PullToRefreshListView.java 文件源码

private void init(Context context) {
    mFlipAnimation = new RotateAnimation(0, -180,
            RotateAnimation.RELATIVE_TO_SELF, 0.5f,
            RotateAnimation.RELATIVE_TO_SELF, 0.5f);
    mFlipAnimation.setInterpolator(new LinearInterpolator());
    mFlipAnimation.setDuration(250);
    mFlipAnimation.setFillAfter(true);
    mReverseFlipAnimation = new RotateAnimation(-180, 0,
            RotateAnimation.RELATIVE_TO_SELF, 0.5f,
            RotateAnimation.RELATIVE_TO_SELF, 0.5f);
    mReverseFlipAnimation.setInterpolator(new LinearInterpolator());
    mReverseFlipAnimation.setDuration(250);
    mReverseFlipAnimation.setFillAfter(true);

    mRefreshView = (LinearLayout) View.inflate(context, R.layout.pull_to_refresh_header, null);
    mRefreshViewText = (TextView) mRefreshView.findViewById(R.id.pull_to_refresh_text);
    mRefreshViewImage = (ImageView) mRefreshView.findViewById(R.id.pull_to_refresh_image);
    mRefreshViewProgress = (ProgressBar) mRefreshView.findViewById(R.id.pull_to_refresh_progress);
    mRefreshViewLastUpdated = (TextView) mRefreshView.findViewById(R.id.pull_to_refresh_updated_at);

    mRefreshState = PULL_TO_REFRESH;
    mRefreshViewImage.setMinimumHeight(50); //设置下拉最小的高度为50

    setFadingEdgeLength(0);
    setHeaderDividersEnabled(false);

    //把refreshview加入到listview的头部
    addHeaderView(mRefreshView);
    super.setOnScrollListener(this);
    mRefreshView.setOnClickListener(this);

    mRefreshView.measure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED);
    mRefreshViewHeight = mRefreshView.getMeasuredHeight();
    mRefreshOriginalTopPadding = -mRefreshViewHeight;

    resetHeaderPadding();
}