Blinking Text in android view

Question

How do I display Blinking Text in android.

Thank you all.

Answer 1

Actually there is an Easter egg blink tag for this in ICS! :) I don't actually recommend using it - was REALLY amused to find it in the source, though!

<blink xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">
    <TextView 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="I'm blinking"
        />
</blink>

Answer 2

Create a view animation for it. You can do an alpha fade from 100% to 0% in 0 seconds and back again on a cycle. That way, Android handles it inteligently and you don't have to mess arround with threading and waste CPU.

More on animations here:
http://developer.android.com/reference/android/view/animation/package-summary.html

Tutorial:
http://developerlife.com/tutorials/?p=343

Answer 3

Using Threads in your code always wastes CPU time and decreases performance of the application. You should not use threads all the time. Use if wherever neccessary.

Use XML Animations for this purpose :

R.anim.blink

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <alpha android:fromAlpha="0.0"
        android:toAlpha="1.0"
        android:interpolator="@android:anim/accelerate_interpolator"
        android:duration="600"
        android:repeatMode="reverse"
        android:repeatCount="infinite"/>
</set>

Blink Activity: use it like this :-

public class BlinkActivity extends Activity implements AnimationListener {

    TextView txtMessage;
    Button btnStart;

    // Animation
    Animation animBlink;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_blink);

        txtMessage = (TextView) findViewById(R.id.txtMessage);
        btnStart = (Button) findViewById(R.id.btnStart);

        // load the animation
        animBlink = AnimationUtils.loadAnimation(getApplicationContext(),
                R.anim.blink);

        // set animation listener
        animBlink.setAnimationListener(this);

        // button click event
        btnStart.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                txtMessage.setVisibility(View.VISIBLE);

                // start the animation
                txtMessage.startAnimation(animBlink);
            }
        });

    }

    @Override
    public void onAnimationEnd(Animation animation) {
        // Take any action after completing the animation

        // check for blink animation
        if (animation == animBlink) {
        }

    }

    @Override
    public void onAnimationRepeat(Animation animation) {

    }

    @Override
    public void onAnimationStart(Animation animation) {

    }

}

Let me know if you have any queries..

Answer 4

It can be done by adding a ViewFlipper that alternates two TextViews and Fadein and Fadeout animation can be applied when they switch.

Layout File:

<ViewFlipper android:id="@+id/flipper" android:layout_width="fill_parent" android:layout_height="wrap_content" android:flipInterval="1000" >

<TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:gravity="center_horizontal" android:text="TEXT THAT WILL BLINK"/>

<TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:gravity="center_horizontal" android:text="" />

</ViewFlipper>

Activity Code:

private ViewFlipper mFlipper;
mFlipper = ((ViewFlipper)findViewById(R.id.flipper));
mFlipper.startFlipping();
mFlipper.setInAnimation(AnimationUtils.loadAnimation(getApplicationContext(), android.R.anim.fade_in));
mFlipper.setOutAnimation(AnimationUtils.loadAnimation(getApplicationContext(), android.R.anim.fade_out));

Answer 5

 public static void blinkText(TextView textView) {
    Animation animation = new AlphaAnimation(1, 0);         // Change alpha from fully visible to invisible
    animation.setDuration(300);                             // duration - half a second
    animation.setInterpolator(new LinearInterpolator());    // do not alter animation rate
    animation.setRepeatCount(-1);                            // Repeat animation infinitely
    animation.setRepeatMode(Animation.REVERSE);             // Reverse animation at the end so the button will fade back in
    textView.startAnimation(animation);
}

I can't remember where I found this but it is by far the best I've seen

Answer 6

If you want to make text blink on canvas in bitmap image so you can use this code
we have to create two methods 
So first, let's declare a blink duration and a holder for our last update time: 
private static final  int BLINK_DURATION = 350; // 350 ms
private long lastUpdateTime = 0; private long blinkStart=0;

now create method

    public void render(Canvas canvas) {
    Paint paint = new Paint();
    paint.setTextSize(40);
    paint.setColor(Color.RED);
    canvas.drawBitmap(back, width / 2 - back.getWidth() / 2, height / 2
            - back.getHeight() / 2, null);
    if (blink)
        canvas.drawText(blinkText, width / 2, height / 2, paint);
}

Now create update method to blink

public void update() {
if (System.currentTimeMillis() - lastUpdateTime >= BLINK_DURATION
        && !blink) {
    blink = true;
    blinkStart = System.currentTimeMillis();
}
if (System.currentTimeMillis() - blinkStart >= 150 && blink) {
    blink = false;
    lastUpdateTime = System.currentTimeMillis();
 }

}

Now it work fine

Answer 7

    private bool _blink; 
    private string _initialtext;
    private async void Blink()
    {
        _initialtext = _txtView.Text;
        _txtView.Text = Resources.GetString(Resource.String.Speak_now);
        while (VoiceRecognizerActive)
        {
            await Task.Delay(200);
            _blink = !_blink;
            Activity.RunOnUiThread(() =>
            {
                if (_blink) 
                    _txtView.Visibility = ViewStates.Invisible; 
                else 
                    _txtView.Visibility = ViewStates.Visible; 
            }); 
        }
        _txtView.Text = _initialtext;
        _txtView.Visibility = ViewStates.Visible;
    }

//this is for Xamarin android