android - 避免在显示 ProgressDialog 时锁定屏幕

Question

我想在后台执行某些指令时显示进度条，但我不想锁定屏幕。此代码正在锁定屏幕:

private class ConvertDataInBackground extends AsyncTask<Params, Void, Boolean> {

        private MyProgressDialog mProgressDialog;

        @Override
        public void onPreExecute() {
            if(mProgressDialog == null)
                mProgressDialog = MyProgressDialog.show(mActivity, null, null);
        }

        @Override
        protected Boolean doInBackground(Params...params) {
            boolean conversionResult = executeConversion(params[0].item1, params[0].item2, params[0].item3);
            return conversionResult;
        }

        @Override
        protected void onPostExecute(Boolean result) {
            try {
                if(mProgressDialog.isShowing()) 
                    mProgressDialog.dismiss();
                if(result) {
                    Toast toast = Toast.makeText(mActivity, R.string.conversion_result, Toast.LENGTH_SHORT);
                    toast.setGravity(Gravity.CENTER, 0, 0);
                    toast.show();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
}

在后台执行指令可能需要一段时间，我希望用户能够使用该界面。你知道我们可以在界面上工作，而 progressDialog 显示在顶部吗？

Answer 1

Android 中的对话框通常是模态的。您可以尝试创建对话框，然后将 FLAG_NOT_TOUCH_MODAL 添加到其窗口参数中 - 但我不确定它是否有效。它背后的想法是这样的:

ProgressDialog dialog = new ProgressDialog(this);
dialog.setMessage(...);
dialog.setTitle(...);
dialog.getWindow().addFlags(WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL);

同时请注意，将 ProgressBar 添加到 Activity 的布局并在需要时显示它可能更容易，而不是创建对话框 - 事实上，这正是 Google 文档所推荐的. Android developer's guide on dialogs有这样的话:

Avoid ProgressDialog

Android includes another dialog class called ProgressDialog that shows a dialog with a progress bar. However, if you need to indicate loading or indeterminate progress, you should instead follow the design guidelines for Progress & Activity and use a ProgressBar in your layout.