使用OnclickItemListener

Question

我尝试通过点击按钮来重新加载GridView，以生成并填充新的数字数组到GridView。这是我的代码没有读取新的数组：

gridView = (GridView) findViewById(R.id.gridView);
final ArrayAdapter<Integer> adapter = new ArrayAdapter<Integer>(this,
            android.R.layout.simple_list_item_1,randomArray(arrayNumbers));

gridView.setAdapter(adapter);

gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
            gridView=(GridView)findViewById(R.id.gridView);
            Integer values=Integer.parseInt(gridView.getItemAtPosition(position).toString());
            y.setText(String.valueOf(value));

            if (a==values) {
                Collections.shuffle(randomArray(arrayNumbers));//xao tron vi tri cua cac so trong gridview
                adapter.notifyDataSetChanged();//reload lai gridview
                a = a + r.nextInt(11);//tang gia tri a
                x.setText(String.valueOf(a));
                System.out.println(a);
                //Todo set gia tri a vao mang random(1) vua tao moi
                Toast.makeText(getApplicationContext(), "OK", Toast.LENGTH_SHORT).show();
            } else {
                Toast.makeText(getApplicationContext(), "Failed", Toast.LENGTH_SHORT).show();
            }

       }
})

这是我的Randomnumber方法：

public static ArrayList randomArray(int[] a){
    Random r= new Random();
    List<Integer> list=new ArrayList<>();
    for (int j=1;j<25;){
        int random=((int)(Math.random()*100))+1;
        if (!list.contains(random)){
            list.add (random);
            j++;
        }
    }
    list.add(30);

    return (ArrayList) list;
}

Answer 1

您可以保留对列表的引用：

numbersArrayList = randomArray(arrayNumbers);
final ArrayAdapter<Integer> adapter = new ArrayAdapter<Integer>(this,
        android.R.layout.simple_list_item_1, numbersArrayList);

然后，在不更改引用的情况下，您可以更新OnItemClickListener中的项目：

numbersArrayList.clear();
List<Integer> newList = randomArray(arrayNumbers);
Collections.shuffle(newList);
numbersArrayList.addAll(newList);
adapter.notifyDataSetChanged();