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Code Issues Releases Wiki Activity

Add gesture recognition

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This commit is contained in:
DjBushido 2014-03-25 17:23:57 -04:00
parent c0723859c7
commit f1ee03a115
1 changed files with 46 additions and 0 deletions
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46
HW4/src/com/example/hw4/ImageViewerActivity.java
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@ -15,7 +15,11 @@ import android.app.Activity;
import android.app.ProgressDialog;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.Log;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.GestureDetector;
import android.view.Menu;
import android.view.MotionEvent;
import android.view.View;
import android.widget.ImageView;
@ -37,6 +41,23 @@ public class ImageViewerActivity extends Activity {
urls = getResources().getStringArray(urlsId);
currentIndex = extras.getInt("index");
// Code modified from below, updated to use non-deprecated parts of API
// http://stackoverflow.com/questions/4098198/adding-fling-gesture-to-an-image-view-android
final GestureDetector gdt = new GestureDetector(this, new ImageGestures());
findViewById(R.id.imgViewer).setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View arg0, MotionEvent arg1) {
// To be honest, reading documentation at:
// http://developer.android.com/reference/android/view/GestureDetector.OnGestureListener.html
// http://developer.android.com/reference/android/view/View.OnTouchListener.html
// would lead me to think that we should just return gdt.onTouchEvent(arg1).
// However, as someone pointed out on StackOverflow above, they need to be inverted. Going
// to ask professor about that tonight.
return !gdt.onTouchEvent(arg1);
}
});
displayImage(currentIndex);
}
@ -80,6 +101,7 @@ public class ImageViewerActivity extends Activity {
new ImageDownloader().execute(urls[indexToDisplay]);
dialog = new ProgressDialog(this);
dialog.setCancelable(false);
dialog.setMessage("Loading...");
dialog.show();
}
@ -106,5 +128,29 @@ public class ImageViewerActivity extends Activity {
view.setImageBitmap(result);
}
}
// Gesture detection from:
// https://developer.android.com/training/gestures/detector.html
// http://stackoverflow.com/questions/4098198/adding-fling-gesture-to-an-image-view-android
// Please note: Gesture recognition code borrowed heavily from StackOverflow. Because there's so
// little actual code, not sure there's any way to re-do this code that won't look like plagiarism.
private static final int SWIPE_MIN_DISTANCE = 120;
private static final int SWIPE_THRESHOLD_VELOCITY = 200;
private class ImageGestures extends SimpleOnGestureListener {
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
if(e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
displayPrev();
return true;
} else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
displayNext();
return true;
}
return false;
}
}
}