How to make the textview blinking

Question

Guys i have a textview which i need it to be blinking please help me with it.

Answer 1

Just use the <blink/> tag.

<blink
     android:layout_width="wrap_content"
     android:layout_height="wrap_content">

  <TextView 
       android:id="@+id/usage"
       android:layout_marginTop="220dip"
       android:layout_marginLeft="45dip"
       android:layout_marginRight="15dip"
       android:typeface="serif"            
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:text="Google "
       android:textColor="#030900"/>

</blink>

Answer 2

You can make an animation or maybe why not making it View.VISIBLE and View.INVISIBLE with a timer? I think the better way is the animation with alpha indeed :)

Answer 3

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(this,
                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

Here is my helper implementation using an alpha animation:

    public void blinkText(final TextView text_to_animate, int durationMillis) {

        final AlphaAnimation fade_out = new AlphaAnimation(1.0f, 0.0f);
        //ScaleAnimation scale_it = new ScaleAnimation(1.0f, 1.25f, 1.0f, 1.25f);
        fade_out.setDuration(durationMillis);

        final AlphaAnimation fade_in = new AlphaAnimation(0.0f, 1.0f);
        //ScaleAnimation scale_it = new ScaleAnimation(1.0f, 1.25f, 1.0f, 1.25f);
        fade_in.setDuration(durationMillis);

        fade_out.setAnimationListener(new AnimationListener() {
            public void onAnimationEnd(Animation arg0) {
                // TODO Auto-generated method stub
            if (recording == true)
                text_to_animate.startAnimation(fade_in);
            }
            public void onAnimationRepeat(Animation arg0) {
                // TODO Auto-generated method stub              
            }

            public void onAnimationStart(Animation arg0) {
                // TODO Auto-generated method stub              
            }

        });

        fade_in.setAnimationListener(new AnimationListener() {
            public void onAnimationEnd(Animation arg0) {
                // TODO Auto-generated method stub
                if (recording == true)
                    text_to_animate.startAnimation(fade_out);
            }
            public void onAnimationRepeat(Animation arg0) {
                // TODO Auto-generated method stub              
            }

            public void onAnimationStart(Animation arg0) {
                // TODO Auto-generated method stub              
            }

        });

        text_to_animate.startAnimation(fade_out);       

    }

Answer 5

Don't need set for this. Just alpha:

anim/flash_leave_now.xml

    <?xml version="1.0" encoding="utf-8"?>
    <alpha xmlns:android="http://schemas.android.com/apk/res/android"
       android:duration="900"
       android:fromAlpha="1.0"
       android:repeatCount="infinite"
       android:repeatMode="reverse"
       android:toAlpha="0.2"/>

And in code:

mTextView.setAnimation(AnimationUtils.loadAnimation(getContext(), R.anim.flash_leave_now));