Question

I want to show a circle progressdialog when some functions run in backstage. so I write such a series of code:

    pd = ProgressDialog.show(GridLayoutActivity.this, "","...");
    new Thread(new Runnable() {
    public void run() {
        someFunc();
        handler.sendEmptyMessage(0);// 执行耗时的方法之后发送消给handler
    }
    }).start();

But the progressDialog doesn’t roll? why?

Answer 1

Try with Asynchronous task, here i post the example code, you may change as per you own

public class BackGround_Task extends AsyncTask<Void, Void, Void> {
        private final ProgressDialog dialog = new ProgressDialog(
                YourClassName.this);

        // can use UI thread here
        protected void onPreExecute() {
            this.dialog.setMessage("Loading...");
            this.dialog.setCancelable(false);
            this.dialog.show();
        }

        @Override
        protected Void doInBackground(Void... params) {
            //Your Background Task

            return null;
        }

        protected void onPostExecute(Void result) {

            //What will you do after the completion of Background process

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