java - 进度对话框不起作用

Question

我正在尝试在 java 'A' 中显示一个进度对话框。目前正在从“A”调用来自 java“B”的类，其中某些 java 从 Web 服务下载数据并将数据保存到文件中。它不显示进度对话框。我使用的代码是:

ProgressDlg= ProgressDialog.show(Doctor.this, "","Loading. Please wait...", true);
String time_batch=mDataIntent.getExtras().getString("TIME_BATCH");
String patientid=mDataIntent.getExtras().getString("PatientId")
mGetHeartRate = new GetHeartRate(Doctor.this, mHandler);
mgetEcgAnalized = new getEcgAnalized(Doctor.this, mHandler);
mGetHeartRate.getHeart(patientid,time_batch);                                      
mgetEcgAnalized.getECG(patientid, time_batch, "I".toString());
ProgressDlg.dismiss();

Answer 1

您是否在 AsyncTask 中执行 ProgressDialog？像这样:

public class ExampleTask extends AsyncTask<String, Integer, String> {
    private ProgressDialog progressDlg;
    private Context context;
    private Handler progressHandler;

    public ExampleTask(Context context) {
        this.context = context;
    }

    @Override
    protected void onPreExecute() {
        progressHandler = new Handler();
    }

    @Override
    protected String doInBackground(String... params) {
        //to do
    }

    @Override
    protected void onPostExecute(String filePath) {
        if (progressDlg != null) {
            progressDlg.dismiss();
            progressDlg = null;
        }
    }

    @Override
    protected void onProgressUpdate(final Integer... values) {
        final int progress = values[0] / 1000;
        if (progressDlg == null) {
            progressHandler.post(new Runnable() {
                @Override
                public void run() {
                    final int max = values[1] / 1000;
                    progressDlg = new ProgressDialog(context);
                    progressDlg.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
                    progressDlg.setMessage("Message");
                    progressDlg.setMax(max);
                    progressDlg.show();

                }
            });
        } else {
            progressDlg.setProgress(progress);
        }
    }
}