下拉刷新-------
1.addHeaderView必须在setAdapter之前调用
2.将paddingTop设置一个headerView高度的负值去隐藏它
getHeight()和getMeasuredHeight()的区别：
getMeasuredHeight():获取测量完的高度，只要在onMeasure方法执行完，就可以用
它获取到宽高，在自定义控件内部多使用这个
使用view.measure(0,0)方法可以主动通知系统去测量，然后就
可以直接使用它获取宽高
getHeight()：必须在onLayout方法执行完后，才能获得宽高
view.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
headerView.getViewTreeObserver().removeGlobalOnLayoutListener(this);
int headerViewHeight = headerView.getHeight();
//直接可以获取宽高
}
});
3.setSelection(position);将对应位置的item放置到屏幕顶端
4. 有时listview在滑动的时候背景会变黑，这是Listview默认的背景色 可以将其默认背景色改成白色的 android:cacheColorHint="#fff"
其中headerView的布局文件
<?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_horizontal"
android:orientation="horizontal" > <RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="10dp"
android:layout_marginTop="10dp" > <ImageView
android:id="@+id/iv_arrow"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/indicator_arrow"
android:contentDescription="@null" /> <ProgressBar
android:id="@+id/pb_rotate"
android:layout_width="30dp"
android:layout_height="30dp"
android:visibility="invisible"
android:layout_centerInParent="true"
android:indeterminateDrawable="@drawable/indeterminate_drawable"
android:indeterminateDuration="2000" />
</RelativeLayout> <LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="10dp"
android:layout_marginLeft="15dp"
android:layout_marginTop="10dp"
android:gravity="center"
android:orientation="vertical" > <TextView
android:id="@+id/tv_state"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="下拉刷新"
android:textColor="#aa000000"
android:textSize="20sp" /> <TextView
android:id="@+id/tv_time"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="最后刷新："
android:textColor="@android:color/darker_gray"
android:textSize="14sp" />
</LinearLayout> </LinearLayout>
其中footerView的布局文件
<?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"
android:orientation="horizontal" > <ProgressBar
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_marginTop="10dp"
android:layout_marginBottom="10dp"
android:indeterminate="true"
android:indeterminateDrawable="@drawable/indeterminate_drawable"
android:indeterminateDuration="1000" /> <TextView android:layout_width="wrap_content"
android:layout_marginTop="10dp"
android:layout_marginBottom="10dp"
android:layout_height="wrap_content"
android:textColor="#aa000000"
android:layout_marginLeft="15dp"
android:textSize="20sp"
android:text="加载更多..."/>
</LinearLayout>
android:indeterminateDrawable="@drawable/indeterminate_drawable"
<?xml version="1.0" encoding="utf-8"?>
<rotate xmlns:android="http://schemas.android.com/apk/res/android"
android:fromDegrees="0"
android:pivotX="50%"
android:pivotY="50%"
android:drawable="@drawable/indicate_rotate"
android:toDegrees="360"> </rotate>
RefreshListView的主代码
package com.demo.pullrefresh.view; import java.text.SimpleDateFormat;
import java.util.Date; import com.demo.pullrefresh.R; import android.annotation.SuppressLint;
import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
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 android.widget.AbsListView.OnScrollListener; public class RefreshListView extends ListView implements OnScrollListener { private View headerView;// headerView
private ImageView iv_arrow;
private ProgressBar pb_rotate;
private TextView tv_state, tv_time; private int downY;// 按下时y的坐标
private int headerViewHeight;// headerView高 private View footerView;
private int footerViewHeight; private final int PULL_REFRESH = 0;// 下拉刷新的状态
private final int RELEASE_REFRESH = 1;// 松开刷新的状态
private final int REFRESHING = 2;// 正在刷新的状态
private int currentState = PULL_REFRESH;// headerView的默认位置 private RotateAnimation upAnimation, downAnimation;
private boolean isLoadingMore = false;// 当前是否正在处于加载更多 public RefreshListView(Context context) {
super(context);
init();
} public RefreshListView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
} private void init() {
setOnScrollListener(this);
initHeaderView();
initFooterView();
initRotateAnimation();
} /**
* 初始化headerView
*/
private void initHeaderView() {
headerView = View.inflate(getContext(), R.layout.layout_header, null);
