android developed an example of left and right gesture recognition for activity
- 2020-05-30 21:03:49
- OfStack
The development of android adds left and right gesture recognition for activity, such as right sliding to close the current page.
/*
* for Left and right hand gestures
* 1. Copy the following to the target Activity
* 2. The target Activity the onCreate() call initGesture()
* 3. The target Activity Need to be implements OnTouchListener, OnGestureListener
*/
private GestureDetector mGestureDetector;
private int verticalMinDistance = 180;
private int minVelocity = 0;
private void initGesture() {
mGestureDetector = new GestureDetector((OnGestureListener) this);
}
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
if (e1.getX() - e2.getX() > verticalMinDistance && Math.abs(velocityX) > minVelocity) {
// switch Activity
// Intent intent = new Intent(ViewSnsActivity.this, UpdateStatusActivity.class);
// startActivity(intent);
//Toast.makeText(this, " The left hand gestures ", Toast.LENGTH_SHORT).show();
} else if (e2.getX() - e1.getX() > verticalMinDistance && Math.abs(velocityX) > minVelocity) {
// switch Activity
// Intent intent = new Intent(ViewSnsActivity.this, UpdateStatusActivity.class);
// startActivity(intent);
//Toast.makeText(this, " To the right hand the potential ", Toast.LENGTH_SHORT).show();
finish();
overridePendingTransition(R.anim.push_right_in, R.anim.push_right_out);
}
return false;
}
@Override
public void onLongPress(MotionEvent arg0) {
// TODO Auto-generated method stub
}
@Override
public boolean onScroll(MotionEvent arg0, MotionEvent arg1, float arg2,
float arg3) {
// TODO Auto-generated method stub
return false;
}
@Override
public void onShowPress(MotionEvent arg0) {
// TODO Auto-generated method stub
}
@Override
public boolean onSingleTapUp(MotionEvent arg0) {
// TODO Auto-generated method stub
return false;
}
@Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
return mGestureDetector.onTouchEvent(event);
}
@Override
public boolean onDown(MotionEvent arg0) {
// TODO Auto-generated method stub
return false;
}
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
mGestureDetector.onTouchEvent(ev);
return super.dispatchTouchEvent(ev);
}
push_right_in.xml
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<translate android:fromXDelta="-100%p" android:toXDelta="0"
android:duration="500" />
<alpha android:fromAlpha="0.1" android:toAlpha="1.0"
android:duration="500"/>
</set>
push_right_out.xml
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<translate android:fromXDelta="0" android:toXDelta="100%p"
android:duration="500" />
<alpha android:fromAlpha="1.0" android:toAlpha="0.1"
android:duration="500"/>
</set>