SwipeRefreshLayout

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SwipeRefreshLayout是android自带的下拉刷新控件.

基本使用

基本代码:

XML布局:

Activity代码:

public class SwipeRefreshLayoutDemo extends Activity implements OnRefreshListener {    private SwipeRefreshLayout refreshLayout;    private RecyclerView recycler;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_swipe);        initView();        initData();    }    private void initView() {        refreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipe);        recycler = (RecyclerView) findViewById(R.id.recycler);    }    private void initData() {        // 下拉刷新        refreshLayout.setOnRefreshListener(this); // 设置刷新监听        refreshLayout.setColorSchemeResources(R.color.orange, R.color.green, R.color.purple); // 进度动画颜色        refreshLayout.setProgressBackgroundColorSchemeResource(R.color.swipefefresh_bg); // 进度背景颜色        // RecycleView        GridLayoutManager layoutManager = new GridLayoutManager(this,3);        layoutManager.setOrientation(RecyclerView.VERTICAL);        recycler.setLayoutManager(layoutManager);        recycler.setAdapter(new GridAdapter(this,true));    }    @Override    public void onRefresh() {        refreshLayout.postDelayed(new Runnable() { // 发送延迟消息到消息队列            @Override            public void run() {                refreshLayout.setRefreshing(false); // 是否显示刷新进度;false:不显示            }        },3000);    }}

效果:

源码研究

Code方法研究:

public class SwipeRefreshLayout extends ViewGroup implements NestedScrollingParent, NestedScrollingChild {    public static final int LARGE = MaterialProgressDrawable.LARGE; //ProgressBar style

>

public static final int DEFAULT = MaterialProgressDrawable.DEFAULT;

public void setProgressViewOffset(boolean scale, int start, int end) { } //设置滚动View位置,一般在刚打开界面时才用 [scale:true测量;start/end偏移量] {重要}    public void setProgressViewEndTarget(boolean scale, int end) { } //设置滚动View休息位置 [scale:true测量;end偏移量]    public void setSize(int size) { } //大小(样式) [LARGE/DEFAULT] {重要}    public void setOnRefreshListener(OnRefreshListener listener) { } //设置下拉刷新 {重要}    public void setRefreshing(boolean refreshing) { } //是否显示刷新进度:true显示/false隐藏 {重要}    public void setProgressBackgroundColorSchemeResource(@ColorRes int colorRes) { } //刷新进度背景颜色 {重要}    public void setProgressBackgroundColorSchemeColor(@ColorInt int color) { }    public void setColorSchemeResources(@ColorRes int... colorResIds) { } //刷新进度颜色 {重要}    public void setColorSchemeColors(int... colors) { }    public boolean isRefreshing() { } //是否在刷新    public void setDistanceToTriggerSync(int distance) { } //手指滑动多少距离后刷新进度同步下降    public int getProgressCircleDiameter() { } // 获取刷新进度圆的直径    public boolean canChildScrollUp() { } //布局可以向上滚动,Override这个方法    public interface OnRefreshListener {        public void onRefresh();    }}

案例源代码: