仿新浪微博的ListView下拉更新功能

           由於最近做的項目中也用到了這個功能，今天剛好實現了下，就趁現在有時間寫篇部落格分享下。在做的時候也參考了下別人的代碼，畢竟站在巨人的肩膀上才會是自己更加強大。哈哈！先看看新浪的下拉更新是什麼樣的吧！

       

      OK，今天我們要實現的就是上面的下拉重新整理功能。

      首先實現下拉重新整理的布局檔案 layout/head.xml

<?xml version="1.0" encoding="utf-8"?><!-- ListView的頭部 --><LinearLayout  xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="fill_parent"  android:layout_height="wrap_content"  android:background="#ffffff" >    <!-- 內容 -->  <RelativeLayout  android:layout_width="fill_parent"  android:layout_height="wrap_content"  android:id="@+id/head_contentLayout"  android:paddingLeft="30dp"  >    <!-- 箭頭映像、進度條 -->  <FrameLayout  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:layout_alignParentLeft="true"  android:layout_centerVertical="true"  >    <!-- 箭頭 -->  <ImageView  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:layout_gravity="center"  android:src="@drawable/arrow_down"  android:id="@+id/head_arrowImageView"  />    <!-- 進度條 -->  <ProgressBar  android:layout_width="wrap_content"  android:layout_height="wrap_content"  style="?android:attr/progressBarStyleSmall"  android:layout_gravity="center"  android:id="@+id/head_progressBar"    android:visibility="gone"  />    </FrameLayout>    <!-- 提示、最新動向 -->  <LinearLayout  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:layout_centerHorizontal="true"  android:orientation="vertical"  android:gravity="center_horizontal"  >    <!-- 提示 -->  <TextView  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:text="下拉重新整理"  android:textSize="15dp"  android:id="@+id/head_tipsTextView"  />    <!-- 最新動向 -->  <TextView  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:id="@+id/head_lastUpdatedTextView"  android:text="上次更新"  android:textSize="12dp"  />    </LinearLayout>      </RelativeLayout>    </LinearLayout>

        然後設定item的布局模板item.xml：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:gravity="center_vertical"    android:background="#ffffff"    android:orientation="horizontal" >    <ImageView        android:id="@+id/imageView_item"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_marginLeft="10dp"        android:src="@drawable/ic_launcher" />    <TextView        android:id="@+id/textView_item"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_marginLeft="10dp"        android:text="TextView" /></LinearLayout>

     接下來是main.xml布局：

 

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >        <cn.com.karl.list.MyListView    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:id="@+id/listView"    />    </LinearLayout>

