Android blinking background edittext?

Question

I would like to have an edittext with a blinking background, e.g. for a quiz, someone write an answer in an edittext and after pushing a button the background should blinking red or green depending on the answer.

Do you have any idea? Thanks:)

Answer 1

Is like that what you need?

public class MainActivity extends Activity {

    int correctAnswer = 12;

    EditText answerET;
    Button answerBtn;

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        answerET = (EditText) findViewById(R.id.editText1);
        answerBtn = (Button) findViewById(R.id.button1);

        //Question for example is 2x6=?
        answerBtn.setOnClickListener(new OnClickListener() {
            public void onClick(View arg0) {
                int answer = Integer.parseInt((answerET.getText().toString()));

                if(answer == correctAnswer){
                    answerET.setBackgroundColor(Color.GREEN);
                    answerET.setAnimation(startBlicking());

                }else{
                    answerET.setBackgroundColor(Color.RED);
                    answerET.setAnimation(startBlicking());
                }
            }

            //blinking animation :)
            private Animation startBlicking(){
                Animation fadeIn = new AlphaAnimation(1, 0);
                fadeIn.setInterpolator(new DecelerateInterpolator()); //add this
                fadeIn.setDuration(1000);
                fadeIn.setRepeatCount(-1);

                return fadeIn;
            }
        });
    }
}

---

This how it looks like:

---

When o answer the wrong answer:

---

For the right one:

---

it's just working as you need i guess, sorry i can't give a test for that it needs video not a picture :)

Good Luck, let me know if something goes wrong

Answer 2

There may well be a cleaner solution but you can use something similar to.

private class BlinkTask extends AsyncTask<Integer, Boolean, Boolean> {
 protected Long doInBackground(Integer... timeout) {
     boolean active = true;
     int counter = 10;
     // If timeout 1s this will flash for 10s
     while(counter-- != 0)
     {
         try {
             Thread.Sleep(timeout[0])
             publishProgress(active);
             active =! active;
         } catch(...){}
     }
     return true;
 }

 protected void onProgressUpdate(Boolean... active) {
     if(active)
         // Change it to one colour here depending on correct answer
         mAnswerText.setBackgroundColor(mCorrectAnswer ? Color.GREEN : Color.RED)
     else
         // Change it to standard colour
 }

 protected void onPostExecute(Boolean result) {

 }
 }

Start it in your `onClick' method with.

new BlinkTask.execute(1);

Answer 3

Give it a try with a simple handler.

//How many times does it blink
private final static int NUM= 10;
//Milliseconds interval
private final static long INTERVAL= 100; 

Initialize your Handlerand Runnable.

Handler handler = new Handler();

Runnable r = new Runnable(){
    int aux = 0;
    public void run(){
        mEditTextView.setBackgroundColor(mCorrectAnswer ? Color.GREEN : Color.RED);
        if(aux < NUM)
            handler.postDelayed(this, INTERVAL);    
        else
            aux = 0; 
    }
};

By the time you want to trigger it just do:

handler.post(r);