最近因为公司的项目，做了一个关于ListView下拉刷新的demo，供大家学习参考，有好的建议也希望提供给我。下面为demo的详细：
呈现主界面的Activity：
public class MyActivity extends Activity implements PullToRefreshListView.OnRefreshListener{
private static final String TAG = "PullToRefreshListView";
private PullToRefreshListView pullToRefreshListView;
private ArrayList<HashMap<String,String>> list;
private HashMap<String,String> map;
private MainAdapter mainAdapter;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Log.v(TAG, "onCreate");
setData();
pullToRefreshListView = (PullToRefreshListView)findViewById(R.id.bodyList);
mainAdapter = new MainAdapter(MyActivity.this,list);
pullToRefreshListView.setOnRefreshListener(this); //设置刷新监听
pullToRefreshListView.setAdapter(mainAdapter);
}
private void setData(){
list = new ArrayList<HashMap<String, String>>();
map = new HashMap<String, String>();
map.put("test1","test1");
list.add(map);
}
@Override
public Object refreshing() {
setData();
return null;
}
}
封装数据的Adapter：
public class MainAdapter extends BaseAdapter {
private ArrayList<HashMap<String,String>> list;
private Context context;
private LayoutInflater myInflater;
public MainAdapter(Context context,ArrayList<HashMap<String,String>> list){
this.context = context;
this.list = list;
this.myInflater = LayoutInflater.from(this.context);
}
@Override
public int getCount() {
return list.size();
}
@Override
public Object getItem(int i) {
return this.list.get(i);
}
@Override
public long getItemId(int i) {
return i;
}
@Override
public View getView(int i, View view, ViewGroup viewGroup) {
HolderView holderView = null;
if (view == null){
holderView = new HolderView();
view = this.myInflater.inflate(R.layout.main_item,null);
holderView.textView = (TextView)view.findViewById(R.id.main_item);
view.setTag(holderView);
} else {
holderView = (HolderView)view.getTag();
}
holderView.textView.setText(list.get(i).get("test1"));
return view;
}
class HolderView{
TextView textView;
}
}
自定义下拉刷新的ListView：
public class PullToRefreshListView extends ListView implements OnScrollListener {
private static final String TAG = "PullToRefreshListView";
private final static int RELEASE_To_REFRESH = 0;// 松手刷新状态
private final static int PULL_To_REFRESH = 1;// 下拉刷新状态
private final static int REFRESHING = 2;// 刷新中的状态
private final static int DONE = 3;// 正常状态
private int mPullRefreshState;// 记录下拉刷新状态
// 实际的padding的距离与界面上偏移距离的比例
private final static int RATIO = 2;
// HeadView控件
private LayoutInflater inflater;
private LinearLayout mHeaderLayout;
private TextView tipTextView;
private TextView lastUpdatedTextView;
private ImageView arrowImageView;
private ProgressBar progressBar;
// HeadView箭头动画
private RotateAnimation animation;
private RotateAnimation reverseAnimation;
private boolean isRecored;// 用于保证startY的值在一个完整的touch事件中只被记录一次
private boolean isBack;
private int mHeaderHight;
private int startY;
private int firstVisiableItem;// 位于ListView第一行的Item的Index
// 定义接口
public interface OnRefreshListener {
Object refreshing(); // 加载数据
}
// 注入接口
private OnRefreshListener mRefreshListener = null;
public void setOnRefreshListener(OnRefreshListener mRefreshListener) {
this.mRefreshListener = mRefreshListener;
}
public PullToRefreshListView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
// 初始化ListView
private void init(Context context) {
inflater = LayoutInflater.from(context);
mHeaderLayout = (LinearLayout) inflater.inflate(
R.layout.pull_to_refresh_header, null);
arrowImageView = (ImageView) mHeaderLayout
.findViewById(R.id.head_imageView);
arrowImageView.setMinimumWidth(70);
arrowImageView.setMinimumHeight(50);
progressBar = (ProgressBar) mHeaderLayout
.findViewById(R.id.head_progressBar);
tipTextView = (TextView) mHeaderLayout
.findViewById(R.id.head_tipTextView);
lastUpdatedTextView = (TextView) mHeaderLayout
.findViewById(R.id.head_lastUpdateTextView);
measureView(mHeaderLayout);
mHeaderHight = mHeaderLayout.getMeasuredHeight();
// 初始隐藏HeadView
mHeaderLayout.setPadding(0, -1 * mHeaderHight, 0, 0);
mHeaderLayout.invalidate();
addHeaderView(mHeaderLayout, 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);
mPullRefreshState = DONE;
}
/**
* 因为是在构造函数里测量高度，应该先measure一下
*
* @param child
*/
private 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);
}
@Override
public void onScroll(AbsListView view, int firstVisiableItem,
int visibleItemCount, int totalItemCount) {
this.firstVisiableItem = firstVisiableItem;
}
/**
* ListView的scrollState有3种值:SCROLL_STATE_IDLE, SCROLL_STATE_TOUCH_SCROLL,
* SCROLL_STATE_FLING, 而我们要下拉的触发条件是SCROLL_STATE_TOUCH_SCROLL。
*/
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
// TODO Auto-generated method stub
}
@Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
if (firstVisiableItem == 0 && !isRecored) {
isRecored = true;
startY = (int) event.getY();
}
break;
case MotionEvent.ACTION_MOVE:
int tempY = (int) event.getY();
if (!isRecored && firstVisiableItem == 0) {
isRecored = true;
startY = tempY;
}
if (mPullRefreshState != REFRESHING && isRecored) {
// 保证在设置padding的过程中，当前的位置一直是在head，否则如果当列表超出屏幕的话，当在上推的时候，列表会同时进行滚动
// 可以松手去刷新了
if (mPullRefreshState == RELEASE_To_REFRESH) {
setSelection(0);
// 往上推了，推到了屏幕足够掩盖head的程度，但是还没有推到全部掩盖的地步
if (((tempY - startY) / RATIO < mHeaderHight)
&& (tempY - startY) > 0) {
mPullRefreshState = PULL_To_REFRESH;
changeHeaderViewByState();
Log.v(TAG, "由松开刷新状态转变到下拉刷新状态");
} else if (tempY - startY <= 0) {// 一下子推到顶了
mPullRefreshState = DONE;
changeHeaderViewByState();
Log.v(TAG, "由松开刷新状态转变到Done状态");
} else {// 往下拉了，或者还没有上推到屏幕顶部掩盖head的地步
// 不用进行特别的操作，只用更新paddingTop的值就行了
}
}
// 还没有到达显示松开刷新的时候,DONE或者是PULL_To_REFRESH状态
if (mPullRefreshState == PULL_To_REFRESH) {
setSelection(0);
// 下拉到可以进入松开U刷新的状态
if ((tempY - startY) / RATIO >= mHeaderHight) {
mPullRefreshState = RELEASE_To_REFRESH;
isBack = true;
changeHeaderViewByState();
Log.v(TAG, "由Done或者下拉刷新状态转变到松开刷新");
}else if (tempY - startY <= 0) {// 上推到顶了
mPullRefreshState = DONE;
changeHeaderViewByState();
Log.v(TAG, "由Done或者下拉刷新状态转变到Done状态");
}
}
// done状态下
if (mPullRefreshState == DONE) {
if (tempY - startY > 0) {
mPullRefreshState = PULL_To_REFRESH;
changeHeaderViewByState();
}
}
// 更新mHeaderLayout的size
if (mPullRefreshState == PULL_To_REFRESH) {
mHeaderLayout.setPadding(0, -1 * mHeaderHight + (tempY - startY) / RATIO, 0, 0);
// mHeaderLayout.setPadding(0, (tempY - startY) / RATIO, 0, 0);
}
// 更新mHeaderLayout的paddingTop
if (mPullRefreshState == RELEASE_To_REFRESH) {
mHeaderLayout.setPadding(0, (tempY - startY) / RATIO - mHeaderHight, 0, 0);
// mHeaderLayout.setPadding(0, (tempY - startY) / RATIO, 0, 0);
}
}
break;
case MotionEvent.ACTION_UP:
if (mPullRefreshState != REFRESHING) {
if (mPullRefreshState == DONE) {
// 正常状态下无需做任何操作
}
if (mPullRefreshState == PULL_To_REFRESH) {
mPullRefreshState = DONE;
changeHeaderViewByState();
Log.v(TAG, "由下拉刷新状态，到Done状态");
}
if (mPullRefreshState == RELEASE_To_REFRESH) {
mPullRefreshState = REFRESHING;
changeHeaderViewByState();
refreshListView();
Log.v(TAG, "由松开刷新状态，到的Done状态");
}
}
isRecored = false;
isBack = false;
break;
}
return super.onTouchEvent(event);
}
// 当状态改变时候，调用该方法，以更新界面
private void changeHeaderViewByState() {
switch (mPullRefreshState) {
case RELEASE_To_REFRESH:
arrowImageView.setVisibility(View.VISIBLE);
progressBar.setVisibility(View.GONE);
tipTextView.setVisibility(View.VISIBLE);
lastUpdatedTextView.setVisibility(View.VISIBLE);
arrowImageView.clearAnimation();
arrowImageView.startAnimation(animation);
tipTextView.setText("松开刷新");
Log.v(TAG, "当前状态，松开刷新");
break;
case PULL_To_REFRESH:
progressBar.setVisibility(View.GONE);
tipTextView.setVisibility(View.VISIBLE);
lastUpdatedTextView.setVisibility(View.VISIBLE);
arrowImageView.clearAnimation();
arrowImageView.setVisibility(View.VISIBLE);
// 是由RELEASE_To_REFRESH状态转变来的
if (isBack) {
isBack = false;
arrowImageView.clearAnimation();
arrowImageView.startAnimation(reverseAnimation);
tipTextView.setText("下拉刷新");
} else {
tipTextView.setText("下拉刷新");
}
Log.v(TAG, "当前状态，下拉刷新");
break;
case REFRESHING:
// mHeaderLayout.setPadding(0, 0, 0, 0);
