Android自定义listview布局实现上拉加载下拉刷新功能

package com.example.mic.testdemo.view; import android.annotation.TargetApi; import android.content.Context; import android.os.Build; import android.os.Bundle; import android.util.AttributeSet; import android.util.Log; import android.view.LayoutInflater; import android.view.MotionEvent; import android.view.View; import android.view.ViewGroup; import android.view.animation.Animation; import android.view.animation.LinearInterpolator; import android.view.animation.RotateAnimation; import android.widget.AbsListView; import android.widget.ImageView; import android.widget.ListView; import android.widget.ProgressBar; import android.widget.TextView; import com.example.mic.testdemo.R; import java.text.SimpleDateFormat; /**  * Created by DFLENOVO on 2016/8/3.  */ public class AutoListView extends ListView implements AbsListView.OnScrollListener {   public static final String FOOTER = "FOOTER";   public static final String HEADER = "HEADER";   private static final int PULL = 1;   private static final int NONE = 0;   //  private static final int RELEASE = 2;   private static final int REFRESHING = 2;   private static final int SPACE = 20;   private static final String TAG = "AutoListView";   private RotateAnimation downAnimation;   private RotateAnimation upAnimation;   private Context context;   private LayoutInflater inflater;   private View footer;   private View header;   private int headerContentInitialHeight;   private int headerContentHeight;   private OnRefreshListener onRefreshListener;   private boolean loadEnable;   private OnLoadListener onLoadListener;   private int firstVisibleItem;   private boolean isLoadingMore = false;   private int startY;   private int state;   private ImageView iv_pull;   private int footerViewHeight;   private ProgressBar mProgressBar;   private TextView tvState;   private TextView tvLastUpdateTime;   private boolean isScrollToBottom;   public AutoListView(Context context) {     super(context);     initView(context);   }   public AutoListView(Context context, AttributeSet attrs) {     super(context, attrs);     initView(context);   }   public AutoListView(Context context, AttributeSet attrs, int defStyleAttr) {     super(context, attrs, defStyleAttr);     initView(context);   }   @TargetApi(Build.VERSION_CODES.LOLLIPOP)   public AutoListView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {     super(context, attrs, defStyleAttr, defStyleRes);     initView(context);   }   private void initView(Context context) {     initHeaderView();     initFooterView();     this.setOnScrollListener(this); //   }   private void initHeaderView() {     header = View.inflate(getContext(), R.layout.pull_to_refresh_header, null);     iv_pull = (ImageView) header         .findViewById(R.id.iv_pull);     mProgressBar = (ProgressBar) header         .findViewById(R.id.pb_listview_header);     tvState = (TextView) header         .findViewById(R.id.tv_listview_header_state);     tvLastUpdateTime = (TextView) header         .findViewById(R.id.tv_listview_header_last_update_time);     // 设置最后刷新时间     tvLastUpdateTime.setText("最后刷新时间: " + getLastUpdateTime());     header.measure(0, 0); // 系统会帮我们测量出headerView的高度     headerContentHeight = header.getMeasuredHeight();     header.setPadding(0, -headerContentHeight, 0, 0);     this.addHeaderView(header,HEADER,true); // 向ListView的顶部添加一个view对象     initAnimation();   }   private void initAnimation() {     upAnimation = new RotateAnimation(0f, -180f,         Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,         0.5f);     upAnimation.setDuration(500);     upAnimation.setFillAfter(true); // 动画结束后, 停留在结束的位置上     downAnimation = new RotateAnimation(-180f, -360f,         Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,         0.5f);     downAnimation.setDuration(500);     downAnimation.setFillAfter(true); // 动画结束后, 停留在结束的位置上   }   private String getLastUpdateTime() {     SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");     return sdf.format(System.currentTimeMillis());   }   private void initFooterView() {     footer = View.inflate(getContext(), R.layout.foot_view, null);     footer.measure(0, 0);     footerViewHeight = footer.getMeasuredHeight();     footer.setPadding(0, -footerViewHeight, 0, 0);     this.addFooterView(footer,FOOTER,true);   }   private void measureView(View child) {     ViewGroup.LayoutParams p = child.getLayoutParams();     if (p == null) {       p = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,           ViewGroup.LayoutParams.WRAP_CONTENT);     }     int childWidthSpec = ViewGroup.getChildMeasureSpec(0, 0 + 0, p.width);     int lpHeight = p.height;     int childHeightSpec;     if (lpHeight > 0) {       childHeightSpec = MeasureSpec.makeMeasureSpec(lpHeight,           MeasureSpec.EXACTLY);//得到的是size。     } else {       childHeightSpec = MeasureSpec.makeMeasureSpec(0,           MeasureSpec.UNSPECIFIED);//得到的是子布局的实际大小。     }     child.measure(childWidthSpec, childHeightSpec);   }   private void topPadding(int topPadding) {     header.setPadding(header.getPaddingLeft(), topPadding,         header.getPaddingRight(), header.getPaddingBottom());     header.invalidate();   }   @Override   public void onScrollStateChanged(AbsListView absListView, int i) {     if (i == SCROLL_STATE_IDLE         || i == SCROLL_STATE_FLING) {       // 判断当前是否已经到了底部       if (isScrollToBottom && !isLoadingMore) {         isLoadingMore = true;         // 当前到底部         Log.i(TAG, "加载更多数据");         footer.setPadding(0, 0, 0, 0);         this.setSelection(this.getCount());         if (onLoadListener != null) {           onLoadListener.onLoad();         }       }     }   }   @Override   public void onScroll(AbsListView absListView, int i, int i1, int i2) {     this.firstVisibleItem = i;     if (getLastVisiblePosition() == (i2 - 1)) {       isScrollToBottom = true;     } else {       isScrollToBottom = false;     }   }   @Override   public boolean onTouchEvent(MotionEvent ev) {     switch (ev.getAction()) { //       case MotionEvent.ACTION_DOWN:         startY = (int) ev.getY();         break;       case MotionEvent.ACTION_MOVE:         int moveY = (int) ev.getY();         // 移动中的y - 按下的y = 间距.         int diff = (moveY - startY) / 2;         // -头布局的高度 + 间距 = paddingTop         int paddingTop = -headerContentHeight + diff;         // 如果: -头布局的高度 > paddingTop的值 执行super.onTouchEvent(ev);         if (firstVisibleItem == 0             && -headerContentHeight < paddingTop) {           if (paddingTop > 0 && state == NONE) { // 完全显示了.             Log.i(TAG, "松开刷新");             state = PULL;             refreshHeaderViewByState();           } else if (paddingTop < 0               && state == PULL) { // 没有显示完全             Log.i(TAG, "下拉刷新");             state = NONE;             refreshHeaderViewByState();           }           // 下拉头布局           header.setPadding(0, paddingTop, 0, 0);         }         break;       case MotionEvent.ACTION_UP:         // 判断当前的状态是松开刷新还是下拉刷新         if (state == PULL) {           Log.i(TAG, "刷新数据.");           // 把头布局设置为完全显示状态           header.setPadding(0, 0, 0, 0);           // 进入到正在刷新中状态           state = REFRESHING;           refreshHeaderViewByState();           if (onRefreshListener != null) {             onRefreshListener.onRefresh(); // 调用使用者的监听方法           }         } else if (state == NONE) {           // 隐藏头布局           header.setPadding(0, -headerContentHeight, 0, 0);         }         break;       default:         break;     }     return super.onTouchEvent(ev);   } //   private void refreshHeaderViewByState() {     switch (state) { //       case NONE: // 下拉刷新状态         tvState.setText("下拉刷新");         iv_pull.startAnimation(downAnimation); // 执行向下旋转         break;       case PULL: // 松开刷新状态         tvState.setText("松开刷新");         iv_pull.startAnimation(upAnimation); // 执行向上旋转         break;       case REFRESHING: // 正在刷新中状态         iv_pull.clearAnimation();         iv_pull.setVisibility(View.GONE);         mProgressBar.setVisibility(View.VISIBLE);         tvState.setText("正在刷新中...");         break;       default:         break;     }   }   public void hideHeaderView() {     header.setPadding(0, -headerContentHeight, 0, 0);     iv_pull.setVisibility(View.VISIBLE);     mProgressBar.setVisibility(View.GONE);     tvState.setText("下拉刷新");     tvLastUpdateTime.setText("最后刷新时间: " + getLastUpdateTime());     state = NONE;   }   public void hideFooterView() {     footer.setPadding(0, -footerViewHeight, 0, 0);     isLoadingMore = false;   }   public void setOnRefreshListener(OnRefreshListener onRefreshListener) {     this.onRefreshListener = onRefreshListener;   }   public void setOnLoadListener(OnLoadListener onLoadListener) {     this.onLoadListener = onLoadListener;   }   public void onRefresh() {     if (onRefreshListener != null) {       onRefreshListener.onRefresh();     }   }   public void onLoad() {     if (onLoadListener != null) {       onLoadListener.onLoad();     }   }   public interface OnRefreshListener {//定义下拉刷新接口     public void onRefresh();   }   public interface OnLoadListener {//定义上拉加载更多     public void onLoad();   } } 

