如何在 Android 中为 TextInputLayout 设置默认值

Question

I'm using the TextInputLayout from Google's Material Design on Android. I want to set the default text value for the text field.

I know I can set the hint, helper text, and error message, but I want to programatically set the default text value that in other cases would eventually be input by the user.

According to the docs you can technically switch the inner TextInputEditText to a regular EditText but Google does not recommend doing this. Should I explore the risks of doing that or is there a built-in solution I'm missing?

Answer 1

You can use setText method for TextInputEditTest as below where ever you want:

textInputEditText.setText(R.string.yourStringName);//string from resources
textInputEditText.setText("yourString");//static string

If you want to set default text when your activity or fragment initialize You should use setText in onCreate method which is the first callback in activity and fragment life cycle.

And the last thing: you can set default text for TextInputEditText not TextInputLayout because TextInputLayout extends from LinearLayout and therefore it doesn't have text property.

Answer 2

Not really sure what your use case is, but you may think of one of the following:

Case 1: You want the user to see the default text

1. Write your default text in the hint field.
2. When it's time for the app to collect the data, if the View has no text, then use the default text.

Case 2: User doesn't need to see the default text

1. Keep your hint text as you have it now.
2. When it's time for the app to collect the data, if the View has no text, then use the default text.

If either of these cases don't work for you, please clarify the user experience you are seeking. Eg, do you want to wait after a certain event/time to switch the hint with a default text?

Answer 3

<com.google.android.material.textfield.TextInputLayout
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:hint="@string/form_username">