   這裡的MyListView是我們自訂的ListView，因為頂部的下拉重新整理系統的ListView不能夠實現，所以我們需要自訂ListView。

   布局檔案搞定，下面看下自訂的MyListView：

package cn.com.karl.list;import java.text.SimpleDateFormat;import java.util.Date;import android.content.Context;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.LinearInterpolator;import android.view.animation.RotateAnimation;import android.widget.AbsListView;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.LinearLayout;import android.widget.ListView;import android.widget.AbsListView.OnScrollListener;import android.widget.ProgressBar;import android.widget.TextView;public class MyListView extends ListView implements OnScrollListener {private static final String TAG = "listview";private final static int RELEASE_To_REFRESH = 0;private final static int PULL_To_REFRESH = 1;private final static int REFRESHING = 2;private final static int DONE = 3;private final static int LOADING = 4;// 實際的padding的距離與介面上位移距離的比例private final static int RATIO = 3;private LayoutInflater inflater;private LinearLayout headView;private TextView tipsTextview;private TextView lastUpdatedTextView;private ImageView arrowImageView;private ProgressBar progressBar;private RotateAnimation animation;private RotateAnimation reverseAnimation;// 用於保證startY的值在一個完整的touch事件中只被記錄一次private boolean isRecored;private int headContentWidth;private int headContentHeight;private int startY;private int firstItemIndex;private int state;private boolean isBack;private OnRefreshListener refreshListener;private boolean isRefreshable;public MyListView(Context context) {super(context);init(context);}public MyListView(Context context, AttributeSet attrs) {super(context, attrs);init(context);}private void init(Context context) {//setCacheColorHint(context.getResources().getColor(R.color.transparent));inflater = LayoutInflater.from(context);headView = (LinearLayout) inflater.inflate(R.layout.head, null);arrowImageView = (ImageView) headView.findViewById(R.id.head_arrowImageView);arrowImageView.setMinimumWidth(70);arrowImageView.setMinimumHeight(50);progressBar = (ProgressBar) headView.findViewById(R.id.head_progressBar);tipsTextview = (TextView) headView.findViewById(R.id.head_tipsTextView);lastUpdatedTextView = (TextView) headView.findViewById(R.id.head_lastUpdatedTextView);measureView(headView);headContentHeight = headView.getMeasuredHeight();headContentWidth = headView.getMeasuredWidth();headView.setPadding(0, -1 * headContentHeight, 0, 0);headView.invalidate();Log.v("size", "width:" + headContentWidth + " height:"+ headContentHeight);addHeaderView(headView, null, false);setOnScrollListener(this);animation = new RotateAnimation(0, -180,RotateAnimation.RELATIVE_TO_SELF, 0.5f,RotateAnimation.RELATIVE_TO_SELF, 0.5f);animation.setInterpolator(new LinearInterpolator());animation.setDuration(250);animation.setFillAfter(true);reverseAnimation = new RotateAnimation(-180, 0,RotateAnimation.RELATIVE_TO_SELF, 0.5f,RotateAnimation.RELATIVE_TO_SELF, 0.5f);reverseAnimation.setInterpolator(new LinearInterpolator());reverseAnimation.setDuration(200);reverseAnimation.setFillAfter(true);state = DONE;isRefreshable = false;}public void onScroll(AbsListView arg0, int firstVisiableItem, int arg2,int arg3) {firstItemIndex = firstVisiableItem;}public void onScrollStateChanged(AbsListView arg0, int arg1) {}public boolean onTouchEvent(MotionEvent event) {if (isRefreshable) {switch (event.getAction()) {case MotionEvent.ACTION_DOWN:if (firstItemIndex == 0 && !isRecored) {isRecored = true;startY = (int) event.getY();Log.v(TAG, "在down時候記錄當前位置‘");}break;case MotionEvent.ACTION_UP:if (state != REFRESHING && state != LOADING) {if (state == DONE) {// 什麼都不做}if (state == PULL_To_REFRESH) {state = DONE;changeHeaderViewByState();Log.v(TAG, "由下拉重新整理狀態，到done狀態");}if (state == RELEASE_To_REFRESH) {state = REFRESHING;changeHeaderViewByState();onRefresh();Log.v(TAG, "由鬆開重新整理狀態，到done狀態");}}isRecored = false;isBack = false;break;case MotionEvent.ACTION_MOVE:int tempY = (int) event.getY();if (!isRecored && firstItemIndex == 0) {Log.v(TAG, "在move時候記錄下位置");isRecored = true;startY = tempY;}if (state != REFRESHING && isRecored && state != LOADING) {// 保證在設定padding的過程中，當前的位置一直是在head，否則如果當列表超出螢幕的話，當在上推的時候，列表會同時進行滾動// 可以鬆手去重新整理了if (state == RELEASE_To_REFRESH) {setSelection(0);// 往上推了，推到了螢幕足夠掩蓋head的程度，但是還沒有推到全部掩蓋的地步if (((tempY - startY) / RATIO < headContentHeight)&& (tempY - startY) > 0) {state = PULL_To_REFRESH;changeHeaderViewByState();Log.v(TAG, "由鬆開重新整理狀態轉變到下拉重新整理狀態");}// 一下子推到頂了else if (tempY - startY <= 0) {state = DONE;changeHeaderViewByState();Log.v(TAG, "由鬆開重新整理狀態轉變到done狀態");}// 往下拉了，或者還沒有上推到螢幕頂部掩蓋head的地步else {// 不用進行特別的操作，只用更新paddingTop的值就行了}}// 還沒有到達顯示鬆開重新整理的時候,DONE或者是PULL_To_REFRESH狀態if (state == PULL_To_REFRESH) {setSelection(0);// 下拉到可以進入RELEASE_TO_REFRESH的狀態if ((tempY - startY) / RATIO >= headContentHeight) {state = RELEASE_To_REFRESH;isBack = true;changeHeaderViewByState();Log.v(TAG, "由done或者下拉重新整理狀態轉變到鬆開重新整理");}// 上推到頂了else if (tempY - startY <= 0) {state = DONE;changeHeaderViewByState();Log.v(TAG, "由DOne或者下拉重新整理狀態轉變到done狀態");}}// done狀態下if (state == DONE) {if (tempY - startY > 0) {state = PULL_To_REFRESH;changeHeaderViewByState();}}// 更新headView的sizeif (state == PULL_To_REFRESH) {headView.setPadding(0, -1 * headContentHeight+ (tempY - startY) / RATIO, 0, 0);}// 更新headView的paddingTopif (state == RELEASE_To_REFRESH) {headView.setPadding(0, (tempY - startY) / RATIO- headContentHeight, 0, 0);}}break;}}return super.onTouchEvent(event);}// 當狀態改變時候，調用該方法，以更新介面private void changeHeaderViewByState() {switch (state) {case RELEASE_To_REFRESH:arrowImageView.setVisibility(View.VISIBLE);progressBar.setVisibility(View.GONE);tipsTextview.setVisibility(View.VISIBLE);lastUpdatedTextView.setVisibility(View.VISIBLE);arrowImageView.clearAnimation();arrowImageView.startAnimation(animation);tipsTextview.setText("鬆開重新整理");Log.v(TAG, "目前狀態，鬆開重新整理");break;case PULL_To_REFRESH:progressBar.setVisibility(View.GONE);tipsTextview.setVisibility(View.VISIBLE);lastUpdatedTextView.setVisibility(View.VISIBLE);arrowImageView.clearAnimation();arrowImageView.setVisibility(View.VISIBLE);// 是由RELEASE_To_REFRESH狀態轉變來的if (isBack) {isBack = false;arrowImageView.clearAnimation();arrowImageView.startAnimation(reverseAnimation);tipsTextview.setText("下拉重新整理");} else {tipsTextview.setText("下拉重新整理");}Log.v(TAG, "目前狀態，下拉重新整理");break;case REFRESHING:headView.setPadding(0, 0, 0, 0);progressBar.setVisibility(View.VISIBLE);arrowImageView.clearAnimation();arrowImageView.setVisibility(View.GONE);tipsTextview.setText("正在重新整理...");lastUpdatedTextView.setVisibility(View.VISIBLE);Log.v(TAG, "目前狀態,正在重新整理...");break;case DONE:headView.setPadding(0, -1 * headContentHeight, 0, 0);progressBar.setVisibility(View.GONE);arrowImageView.clearAnimation();arrowImageView.setImageResource(R.drawable.arrow_down);tipsTextview.setText("下拉重新整理");lastUpdatedTextView.setVisibility(View.VISIBLE);Log.v(TAG, "目前狀態，done");break;}}public void setonRefreshListener(OnRefreshListener refreshListener) {this.refreshListener = refreshListener;isRefreshable = true;}public interface OnRefreshListener {public void onRefresh();}public void onRefreshComplete() {state = DONE;SimpleDateFormat format=new SimpleDateFormat("yyyy年MM月dd日  HH:mm");String date=format.format(new Date());lastUpdatedTextView.setText("最新動向:" + date);changeHeaderViewByState();}private void onRefresh() {if (refreshListener != null) {refreshListener.onRefresh();}}// 此方法直接照搬自網路上的一個下拉重新整理的demo，此處是“估計”headView的width以及heightprivate void measureView(View child) { ViewGroup.LayoutParams p = child.getLayoutParams();        if (p == null) {            p = new ViewGroup.LayoutParams(                    ViewGroup.LayoutParams.FILL_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);        } else {            childHeightSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);        }        child.measure(childWidthSpec, childHeightSpec);}public void setAdapter(BaseAdapter adapter) {SimpleDateFormat format=new SimpleDateFormat("yyyy年MM月dd日  HH:mm");String date=format.format(new Date());lastUpdatedTextView.setText("最新動向:" + date);super.setAdapter(adapter);}}

