android SwipeRefreshLayout 实现 下拉刷新 上拉加载

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选择匿名的用户   2021-6-2 15:07   11   0

上图


没有什么注释 没有demo 但是 思路清晰 好好理解看一下

xml

[html] view plain copy 在CODE上查看代码片 派生到我的代码片
  1. <?xml version="1.0" encoding="utf-8"?>
  2. <android.support.v4.widget.SwipeRefreshLayout
  3. xmlns:android="http://schemas.android.com/apk/res/android"
  4. xmlns:tools="http://schemas.android.com/tools"
  5. android:id="@+id/swipe_refresh_widget"
  6. android:layout_width="match_parent"
  8. android:layout_height="match_parent"
  9. tools:context="com.jsu.whr.recyclerview.Main3Activity">
  10. <android.support.v7.widget.RecyclerView
  11. android:id="@+id/recycle_view"
  12. android:layout_width="match_parent"
  13. android:layout_height="wrap_content">
  15. </android.support.v7.widget.RecyclerView>
  16. </android.support.v4.widget.SwipeRefreshLayout>

主activity

[java] view plain copy 在CODE上查看代码片 派生到我的代码片
  1. package com.jsu.whr.recyclerview;
  3. import android.os.Handler;
  4. import android.support.v4.widget.SwipeRefreshLayout;
  5. import android.support.v7.app.AppCompatActivity;
  6. import android.os.Bundle;
  7. import android.support.v7.widget.LinearLayoutManager;
  8. import android.support.v7.widget.RecyclerView;
  10. import com.jsu.whr.myapplication.R;
  12. import java.util.ArrayList;
  13. import java.util.List;
  15. public class Main3Activity extends AppCompatActivity implements SwipeRefreshLayout.OnRefreshListener {
  16. SwipeRefreshLayout mSwipeRefreshLayout;
  17. RecyclerView mRecyclerView;
  18. MyAdapter adapter;
  19. List<String> list = new ArrayList<String>();
  20. LinearLayoutManager mLayoutManager;
  21. @Override
  22. protected void onCreate(Bundle savedInstanceState) {
  23. super.onCreate(savedInstanceState);
  24. setContentView(R.layout.activity_main3);
  25. mSwipeRefreshLayout = (SwipeRefreshLayout) this.findViewById(R.id.swipe_refresh_widget);
  26. mSwipeRefreshLayout.setColorSchemeResources(
  27. R.color.black,
  28. R.color.read,
  29. R.color.green,
  30. R.color.blue);
  31. mSwipeRefreshLayout.setOnRefreshListener(this);//下拉监听
  32. mRecyclerView = (RecyclerView) this.findViewById(R.id.recycle_view);
  33. mLayoutManager = new LinearLayoutManager(this);
  34. mRecyclerView.setLayoutManager(mLayoutManager);
  35. mRecyclerView.setOnScrollListener(mOnScrollListener);
  36. adapter = new MyAdapter(this);
  37. mRecyclerView.setAdapter(adapter);
  38. }
  39. private RecyclerView.OnScrollListener mOnScrollListener = new RecyclerView.OnScrollListener() {
  40. private int lastVisibleItem;//窗体可见最后一个item
  41. @Override
  42. public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
  43. super.onScrollStateChanged(recyclerView, newState);
  44. if (newState == RecyclerView.SCROLL_STATE_IDLE//滑动状态 SCROLL_STATE_IDLE表示停止
  45. && lastVisibleItem + 1 == adapter.getItemCount()
  46. && adapter.isShowFooter()) {//条件表示 滑到最底端了
  47. //加载更多
  48. handler.postDelayed(new Runnable() {
  49. @Override
  50. public void run() {
  51. list.addAll(loadNewData());
  52. adapter.notifyDataSetChanged();
  53. }
  54. },1000);
  57. }
  58. }
  59. @Override
  60. public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
  61. super.onScrolled(recyclerView, dx, dy);
  62. lastVisibleItem = mLayoutManager.findLastVisibleItemPosition();
  63. }
  64. };
  65. @Override
  66. public void onRefresh() {
  67. handler.postDelayed(new Runnable() {
  68. @Override
  69. public void run() {
  70. if(list!=null){
  71. list.clear();
  72. }
  73. list.addAll(loadData());
  74. adapter.setDatalist(list);
  75. mSwipeRefreshLayout.setRefreshing(false);
  76. }
  77. },4000);
  78. }
  79. public List<String> loadData(){
  80. List<String> listdata = new ArrayList<String>();
  81. for(int i=0;i<20;i++){
  82. list.add("---->"+i);
  83. }
  84. return listdata;
  85. }
  86. public List<String> loadNewData(){
  87. List<String> listdata = new ArrayList<String>();
  88. for(int i=0;i<20;i++){
  89. list.add("---xin->"+i);
  90. }
  91. return listdata;
  92. }
  93. Handler handler = new Handler(){
  95. };
  96. }
adapter
[java] view plain copy 在CODE上查看代码片 派生到我的代码片
  1. package com.jsu.whr.recyclerview;
  3. import android.content.Context;
  4. import android.support.v7.widget.RecyclerView;
  5. import android.util.Log;
  6. import android.view.LayoutInflater;
  7. import android.view.View;
  8. import android.view.ViewGroup;
  9. import android.widget.TextView;
  11. import com.jsu.whr.myapplication.R;
  13. import java.util.ArrayList;
  14. import java.util.List;
  16. /**
  17. * Created by k90 on 2016-09-02.
  18. */
  19. public class MyAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder>{
  20. ItemViewHolder mItemViewHolder;
  21. List<String>Datalist = new ArrayList<String>();
  22. Context context;
  23. private boolean mShowFooter = true;
  24. private static final int TYPE_ITEM = 0;
  25. private static final int TYPE_FOOTER = 1;
  26. public void setDatalist(List<String> datalist) {
  27. Datalist = datalist;
  28. this.notifyDataSetChanged();
  29. }
  31. public MyAdapter(Context context) {
  32. this.context = context;
  33. }
  35. @Override
  36. public int getItemViewType(int position) {
  37. // 最后一个item设置为footerView
  38. if(!mShowFooter) {
  39. return TYPE_ITEM;
  40. }
  41. if (position + 1 == getItemCount()) {
  42. return TYPE_FOOTER;
  43. } else {
  44. return TYPE_ITEM;
  45. }
  46. }
  47. public boolean isShowFooter() {
  48. return this.mShowFooter;
  49. }
  50. @Override
  51. public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
  52. if(viewType == TYPE_ITEM) {
  53. View view = LayoutInflater.from(context).inflate(R.layout.items, viewGroup, false);
  54. mItemViewHolder = new ItemViewHolder(view);
  55. return mItemViewHolder;
  56. }
  57. else{
  58. View view = LayoutInflater.from(viewGroup.getContext()).inflate(
  59. R.layout.footer, null);
  60. view.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
  61. ViewGroup.LayoutParams.WRAP_CONTENT));
  62. return new FooterViewHolder(view);
  63. }
  64. }
  66. @Override
  67. public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int i) {
  68. if(viewHolder instanceof ItemViewHolder) {
  69. String s = Datalist.get(i);
  70. if (s == null) {
  71. return;
  72. }
  73. ((ItemViewHolder) viewHolder).tv.setText(s);
  74. }
  75. }
  77. @Override
  78. public int getItemCount() {
  79. return Datalist.size();
  80. }
  81. public class FooterViewHolder extends RecyclerView.ViewHolder {
  83. public FooterViewHolder(View view) {
  84. super(view);
  85. }
  87. }
  88. public void isShowFooter(boolean showFooter) {
  89. this.mShowFooter = showFooter;
  90. }
  91. class ItemViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
  92. TextView tv;
  93. public ItemViewHolder(View itemView) {
  94. super(itemView);
  95. tv = (TextView) itemView.findViewById(R.id.tv);
  96. tv.setOnClickListener(this);
  97. }
  99. @Override
  100. public void onClick(View v) {
  102. if(mOnItemClickListtenet!=null){
  103. mOnItemClickListtenet.onItemClick(v,this.getPosition());
  104. }
  105. }
  106. }
  107. OnItemClickListtenet mOnItemClickListtenet;
  108. public interface OnItemClickListtenet{
  109. void onItemClick(View v ,int position);
  110. }
  112. public void setmOnItemClickListtenet(OnItemClickListtenet mOnItemClickListtenet) {
  113. this.mOnItemClickListtenet = mOnItemClickListtenet;
  114. }
  115. }

底部layout
[html] view plain copy 在CODE上查看代码片 派生到我的代码片
  1. <?xml version="1.0" encoding="utf-8"?>
  2. <LinearLayout
  3. xmlns:android="http://schemas.android.com/apk/res/android"
  4. android:id="@+id/load_layout"
  5. android:layout_width="match_parent"
  6. android:layout_height="wrap_content"
  7. android:gravity="center"
  8. android:orientation="horizontal"
  9. android:paddingBottom="12dip"
  10. android:paddingTop="12dip" >
  12. <ProgressBar
  13. style="?android:attr/progressBarStyleSmall"
  14. android:layout_width="wrap_content"
  15. android:layout_height="wrap_content" />
  17. <TextView
  18. android:id="@+id/more_data_msg"
  19. android:layout_width="wrap_content"
  20. android:layout_height="wrap_content"
  21. android:textSize="16sp"
  22. android:layout_marginLeft="10dp"
  23. android:text="正在加载..." />
  24. </LinearLayout>
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