Question

尝试获取我已经拥有的Google地图的快照。我有以下代码：

    public class CaptureMapScreen extends AsyncTask<Void, Void, String> {

    @Override
    protected void onPreExecute()
    {
        Log.d("pre","pre-execute");
        dialog = ProgressDialog.show(WalkStarted.this, "Uploading",
                "Please wait...");

    }

    @Override
    protected String doInBackground(Void... params) {
        GoogleMap.SnapshotReadyCallback callback = new GoogleMap.SnapshotReadyCallback() {
            Bitmap bitmap;

            @Override
            public void onSnapshotReady(Bitmap snapshot) {
                // TODO Auto-generated method stub
                bitmap = snapshot;
                try {
                    Log.d("storage", Environment.getExternalStorageDirectory().toString());
                    FileOutputStream out = new FileOutputStream(save_loc);

                    // above "/mnt ..... png" => is a storage path (where image will be stored) + name of image you can customize as per your Requirement

                    bitmap.compress(Bitmap.CompressFormat.PNG, 90, out);
                    UploadImageClass uim = new UploadImageClass();
                    int response = 0;
                    try {
                        response = uim.execute(save_loc).get();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    } catch (ExecutionException e) {
                        e.printStackTrace();
                    }

                    System.out.println("RES : " + response);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        };

        mMap.snapshot(callback);
        return null;
    }
}

在日志中，我看到了

12-19 07:40:46.731  13516-13516/ly.leash.Leashly D/ID﹕ 2131361924
12-19 07:40:46.731  13516-13516/ly.leash.Leashly D/pre﹕ pre-execute
12-19 07:40:46.951  13516-13516/ly.leash.Leashly D/storage﹕ /storage/emulated/0
12-19 07:40:52.231  13516-13932/ly.leash.Leashly I/uploadFile﹕ HTTP Response is : OK: 200
12-19 07:40:52.231  13516-13516/ly.leash.Leashly I/System.out﹕ RES : 200
12-19 07:40:52.231  13516-13516/ly.leash.Leashly I/Choreographer﹕ Skipped 338 frames!  The application may be doing too much work on its main thread.

服务器响应内容来自我的UploadImageClass（另一个AsyncTask）。所以无论出于何种原因，我似乎无法在此活动开始时提出ProgressDialog。它在最后显示并消失。我可以明显地猜到/看到用户界面已被锁定，但我不知道在哪里，因为这是所有背景资料。

偶尔这会按照我的预期运行，并且ProgressDialog会出现，但通常情况下它并没有按预期工作。

编辑：我添加了

    @Override
    protected void onPostExecute(String args)
    {
        Log.d("post","post-execute2");

    }

这也会在显示ProgressDialog之前打印

EDIT2：

启动此事件的我的OnClick仅启动此事件。在上面启动的Asynctask之后没有其他调用正在进行。我想也许谷歌地图Api搞砸了吗？也许onLocationChanged（）调用或其他什么？

Answer 1

你在哪里调用CaptureMapScreen AsyncTask？您可以在执行asyncTask之前显示对话框，而不是在onPreExecute（）方法中。

例如：

  dialog = ProgressDialog.show(WalkStarted.this, "Uploading",
                "Please wait...");
  CaptureMapScreen captureMapScreenTask = new GetBlogPostsTask();
  captureMapScreenTask.execute();

SnapShotReadyCallback和ProgressDialog的问题

1 个答案: