Issue with OnTouchListener

You need an action_cancel or an action_up event. To quote the developer site

A pointer id remains valid until the pointer eventually goes up (indicated by ACTION_UP or ACTION_POINTER_UP) or when the gesture is canceled (indicated by ACTION_CANCEL).

http://developer.android.com/reference/android/view/MotionEvent.html

Change the if (event.getAction) to a switch

switch (event.getAction())       
{
    case MotionEvent.ACTION_DOWN:
    
    break;
                
    case MotionEvent.ACTION_UP:  
    
    break;
}

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Do I have to have an action Down?

Is this the correct Syntax for 3 textViews?

public OnTouchListener answerListener = new OnTouchListener() {      
          String s1 = String.valueOf(sum);
            public boolean onTouch(View v, MotionEvent event) {                  
switch (event.getAction())      
{
    case MotionEvent.ACTION_DOWN:
                    if (answer2TextView.equals(s1))
                          ((TextView)v).setVisibility(TextView.INVISIBLE);
else if (answer1TextView.equals(s1))
                          ((TextView)v).setVisibility(TextView.INVISIBLE);
                    return true;
if (answer3TextView.equals(s1))
                          ((TextView)v).setVisibility(TextView.INVISIBLE);
   
    break;

The action_down is to report the movement of the user to the listener class.
An if statment without braces only acts on the following line, so your first if() will always return true.
Also it appears that you will set the View v to invisible regardless of which one is selected, like this.

public boolean onTouch(View v, MotionEvent event) 
{                 
    switch (event.getAction())       
    {
        case MotionEvent.ACTION_DOWN:
         
             if (answer2TextView.equals(s1)
                || answer1TextView.equals(s1)
                || answer3TextView.equals(s1))
             {
                   ((TextView)v).setVisibility(TextView.INVISIBLE);
             }   
         break;
    }
}

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 I think you may have to rewrite your class.

Rewrite my class like the example you posted?

I essentially did this and it is not making the text view invisible on click.

import java.util.Random;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.TextView;

public class MainActivity extends ActionBarActivity {

	private TextView equasionTextView;
	private TextView answer1TextView;
	private TextView answer2TextView;
	private TextView answer3TextView;
	private TextView selectAnswerTextView;
	private RadioButton addRadio;
	private RadioButton subRadio;
	private RadioGroup radioGroup;
	private Button exitButton;
	
	int sum; // sum

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		radioGroup = (RadioGroup) findViewById(R.id.addSubRadioGroup);
		addRadio = (RadioButton) findViewById(R.id.addRadio);
		subRadio = (RadioButton) findViewById(R.id.subRadio);
		equasionTextView = (TextView) findViewById(R.id.equasionTextView);
		selectAnswerTextView = (TextView) findViewById(R.id.selectAnswerTextView);
		exitButton = (Button) findViewById(R.id.exitB);
		radioGroup.setOnCheckedChangeListener(radioListener);
		
		sum = 0;
		
		// Initialize answer textviews to ""
		answer1TextView = (TextView) findViewById(R.id.answer1TextView);
		answer2TextView = (TextView) findViewById(R.id.answer2TextView);
		answer3TextView = (TextView) findViewById(R.id.answer3TextView);
		
		answer1TextView.setText("");
		answer2TextView.setText("");
		answer3TextView.setText("");
		selectAnswerTextView.setVisibility(View.INVISIBLE);
		equasionTextView.setVisibility(View.INVISIBLE);
		answer1TextView.setOnTouchListener(answerListener);
		answer2TextView.setOnTouchListener(answerListener);
		answer3TextView.setOnTouchListener(answerListener);
		exitButton.setOnClickListener(exitListener);

	}
	
	// Calculate the addition problem
	private void addProblem()
	{
		Random r = new Random();
		int guess1; // random number for guess 1
		int guess2; // random number for guess 2
		int first = r.nextInt(9) + 1; // 1-9
		int second = r.nextInt(9) + 1; // 1-9
		
		//answer
		sum = first + second;
		
		// generate random numbers for other guesses
		guess1 = r.nextInt(9);
		guess2 = r.nextInt(9);
		
		
		
		String problem = Integer.toString(first) + " + " + Integer.toString(second) + " = ? " ;
		equasionTextView.setText(problem);
		
		String g1 = Integer.toString(guess1);
		String g2 = Integer.toString(sum);
		String g3 = Integer.toString(guess2);
		
		answer1TextView.setText(g1);
		answer2TextView.setText(g2);
		answer3TextView.setText(g3);
		
		// Set equasion & answer text view to visible
		equasionTextView.setVisibility(View.VISIBLE);
		selectAnswerTextView.setVisibility(View.VISIBLE);
		
		
	}
	// Calculate the subtraction problem
	private void subtractProblem()
	{
		Random r = new Random();
		int guess1 = r.nextInt(9) + 1; // random number for guess 1
		int guess2 = r.nextInt(9) + 1; // random number for guess 2
		int first = r.nextInt(9) + 1;
		int second = r.nextInt(9) + 1;
		
		// handle negatives
		if (first < second) {
			int temp = first;
			first = second;
			second = temp;
		}
		
		
		// answer
		sum = first - second;
		
		String problem = Integer.toString(first) + " - " + Integer.toString(second) + " = ? " ;
		equasionTextView.setText(problem);
		
		String g1 = Integer.toString(guess1);
		String g2 = Integer.toString(sum);
		String g3 = Integer.toString(guess2);
		
		answer1TextView.setText(g1);
		answer2TextView.setText(g2);
		answer3TextView.setText(g3);
		
		// Set equasion & answer text view to visible
		equasionTextView.setVisibility(View.VISIBLE);
		selectAnswerTextView.setVisibility(View.VISIBLE);
		
		
		
	}
	public OnCheckedChangeListener radioListener = new OnCheckedChangeListener() {

		@Override

		public void onCheckedChanged(RadioGroup group, int checkedId) {


               if(addRadio.isChecked())
            	{
            	   addProblem();
            	   radioGroup.setVisibility(View.INVISIBLE);
            	}
               else
                {
            	   subtractProblem();
            	   radioGroup.setVisibility(View.INVISIBLE);
                }
		


}
	};
	
	// Listeners for answers
	public OnTouchListener answerListener = new OnTouchListener() {
		String s1 = String.valueOf(sum);

		public boolean onTouch(View v, MotionEvent event) 
		{                 
		    switch (event.getAction())       
		    {
		        case MotionEvent.ACTION_DOWN:
		         
		             if (answer2TextView.equals(s1)
		                || answer1TextView.equals(s1)
		                || answer3TextView.equals(s1))
		             {
		                   ((TextView)v).setVisibility(TextView.INVISIBLE);
		             }   
		         break;
		    }
			return true;
		}
	};

	// Listener for exit button
	public OnClickListener exitListener = new OnClickListener() {
		@Override
		public void onClick(View v) {
			finish();
			System.exit(0);
		}
	};

}

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