// headerView
// =LayoutInflater.from(getContext()).inflate(R.layout.layout_header,
// null);
iv_arrow = (ImageView) headerView.findViewById(R.id.iv_arrow);
pb_rotate = (ProgressBar) headerView.findViewById(R.id.pb_rotate);
tv_state = (TextView) headerView.findViewById(R.id.tv_state);
tv_time = (TextView) headerView.findViewById(R.id.tv_time);
// 第一种方法
// headerView.getViewTreeObserver().addOnGlobalLayoutListener(new
// OnGlobalLayoutListener() {
// @Override
// public void onGlobalLayout() {
// headerView.getViewTreeObserver().removeGlobalOnLayoutListener(this);
// int headerViewHeight = headerView.getHeight();
//
//
// Log.e("MainActivity", "headerViewHeight: "+headerViewHeight);
// headerView.setPadding(0, -headerViewHeight, 0, 0);
// refreshListView.addHeaderView(headerView);//
// }
// });
// 第二种方法
headerView.measure(0, 0);// 主动通知系统去测量
headerViewHeight = headerView.getMeasuredHeight();
Log.e("MainActivity", "headerViewHeight: " + headerViewHeight);
headerView.setPadding(0, -headerViewHeight, 0, 0);
addHeaderView(headerView);//
} /**
* 初始化旋转动画
*/
private void initRotateAnimation() {
upAnimation = new RotateAnimation(0, -180,
RotateAnimation.RELATIVE_TO_SELF, 0.5f,
RotateAnimation.RELATIVE_TO_SELF, 0.5f);
upAnimation.setDuration(300);
upAnimation.setFillAfter(true);
downAnimation = new RotateAnimation(-180, -360,
RotateAnimation.RELATIVE_TO_SELF, 0.5f,
RotateAnimation.RELATIVE_TO_SELF, 0.5f);
downAnimation.setDuration(300);
downAnimation.setFillAfter(true);
} /**
* 初始化footerView
*/
private void initFooterView() {
footerView = View.inflate(getContext(), R.layout.layout_footer, null);
footerView.measure(0, 0);// 主动通知系统去测量该View
footerViewHeight = footerView.getMeasuredHeight();
footerView.setPadding(0, -footerViewHeight, 0, 0);
addFooterView(footerView);
} @Override
public boolean onTouchEvent(MotionEvent ev) {
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
downY = (int) ev.getY();
break;
case MotionEvent.ACTION_MOVE: int deltaY = (int) (ev.getY() - downY);
int paddingTop = -headerViewHeight + deltaY;
if (paddingTop > -headerViewHeight
&& getFirstVisiblePosition() == 0) {
headerView.setPadding(0, paddingTop, 0, 0);
Log.d("jiejie", "paddingtop" + paddingTop); if (paddingTop >= 0 && currentState == PULL_REFRESH) {
// 从下拉刷新进入松开刷新的状态
currentState = RELEASE_REFRESH;
refreshHeaderView();
} else if (paddingTop < 0 && currentState == RELEASE_REFRESH) {
// 进入下拉刷新的状态
currentState = PULL_REFRESH;
refreshHeaderView();
}
return true;// 拦截TouchMove,不让ListView处理该次move事件，不过会造成ListView无法滑动
}
break;
case MotionEvent.ACTION_UP:
if (currentState == PULL_REFRESH) {
// 隐藏headerView
headerView.setPadding(0, -headerViewHeight, 0, 0);
} else if (currentState == RELEASE_REFRESH) {
headerView.setPadding(0, 0, 0, 0);
currentState = REFRESHING;
refreshHeaderView();
if (listener != null) {
listener.onPullRefersh();
}
}
break;
}
return super.onTouchEvent(ev);
} /**
* 根据currentState来更新headerView
*/
private void refreshHeaderView() {
switch (currentState) { case PULL_REFRESH:
tv_state.setText("下拉刷新");
iv_arrow.startAnimation(downAnimation);
break; case RELEASE_REFRESH:
tv_state.setText("松开刷新");
iv_arrow.startAnimation(upAnimation);
break; case REFRESHING:
iv_arrow.clearAnimation();// 因为向上的旋转动画有可能没有执行完
iv_arrow.setVisibility(View.INVISIBLE);
pb_rotate.setVisibility(View.VISIBLE);
tv_state.setText("正在刷新...");
break;
} } /**
* 完成刷新操作，重置状态,在你获取完数据并更新完adater之后，去在UI线程中调用该方法
*/
public void completeRefresh() {
if (isLoadingMore) {
// 重置footerView状态
footerView.setPadding(0, -footerViewHeight, 0, 0);
isLoadingMore = false;
} else {
// 重置headerView状态
headerView.setPadding(0, -headerViewHeight, 0, 0);
currentState = PULL_REFRESH;
pb_rotate.setVisibility(View.INVISIBLE);
iv_arrow.setVisibility(View.VISIBLE);
tv_state.setText("下拉刷新");
tv_time.setText("最后刷新：" + getCurrentTime());
}
} /**
* 取得当前系统的时间，并格式化
*/
@SuppressLint("SimpleDateFormat")
private String getCurrentTime() {
SimpleDateFormat format = new SimpleDateFormat("yy-MM-dd HH:mm:ss");
return format.format(new Date());
} private OnRefreshListener listener; public void setOnRefreshListener(OnRefreshListener listener) {
