import org.chromium.content.browser.PositionObserver; //导入依赖的package包/类
HandleView(CursorController controller, int pos, View parent,
        PositionObserver parentPositionObserver) {
    super(parent.getContext());
    Context context = parent.getContext();
    mParent = parent;
    mController = controller;
    mContainer = new PopupWindow(context, null, android.R.attr.textSelectHandleWindowStyle);
    mContainer.setSplitTouchEnabled(true);
    mContainer.setClippingEnabled(false);

    TypedArray a = context.obtainStyledAttributes(TEXT_VIEW_HANDLE_ATTRS);
    mTextSelectHandleLeftRes = a.getResourceId(a.getIndex(LEFT), 0);
    mTextSelectHandleRes = a.getResourceId(a.getIndex(CENTER), 0);
    mTextSelectHandleRightRes = a.getResourceId(a.getIndex(RIGHT), 0);
    a.recycle();

    setOrientation(pos);

    // Convert line offset dips to pixels.
    mLineOffsetY = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
            LINE_OFFSET_Y_DIP, context.getResources().getDisplayMetrics());

    mAlpha = 1.f;

    mParentPositionListener = new PositionObserver.Listener() {
        @Override
        public void onPositionChanged(int x, int y) {
            updateParentPosition(x, y);
        }
    };
    mParentPositionObserver = parentPositionObserver;
}
 

import org.chromium.content.browser.PositionObserver; //导入依赖的package包/类
public SelectionHandleController(View parent, PositionObserver positionObserver) {
    mParent = parent;
    mPositionObserver = positionObserver;
}
 

import org.chromium.content.browser.PositionObserver; //导入依赖的package包/类
public InsertionHandleController(View parent, PositionObserver positionObserver) {
    mParent = parent;

    mContext = parent.getContext();
    mPositionObserver = positionObserver;
}