I have a calendar with gridview and changing months should be working with gestures (flings) on the gridview. A fling from left to right goes to the previous month, and a fling from right to left should go to the next month. The first one works, the second one does not always work, it detects the left to right fling instead(40-50%). I am using a standard onfling function and I have two other buttons with arrows that indicate another option to change months. Those buttons work very well, and if I use the onfling function on an imageview or textview, or anything that isnt a gridview, it works very well.
class MyGestureDetector extends SimpleOnGestureListener
{
private static final int SWIPE_MIN_DISTANCE = 40;
private static final int SWIPE_MAX_OFF_PATH = 250;
private static final int SWIPE_THRESHOLD_VELOCITY = 200;
#Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY)
{
if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
return false;
if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY)
{
//Log.i("Swipe", "Right to Left");
//Log.i("Swipe", "Swipe rowid2" + selected_row_id2 + "set to true");
gestureDirection = "rtl";
Toast toast = Toast.makeText(getApplicationContext(), "RTL", 3500);
toast.show();
return true;
}
else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY)
{
//Log.i("Swipe", "Left to Right");
//Log.i("Swipe", "Swipe rowid" + selected_row_id2 + "set to false");
gestureDirection = "ltr";
Toast toast2 = Toast.makeText(getApplicationContext(), "LTR", 3500);
toast2.show();
return true;
}
return false;
}
}
As I mentioned it is a standard onFLing function, but the fling from right to left sometimes behaves as if I flinged from left to right and instead of changing to the next month it goes back to the previous month. It should impossible since (e1.getX() - e2.getX()) should not allow this. I noticed that if my fling from right to left is short (but of course bigger than the SWIPE_MIN_DISTANCE) it always work, but for example if my fling's size is almost 3/4 screen it sometimes behaves incorrect. Another interesting thing, it always works on emulator, the problem is detected on phone.
Any one had this problem?
Related
I have created 5 activities, each has a ListView containing only images. I have used a simple swipe animation to change activities.
Here is the relevant code:
#Override
public boolean onTouchEvent(MotionEvent event) {
if (gestureDetector.onTouchEvent(event)) {
return true;
}
return super.onTouchEvent(event);
}
private void onLeftSwipe() {
Intent intent = new Intent(HimachalActivity.this, IndianWildlifeActivity.class);
startActivity(intent);
overridePendingTransition(R.anim.slide_left_in, R.anim.slide_left_out);
}
private void onRightSwipe() {
Intent intent = new Intent(HimachalActivity.this, BaseActivity.class);
startActivity(intent);
overridePendingTransition(R.anim.slide_right_in, R.anim.slide_right_out);
}
private class SwipeGestureDetector extends GestureDetector.SimpleOnGestureListener {
// Swipe properties, you can change it to make the swipe
// longer or shorter and speed
private static final int SWIPE_MIN_DISTANCE = 120;
private static final int SWIPE_MAX_OFF_PATH = 200;
private static final int SWIPE_THRESHOLD_VELOCITY = 200;
#Override
public boolean onFling(MotionEvent e1, MotionEvent e2,
float velocityX, float velocityY) {
try {
float diffAbs = Math.abs(e1.getY() - e2.getY());
float diff = e1.getX() - e2.getX();
if (diffAbs > SWIPE_MAX_OFF_PATH)
return false;
// Left swipe
if (diff > SWIPE_MIN_DISTANCE
&& Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
HimachalActivity.this.onLeftSwipe();
// Right swipe
} else if (-diff > SWIPE_MIN_DISTANCE
&& Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
HimachalActivity.this.onRightSwipe();
}
} catch (Exception e) {
Log.e("BaseActivity", "Error on gestures");
}
return false;
}
}
The problem is that the next activity or previous activity opens only after full swipe and the animation does not feel that smooth.
I want an animation in which the next activity or previous activity starts revealing itself as soon as I start swiping. Is there any built-in animation that can be applied. If not, please point me to any relevant resources for creating one myself, possibly, one which does not require me to modify the existing code much. Thanks.
