Hello, my friends, programmers, how are you, I hope very well
I have a problem with an app I'm doing for the University which has to control the volume by means of the screen, that is to say that if I press the screen up or down the volume of the device goes up or down the problem is that I could not capture the touch vertically someone can help me in that
You must implement the onTouchEvent() in the Activity.
Then you overwrite the onTouchEvent() .
private String TAG = GestureActivity.class.getSimpleName();
float initialX, initialY;
@Override
public boolean onTouchEvent(MotionEvent event) {
//mGestureDetector.onTouchEvent(event);
int action = event.getActionMasked();
switch (action) {
case MotionEvent.ACTION_DOWN:
initialX = event.getX();
initialY = event.getY();
Log.d(TAG, "Action was DOWN");
break;
case MotionEvent.ACTION_MOVE:
Log.d(TAG, "Action was MOVE");
break;
case MotionEvent.ACTION_UP:
float finalX = event.getX();
float finalY = event.getY();
Log.d(TAG, "Action was UP");
if (initialX < finalX) {
Log.d(TAG, "Left to Right swipe performed");
}
if (initialX > finalX) {
Log.d(TAG, "Right to Left swipe performed");
}
if (initialY < finalY) {
Log.d(TAG, "Up to Down swipe performed");
}
if (initialY > finalY) {
Log.d(TAG, "Down to Up swipe performed");
}
break;
case MotionEvent.ACTION_CANCEL:
Log.d(TAG,"Action was CANCEL");
break;
case MotionEvent.ACTION_OUTSIDE:
Log.d(TAG, "Movement occurred outside bounds of current screen element");
break;
}
return super.onTouchEvent(event);
}
You capture the touch event in your view
class CustomImageView extends ImageView {
public CustomImageView(Context context) {
super(context);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
int action = event.getActionMasked();
Log.d(TAG, String.valueOf(action));
return super.onTouchEvent(event);
}
}
And this for example your view.
ImageView imageView = (ImageView) findViewById(R.id.imageView1);
imageView.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
// have same code as onTouchEvent() (for the Activity) above
int action = event.getActionMasked();
Log.d(TAG, String.valueOf(action));
return true;
}
});
For a more detailed explanation you can visit this link.