How to convert Lambda into simple Java function expression

Question

I don't want to use java VERSION_1_8 in my module. but in a snippet code from a library it using this code :

    RxPaparazzo.takeImage(this)
            .crop(options)
            .size(size)
            .usingGallery()
            .subscribe(response -> {
                if (response.resultCode() != Activity.RESULT_OK) {
                    response.targetUI().showUserCanceled();
                    return;
                }

                // Log.e("response",response.data());

                response.targetUI().loadImage(response.data());
            });

now how can I change it to simple java function expression ?

Akshay Chordiya · Accepted Answer · 2016-11-27 07:34:48Z

35

You can change it to anonymous class using the following trick in Android Studio

Click on "->" or Get the cursor on "->"
Press Alt + Enter (or Option + Return on Mac)
Select Replace lambda with anonymous class.

Screenshot to explain:

answered Nov 27, 2016 at 7:34

Akshay Chordiya

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Comments

Angel Koh · Accepted Answer · 2016-11-27 07:26:52Z

it should be some thing along the line of the following.

   RxPaparazzo.takeImage(this)
        .crop(options)
        .size(size)
        .usingGallery()
        .subscribe(new _ON_CALLBACK_LISTENER ()
        {
            @Override
            void _ON_CALLBACK (_FIELD_TYPE response){
                if (response.resultCode() != Activity.RESULT_OK) {
                    response.targetUI().showUserCanceled();
                    return;
                }

                // Log.e("response",response.data());

                response.targetUI().loadImage(response.data());
        }});

you need to know the listenerType (_ON_CALLBACK_LISTENER) and also the parameterType (_FIELD_TYPE)

just hover over the codes, and there should be some hints, and Alt-Enter may auto generate the code stubs for you.

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