我想使用滑动手势来控制音量,如果我在屏幕上从上到下滑动,它应该会降低,而我从下到上滑动,它应该会增加音量。而不是使用音量按钮。
最佳答案
abstract class OnSwipeTouchListener implements OnTouchListener {
enum Direction{
LEFT, RIGHT, UP, DOWN;
}
private final static String TAG = "ClickFrame";
private final static int SWIPE_THRESHOLD = 100;
// 0: uninitialized
// 1: horizontal
// 2: vertical
private int initialGesture;
protected float initialX;
protected float initialY;
private float decidedX;
private float decidedY;
@Override
public boolean onTouch(View v, MotionEvent event) {
int action = event.getActionMasked();
switch (action) {
case MotionEvent.ACTION_DOWN:
initialX = event.getX();
initialY = event.getY();
initialGesture = 0;
break;
case MotionEvent.ACTION_MOVE:
float deltaX;
float deltaY;
if(initialGesture == 0) {
deltaX = event.getX() - initialX;
deltaY = event.getY() - initialY;
}
else{
deltaX = event.getX() - decidedX;
deltaY = event.getY() - decidedY;
}
if(initialGesture == 0 && Math.abs(deltaX) > SWIPE_THRESHOLD){
initialGesture = 1;
decidedX = event.getX();
decidedY = event.getY();
if(deltaX > 0){
onBeforeMove(Direction.RIGHT);
}
else{
onBeforeMove(Direction.LEFT);
}
}
else if(initialGesture == 0 && Math.abs(deltaY) > SWIPE_THRESHOLD){
initialGesture = 2;
decidedX = event.getX();
decidedY = event.getY();
if(deltaY > 0){
onBeforeMove(Direction.DOWN);
}
else{
onBeforeMove(Direction.UP);
}
}
if(initialGesture == 1){
if(deltaX > 0){
onMove(Direction.RIGHT, deltaX);
}
else{
onMove(Direction.LEFT, -deltaX);
}
}
else if(initialGesture == 2){
if(deltaY > 0){
onMove(Direction.DOWN, deltaY);
}
else{
onMove(Direction.UP, -deltaY);
}
}
break;
case MotionEvent.ACTION_UP:
deltaX = event.getX() - initialX;
deltaY = event.getY() - initialY;
if(initialGesture == 0){
onClick();
return true;
}
onAfterMove();
initialGesture = 0;
return true;
case MotionEvent.ACTION_CANCEL:
break;
case MotionEvent.ACTION_OUTSIDE:
break;
}
return true;
}
public abstract void onMove(Direction dir, float diff);
public abstract void onClick();
public abstract void onAfterMove();
public abstract void onBeforeMove(Direction dir);
}
然后 mClickFrame.setOnTouchListener(clickFrameSwipeListener);
关于android - 使用从上到下的滑动手势控制android中的音量,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/48679812/