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"   android:layout_width="match_parent"   android:layout_height="wrap_content">   <TextView     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:text="加载更多"     android:textSize="20dp"     android:padding="10dp"     android:layout_centerHorizontal="true"/> </RelativeLayout> 

<?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="horizontal">   <FrameLayout     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:layout_margin="10dip" >     <ImageView       android:id="@+id/iv_pull"       android:layout_width="wrap_content"       android:layout_height="wrap_content"       android:layout_gravity="center"       android:minWidth="30dip"       android:src="@mipmap/xlistview_arrow" />     <ProgressBar       android:id="@+id/pb_listview_header"       android:layout_width="wrap_content"       android:layout_height="wrap_content"       android:layout_gravity="center"       android:visibility="gone" />   </FrameLayout>   <LinearLayout     android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:layout_gravity="center_vertical"     android:gravity="center_horizontal"     android:orientation="vertical" >     <TextView       android:id="@+id/tv_listview_header_state"       android:layout_width="wrap_content"       android:layout_height="wrap_content"       android:text="下拉刷新"       android:textColor="#FF0000"       android:textSize="18sp" />     <TextView       android:id="@+id/tv_listview_header_last_update_time"       android:layout_width="wrap_content"       android:layout_height="wrap_content"       android:layout_marginTop="5dip"       android:text="最后刷新时间: 2014-10-10 12:56:12"       android:textColor="@android:color/black"       android:textSize="14sp" />   </LinearLayout> </LinearLayout> 

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"   xmlns:tools="http://schemas.android.com/tools"   android:id="@+id/activity_main"   android:layout_width="match_parent"   android:layout_height="match_parent"   android:paddingBottom="@dimen/activity_vertical_margin"   android:paddingLeft="@dimen/activity_horizontal_margin"   android:paddingRight="@dimen/activity_horizontal_margin"  android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.example.mic.testdemo.MainActivity">       <com.example.mic.testdemo.view.AutoListView         android:id="@+id/lv"         android:layout_width="match_parent"        android:layout_height="match_parent">       </com.example.mic.testdemo.view.AutoListView> </RelativeLayout> 

public class MainActivity extends AppCompatActivity implements AutoListView.OnLoadListener,AutoListView.OnRefreshListener {   private TextView textView;   private String result;   private AutoListView listView;   private MyAdater adater;   @Override   protected void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.activity_main);     listView = (AutoListView) findViewById(R.id.lv);} listView.setOnRefreshListener(MainActivity.this); listView.setOnLoadListener(MainActivity.this); @Override   public void onLoad() {   }   @Override   public void onRefresh() {}