异步任务显示AlertDialog

Question

在过去的几天里,我无法通过对话框解决问题.我正在运行一个线程来显示5000ms的对话框并将其删除.而我正在尝试祝酒("成功").问题是我第二次也得到了对话框.我是Android开发的新手,我需要使用Async Task来解决这个问题,这样我就可以延迟第二个线程,并显示一个带有正面按钮而不是toast的警告dialog.builder.我瞪大了很多,但我很难实现这一点

在这里,我将我的凭据发送到服务器,并在发送时我显示了一个5000ms的进度对话框,我希望有一个单独的线程,以显示带有肯定按钮的dialog.builder.(当用户得到响应时logcat为此我应该从logcat检查响应码== 1是否显示构建器)

如果可能的话,有人帮助我用一些代码片段来解决这个问题.

提前致谢.

这是我需要实现异步任务的代码

Button signin = (Button) findViewById(R.id.regsubmitbtn);
    signin.setOnClickListener(new OnClickListener() {
        public void onClick(View v) {
            // showDialog(0);
            t = new Thread() {
                public void run() {
                    register();
                    try {
                        while (counter < 2) {
                            showmsg(0);
                            Thread.sleep(5000);
                            removeDialog(0);
                            // Toast.makeText(Register.this, "Registerd", Toast.LENGTH_LONG).show();
                            showmsg(1);
                            // toast.show();

                            Thread.sleep(1000);

                        }

                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            };
            t.start();
        }
    });

}

@Override
protected Dialog onCreateDialog(int id) {
    switch (id) {
    case 0: {
        ++counter;
        dialog = new ProgressDialog(this);
        if (counter == 1) {
            dialog.setMessage("Registering...");
        }
        else {
            String resultsRequestSOAP = "";
            if (Log.v("TAG", String.valueOf(resultsRequestSOAP)) == 1)
                ;
            {
                Context context = getApplicationContext();
                CharSequence text = "Registerd";
                int duration = Toast.LENGTH_LONG;

                Toast toast = Toast.makeText(context, text, duration);
                toast.show();
            }
        }
        dialog.setIndeterminate(true);
        dialog.setCancelable(true);
        return dialog;
    }
    }
    return null;
}

public void showmsg(int actionsToBePerformedOnScreen) {
    Message msg = new Message();
    msg.what = actionsToBePerformedOnScreen;
    handler.sendMessage(msg);

}

public Handler handler = new Handler() {
    @Override
    public void handleMessage(Message msg) {
        switch (msg.what) {
        case 0:

            showDialog(0);

            break;

        case 1:
            // clear all images in the list
            removeDialog(0);
            break;

        }

    };
};

Answer 1

简单:显示对话框onPreExecute,注册()doInBackground并隐藏对话框onPostExecute.最后,做new RegisterTask().execute()你的onclick.

 private class RegisterTask extends AsyncTask<Void, Void, Boolean> {
  private final ProgressDialog dialog = new ProgressDialog(YourClass.this);

  protected void onPreExecute() {
     this.dialog.setMessage("Signing in...");
     this.dialog.show();
  }

  protected Boolean doInBackground(final Void unused) {
     return Main.this.register(); //don't interact with the ui!
  }

  protected void onPostExecute(final Boolean result) {
     if (this.dialog.isShowing()) {
        this.dialog.dismiss();
     }
     if (result.booleanValue()) {
     //also show register success dialog
     }
  }
}

Answer 2

为什么不使用Android AsyncTask？例如:

public class MyPreloader extends AsyncTask<InputObject, Void, OutputObject>{
private Context context;
private ProgressDialog dialog;

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

@Override
protected void onPreExecute() {
    dialog = new ProgressDialog(context);
    dialog.setMessage("Please wait...");
    dialog.setIndeterminate(true);
    dialog.show();
    super.onPreExecute();
}   

@Override
protected ResponseBase doInBackground(InputObject... params) {
InputObject input = params[0]; 
//some code for background work
    }

@Override
protected void onPostExecute(OutputObject result) {
    if (dialog.isShowing()) {
        dialog.dismiss();
    }
    super.onPostExecute(result);
}