Question

当我打开一个扩展ArrayAdapter的某个类时，当我转到另一个屏幕并点击后退按钮时会发生奇怪的事情。我设置为某些值，膨胀的xml文件的背景应设置为灰色（200,200,200）。但是当我现在点击后退按钮时，一切都是灰色的，当我刚刚通过主屏幕（而不是按下后退按钮......）时显示效果很好......类看起来像这样：

覆盖getView方法的代码：

@Override
public View getView(int position, View v, ViewGroup parent) {
    View mView = v;

    if (mView == null) {

        LayoutInflater vi = (LayoutInflater) getContext().getSystemService(
                Context.LAYOUT_INFLATER_SERVICE);
        mView = vi.inflate(R.layout.levelselector_item, null);

    }

    TextView level = (TextView) mView.findViewById(R.id.tvLevel);
    TextView levelScore = (TextView) mView.findViewById(R.id.tvLevelScore);

    if (mView != null) {

        level.setText(Integer.toString(getItem(position).getLevel()));

        loadDataBase();
        int correctAnswers = myDbHelper.getCorrectAnswers(getItem(position).getLevel());

        int correctAnswersPrev = 0;
        int correctAnswersPrev = myDbHelper.getCorrectAnswersPrev(getItem(position).getLevel());

        String correct = Integer.toString(correctAnswers);

        levelScore.setText(correct + "/60");
        level.setTypeface(font);
        levelScore.setTypeface(font);

        if (correctAnswersPrev < 2 && !correct.equals("") ){
        mView.setBackgroundColor(Color.argb(200, 200, 200, 200));
        }

    }
    return mView;
}

private void loadDataBase() {
    // TODO Auto-generated method stub
    myDbHelper = new DataBaseHelper(C);
    try {
        myDbHelper.createDataBase();
    } catch (IOException ioe) {
        throw new Error("Unable to create database");
    }
    try {
        myDbHelper.openDataBase();
    } catch (SQLException sqle) {
        throw sqle;
    }
}

Grtz！

Answer 1

如果您确定correctAnswersPrev小于2且correct不为空，则需要为适配器的视图回收器创建默认颜色：

if (correctAnswersPrev < 2 && !correct.equals("") ){
    mView.setBackgroundColor(Color.argb(200, 200, 200, 200));
}
else {
    mView.setBackgroundColor(Color.argb(00, 200, 200, 200));
}

当背景颜色不应为灰色时，它会明确地将背景颜色返回到透明。

按下后退按钮后不正常

1 个答案: