Android Character by Character Display Text Animation

Android character by character display text animation

This may not be the most elegant solution, but the simplest is probably a quick subclass of TextView with a Handler that updates the text every so often until the complete sequence is displayed:

public class Typewriter extends TextView {

    private CharSequence mText;
    private int mIndex;
    private long mDelay = 500; //Default 500ms delay

    public Typewriter(Context context) {
        super(context);
    }

    public Typewriter(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    private Handler mHandler = new Handler();
    private Runnable characterAdder = new Runnable() {
        @Override
        public void run() {
            setText(mText.subSequence(0, mIndex++));
            if(mIndex <= mText.length()) {
                mHandler.postDelayed(characterAdder, mDelay);
            }
        }
    };

    public void animateText(CharSequence text) {
        mText = text;
        mIndex = 0;

        setText("");
        mHandler.removeCallbacks(characterAdder);
        mHandler.postDelayed(characterAdder, mDelay);
    }

    public void setCharacterDelay(long millis) {
        mDelay = millis;
    }
}

You can then use this in an Activity like so:

public class MyActivity extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Typewriter writer = new Typewriter(this);
        setContentView(writer);

        //Add a character every 150ms
        writer.setCharacterDelay(150);
        writer.animateText("Sample String");
    }
}

If you want some animation effects with each letter added, perhaps look at subclassing TextSwitcher instead.

Hope that Helps!

Trouble with Android character by character display text animation

You are using it in a wrong way. To make your textview like in example do this.

Typewriter contact_popup = (Typewriter) view.findViewById(R.id.contact_popup);
contact_popup.setCharacterDelay(150);
contact_popup.animateText("Sample String");

return view;

Display a String letter by letter in a TextView -Android

This code works,

    public void setText(final String s)
    {
    TextView tv= (TextView)HomeActivity.tf.getView().findViewById(R.id.textViewFragment);
    final int[] i = new int[1];
    i[0] = 0;
    final int length = s.length();
    final Handler handler = new Handler()
    {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            char c= s.charAt(i[0]);
            Log.d("Strange",""+c);
            tv.append(String.valueOf(c));
            i[0]++;
        }
    };

    final Timer timer = new Timer();
    TimerTask taskEverySplitSecond = new TimerTask() {
        @Override
        public void run() {
            handler.sendEmptyMessage(0);
            if (i[0] == length - 1) {
                timer.cancel();
            }
        }
    };
    timer.schedule(taskEverySplitSecond, 1, 500);
}

How to animate TextView with Alpha from Left to Right?

After doing lots of research on the same, I'm posting my own answer.

Steps:

1. Create CustomTextLayout

   class CustomTextLayout @JvmOverloads constructor(
       context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0
   ) : LinearLayoutCompat(context, attrs, defStyleAttr) {
   
       private var characterAnimationTime = 100
       private var textSize = 22f
       private var letterSpacing = 0f
       private var animationDuration = 2000L
   
       init {
           orientation = HORIZONTAL
           val typedArray = context.obtainStyledAttributes(attrs, R.styleable.CustomTextLayout, defStyleAttr, 0)
           textSize = typedArray.getFloat(R.styleable.CustomTextLayout_textSize, textSize)
           typedArray.recycle()
       }
   
       /**
        * This function sets the animated alpha text
        * @param context Context of Activity / Fragment
        * @param text Text string
        * @param initialDelay Start animation delay
        */
       fun setAnimatedText(context: Context, text: String, initialDelay: Long = 0) {
           var textDrawPosition = 0
           Handler().postDelayed({
               for (char in text) {
                   val textView = getTextView(char.toString())
                   textView.visibility = View.GONE
                   this.addView(textView)
                   textDrawPosition++
                   drawAnimatedText(
                       context,
                       this,
                       textView,
                       textDrawPosition,
                       text,
                       (textDrawPosition * characterAnimationTime).toLong()
                   )
               }
           }, initialDelay)
       }
   
       private fun drawAnimatedText(
           context: Context,
           parentView: LinearLayoutCompat,
           textView: AppCompatTextView,
           position: Int,
           text: String,
           initialDelay: Long
       ) {
           val colorAnimation = ValueAnimator.ofObject(ArgbEvaluator(), Color.WHITE, Color.BLACK)
           colorAnimation.startDelay = initialDelay
           colorAnimation.duration = animationDuration
           colorAnimation.addListener(object : Animator.AnimatorListener {
               override fun onAnimationStart(animator: Animator) {
                   textView.visibility = View.VISIBLE
               }
   
               override fun onAnimationEnd(animator: Animator) {
                   if (position == text.length) {
                       val updatedTextView = getTextView(text)
                       updatedTextView.setTextColor(Color.BLACK)
                       updatedTextView.visibility = View.VISIBLE
                       parentView.removeAllViews()
                       parentView.addView(updatedTextView)
                   }
               }
   
               override fun onAnimationCancel(animator: Animator) {
   
               }
   
               override fun onAnimationRepeat(animator: Animator) {
   
               }
           })
           colorAnimation.addUpdateListener {
               textView.setTextColor(it.animatedValue as Int)
           }
           colorAnimation.start()
       }
   
       private fun getTextView(text: String): AppCompatTextView {
           val textView = AppCompatTextView(context)
           textView.text = text
           textView.textSize = textSize
           textView.setTypeface(Typeface.SANS_SERIF, Typeface.ITALIC)
           textView.letterSpacing = letterSpacing
           return textView
       }
   

2. Add in layout file

   <com.mypackagename.CustomTextLayout
                           app:textSize="30"
                           app:letterSpacing="0.1"
                           android:id="@+id/textLayoutFirst"
                           android:layout_width="match_parent"
                           android:layout_height="wrap_content"
                           android:layout_weight="1">
   
   </com.mypackagename.CustomTextLayout>
   

3. Add attrs.xml

   <?xml version="1.0" encoding="utf-8"?>
   <resources>
       <declare-styleable name="CustomTextLayout">
           <attr name="textSize" format="float"/>
           <attr name="letterSpacing" format="float"/>
       </declare-styleable>
   
   </resources>
   

4. Start animation:

   textLayoutFirst.setAnimatedText(this, "Some text here")
   

It's done.

animate text letters

found an easy way by using two TextView controls. First is set to the first latter of a word by mytext.substring(0,1) and second one to mytext.substring(1).

when do startAnimation for both or you can have one animation for the first view and another one for the second one.

on layout file, i put them next to each other on RelativeLayout:

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/MainLayout"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <TextView
        android:id="@+id/txtCaption"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="80dp"
        android:textColor="#FFFFFF"
        android:text="est"
        android:layout_centerHorizontal="true"
        android:layout_alignParentBottom="true"
        />

    <TextView
        android:id="@+id/txtCaptionFirstLetter"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="70dp"
        android:textColor="#00FF00"
        android:textStyle="bold"
        android:text="T" 
        android:layout_toLeftOf="@+id/txtImageCaption" 
        android:layout_alignBottom="@+id/txtImageCaption"
        />
</RelativeLayout>

Changing Text color animation in Android

You can use a TextSwitcher

See these tutorials / examples. They will help you get started:

1. http://www.example8.com/category/view/id/15552
2. http://www.coderzheaven.com/2011/07/02/textswitching-animation-in-android-or-textswitcher-control-in-android/
3. http://www.java2s.com/Code/Android/UI/UsesaTextSwitcher.htm

And finally, I believe an example is also available in the API demos from the Samples For SDK (API 13 I think) package in the SDK Manager

You will naturally have to code for synchronizing the TTS speech and the animation itself.

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