如何启动和Android的动态完成进度 [英] How to start and finish progressBar dynamically in android

问题描述

当我跳过从第一个活动第二类活动课，我将开始imageprocessing某些图像中第二个活动，然后，直到新的图像来筛选我Wnt信号来启动进度条，然后完成时，新的图像来筛选。我怎样才能做到这一点？

When I skip second activity class from first activity class, I will start imageprocessing on certain image in second activity and then until new image comes to screen I wnt to start progress bar and then finish when the new image comes to screen. How can I do this ?

推荐答案

使用ProgreaaDialog和AsyncTask的。你西港岛线让您soultion 使用的AsyncTask在doBackInGroundProcess做图像处理。而在doPostExecute（）退出或取消进度对话框

Use ProgreaaDialog and AsyncTask. you wil get your soultion Use AsyncTask in doBackInGroundProcess do image processing. and in doPostExecute() exit or cancel the progress dialog

对样品code看看。 要启动AsyncTsk使用新ProgressTask（）执行（空）; 从那里你想要做图像处理的活动。

have a look on the sample code. To start AsyncTsk use new ProgressTask().execute(null); from the activity where you want to do image processing.

    private class ProgressTask extends AsyncTask<String, Void, Boolean> {
        private ProgressDialog dialog;
        List<Message> titles;
        private ListActivity activity;
        //private List<Message> messages;
        public ProgressTask(ListActivity activity) {
            this.activity = activity;
            context = activity;
            dialog = new ProgressDialog(context);
        }



        /** progress dialog to show user that the backup is processing. */

        /** application context. */
        private Context context;

        protected void onPreExecute() {
            this.dialog.setMessage("Progress start");
            this.dialog.show();
        }

            @Override
        protected void onPostExecute(final Boolean success) {
                List<Message> titles = new ArrayList<Message>(messages.size());
                for (Message msg : messages){
                    titles.add(msg);
                }
                MessageListAdapter adapter = new MessageListAdapter(activity, titles);
                activity.setListAdapter(adapter);
                adapter.notifyDataSetChanged();

                if (dialog.isShowing()) {
                dialog.dismiss();
            }

            if (success) {
                Toast.makeText(context, "OK", Toast.LENGTH_LONG).show();
            } else {
                Toast.makeText(context, "Error", Toast.LENGTH_LONG).show();
            }
        }

        protected Boolean doInBackground(final String... args) {
            try{    
                BaseFeedParser parser = new BaseFeedParser();
                messages = parser.parse();


                return true;
             } catch (Exception e){
                Log.e("tag", "error", e);
                return false;
             }
          }


    }

}

有一个看看这里

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