Question

我正在尝试制作一个随机按钮，它会随机重新排序GridView中的TextView项目（简单字母）。我试图简单地复制元素列表Collections.shuffle()，然后循环遍历GridView中的实际元素并将新特征应用于它们。但是，当我这样做时，在两次或三次按下后，所有的字母和特征都是相同的。

 @Override
    public void onCreate(Bundle savedInstanceState) {

        private static final String[] LETTERSET = generateLetterset.main();
        gridView = (GridView) findViewById(R.id.lettersGrid);
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
                R.layout.letter_text_view_item, LETTERSET);
    gridView.setAdapter(adapter);


 public void Shuffle(View v) {
        gridView = (GridView) findViewById(R.id.lettersGrid);
        List<TextView>letterList = new ArrayList<>();

        for (int i = 0; i < gridView.getChildCount(); i++) {
            TextView letter = (TextView) gridView.getChildAt(i);
            letterList.add(letter);
        }

        Collections.shuffle(letterList);


        for (int i = 0; i < gridView.getChildCount(); i++) {
            TextView currentLetter = (TextView) gridView.getChildAt(i);
            TextView newLetter = letterList.get(i);

            String txt = newLetter.getText().toString();
            boolean selected = newLetter.isClickable();
            int color = newLetter.getCurrentTextColor();

            currentLetter.setText(txt);
            currentLetter.setClickable(selected);
            currentLetter.setTextColor(color);
        }
    }

Answer 1

尝试以下代码。 *在oncreate之外声明适配器对象

    private static final String[] LETTERSET = generateLetterset.main();
    public ArrayAdapter<String> adapter;
    private ArrayList<String> stringList;

    public void onCreate(Bundle savedInstanceState) {
        gridView = (GridView) findViewById(R.id.lettersGrid);

        stringList = new ArrayList<String>(Arrays.asList(LETTERSET ));
        adapter = new ArrayAdapter<String>(this,R.layout.letter_text_view_item, stringList );
        gridView.setAdapter(adapter);
    }

并更新Shuffle功能如下

public void Shuffle(View v) { 
    Collections.shuffle(stringList); 
    adapter.notifyDataSetChanged();
}

如何在GridView中混洗TextView元素？

1 个答案: