletedItem",adapterView.getSelectedItem().toString());
}
@Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
});Stack Overflow用户
发布于 2017-06-07 11:39:03
就像这样，也许能帮到你
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
String text = spinner.getItemAtPosition(i)
Toast.makeText(getApplicationContext(), "Selected : " text, Toast.LENGTH_SHORT).show();
}
@Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
});页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/44410771
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