How To Get Text From Textview Using Espresso

I want get text string shown in a textview in LinearLayout. can espresso do that?　If not, is there other way to do that or can I use android api in espresso test case? I am using

Solution 1:

The basic idea is to use a method with an internal ViewAction that retrieves the text in its perform method. Anonymous classes can only access final fields, so we cannot just let it set a local variable of getText(), but instead an array of String is used to get the string out of the ViewAction.

    String getText(final Matcher<View> matcher) {
        final String[] stringHolder = { null };
        onView(matcher).perform(newViewAction() {
            @Overridepublic Matcher<View> getConstraints() {
                return isAssignableFrom(TextView.class);
            }
    
            @Overridepublic String getDescription() {
                return"getting text from a TextView";
            }
    
            @Overridepublicvoidperform(UiController uiController, View view) {
                TextViewtv= (TextView)view; //Save, because of check in getConstraints()
                stringHolder[0] = tv.getText().toString();
            }
        });
        return stringHolder[0];
    }

Note: This kind of view data retrievers should be used with care. If you are constantly finding yourself writing this kind of methods, there is a good chance, you're doing something wrong from the get go. Also don't ever access the View outside of a ViewAssertion or ViewAction, because only there it is made sure, that interaction is safe, as it is run from UI thread, and before execution it is checked, that no other interactions meddle.

Solution 2:

If you want to check text value with another text, you can create Matcher. You can see my code to create your own method:

publicstatic Matcher<View> checkConversion(finalfloat value){
    returnnewTypeSafeMatcher<View>() {

        @OverrideprotectedbooleanmatchesSafely(View item) {
            if(!(item instanceof TextView)) returnfalse;

            floatconvertedValue= Float.valueOf(((TextView) item).getText().toString());
            floatdelta= Math.abs(convertedValue - value);

            return delta < 0.005f;
        }

        @OverridepublicvoiddescribeTo(Description description) {
            description.appendText("Value expected is wrong");
        }
    };
}