Android：执行计算时出现弹出式警报

Question

I'm moving a pc java code to android by using Android Studio. The java code performs some numeric calculations routines and in a basic computer it can take few seconds to return the problem solution. The java code works very pretty.

By clicking in a button, the routine starts. I'd like to know how to show an elegant "alert" mensagem while the calculations are performed. A kind of "please wait" in a pop-up.

My basic code:

static double h,w,l,t,Te;    
static int ambiente;
private EditText numeroin;
//private TextView numeroout;

public void cliqueBotao(View view){

Intent intent = getIntent();
ambiente = intent.getIntExtra("ambiente_selec", 0);

numeroin=(EditText)findViewById(R.id.in_h);
h= Double.parseDouble(numeroin.getText().toString());

numeroin=(EditText)findViewById(R.id.in_w);
w= Double.parseDouble(numeroin.getText().toString());

numeroin=(EditText)findViewById(R.id.in_l);
l= Double.parseDouble(numeroin.getText().toString());

numeroin=(EditText)findViewById(R.id.in_t);
t= Double.parseDouble(numeroin.getText().toString());

numeroin=(EditText)findViewById(R.id.in_T);
Te= Double.parseDouble(numeroin.getText().toString());

(HERE STARTS THE NUMERICAL CALCULATIONS CODE)

/**AlertDialog msg;
msg=new AlertDialog.Builder(this).create();
msg.setMessage("Calculando");
msg.show();*/

}

By the way, in the button xml code the OnClick option is seted to "cliqueBotao".

Answer 1

You should do that math in a worker thread, take a look at AsyncTask . You can use onProgressUpdate and onPostExecute callbacks to control your pop-up dialog lifecycle and even display current calculation progress.

Answer 2

As suggested by Rogério, AsyncTask was the best solution to my problem. On the other hand, I had to discover how to start a new activity by using AsyncTask. It was not easy for me, but a useful solution is here: Android AsyncTask: start new Activity in onPostExecute()