As far as I know this feature is easily available in Lollipop material design module.
I reckon, it would be easier in case you follow #Whitney 's advice. Put your fragments in view pager as described here: http://developer.android.com/training/animation/screen-slide.html
The reason it is not working with your current implementation is that the device makes sense of fling gesture only after you have flinged. Thereafter, the animation takes place. Fling is not detected in real time. In case you want to implement real time fling, you might have to override touch events as described here: http://developer.android.com/training/custom-views/making-interactive.html
How to create an image slider in eclipse?
i want, when a finger moves from left to right or from right to left on imageView, I want to change the photo.
No need to do any custom thing.As Android provides the facility like this in ViewFlipper class.It is actually made for it.
View Flipper:-
Simple ViewAnimator that will animate between two or more views that
have been added to it. Only one child is shown at a time. If
requested, can automatically flip between each child at a regular
interval.
Its very nice and also built in support for animation so just use this for this purpose.
To implement the ViewFlipper in your application I am sharing some good tutorials..
http://javatechig.com/android/android-viewflipper-example
http://www.yogeshblogspot.com/android-viewflipper-example/
http://learnandroideasily.blogspot.in/2013/06/android-viewflipper-example.html
You can also get more info at here.
http://developer.android.com/reference/android/widget/ViewFlipper.html.
Enjoy..!
View Pager refer this is one option, otherwise you can add a simple gesture listener to your image view.
//Adding gesture listener to image view.
final GestureDetector gdt = new GestureDetector(new GestureListener());
final ImageView imageView = (ImageView) findViewById(R.id.image_view);
imageView.setOnTouchListener(new OnTouchListener() {
#Override
public boolean onTouch(final View view, final MotionEvent event) {
gdt.onTouchEvent(event);
return true;
}
});
//The gesture listener class
private class GestureListener 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) {
//load previous image here
return false; // Right to left
} else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
//load next image here
return false; // Left to right
}
if(e1.getY() - e2.getY() > SWIPE_MIN_DISTANCE && Math.abs(velocityY) > SWIPE_THRESHOLD_VELOCITY) {
return false; // Bottom to top
} else if (e2.getY() - e1.getY() > SWIPE_MIN_DISTANCE && Math.abs(velocityY) > SWIPE_THRESHOLD_VELOCITY) {
return false; // Top to bottom
}
return false;
}
}
I want to animate onFling events on my list view.
The animation works fine, but at the wrong row.
For example:
ListView with only one item, the animation work as expected.
ListView with two items: with the gesture is make on the first item the second one is animated and vice-versa.
ListView with three items: with the gesture is make on the first item se last one is animated , on the second item the second item is animated (as expected), on the last item the first item is animated.
CODE:
#Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY) {
int position = listView.pointToPosition(Math.round(e1.getX()),
Math.round(e1.getY()));
View row = listView.getChildAt(position);
TranslateAnimation anim = null;
if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH || row == null)
return true;
if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE
&& Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
anim = new TranslateAnimation(Animation.RELATIVE_TO_SELF,1,Animation.RELATIVE_TO_SELF, 0,
Animation.RELATIVE_TO_SELF,0,Animation.RELATIVE_TO_SELF,0);
this.handleSwipe.onHandleSwipeLeft(position);
} else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE
&& Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
anim = new TranslateAnimation(Animation.RELATIVE_TO_SELF,-1,Animation.RELATIVE_TO_SELF, 0,
Animation.RELATIVE_TO_SELF,0,Animation.RELATIVE_TO_SELF,0);
this.handleSwipe.onHandleSwipeRight(position);
}else{
return true;
}
anim.setDuration(500);
row.startAnimation(anim);
return true;
}
OBS:
Already debug, and the position and row are always right.
I'm using api level 7.
The code work fine on android 4.2
Guilherme, probably the code:
int position = listView.pointToPosition(Math.round(e1.getX()),
Math.round(e1.getY()));
Isn't returning the row id 3. Can you confirm that?
