Android-PullToRefresh(一)

先讲下这篇写啥东西，也就是这家伙（chrisbanes）写的一个上拉下拉刷新的Demo，连接https://github.com/fengcunhan/Android-PullToRefresh

东西弄下来之后，会看到library和sample 2个文件夹，至于library怎么用，先看看官网的资料http://developer.android.com/tools/projects/projects-eclipse.html#ReferencingLibraryProject

注意：如果勾选了library，那么这个项目是不能运行的，会提示：android library projects cannot be launched。所以注意了。

其实library怎么用，很简单，就是你新建个Android项目，在其他项目中复制.classpath和.project文件到library下面，使之成为一个Android项目（只是这个项目是被引用的项目），如果你不怕麻烦也可以新建一个Android项目，把有用的文件对应拷贝到新建的Android项目中。

sample文件夹也一样。在该例子中有4个，PullToRefreshExpandableListActivity，PullToRefreshGridActivity，PullToRefreshListActivity，PullToRefreshWebViewActivity

在应用开发中最常用的当属 PullToRefreshListActivity

接下来贴点代码如何把这个例子搬到自己的项目中：代码来源library中的，

com.handmark.pulltorefresh.library.internal.EmptyViewMethodAccessor

com.handmark.pulltorefresh.library.internal.LoadingLayout

com.handmark.pulltorefresh.library.PullToRefreshAdapterViewBase<T extends AbsListView>

com.handmark.pulltorefresh.library.PullToRefreshBase<T extends View>

com.handmark.pulltorefresh.library.PullToRefreshListView

这里面的5个类就可以组建你想要的上拉下拉组件，当然还需要一些res文件了

当然也需要改动:

     com.handmark.pulltorefresh.library.PullToRefreshBase类中

private void init(Context context, AttributeSet attrs) {

        setOrientation(LinearLayout.VERTICAL);

        touchSlop = ViewConfiguration.getTouchSlop();

        // Styleables from XML first
        //final TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.PullToRefresh);
        //mode = a.getInteger(R.styleable.PullToRefresh_mode, MODE_PULL_DOWN_TO_REFRESH);
        //Styleables from XML modify last
        mode = 0x3;
        
        
        // Refreshable View
        // By passing the attrs, we can add ListView/GridView params via XML
        refreshableView = this.createRefreshableView(context, attrs);
        this.addRefreshableView(context, refreshableView);

        // Loading View Strings
        String pullLabel = context.getString(R.string.pull_to_refresh_pull_label);
        String refreshingLabel = context.getString(R.string.pull_to_refresh_refreshing_label);
        String releaseLabel = context.getString(R.string.pull_to_refresh_release_label);

        // Add Loading Views
        if (mode == MODE_PULL_DOWN_TO_REFRESH || mode == MODE_BOTH) {
            headerLayout = new LoadingLayout(context, MODE_PULL_DOWN_TO_REFRESH, releaseLabel, pullLabel,
                    refreshingLabel);
            addView(headerLayout, 0, new LinearLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,
                    ViewGroup.LayoutParams.WRAP_CONTENT));
            measureView(headerLayout);
            headerHeight = headerLayout.getMeasuredHeight();
        }
        if (mode == MODE_PULL_UP_TO_REFRESH || mode == MODE_BOTH) {
            footerLayout = new LoadingLayout(context, MODE_PULL_UP_TO_REFRESH, releaseLabel, pullLabel, refreshingLabel);
            addView(footerLayout, new LinearLayout.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,
                    ViewGroup.LayoutParams.WRAP_CONTENT));
            measureView(footerLayout);
            headerHeight = footerLayout.getMeasuredHeight();
        }

        // Styleables from XML modify first
        /*if (a.hasValue(R.styleable.PullToRefresh_headerTextColor)) {
            final int color = a.getColor(R.styleable.PullToRefresh_headerTextColor, Color.BLACK);
            if (null != headerLayout) {
                headerLayout.setTextColor(color);
            }
            if (null != footerLayout) {
                footerLayout.setTextColor(color);
            }
        }
        if (a.hasValue(R.styleable.PullToRefresh_headerBackground)) {
            this.setBackgroundResource(a.getResourceId(R.styleable.PullToRefresh_headerBackground, Color.WHITE));
        }
        if (a.hasValue(R.styleable.PullToRefresh_adapterViewBackground)) {
            refreshableView.setBackgroundResource(a.getResourceId(R.styleable.PullToRefresh_adapterViewBackground,
                    Color.WHITE));
        }
        a.recycle();*/
        //Styleables from XML modify last
        if (null != headerLayout) {
            headerLayout.setTextColor(Color.BLACK);
        }
        if (null != footerLayout) {
            footerLayout.setTextColor(Color.BLACK);
        }
        
        // Hide Loading Views
        switch (mode) {
            case MODE_BOTH:
                setPadding(0, -headerHeight, 0, -headerHeight);
                break;
            case MODE_PULL_UP_TO_REFRESH:
                setPadding(0, 0, 0, -headerHeight);
                break;
            case MODE_PULL_DOWN_TO_REFRESH:
            default:
                setPadding(0, -headerHeight, 0, 0);
                break;
        }

        // If we're not using MODE_BOTH, then just set currentMode to current
        // mode
        if (mode != MODE_BOTH) {
            currentMode = mode;
        }
    }

修改前和修改后的代码都有注释

至于这个组件该怎么用还是自己琢磨把///

欢迎拍砖

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前段时间由于工作太忙，故没有上传demo，特此补上...

 Threew_PullToRefresh-master.rar

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最近在网上查了点资料，关于Android Library的参考资料

官网的资料

Android Library

Android 公共库的建立方法

github入门到精通