TextSwitcher in Android

TextSwitcher

A TextSwitcher is a specialized ViewSwitcher that contains only children of type TextView. A TextSwitcher is useful to animate a label on screen. Whenever setText(CharSequence) is called, TextSwitcher animates the current text out and animates the new text in.

Two types animations are required for  for TextSwitcher to switch between the texts.
1: In Animation: with which  Text come in the Screen.
2: Out Animation: with which Text goes out from the Screen.

As you can see in below image that current Text is going OUT and Next Text is Coming In

What we Need:

We need to set the in and out Animation type of TextSwitcher  like...
         mSwitcher.setInAnimation(in);
         mSwitcher.setOutAnimation(out);
                    
In this Post I have given 3 Example Demos

In Example 1, I have a TextSwitcher and a button called "NEXT" , when user clickes on NEXT button   TextSwitcher will switch between texts . The current Text will go OUT and next Text will come in with specified Animation.


In Example 2, I have a TextSwitcher ,and two Buttons "START"  and "STOP" , when User clicks on START TextSwitcher automatically start  switching between Text, and when User clicks on STOP TextSwitcher will stop switching the Text , I have implemented it using Threads

TextSwitcher Example 1:

In this Example I have following layout

when user clickes on NEXT button   TextSwitcher will switch between texts . The current Text will go OUT and next Text will come in with specified Animation.

example1_layout.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

     <TextSwitcher
            android:layout_marginTop="50dp"
            android:id="@+id/textSwitcher"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal" />
  
      <Button
            android:id="@+id/buttonNext"
            android:layout_marginTop="150dp"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="NEXT"
           />
     
 </LinearLayout>


Text SwitcherExample1Activity.java

public class MainActivity extends Activity
{
            private TextSwitcher mSwitcher;
            Button btnNext;
           
            // Array of String to Show In TextSwitcher
            String textToShow[]={"Main HeadLine","Your Message","New In Technology","New Articles","Business News","What IS New"};
            int messageCount=textToShow.length;
            // to keep current Index of text
            int currentIndex=-1;

           

            @Override
            protected void onCreate(Bundle savedInstanceState)
            {
                        super.onCreate(savedInstanceState);

                      setContentView(R.layout.example1_layout);                       
                       
                        // get The references
                        btnNext=(Button)findViewById(R.id.buttonNext);
                        mSwitcher = (TextSwitcher) findViewById(R.id.textSwitcher);
                       
                        // Set the ViewFactory of the TextSwitcher that will create TextView object when asked
                        mSwitcher.setFactory(new ViewFactory() {
                           
                            public View makeView() {
                                // TODO Auto-generated method stub
                                // create new textView and set the properties like clolr, size etc
                                TextView myText = new TextView(MainActivity.this);
                                myText.setGravity(Gravity.TOP | Gravity.CENTER_HORIZONTAL);
                                myText.setTextSize(36);
                                myText.setTextColor(Color.BLUE);
                                return myText;
                            }
                        });

                        // Declare the in and out animations and initialize them 
                        Animation in = AnimationUtils.loadAnimation(this,android.R.anim.slide_in_left);
                        Animation out = AnimationUtils.loadAnimation(this,android.R.anim.slide_out_right);
                       
                        // set the animation type of textSwitcher
                        mSwitcher.setInAnimation(in);
                        mSwitcher.setOutAnimation(out);
                   
                        // ClickListener for NEXT button
                        // When clicked on Button TextSwitcher will switch between texts
                        // The current Text will go OUT and next text will come in with specified animation
                        btnNext.setOnClickListener(new View.OnClickListener() {
                           
                            public void onClick(View v) {
                                // TODO Auto-generated method stub
                                currentIndex++;
                                // If index reaches maximum reset it
                                if(currentIndex==messageCount)
                                    currentIndex=0;
                                mSwitcher.setText(textToShow[currentIndex]);
                            }
                        });
             
