Question

我知道这个问题已经被提出，但是我没有任何适当的解决办法来解决0职位的问题。我正在Gridview上工作，并为此创建了一个适配器（ButtonAdapter）。因此，我有4个按钮，如果我单击其中任何一个按钮，则所选按钮应更改bg颜色，其余三个按钮应均具有降低的不透明度，可以说0.3，但是我的问题是我的第一个按钮不会更改alpha。那么确切的问题是什么？

程序包适配器；

    import android.content.Context;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.BaseAdapter;
    import android.widget.Button;

    import com.appsee.Appsee;
    import com.regiumconsulting.donationssumup.MainActivity;
    import com.regiumconsulting.donationssumup.R;

    import java.math.BigDecimal;
    import java.util.HashMap;
    import java.util.Map;

    public class ButtonAdapter extends BaseAdapter {

        private Context context;
        private final String[] mobileValues;
        private BigDecimal amnt;
        private Button[] chosenone = new Button[1];
        private Button[] tempBtn = null;
        private BigDecimal amount;
        private Map<Button, BigDecimal> buttons = new HashMap<>();

        public ButtonAdapter(Context context, String[] mobileValues) {
            this.context = context;
            this.mobileValues = mobileValues;
            tempBtn = new Button[mobileValues.length];
        }

        public View getView(final int position, View convertView, ViewGroup parent) {

            View gridView = null;

            if (convertView == null) {

                LayoutInflater inflater = (LayoutInflater) context
                        .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

                gridView = new View(context);
                // get layout from item_adaptor.xmlor.xml
                gridView = inflater.inflate(R.layout.item_adaptor, null);

            } else {
                gridView = convertView;
            }

            // set image based on selected text
            final Button btnView = (Button) gridView
                    .findViewById(R.id.grid_item_image);

            setBtnAmnt(position, btnView);

            btnView.setBackgroundResource(R.drawable.button_bg_dashed_border);
            tempBtn[position] = btnView;

            btnView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {

                 for (int i = 0; i < tempBtn.length; i++) {//set alpha to 0.5 for all buttons
                 tempBtn[i].setAlpha(0.3f);//updating only three buttons bg not for 1st one.
                }
                 chosenone[0] = btnView;

                amount = buttons.get(chosenone[0]);

        chosenone[0].setBackgroundResource(R.drawable.button_bg_border);//set alpha 1 to selected one and set selected color
                chosenone[0].setAlpha(1f);

         }     
      }  
    });
     return gridView;
  }

        @Override
        public int getCount() {
            return mobileValues.length;
        }

        @Override
        public Object getItem(int position) {
            return null;
        }

        @Override
        public long getItemId(int position) {
            return 0;
        }

        private void setBtnAmnt(int position, Button imageView) {
            amnt = new BigDecimal(mobileValues[position]);
            imageView.setText(String.format("£ %s", amnt.toString()));
            buttons.put(imageView, amnt);

        }
    }

    Also, I have created on method inside main activity let say screenClick.

    public void screenClick() {
            gridView.setAdapter(adaptor);
            adaptor.notifyDataSetChanged();
        }

So If I call this method and then perform the same operation as mentioned above then only it will work and it will set 0.3 alpha for a 1st button. So what is the issue I don't understand?

I have also attached a screenshot link where a 1st button doesn't have reduced opacity.
https://imgur.com/a/bofGMk4

Android GridView 0位置问题

0 个答案: