Android-----下拉刷新整合到项目中

在app.gradle中添加依赖：compile 'in.srain.cube:ultra-ptr:1.0.11' //下拉刷新

布局文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:gravity="center"
    android:layout_height="match_parent">

    <in.srain.cube.views.ptr.PtrFrameLayout
        android:id="@+id/mPtrFrame"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <android.support.v7.widget.RecyclerView
            android:id="@+id/recycler_View"
            android:layout_width="match_parent"
            android:layout_height="match_parent">

        </android.support.v7.widget.RecyclerView>

    </in.srain.cube.views.ptr.PtrFrameLayout>


</LinearLayout>

逻辑处理：

public class RxJavaActivity extends AppCompatActivity {

    private BootstrapButton login , exit;
    private AlertDialogUtils utils;

    private PtrFrameLayout ptrFrame;    //下拉刷新
    //private TextView textView;
    //private ListView listView;
    List<Reception> listData = new ArrayList<>();

    private RecyclerView recyclerView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_rx_java);
        initData();
    }

    public void initData(){

        /*【获取对象数据】*/
        TransferData userData = (TransferData) getIntent().getSerializableExtra("userData");
        userData.show();

         /*【获取对象数组数据】*/
        List<TransferData> resultList = (List<TransferData>) getIntent().getSerializableExtra("list");
        resultList.get(0).show();
        resultList.get(1).show();

        Reception reception0 = new Reception();
        reception0.setImgPath(R.drawable.ic_launcher);
        reception0.setScope("我是第0条数据。");

        Reception reception1 = new Reception();
        reception1.setImgPath(R.drawable.ic_launcher);
        reception1.setScope("我是第1条数据。");
        listData.add(reception1);

        Reception reception2 = new Reception();
        reception2.setImgPath(R.drawable.ic_launcher);
        reception2.setScope("我是第2条数据。");
        listData.add(reception2);

        Reception reception3 = new Reception();
        reception3.setImgPath(R.drawable.ic_launcher);
        reception3.setScope("我是第3条数据。");
        listData.add(reception3);

        Reception reception4 = new Reception();
        reception4.setImgPath(R.drawable.ic_launcher);
        reception4.setScope("我是第4条数据。");
        listData.add(reception4);

        Reception reception5 = new Reception();
        reception5.setImgPath(R.drawable.ic_launcher);
        reception5.setScope("我是第5条数据。");
        listData.add(reception5);

        initUI();
    }


    private void initUI(){

        recyclerView = findViewById(R.id.recycler_View);
        /*【默认为纵向排列】*/
        //LinearLayoutManager layoutManager = new LinearLayoutManager(this);
        //recyclerView.setLayoutManager(layoutManager);

        /*【调用 LinearLayoutManager 的 setOrientation() 方法来设置布局的排列方向】*/
        //layoutManager.setOrientation(LinearLayoutManager.HORIZONTAL);


        /*【瀑布流布局】*/
        //StaggeredGridLayoutManager manager = new StaggeredGridLayoutManager(2,StaggeredGridLayoutManager.VERTICAL);
        //recyclerView.setLayoutManager(manager);

        /*【网格布局】*/
        GridLayoutManager gridlayout = new GridLayoutManager(this,2);
        recyclerView.setLayoutManager(gridlayout);

        RecyclerViewAdapter adapter = new RecyclerViewAdapter(listData);
        recyclerView.setAdapter(adapter);



//        ReceptionAdapter adapter = new ReceptionAdapter(this,R.layout.header,listData);
        ptrFrame = findViewById(R.id.mPtrFrame);    //下拉刷新实例化

//        listView = findViewById(R.id.ListRefresh);  //数据list
//        listView.setAdapter(adapter);               //与适配器绑定
//        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
//            @Override
//            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
//                Reception rece = listData.get(i);
//                AlertDialogUtils utils = new AlertDialogUtils(RxJavaActivity.this);
//                utils.AlertTitle(rece.getScope(),"success");
//            }
//        });


        //textView = findViewById(R.id.TestRefresh);
        //final PtrClassicDefaultHeader header = new PtrClassicDefaultHeader(this);          //经典的头部风格
        final MaterialHeader header = new MaterialHeader(this);                     //Material头部风格
        header.setPadding(0, PtrLocalDisplay.dp2px(15),0,0);
        // ptrFrame.setPinContent(true);//刷新时，保持内容不动，仅头部下移,默认,false
        // ptrFrame.setKeepHeaderWhenRefresh(true);//刷新时保持头部的显示，默认为true
        // ptrFrame.disableWhenHorizontalMove(true);//如果是ViewPager，设置为true，会解决ViewPager滑动冲突问题。
        ptrFrame.setHeaderView(header);
        ptrFrame.addPtrUIHandler(header);
        ptrFrame.setPtrHandler(new PtrHandler() {
            /**【检查是否可以执行下来刷新，比如列表为空或者列表第一项在最上面时】**/
            @Override
            public boolean checkCanDoRefresh(PtrFrameLayout frame, View content, View header) {
                return PtrDefaultHandler.checkContentCanBePulledDown(frame, content, header);
            }
            /**【加载数据时触发，可在这里做线程获取数据等操作】**/
            @Override
            public void onRefreshBegin(PtrFrameLayout frame) {
                //textView.setText("下拉刷新完成");
//                ReceptionAdapter adapter = new ReceptionAdapter(RxJavaActivity.this,R.layout.header,listData);
//                listView.setAdapter(adapter);               //与适配器绑定

                ptrFrame.refreshComplete();             //刷新完成
                //ptrFrame.autoRefresh();//自动刷新
            }
        });


    }
}

子项布局：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:layout_gravity="center"
    android:gravity="center_horizontal">

    <ImageView
        android:id="@+id/image_View"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@mipmap/ic_launcher"/>

    <TextView
        android:id="@+id/text_View"
        android:gravity="center"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello Word"
        android:textSize="18sp"/>

</LinearLayout>

适配器编写：

public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.viewHolder> {

    private List<Reception> receptionList = new ArrayList<>();

    /**【定义一个内部类，展示的数据由内部类决定】**/
    static class viewHolder extends RecyclerView.ViewHolder {
        ImageView imageView;
        TextView textView;

        public viewHolder(View view) {
            super(view);
            imageView =  view.findViewById(R.id.image_View);
            textView = view.findViewById(R.id.text_View);
        }
    }

    /**【构造函数初始化数据】**/
    public RecyclerViewAdapter(List<Reception> list){
        this.receptionList = list;
    }


    @Override
    public viewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.header,parent,false);
        final viewHolder holder = new viewHolder(view);
        /*【实现点击事件】*/
        holder.imageView.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View view) {
                int position = holder.getAdapterPosition();
                Reception reception = receptionList.get(position);
                Toast.makeText(view.getContext(),reception.getScope(),Toast.LENGTH_LONG).show();
                return false;
            }
        });
        holder.textView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                int position = holder.getAdapterPosition();
                Reception reception = receptionList.get(position);
                Log.e("拿到的数据",reception.getScope());
            }
        });
        return holder;
    }

    @Override
    public void onBindViewHolder(viewHolder holder, int position) {
        Reception reception = receptionList.get(position);
        holder.imageView.setImageResource(reception.getImgPath());
        holder.textView.setText(reception.getScope());
    }

    @Override
    public int getItemCount() {
        return receptionList.size();
    }
}

Reception只是一个普通的实体类，里面写有 set 和 get 方法

看下我注释掉的代码，你会发现我这里也附有 RecyclerView 的使用