How to change the size of an Edittext contained in a Alertdialog?

Question

I have a problem, inside a Alertdialog there is an Edittext, but it always gets very big and very close to the margins, I want to make it smaller and centered in the middle of Alertdialog, I tried to give padding but I was not successful

My code is like this:

 private void Add(){

    AlertDialog.Builder alertDialog = new AlertDialog.Builder(MainActivity.this);

    alertDialog.setTitle("Adicionar Contato");
    alertDialog.setMessage("Email do contato");
    alertDialog.setCancelable(false);

    int textoBranco = Color.WHITE;

    final EditText editText = new EditText(getApplicationContext());
    alertDialog.setView(editText);
    editText.setTextColor(textoBranco);

I want to make this text field smaller

Answer 1

You need to set the gravity to align the text and the TextSize to change the font size:

    EditText editText = new EditText(getApplicationContext());
    editText.setGravity(Gravity.CENTER); // alinhado ao centro
    editText.setTextSize(TypedValue.COMPLEX_UNIT_SP ,8); // 8 sp 
    editText.setTextColor(textoBranco);
    alertDialog.setView(editText);

To use the dp instead of sp, use the constant COMPLEX_UNIT_DIP thus:

    editText.setTextSize(TypedValue.COMPLEX_UNIT_DIP ,8); // 8 dp

Related:

What is the difference between px, dp, Dip and sp?

Editing

To set the padding:

 editText.setPadding(30,30,30,30);
        //           ^  ^  ^  ^
        //           esquerdo  topo  direito  abaixo

To do so in dp you need to make a conversion:

    int dp = 8; // tamanho que você quer
    float escala = getResources().getDisplayMetrics().density; 
    int dpFinal = (int)(dp * escala + 0.5f); 
    editText.setPadding(dpFinal,dpFinal,dpFinal,dpFinal); // insere nos lugares
    //                    ^         ^     ^        ^
    //                    esquerdo  topo  direito  abaixo

Source

Answer 2

Do the following:

LayoutParams params = new LayoutParams(50,30); // Largura, Altura
EditText editText = new EditText(getApplicationContext());
editText.setPadding (10,10,10,10); // esquerda, cima, direita, baixo
editText.setLayoutParams(params);

And if you need to turn some value to the police can use:

int valor = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, <valor>, getResources().getDisplayMetrics());