this.listener = listener;
} public interface OnRefreshListener {
void onPullRefersh(); void onLoadingMore();
} /**
* SCROLL_STATE_IDLE:闲置状态，就是手指松开 SCROLL_STATE_TOUCH_SCROLL：手指触摸滑动，就是按着来滑动
* SCROLL_STATE_FLING：快速滑动后松开
*/
@Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
// TODO Auto-generated method stub } @Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
if (scrollState == OnScrollListener.SCROLL_STATE_IDLE
&& getLastVisiblePosition() == (getCount() - 1)
&& !isLoadingMore) {
isLoadingMore = true;
footerView.setPadding(0, 0, 0, 0);// 显示footerView
setSelection(getCount());// 让ListView的最后一条显示出来
if (listener != null) {
listener.onLoadingMore();
}
}
}
}
MainActivity的主代码
package com.demo.pullrefresh; import java.util.ArrayList;
import java.util.List; import com.demo.pullrefresh.view.RefreshListView;
import com.demo.pullrefresh.view.RefreshListView.OnRefreshListener; import android.annotation.SuppressLint;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.os.SystemClock;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.TextView;
import android.widget.Toast; public class MainActivity extends Activity implements OnItemClickListener {
private RefreshListView refreshListView;
private MyAdapter adapter; private List<String> list ; @Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
initView();
initData();
} private void initView() {
// TODO Auto-generated method stub
// requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.mainactivity);
refreshListView = (RefreshListView) findViewById(R.id.rf_mainlistview);
} private void initData() {
list = new ArrayList<String>();
for (int i = 0; i < 30; i++) {
list.add("ListView原来的数据—— " + i);
} adapter = new MyAdapter();
refreshListView.setAdapter(adapter);
refreshListView.setOnRefreshListener(new OnRefreshListener() { @Override
public void onPullRefersh() {
// TODO Auto-generated method stub
// 需要联网请求服务器的数据，然后更新UI
requestDataFromServer(false);
} @Override
public void onLoadingMore() {
// TODO Auto-generated method stub
requestDataFromServer(true);
}
});
refreshListView.setOnItemClickListener(this);
} @SuppressLint("HandlerLeak")
private Handler handler = new Handler() { @Override
public void handleMessage(Message msg) {
// 跟新UI
adapter.notifyDataSetChanged();
refreshListView.completeRefresh();
} }; /**
* 模拟向服务器请求数据
*
* @param isLoadingMore
*/
private void requestDataFromServer(final boolean isLoadingMore) {
new Thread() {
public void run() {
SystemClock.sleep(3000);// 模拟请求服务器的一个时间长度
Log.d("jiejie", isLoadingMore + "");
if (isLoadingMore) {
list.add("加载了更多的数据 ————1");
list.add("加载了更多的数据 ————2");
list.add("加载了更多的数据 ————3");
} else { }
handler.sendEmptyMessage(0);
};
}.start();
} @Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
// TODO Auto-generated method stub
Toast.makeText(MainActivity.this, "第" + arg2 + "个条目== " + list.get(arg2-1),
Toast.LENGTH_SHORT).show(); } private class MyAdapter extends BaseAdapter { @Override
public int getCount() {
// TODO Auto-generated method stub
return list.size();
} @Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return null;
} @Override
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return 0;
} @Override
public View getView(int arg0, View arg1, ViewGroup arg2) {
// TODO Auto-generated method stub
TextView textView = new TextView(MainActivity.this);
textView.setPadding(20, 20, 20, 20);
textView.setTextSize(18);
textView.setText(list.get(arg0));
return textView;
} } }
下面的listview是用PullToRefreshListView 框架来完成的页可以借鉴下
我是用xutils来进行网络的请求 Gson进行解析的
package com.it.hello.activity.fragment; import java.util.ArrayList;
import java.util.List; import org.xutils.x;
import org.xutils.common.Callback;
import org.xutils.http.RequestParams; import com.google.gson.Gson;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.PullToRefreshBase.Mode;
import com.handmark.pulltorefresh.library.PullToRefreshBase.OnRefreshListener2;
import com.handmark.pulltorefresh.library.PullToRefreshListView;
import com.it.hello.R;
import com.it.hello.activity.entity.MsgContent; import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView; /**
