在实际开发中我们经常要用到上拉刷新和下拉刷新，因此今天我写了一个上拉和下拉刷新的demo，有一个自定义的下拉刷新控件
只需要在布局文件中直接引用就可以使用，非常方便，非常使用，以下是源代码；
自定义的ListView RTPullListView
package com.ryantang.pulllistview; 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.AbsListView.OnScrollListener;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView; public class RTPullListView extends ListView implements OnScrollListener {
private static final String TAG = "RTPullListView"; 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; // 实际的padding的距离与界面上偏移距离的比例
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; // 用于保证startY的值在一个完整的touch事件中只被记录一次
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;
private boolean isPush; private int visibleLastIndex;
private int visibleItemCount; public RTPullListView(Context context) {
super(context);
init(context);
} public RTPullListView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
} private void init(Context context) {
inflater = LayoutInflater.from(context);
headView = (LinearLayout) inflater.inflate(R.layout.pulllist_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(); 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;
isPush = true;
} public void onScroll(AbsListView arg0, int firstVisiableItem, int arg2,
int arg3) {
firstItemIndex = firstVisiableItem;
visibleLastIndex = firstVisiableItem + arg2 - 1;
visibleItemCount = arg2;
if(firstItemIndex == 1 && !isPush){
setSelection(0);
}
} public void setSelectionfoot(){
this.setSelection(visibleLastIndex - visibleItemCount + 1);
} public void onScrollStateChanged(AbsListView arg0, int arg1) { }
@Override
public boolean onTouchEvent(MotionEvent event) { if (isRefreshable) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
if (firstItemIndex == 0 && !isRecored) {
isRecored = true;
isPush = true;
startY = (int) event.getY();
Log.v(TAG, "在down时候记录当前位置‘");
}
break;
case MotionEvent.ACTION_UP:
if (state != REFRESHING && state != LOADING) {
if (state == DONE) {
// 什么都不做
}
if (state == PULL_To_REFRESH) {
state = DONE;
changeHeaderViewByState(); Log.v(TAG, "由下拉刷新状态，到done状态");
}
if (state == RELEASE_To_REFRESH) {
state = REFRESHING;
changeHeaderViewByState();
onRefresh(); Log.v(TAG, "由松开刷新状态，到done状态");
}
} isRecored = false;
isBack = false; break; case MotionEvent.ACTION_MOVE:
int tempY = (int) event.getY(); if (!isRecored && firstItemIndex == 0) {
Log.v(TAG, "在move时候记录下位置");
isRecored = true;
startY = tempY;
} if (state != REFRESHING && isRecored && state != LOADING) { // 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 (state == 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 < headContentHeight)
&& (tempY - startY) > 0) {
state = PULL_To_REFRESH;
changeHeaderViewByState(); Log.v(TAG, "由松开刷新状态转变到下拉刷新状态");
}
// 一下子推到顶了
else if (tempY - startY <= 0) {
state = DONE;
changeHeaderViewByState(); Log.v(TAG, "由松开刷新状态转变到done状态");
}
// 往下拉了，或者还没有上推到屏幕顶部掩盖head的地步
else {
// 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 (state == PULL_To_REFRESH) { setSelection(0); // 下拉到可以进入RELEASE_TO_REFRESH的状态
if ((tempY - startY) / RATIO >= headContentHeight) {
state = 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");
}
// 上推到顶了
else if (tempY - startY <= 0) {
state = DONE;
changeHeaderViewByState();
isPush = false;
Log.v(TAG, "由DOne或者下拉刷新状态转变到done状态");
}
} // done状态下
if (state == DONE) {
if (tempY - startY > 0) {
state = PULL_To_REFRESH;
changeHeaderViewByState();
}
} // 更新headView的size
if (state == PULL_To_REFRESH) {
headView.setPadding(0, -1 * headContentHeight
+ (tempY - startY) / RATIO, 0, 0); } // 更新headView的paddingTop
if (state == RELEASE_To_REFRESH) {
headView.setPadding(0, (tempY - startY) / RATIO
- headContentHeight, 0, 0);
} } 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 (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(getResources().getString(R.string.release_to_refresh)); Log.v(TAG, "当前状态，松开刷新");
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状态转变来的
if (isBack) {
isBack = false;
arrowImageView.clearAnimation();
arrowImageView.startAnimation(reverseAnimation); tipsTextview.setText(getResources().getString(R.string.pull_to_refresh));
} else {
tipsTextview.setText(getResources().getString(R.string.pull_to_refresh));
}
Log.v(TAG, "当前状态，下拉刷新");
break; case REFRESHING: headView.setPadding(0, 0, 0, 0); progressBar.setVisibility(View.VISIBLE);
arrowImageView.clearAnimation();
arrowImageView.setVisibility(View.GONE);
tipsTextview.setText(getResources().getString(R.string.refreshing));
lastUpdatedTextView.setVisibility(View.VISIBLE); Log.v(TAG, "当前状态,正在刷新...");
break;
case DONE:
headView.setPadding(0, -1 * headContentHeight, 0, 0); progressBar.setVisibility(View.GONE);
arrowImageView.clearAnimation();
arrowImageView.setImageResource(R.drawable.pulltorefresh);
tipsTextview.setText(getResources().getString(R.string.pull_to_refresh));
lastUpdatedTextView.setVisibility(View.VISIBLE); Log.v(TAG, "当前状态，done");
break;
}
} public void setonRefreshListener(OnRefreshListener refreshListener) {
this.refreshListener = refreshListener;
isRefreshable = true;
} public interface OnRefreshListener {
public void onRefresh();
} public void onRefreshComplete() {
state = DONE;
lastUpdatedTextView.setText(getResources().getString(R.string.updating) + new Date().toLocaleString());
changeHeaderViewByState();
invalidateViews();
setSelection(0);
} private void onRefresh() {
if (refreshListener != null) {
refreshListener.onRefresh();
