Error on lambda operators in android

Question

i want to write a code using Runnable method using lambda operators but i got an error of Error:(40, 33) error: lambda expressions are not supported in -source 1.7 (use -source 8 or higher to enable lambda expressions) Here is my code:`

public void countDownStart(){
    handler= new Handler();
    runnable= (Runnable) () -> {
       handler.postDelayed((Runnable) this, 1000);
        try{
            SimpleDateFormat dateFormat= new SimpleDateFormat("YYYY-MM-DD");
            Date futureDate= dateFormat.parse("2017-03-31");
            Date currentDate= new Date();
            if (!currentDate.after(futureDate)){
                long diff = futureDate.getTime()- currentDate.getTime();
                long days = diff / (24 * 60 * 60 * 1000);
                diff -= days * (24 * 60 * 60 * 1000);
                long hours = diff / (60 * 60 * 1000);
                diff -= hours * (60 * 60 * 1000);
                long minutes = diff / (60 * 1000);
                diff -= minutes * (60* 1000);
                long seconds = diff / 1000;
             txtTimerDay.setText("" + String.format("%02d", days));
             txtTimerHour.setText("" + String.format("%02d", hours));
             txtTimerMinute.setText("" + String.format("%02d", minutes));
             txtTimerSecond.setText("" + String.format("%02d", seconds));
            }else{
                tvEvent.setVisibility(View.VISIBLE);
                tvEvent.setText("The Event Started");
                textViewGone();
            }
        } catch (Exception e){
            e.printStackTrace();
        }
    };
    handler.postDelayed(runnable, 1 * 1000);
}

What is your JAVA verson?

Chirag Savsani
– Chirag Savsani

2017-03-30 10:49:44 +00:00
Commented Mar 30, 2017 at 10:49 — Chirag Savsani
– Chirag Savsani, Commented Mar 30, 2017 at 10:49
have you searched the error message on google?

Vladyslav Matviienko
– Vladyslav Matviienko

2017-03-30 10:57:02 +00:00
Commented Mar 30, 2017 at 10:57 — Vladyslav Matviienko
– Vladyslav Matviienko, Commented Mar 30, 2017 at 10:57

Rich · Accepted Answer · 2017-03-30 10:57:15Z

1

you are using java 7. lambda expressions are supported since java 8. problem in android is, only android n (7.0) or higher supports java 8. if you still want to use lambdas in lower android versions, you can use libraries like retrolambda, but these libraries often don't support all functionalities of java lambdas.

answered Mar 30, 2017 at 10:57

Rich

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Comments

Neji · Accepted Answer · 2017-03-30 10:52:02Z

0

Have you added following instructions in your build.gradle file?

defaultConfig {

    jackOptions {
      enabled true
    }
  }
  compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
  }

answered Mar 30, 2017 at 10:52

Neji

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