I can make a gesture which detects a movement when the user touches the screen from left to right.
But I don't know how to make the image move along with that movement.
The purpose of this is to do a lock screen inside my application like the iPhone lock/unlock feature.
I guess I have to do something like image_swipe.setAnimate... or something.
If anyone has any idea, please let me know.
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;
#Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY) {
try {
if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
return false;
// right to left swipe
if(e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
Toast.makeText(getApplicationContext(), "Right Swipe", Toast.LENGTH_SHORT).show();
//i would like to make ImageView "image_swipe" move along with gesture
}
} catch (Exception e) {
}
return true;
}
See the below link, it may help you. The image movement when you swipe (onFling) the screen is available in this example.
CoverFlow Widget Example
I'm trying to implement a view that has both a longClickListener and a gesture dectector. Basically, I need a button to show a view when the user long clicks on the first view, and then I want to dectect a fling motion up. I would like to make it so that the user does not have to lift their finger at all, and hit both the longclick, and the fling motion.
Here is my code for the longClickListener:
flipCard.setOnLongClickListener(new View.OnLongClickListener() {
public boolean onLongClick(View view) {
answerRight.setVisibility(View.VISIBLE);
answerRight.startAnimation(AnimationUtils.loadAnimation(view.getContext(), R.anim.grow_from_middle));
answerWrong.setVisibility(View.VISIBLE);
answerWrong.startAnimation(AnimationUtils.loadAnimation(view.getContext(), R.anim.grow_from_middle));
return false;
}
});
Here is the code for my gesture dector:
gestureDetectorScore = new GestureDetector(new ScoreGestureDetector());
gestureListenerScore = new View.OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
if (gestureDetectorScore.onTouchEvent(event)) {
return true;
}
return false;
}
};
private class ScoreGestureDetector extends SimpleOnGestureListener {
private static final int SWIPE_MIN_DISTANCE = 5;
private static final int SWIPE_THRESHOLD_VELOCITY = 2;
#Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
try {
//if (Math.abs(e1.getX() - e2.getX()) > SWIPE_MAX_OFF_PATH)
//return false;
// right to left swipe
//if(e1.getY() - e2.getY() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
if(e1.getY() - e2.getY() > SWIPE_MIN_DISTANCE){
Toast.makeText(AndroidOrientationSensor.this, "Up Swipe", Toast.LENGTH_SHORT).show();
}
//else if (e2.getY() - e1.getY() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
else if (e2.getY() - e1.getY() > SWIPE_MIN_DISTANCE){
Toast.makeText(AndroidOrientationSensor.this, "Down Swipe", Toast.LENGTH_SHORT).show();
}
} catch (Exception e) {
// nothing
}
return false;
}
#Override
public boolean onDown(MotionEvent e1){
Toast.makeText(AndroidOrientationSensor.this, "Up Swipe", Toast.LENGTH_SHORT).show();
return true;
}
}
Finally, I am setting the gesture dectector to the the "flipCard" view like this:
flipCard.setOnTouchListener(gestureListenerScore);
Any help would be greatly appreciated.
I think the problem you're going to have is if the touch event is consumed by the button, then the second view won't receive it.
Even if it did, the fling I imagine will only get called when the user performs a fling from start to finish.
The only thing I can think of doing (despite it being very horrible / hacky) is to try and inset a fake up touch event. This might then allow the user to perform the fling, but this isn't particularly stable either.
Better way to handle it would be to have a view group consume the touch events, pass the touch events to a gesture detector to detect a long click, then set a flag within the view groups touch listener to indicate a fling is expected, then manually detect when prev y and current y go beyond a threshold. This will give you some idea of velocity but probably no where near as meaningful as the velocity provided in the onFling callback method.
What I ended up doing to solve this problem is placing a gestureDectector on the view and overriding the onDown method. This allowed me to simulate a click event. I was unable to get both a long click and a swipe event, but for my purposes the click event triggers during the swipe which seems to work well enough. Thanks to GauntFace for the inspiration.
The GestureListener also has a onLongPress event.