}
} public void clickToRefresh(){
state = REFRESHING;
changeHeaderViewByState();
} // 此方法直接照搬自网络上的一个下拉刷新的demo，此处是“估计”headView的width以及height
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);
} public void setAdapter(BaseAdapter adapter) {
lastUpdatedTextView.setText(getResources().getString(R.string.updating) + new Date().toLocaleString());
super.setAdapter(adapter);
}
}
以上就是有下拉和上拉刷新功能的自定义的listview，下拉刷新头和上拉刷新的底部样式都可以自定义
这里给出我的下拉头布局和上拉底部布局，你们可以在此基础上进行修改自定义；
pulllist_head.xml 头布局
<?xml version="1.0" encoding="utf-8"?>
<!-- ListView的头部 -->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:paddingTop="5dp"
android:paddingBottom="5dp"
android:background="#FFFFFFFF" > <!-- 内容 --> <RelativeLayout
android:id="@+id/head_contentLayout"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:layout_marginBottom="10dp"
android:paddingLeft="10dp" > <!-- 箭头图像、进度条 --> <FrameLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true" > <!-- 箭头 --> <ImageView
android:id="@+id/head_arrowImageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:src="@drawable/pulltorefresh" /> <!-- 进度条 --> <ProgressBar
android:id="@+id/head_progressBar"
style="@android:style/Widget.ProgressBar.Small"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:visibility="gone" />
</FrameLayout> <!-- 提示、最近更新 --> <LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:gravity="center_horizontal"
android:orientation="vertical" > <!-- 提示 --> <TextView
android:id="@+id/head_tipsTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="16sp" /> <!-- 最近更新 --> <TextView
android:id="@+id/head_lastUpdatedTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="13sp" />
</LinearLayout>
</RelativeLayout> </LinearLayout>
底部布局：list_footview.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/list_footview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@android:color/white"
android:orientation="vertical" > <LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:layout_centerVertical="true"
android:layout_marginBottom="25dp"
android:layout_marginTop="25dp"
android:gravity="center"
android:orientation="horizontal" > <TextView
android:id="@+id/text_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:text="获取更多"
android:textColor="@android:color/black"
android:textSize="16sp" /> <ProgressBar
android:id="@+id/footer_progress"
style="?android:attr/progressBarStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="3dp"
android:visibility="gone" />
</LinearLayout> </RelativeLayout>
ok这样一个自定义的下拉上拉刷新的listview就定义好了，可以在activity的布局文件中直接引用，并且像操纵listview那样使用
非常方便，这里也给出我使用的源码；
首先是主界面布局：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" > <com.ryantang.pulllistview.RTPullListView
android:id="@+id/pullListView"
android:layout_width="fill_parent"
android:layout_height="wrap_content" /> </LinearLayout>
主界面activity中使用源码：
package com.ryantang.pulllistview; import java.util.ArrayList;
import java.util.List; import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.ProgressBar;
import android.widget.RelativeLayout; import com.ryantang.pulllistview.RTPullListView.OnRefreshListener; /**
* PullListView
* @author Ryan
*
*/
public class RTPullListViewActivity extends Activity {
private static final int INTERNET_FAILURE = -1;
private static final int LOAD_SUCCESS = 1;
private static final int LOAD_MORE_SUCCESS = 3;
private static final int NO_MORE_INFO = 4;
private static final int LOAD_NEW_INFO = 5;
private RTPullListView pullListView;
private ProgressBar moreProgressBar;
private List<String> dataList;
private ArrayAdapter<String> adapter; @Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
pullListView = (RTPullListView) this.findViewById(R.id.pullListView); dataList = new ArrayList<String>();
for (int i = 0; i < 5; i++) {
dataList.add("Item data "+i);
}
adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, dataList);
pullListView.setAdapter(adapter); //添加listview底部获取更多按钮（可自定义）
LayoutInflater inflater = LayoutInflater.from(this);
View view = inflater.inflate(R.layout.list_footview, null);
RelativeLayout footerView =(RelativeLayout) view.findViewById(R.id.list_footview);
moreProgressBar = (ProgressBar) view.findViewById(R.id.footer_progress);
pullListView.addFooterView(footerView); //下拉刷新监听器
pullListView.setonRefreshListener(new OnRefreshListener() { @Override
public void onRefresh() {
new Thread(new Runnable() { @Override
public void run() {
try {
Thread.sleep(2000);
dataList.clear();
for (int i = 0; i < 5; i++) {
dataList.add("Item data "+i);
}
myHandler.sendEmptyMessage(LOAD_NEW_INFO);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}).start();
}
}); //获取跟多监听器
footerView.setOnClickListener(new OnClickListener() {// @Override
public void onClick(View v) { moreProgressBar.setVisibility(View.VISIBLE); new Thread(new Runnable() { @Override
public void run() {
try {
Thread.sleep(2000);
for (int i = 0; i < 5; i++) {
dataList.add("New item data "+i);
}
myHandler.sendEmptyMessage(LOAD_MORE_SUCCESS);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}).start();
}
});
} //结果处理
private Handler myHandler = new Handler(){ @Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what) {
case LOAD_MORE_SUCCESS:
moreProgressBar.setVisibility(View.GONE);
adapter.notifyDataSetChanged();
pullListView.setSelectionfoot();
break; case LOAD_NEW_INFO:
adapter.notifyDataSetChanged();
pullListView.onRefreshComplete();
break;
default:
break;
}
} };
}
效果图如下：