最後在MainActivity中新增內容：

public class MainActivity extends Activity {private LinkedList<String> data;private BaseAdapter adapter;public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);data = new LinkedList<String>();    for(int i=0;i<10;i++){    data.add(String.valueOf(i));    }final MyListView listView = (MyListView) findViewById(R.id.listView);adapter = new BaseAdapter() {public View getView(int position, View convertView, ViewGroup parent) { convertView=LayoutInflater.from(getApplicationContext()).inflate(R.layout.item, null);TextView textView = (TextView) convertView.findViewById(R.id.textView_item);textView.setText(data.get(position));return convertView;}public long getItemId(int position) {return position;}public Object getItem(int position) {return data.get(position);}public int getCount() {return data.size();}};listView.setAdapter(adapter);listView.setonRefreshListener(new OnRefreshListener() {public void onRefresh() {new AsyncTask<Void, Void, Void>() {protected Void doInBackground(Void... params) {try {Thread.sleep(1000);} catch (Exception e) {e.printStackTrace();}data.addFirst("重新整理後的內容");return null;}@Overrideprotected void onPostExecute(Void result) {adapter.notifyDataSetChanged();listView.onRefreshComplete();}}.execute(null);}});}}

    運行效果：

  

    源碼：仿新浪微博的ListView下拉更新功能