常用的刷新技术（二）——Ultra-Pull-To-Refresh

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Ultra-Pull-To-Refresh

效果图

文字有闪动的效果

消失的时候文字有坍塌的效果

使用步骤

1.导包

compile ‘in.srain.cube:ultra-ptr:1.0.11’

2.布局文件

<in.srain.cube.views.ptr.PtrFrameLayout        android:id="@+id/ptrFrameLayout_main"        android:layout_width="match_parent"        android:layout_height="match_parent">        <android.support.v7.widget.RecyclerView            android:id="@+id/recyclerView_main"            android:layout_width="match_parent"            android:layout_height="match_parent"/>    </in.srain.cube.views.ptr.PtrFrameLayout>

布局文件中用PtrFrameLayout包裹RecyclerView或者ListView

3.编写Java代码

MainActivity

public class MainActivity extends AppCompatActivity {    private Context mContext = this;//上下文    private PtrFrameLayout ptrFrameLayout_main;    private RecyclerView recyclerView_main;    private LinearLayoutManager linearLayoutManager;//RecyclerView的布局管理器    private RecyclerViewAdapter adapter = null;//适配器    private List<String> totalList = new ArrayList<>();//RecyclerView的数据源    private int length = 30;    private int lastVisibleItemPosition = 0;//最后一个可见条目的下标（position）    Handler handler=new Handler();    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        //调用初始化控件的方法        initView();    }    private void initView() {        //绑定PtrFrameLayout        ptrFrameLayout_main = (PtrFrameLayout) findViewById(R.id.ptrFrameLayout_main);        //绑定RecyclerView        recyclerView_main = (RecyclerView) findViewById(R.id.recyclerView_main);        //给RecyclerView设置布局管理器        linearLayoutManager = new LinearLayoutManager(                mContext, LinearLayoutManager.VERTICAL, false);        recyclerView_main.setLayoutManager(linearLayoutManager);        //调用加载数据的方法，给RecyclerView获取数据源        loadData();        //给RecyclerView设置适配器        adapter = new RecyclerViewAdapter(mContext, totalList);        recyclerView_main.setAdapter(adapter);        //使用PtrFrameLayout实现下拉刷新        //效果1：设置默认的经典的头视图        PtrClassicDefaultHeader defaultHeader = new PtrClassicDefaultHeader(mContext);        //效果2：特殊效果，目前只支持英文字符（闪动的文字Header：闪动文字效果的header）        StoreHouseHeader storeHouseHeader = new StoreHouseHeader(this);        //storeHouseHeader.setPadding(0, 30, 0, 0);        //设置背景颜色为黑色        storeHouseHeader.setBackgroundColor(Color.BLACK);        //设置文字的颜色为白色        storeHouseHeader.setTextColor(Color.WHITE);        // 文字只能是0-9,a-z不支持中文        storeHouseHeader.initWithString("loading...");        //设置头视图        ptrFrameLayout_main.setHeaderView(storeHouseHeader);        // 绑定UI与刷新状态的监听        ptrFrameLayout_main.addPtrUIHandler(storeHouseHeader);        // 添加刷新动作监听        ptrFrameLayout_main.setPtrHandler(new PtrDefaultHandler() {            @Override            public void onRefreshBegin(PtrFrameLayout frame) {                //开启一个子线程，模拟网络访问                new Thread(new Runnable() {                    @Override                    public void run() {                        try {                            //让子线程睡两秒才让刷新图标消失                            Thread.sleep(2000);                            // 刷新完成，让刷新Loading消失                            ptrFrameLayout_main.refreshComplete();                        } catch (InterruptedException e) {                            e.printStackTrace();                        }                    }                }).start();            }        });        //因为UltraPullToRefresh只能实现下拉刷新，所以上拉加载只有通过上拉加载RecyclerView来实现        recyclerView_main.addOnScrollListener(new RecyclerView.OnScrollListener() {            @Override            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {                super.onScrolled(recyclerView, dx, dy);                //通过线性布局管理器找到最后一个可见的item条目的下标（position）                lastVisibleItemPosition = linearLayoutManager.findLastVisibleItemPosition();            }            @Override            public void onScrollStateChanged(RecyclerView recyclerView, int newState) {                super.onScrollStateChanged(recyclerView, newState);                //如果最后一个可见条目的下标（position）等于RecyclerView的长度&&当前的状态为停止滑动                if (lastVisibleItemPosition + 1 == adapter.getItemCount() && newState ==                        RecyclerView.SCROLL_STATE_IDLE) {                    Toast.makeText(mContext, "正在加载...", Toast.LENGTH_SHORT).show();                    //长度加30                    length += 30;                    //重写加载数据                    loadData();                    //刷新                    adapter.reloadRecyclerView(totalList, false);                }            }        });    }    /**     * 加载数据     */    private void loadData() {        for (int i = 0; i < length; i++) {            totalList.add("titles" + i);        }        // 刷新完成，让刷新Loading消失        ptrFrameLayout_main.refreshComplete();    }}

适配器

public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {    private Context context = null;//上下文    private List<String> list = new ArrayList<>();//数据源    private LayoutInflater inflater = null;//布局填充器    public RecyclerViewAdapter(Context context, List<String> list) {        this.context = context;        this.list = list;        inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);    }    @Override    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        View view = inflater.inflate(R.layout.item_recyclerview_main, parent, false);        return new ViewHolder(view);    }    @Override    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {        if (holder instanceof ViewHolder) {            ViewHolder viewHolder = (ViewHolder) holder;            viewHolder.textView_main_details.setText(list.get(position));        }    }    @Override    public int getItemCount() {        return list == null ? 0 : list.size();    }    class ViewHolder extends RecyclerView.ViewHolder {        private TextView textView_main_details;        public ViewHolder(View convertView) {            super(convertView);            textView_main_details = ((TextView) convertView.findViewById(R.id.textView_main_details));        }    }    /**     * 刷新RecyclerView     * @param _list     * @param isClear     */    public void reloadRecyclerView(List<String> _list, boolean isClear) {        if (isClear) {            list.clear();        }        list.addAll(_list);        notifyDataSetChanged();    }}

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