SuperSwipeRefreshLayout.java 文件源码

@SuppressWarnings("deprecation")
public SuperSwipeRefreshLayout(Context context, AttributeSet attrs) {
    super(context, attrs);

    /**
     * getScaledTouchSlop是一个距离，表示滑动的时候，手的移动要大于这个距离才开始移动控件。如果小于这个距离就不触发移动控件
     */
    mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();

    mMediumAnimationDuration = getResources().getInteger(
            android.R.integer.config_mediumAnimTime);

    setWillNotDraw(false);
    mDecelerateInterpolator = new DecelerateInterpolator(
            DECELERATE_INTERPOLATION_FACTOR);

    final TypedArray a = context
            .obtainStyledAttributes(attrs, LAYOUT_ATTRS);
    setEnabled(a.getBoolean(0, true));
    a.recycle();

    WindowManager wm = (WindowManager) context
            .getSystemService(Context.WINDOW_SERVICE);
    Display display = wm.getDefaultDisplay();
    final DisplayMetrics metrics = getResources().getDisplayMetrics();
    mHeaderViewWidth = (int) display.getWidth();
    mFooterViewWidth = (int) display.getWidth();
    mHeaderViewHeight = (int) (HEADER_VIEW_HEIGHT * metrics.density);
    mFooterViewHeight = (int) (HEADER_VIEW_HEIGHT * metrics.density);
    defaultProgressView = new CircleProgressView(getContext());
    createHeaderViewContainer();
    createFooterViewContainer();
    ViewCompat.setChildrenDrawingOrderEnabled(this, true);
    mSpinnerFinalOffset = DEFAULT_CIRCLE_TARGET * metrics.density;
    density = metrics.density;
    mTotalDragDistance = mSpinnerFinalOffset;
}