当同时使用Zoom和ScrollView时,可能会导致手势冲突。为了避免这种冲突,可以使用GestureDetector来处理缩放手势,而不是使用单独的Zoom控件。可以按照以下代码示例来实现:
public class ZoomAndScrollActivity extends AppCompatActivity implements GestureDetector.OnGestureListener, GestureDetector.OnDoubleTapListener {
private ImageView imageView;
private GestureDetector mGestureDetector;
private float scale = 1f;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_zoom_and_scroll);
mGestureDetector = new GestureDetector(this, this);
mGestureDetector.setOnDoubleTapListener(this);
imageView = findViewById(R.id.image_view);
imageView.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
mGestureDetector.onTouchEvent(event);
return true;
}
});
}
@Override
public boolean onDown(MotionEvent e) {
return false;
}
@Override
public void onShowPress(MotionEvent e) {
}
@Override
public boolean onSingleTapUp(MotionEvent e) {
return false;
}
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
imageView.scrollBy((int) distanceX, (int) distanceY);
return true;
}
@Override
public void onLongPress(MotionEvent e) {
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
return false;
}
@Override
public boolean onSingleTapConfirmed(MotionEvent e) {
return false;
}
@Override
public boolean onDoubleTap(MotionEvent e) {
float maxScale = 2f;
float minScale = 0.5f;
if (scale == 1f) {
scale = maxScale;
} else {
scale = 1f;
}
imageView.setScaleX(scale);
imageView.setScaleY(scale);
return true;
}
@Override
public boolean onDoubleTapEvent(MotionEvent e) {
return false;
}
}
在上面的代码示例中,我们将缩放手势委托给GestureDetector处理,并使用ImageView的setScaleX和setScaleY方法来实现缩放效果。同时,我们使用imageView.scrollBy方法来处理滚动手势,从而实现ScrollView的效果。