我希望在gridview上实现无线组,这样在grid元素中只能选择单个项。
请帮忙。
最佳答案
限制从网格中选择元素的目的可以实现如下:
1.创建网格元素。
<LinearLayout
android:id="@+id/item_layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:gravity="center">
<ImageView
android:id="@+id/imageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/ic_launcher" />
<RadioButton
android:id="@+id/radiobtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Image" />
</LinearLayout>
2.在自定义适配器的getView()方法中展开此XML。
public class MyAdapter extends BaseAdapter {
Context mCtx;
int[] mImg;
LayoutInflater layoutInflater;
RadioGroup rgp;
private RadioButton mSelectedRB;
private int mSelectedPosition = -1;
public MyAdapter(Context context, int[] img) {
this.mCtx = context;
this.mImg = img;
rgp = new RadioGroup(context);
layoutInflater = (LayoutInflater) mCtx
.getSystemService(LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
return mImg.length;
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(final int position, View convertView,
ViewGroup parent) {
View view = convertView;
Holder holder;
if (view == null) {
view = layoutInflater.inflate(R.layout.element, null);
holder = new Holder();
holder.image = (ImageView) view.findViewById(R.id.imageView);
holder.radioButton = (RadioButton) view
.findViewById(R.id.radiobtn);
view.setTag(holder);
} else {
holder = (Holder) view.getTag();
}
holder.radioButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if ((position != mSelectedPosition && mSelectedRB != null)) {
mSelectedRB.setChecked(false);
}
mSelectedPosition = position;
mSelectedRB = (RadioButton) v;
}
});
if (mSelectedPosition != position) {
holder.radioButton.setChecked(false);
} else {
holder.radioButton.setChecked(true);
if (mSelectedRB != null && holder.radioButton != mSelectedRB) {
mSelectedRB = holder.radioButton;
}
}
return view;
}
}
private class Holder {
ImageView image;
RadioButton radioButton;
}