new Thread() {
public void run() {
while (mHeaderLayout.getPaddingTop() > 1) {
Message msg = hand.obtainMessage();
msg.what = 1;
hand.sendMessage(msg);
try {
sleep(10);// 慢一点反弹，别一下子就弹回去了
} catch (InterruptedException e) {
e.printStackTrace();
}
}
};
}.start();
progressBar.setVisibility(View.VISIBLE);
arrowImageView.clearAnimation();
arrowImageView.setVisibility(View.GONE);
tipTextView.setText("正在刷新...");
lastUpdatedTextView.setVisibility(View.VISIBLE);
Log.v(TAG, "当前状态,正在刷新...");
break;
case DONE:
// mHeaderLayout.setPadding(0, -1 * mHeaderHight, 0, 0);
new Thread() {
public void run() {
while (mHeaderLayout.getPaddingTop() > -1 * mHeaderHight) {
Message msg = hand.obtainMessage();
msg.what = 2;
hand.sendMessage(msg);
try {
sleep(10);// 慢一点反弹，别一下子就弹回去了
} catch (InterruptedException e) {
e.printStackTrace();
}
}
};
}.start();
progressBar.setVisibility(View.GONE);
arrowImageView.clearAnimation();
arrowImageView.setImageResource(R.drawable.refresh_list_pull_down);
tipTextView.setText("下拉刷新");
lastUpdatedTextView.setVisibility(View.VISIBLE);
Log.v(TAG, "当前状态，done");
break;
}
}
private Handler hand = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case 0:
mPullRefreshState = DONE;
lastUpdatedTextView.setText("更新于:"
+ new Date().toLocaleString());
changeHeaderViewByState();
break;
case 1:
mHeaderLayout.setPadding(mHeaderLayout.getPaddingLeft(),
(int) (mHeaderLayout.getPaddingTop() * 0.75f),
mHeaderLayout.getPaddingRight(),
mHeaderLayout.getPaddingBottom());
break;
case 2:
int top;
if (mHeaderLayout.getPaddingTop() >= 0) {
top = (int) (-mHeaderHight * 0.25);
} else {
top = (int) (mHeaderLayout.getPaddingTop() * 1.25f);
}
mHeaderLayout.setPadding(mHeaderLayout.getPaddingLeft(), top,
mHeaderLayout.getPaddingRight(),
mHeaderLayout.getPaddingBottom());
break;
default:
break;
}
};
};
// 更新数据，并刷新列表
private void refreshListView() {
if (mRefreshListener != null) {
new Thread() {
public void run() {
try {
if (mRefreshListener != null) {
Object mRefreshObject = mRefreshListener
.refreshing();
sleep(2000);
Message msg = hand.obtainMessage();
msg.what = 0;
msg.obj = mRefreshObject;
hand.sendMessage(msg);
}
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}// 处理后台加载数据
};
}.start();
}
}
}
以下是布局文件：
main.xml
<?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'>
<include layout="@layout/main_head"/>
<com.yzj.listview.PullToRefreshListView
android:id="@+id/bodyList"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:cacheColorHint="#00000000"
android:fadingEdge="none"
/>
</LinearLayout>
main_head.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="48dp"
android:background="@drawable/title">
<TextView
android:id="@+id/document_title_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="@string/app_name"
android:textSize="20sp"
android:textColor="@android:color/white"
/>
</RelativeLayout>
pull_to_refresh_header.xml
<?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"
android:background="@android:color/white"
android:gravity="center">
<RelativeLayout
android:layout_width="58dp"
android:layout_height="wrap_content"
android:layout_marginLeft="-30dp">
<ImageView
android:id="@+id/head_imageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:contentDescription="@string/app_name"
android:src="@drawable/refresh_list_pull_down"
/>
<ProgressBar
android:id="@+id/head_progressBar"
android:layout_width="28dp"
android:layout_height="28dp"
style="?android:attr/progressBarStyleSmall"
android:layout_centerInParent="true"
android:visibility="gone"
/>
</RelativeLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="58dp"
android:orientation="vertical"
android:gravity="center">
<TextView
android:id="@+id/head_tipTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="下拉刷新"
android:textSize="18sp"
/>
<TextView
android:id="@+id/head_lastUpdateTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="更新于:2013.08.15 14:15"
android:textSize="14sp"
/>
</LinearLayout>
</LinearLayout>
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