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POAndroid: Swipe left to right and right to left
 

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    <p>I am new to Android, and I am trying to make a page where I can swipe from left to right and right to left to go to previous and next pages. I spent a lot of time looking up and trying different things. For some reason, when I swipe (no matter which direction), it only shows next picture. It should have shown me previous picture when I swipe right to left. Any help will be highly appreciated! Thanks so much for your time :)</p> <pre><code>public class MyGestureDetector extends SimpleOnGestureListener { private static final int SWIPE_MIN_DISTANCE = 120; private static final int SWIPE_MAX_OFF_PATH = 250; private static final int SWIPE_THRESHOLD_VELOCITY = 200; public boolean isRightToLeft = false; @Override public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { try { if (Math.abs(e1.getY() - e2.getY()) &gt; SWIPE_MAX_OFF_PATH) return false; // right to left swipe // right to left swipe if(e1.getX() - e2.getX() &gt; SWIPE_MIN_DISTANCE &amp;&amp; Math.abs(velocityX) &gt; SWIPE_THRESHOLD_VELOCITY) { isRightToLeft = true; return true; } // left to right swipe else if (e2.getX() - e1.getX() &gt; SWIPE_MIN_DISTANCE &amp;&amp; Math.abs(velocityX) &gt; SWIPE_THRESHOLD_VELOCITY) { isRightToLeft = false; return true; } } catch (Exception e) { // nothing } return false; } } public class Pictures extends Activity { private int pictureCounter = 1; private Context myContext = this; private GestureDetector gestureDetector; View.OnTouchListener gestureListener; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.pictures); getPicture(pictureCounter); final MyGestureDetector myGestureDetector = new MyGestureDetector(); // Gesture detection gestureDetector = new GestureDetector(myGestureDetector); gestureListener = new View.OnTouchListener() { public boolean onTouch(View v, MotionEvent event) { if (gestureDetector.onTouchEvent(event)) { if (myGestureDetector.isRightToLeft) { previousPicture(); } else if (!myGestureDetector.isRightToLeft) { nextPicture(); } return true; } return false; } }; //iv.setOnTouchListener(gestureListener); ((ImageView)findViewById(R.id.title_pictures)).setOnTouchListener(gestureListener); ImageView iv = (ImageView) findViewById(R.id.flag_pic); iv.setOnClickListener(new OnClickListener() { public void onClick(View arg0) { // TODO Auto-generated method stub nextPicture(); } }); } public void getPicture(int picCounter) { DatabaseHelper myDbHelper = new DatabaseHelper(this); try { myDbHelper.createDatabase(); } catch (IOException ioe) { throw new Error("Unable to create databse"); } try { myDbHelper.openDatabase(); } catch(SQLException sqle) { throw sqle; } String query = "select Before_Picture, After_Picture from picture_mapping where _id = " + picCounter; SQLiteDatabase db = myDbHelper.getReadableDatabase(); Cursor cursor = db.rawQuery(query, null); cursor.moveToFirst(); String beforePicture = cursor.getString(0); String afterPicture = cursor.getString(1); cursor.close(); db.close(); ImageView before_pic = (ImageView) findViewById(R.id.imgView_before_pic); int resId = myContext.getResources().getIdentifier(beforePicture,"drawable", "com.ash.android.pictures"); before_pic.setBackgroundResource(resId); TextView after_pic = (TextView) findViewById(R.id.txtView_after_picture); after_pic.setText(afterPicture); //Toast toast=Toast.makeText(this, beforePicture+ ":" + afterPicture, Toast.LENGTH_LONG); //toast.show(); } public void nextPicture() { if (pictureCounter &lt; 36) { pictureCounter += 1; getPicture(pictureCounter); } else { //do nothing } } public void previousPicture() { if (pictureCounter &gt; 1) { pictureCounter -= 1; getPicture(pictureCounter); } else { //do nothing } } } </code></pre> <p>Thanks in advance!! </p>
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