确保在Ui线程中执行更新进度操作，可以使用Handler或AsyncTask的onProgressUpdate方法。例如：

class MyAsyncTask extends AsyncTask{ ProgressDialog progressDialog; @Override protected void onPreExecute() { progressDialog = new ProgressDialog(MainActivity.this); progressDialog.setMax(100); progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); progressDialog.show(); } @Override protected Void doInBackground(Void... voids) { for(int i=0;i<=100;i++){ publishProgress(i); SystemClock.sleep(50); } return null; } @Override protected void onProgressUpdate(Integer... values) { progressDialog.setProgress(values[0]); } @Override protected void onPostExecute(Void aVoid) { progressDialog.dismiss(); } } MyAsyncTask task = new MyAsyncTask(); task.execute();

检查进度对话框是否正确初始化。例如：

ProgressDialog progressDialog = new ProgressDialog(this); progressDialog.setMax(100); progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL); progressDialog.show();

Handler handler = new Handler(); new Thread(() -> { for (int i = 0; i <= 100; i++) { try { Thread.sleep(50); } catch (InterruptedException e) { e.printStackTrace(); } final int progress = i; handler.post(() -> { progressDialog.setProgress(progress); }); } progressDialog.dismiss(); }).start();

检查进度对话框的样式是否正确设置，例如：

ProgressDialog progressDialog = new ProgressDialog(this); progressDialog.setMessage("Loading..."); progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER); progressDialog.show();

new Thread(() -> { try { Thread.sleep(5000); } catch (InterruptedException e) { e.printStackTrace(); } progressDialog.dismiss(); }).start();