1、宣告變數

private MyGridView gird_girdview;

private int oldPosition = -1;//上一個位置初始化

2、得到控制元件

gird_girdview = (MyGridView)findViewById(R.id.gird_girdview);

3、定義兩個背景圖片

Resources resources = XiadanActivity.this.getResources();
btnDrawable1 = resources.getDrawable(R.mipmap.stylecheck);
btnDrawable2 = resources.getDrawable(R.mipmap.stylecheckno
 
);

4、新增介面卡

mGirdViewAdapter = new GirdViewAdapter(XiadanActivity.this, infoMapList);

gird_girdview.setAdapter(mGirdViewAdapter);

5、設定第一個item預設點選
gird_girdview.post(new Runnable() {
    @Override
public void run() {
        gird_girdview.getChildAt(0).setBackgroundDrawable(btnDrawable1);
        gird_girdview
 
.setItemChecked(0, true);
        priceId = infoMapList.get(0).get("PriceId");
    }
});

5、點選改變背景
gird_girdview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    @Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        if (oldPosition != -1
 
) {
            parent.getChildAt(oldPosition).setBackgroundDrawable(btnDrawable2);
        }
        gird_girdview.getChildAt(0).setBackgroundDrawable(btnDrawable2);
        gird_girdview.setItemChecked(0, false);
        oldPosition = position;
        view.setBackgroundDrawable(btnDrawable1);
        TextView tv = (TextView) view.findViewById(R.id.tv_PriceId);
        priceId = tv.getText().toString();
    }

});