How to create a blinking text in Android?

Here I am explaining two methods on how to create a blinking textview in Android.

One with the help of Animation class and other with a Logic.

package com.example.blinktext;

 

import android.app.Activity;

import android.os.Bundle;

import android.os.Handler;

import android.view.Menu;

import android.view.View;

import android.view.animation.AlphaAnimation;

import android.view.animation.Animation;

import android.widget.TextView;

 

public class MainActivity extends Activity {

 

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        blinkText();

        //blinkText2();

    }

     

    private void blinkText(){

        final Handler handler = new Handler();

        new Thread(new Runnable() {

            @Override

            public void run() {

            int timeToBlink = 1000;    //in ms

            try{

                Thread.sleep(timeToBlink);

            }catch (Exception e) {

                 

            }

            handler.post(new Runnable() {

                @Override

                    public void run() {

                    TextView txt = (TextView) findViewById(R.id.tv);

                    if(txt.getVisibility() == View.VISIBLE){

                        txt.setVisibility(View.INVISIBLE);

                    }else{

                        txt.setVisibility(View.VISIBLE);

                    }

                    blinkText();

                }

                });

            }}).start();

   }

     

    public void blinkText2(){

        TextView myText = (TextView) findViewById(R.id.tv );

 

        Animation anim = new AlphaAnimation(0.0f, 1.0f);

        anim.setDuration(50); //You can manage the time of the blink with this parameter

        anim.setStartOffset(20);

        anim.setRepeatMode(Animation.REVERSE);

        anim.setRepeatCount(Animation.INFINITE);

        myText.startAnimation(anim);

    }   

 

    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        getMenuInflater().inflate(R.menu.activity_main, menu);

        return true;

    }    

}

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Rounded Image - Example

1. Create a project RoundImage
2. You must add an image in "drawable-hdpi" folder
3. Edit the activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#000000"
    android:orientation="vertical" >

    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:scaleType="centerCrop"
        android:layout_gravity="center"
        android:src="@drawable/image" />

</LinearLayout>

4. Now create an activity RoundImage.java
package com.example.roundimage;

import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.Shader;
import android.graphics.drawable.Drawable;

public class RoundImage extends Drawable {
    private final Bitmap mBitmap;
    private final Paint mPaint;
    private final RectF mRectF;
    private final int mBitmapWidth;
    private final int mBitmapHeight;

    public RoundImage(Bitmap bitmap) {
        mBitmap = bitmap;
        mRectF = new RectF();
        mPaint = new Paint();
        mPaint.setAntiAlias(true);
        mPaint.setDither(true);
        final BitmapShader shader = new BitmapShader(bitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
        mPaint.setShader(shader);

        mBitmapWidth = mBitmap.getWidth();
        mBitmapHeight = mBitmap.getHeight();
    }

    @Override
    public void draw(Canvas canvas) {
        canvas.drawOval(mRectF, mPaint);
    }

    @Override
    protected void onBoundsChange(Rect bounds) {
        super.onBoundsChange(bounds);

        mRectF.set(bounds);
    }

    @Override
    public void setAlpha(int alpha) {
        if (mPaint.getAlpha() != alpha) {
            mPaint.setAlpha(alpha);
            invalidateSelf();
        }
    }

    @Override
    public void setColorFilter(ColorFilter cf) {
        mPaint.setColorFilter(cf);
    }

    @Override
    public int getOpacity() {
        return PixelFormat.TRANSLUCENT;
    }

    @Override
    public int getIntrinsicWidth() {
        return mBitmapWidth;
    }

    @Override
    public int getIntrinsicHeight() {
        return mBitmapHeight;
    }

    public void setAntiAlias(boolean aa) {
        mPaint.setAntiAlias(aa);
        invalidateSelf();
    }

    @Override
    public void setFilterBitmap(boolean filter) {
        mPaint.setFilterBitmap(filter);
        invalidateSelf();
    }

    @Override
    public void setDither(boolean dither) {
        mPaint.setDither(dither);
        invalidateSelf();
    }

    public Bitmap getBitmap() {
        return mBitmap;
    }
}

5. Now edit the MainActivity.java (the activity where you want to apply round image)
package com.example.roundimage;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.widget.ImageView;

import com.example.roundimage.R;

public class MainActivity extends Activity {

    ImageView imageView1, imageView2;
    RoundImage roundedImage, roundedImage1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        imageView1 = (ImageView) findViewById(R.id.imageView1);
        Bitmap bm = BitmapFactory.decodeResource(getResources(),R.drawable.image);
        roundedImage = new RoundImage(bm);
        imageView1.setImageDrawable(roundedImage);
    }
}

6. The AndroidManifest.xml is

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.roundimage"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="11"
        android:targetSdkVersion="19" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity android:name="com.example.roundimage.MainActivity" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

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