            }
}
       

TextSwitcher Example 2

In this Example  I have following layout

I have a TextSwitcher ,and two Buttons "START"  and "STOP" , when User clicks on START TextSwitcher automatically start  switching between Text, and when User clicks on STOP TextSwitcher will stop switching the Text , I have implemented it using Threads

example2_layout.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

  
      <TextSwitcher
            android:layout_marginTop="50dp"
            android:id="@+id/textSwitcher"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal" />
     
      <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_marginTop="150dp"
            android:orientation="horizontal">
  
              <Button
                    android:id="@+id/buttonStart"
                    android:layout_weight="1"
                    android:layout_width="fill_parent"
                 android:layout_height="wrap_content"
                 android:text="Start"
                 />
     
              <Button
                    android:id="@+id/buttonStop"
                 android:layout_weight="1"
                 android:layout_width="fill_parent"
                 android:layout_height="wrap_content"
                 android:text="Stop"
                   />
           </LinearLayout>

</LinearLayout>

TextSwitcherExample2Activity.java

public class TextSwitcherExample2Activity  extends Activity
{

           private TextSwitcher mSwitcher;
            Button btnStart,btnStop;
   
            // Array of String to Show In TextSwitcher
            String textToShow[]={"Main HeadLine","Your Message","New In Technology","New Articles","Business News","What IS New"};
   
            int messageCount=textToShow.length;
            int currentIndex=-1; // to keep current Index

            // Declare in and out Animations
            Animation in,out;
            Context mContext;
           
            private Handler mHandler = new Handler();
       
             // Create a Runnable Instance
            Runnable r=new Runnable() {
                // Override the run Method
                public void run() {
                    // TODO Auto-generated method stub
                    try
                    {
                        // Update the TextSwitcher text
                        updateTextSwitcherText();
                       
                    }
                    finally
                    {
                        mHandler.postDelayed(this, 1000);
                    }
                }
            };
           
          

            @Override
            protected void onCreate(Bundle savedInstanceState)
            {
                        super.onCreate(savedInstanceState);

                       setContentView(R.layout.example2_layout);               
                        mContext=this;
                        btnStart=(Button)findViewById(R.id.buttonStart);
                        btnStop=(Button)findViewById(R.id.buttonStop); 

                        mSwitcher = (TextSwitcher) findViewById(R.id.textSwitcher);
                       
                        // Set the ViewFactory of the TextSwitcher that will create TextView object when asked
                        mSwitcher.setFactory(new ViewFactory() {
                   
                            public View makeView() {
                                // TODO Auto-generated method stub
                                TextView myText = new TextView(getApplicationContext());
                                myText.setGravity(Gravity.TOP | Gravity.CENTER_HORIZONTAL);
                                myText.setTextSize(36);
                                myText.setTextColor(Color.BLUE);
                                return myText;
                            }
                        });

                        // initialize the in and out  animations
                        in = AnimationUtils.loadAnimation(this,android.R.anim.slide_in_left);
                        out = AnimationUtils.loadAnimation(this,android.R.anim.slide_out_right);
                        mSwitcher.setInAnimation(in);
                        mSwitcher.setOutAnimation(out);

                        mHandler.postDelayed(r, 1000);
                       
                       
                        // Button Start Click Listener
                        btnStart.setOnClickListener(new View.OnClickListener() {
                   
                            public void onClick(View v) {
                               
                                // Start The Text Switcher Animation  
                                mHandler.postDelayed(r,1000);   
                            }
                        });
               
                        // Button Stop Click Listener
                        btnStop.setOnClickListener(new View.OnClickListener() {
                   
                            public void onClick(View v) {
                                  
                                    // Stop the Text Switcher Animation
                                    mHandler.removeCallbacks(r);
                            }
                        });
               
                 }
           
            // method to Update the TextSwitcher Text
            private void updateTextSwitcherText()
            {
                        currentIndex++;
                        if(currentIndex==messageCount)
                            currentIndex=0;
                        mSwitcher.setText(textToShow[currentIndex]);
            }
}
         
You can see Moving Text in following snapshot

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Understanding Layouts in Android                                                   Using Buttons and EditText in Android
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