How to set a value to the textview using Espresso

问题:

I am writing the test cases for the Fragment. I can able to set a text to the Edittext but am unable to setText to the text view from testing. Please, anyone, help me to resolve this issue.Bellow is my code for edit text.

   onView(withId(R.id.editText))
        .perform(typeText("my text"), closeSoftKeyboard());

Please help me how to set a text to the text view.

回答1:

It's happening due to the precondition of typeText i.e.

View preconditions:

must be displayed on screen

must support input methods

Input method is not supported by TextView(user cannot input values into it via keyboard or something else) so hence the issue

Solution : you can implement your own view ViewAction

From how to create View action to set text on TextView

public static ViewAction setTextInTextView(final String value){
            return new ViewAction() {
                @SuppressWarnings("unchecked")
                @Override
                public Matcher<View> getConstraints() {
                    return allOf(isDisplayed(), isAssignableFrom(TextView.class));
//                                            ^^^^^^^^^^^^^^^^^^^ 
// To check that the found view is TextView or it's subclass like EditText
// so it will work for TextView and it's descendants  
                }

                @Override
                public void perform(UiController uiController, View view) {
                    ((TextView) view).setText(value);
                }

                @Override
                public String getDescription() {
                    return "replace text";
                }
            };
    }

then you can do

onView(withId(R.id.editText))
        .perform(setTextInTextView("my text"));