* 短信的接受 主要实现的是ListView的上拉刷新和下拉加载
*
* @author Administrator
*
*/
public class MTwoFragment extends Fragment { private String urlString = "http://111.39.245.157:9527/cmppbs/getCmpp30DeliverList.action";
private PullToRefreshListView mPullToRefreshListView;
private BaseAdapter adapter;
private int page = 0;
private List<MsgContent> list = new ArrayList<MsgContent>(); @Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
return inflater.inflate(R.layout.mtwofragment, container, false);
} @Override
public void onActivityCreated(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onActivityCreated(savedInstanceState);
setView();
} private void setView() {
// TODO Auto-generated method stub
mPullToRefreshListView = (PullToRefreshListView) getActivity()
.findViewById(R.id.lv_msg_recieve);
mPullToRefreshListView.setMode(Mode.BOTH);
ListView listView = mPullToRefreshListView.getRefreshableView();
// adapter.notifyDataSetChanged();
page = 1;
getAppHttp(page);
OnRefreshListener2<ListView> mListener2 = new OnRefreshListener2<ListView>() { @Override
public void onPullDownToRefresh(
PullToRefreshBase<ListView> refreshView) {
// TODO Auto-generated method stub
list.clear();
adapter.notifyDataSetChanged();
page = 1;
getAppHttp(page);
} @Override
public void onPullUpToRefresh(
PullToRefreshBase<ListView> refreshView) {
// TODO Auto-generated method stub
page++;
getAppHttp(page);
}
};
mPullToRefreshListView.setOnRefreshListener(mListener2);
adapter = new Msg();
listView.setAdapter(adapter);
} private void getAppHttp(int page2) {
// TODO Auto-generated method stub
RequestParams params = new RequestParams(urlString);
params.addBodyParameter("page", page2 + "");
params.addBodyParameter("rows", "5");
params.addBodyParameter("order", "desc");
x.http().get(params, new Callback.CommonCallback<String>() { @Override
public void onCancelled(CancelledException arg0) {
// TODO Auto-generated method stub } @Override
public void onError(Throwable arg0, boolean arg1) {
// TODO Auto-generated method stub } @Override
public void onFinished() {
// TODO Auto-generated method stub } @Override
public void onSuccess(String arg0) {
// TODO Auto-generated method stub
Log.d("jiejie", arg0);
if (arg0 != null) {
// 1 获取解析者
JsonParser parser = new JsonParser();
// 2 获取根节点
JsonElement element = parser.parse(arg0);
// 根据文档判断根节点属于什么类型的Gson节点对象
JsonObject root = element.getAsJsonObject();
// 获取节点下的某个节点的value
JsonArray array = root.getAsJsonArray("rows");
for (JsonElement obj : array) {
list.add(new Gson().fromJson(obj, MsgContent.class));
}
System.out.println(list.get(0).getMsgContent());
adapter.notifyDataSetChanged();
mPullToRefreshListView.onRefreshComplete();
}
}
});
} /**
* 短信接受的适配器
*
* @author Administrator
*
*/
private class Msg extends BaseAdapter { @Override
public int getCount() {
// TODO Auto-generated method stub
if (list != null) {
return list.size();
} else {
return 0;
}
} @Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return list.get(arg0);
} @Override
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return arg0;
} @Override
public View getView(int arg0, View arg1, ViewGroup arg2) {
// TODO Auto-generated method stub
ViewHolder holder = null;
if (arg1 == null) {
holder = new ViewHolder();
arg1 = View.inflate(getActivity(), R.layout.item_msgcontent,
null);
holder.textView = (TextView) arg1.findViewById(R.id.msg_phones);
holder.textView7 = (TextView) arg1.findViewById(R.id.moDates);
holder.textView3 = (TextView) arg1
.findViewById(R.id.msgLengths);
holder.textView4 = (TextView) arg1.findViewById(R.id.msgFmts);
holder.textView5 = (TextView) arg1
.findViewById(R.id.registeredDeliverys);
holder.textView6 = (TextView) arg1
.findViewById(R.id.msgContents);
arg1.setTag(holder);
} else {
holder = (ViewHolder) arg1.getTag();
}
MsgContent msgContent = list.get(arg0);
holder.textView7.setText(msgContent.getMoDate());
holder.textView3.setText("短信长度 ： " + msgContent.getMsgLength());
holder.textView4.setText("信息格式： " + msgContent.getMsgFmt());
int ddString = msgContent.getRegisteredDelivery();
if (ddString == 0) {
holder.textView5.setText("状态报告： " + " 不需要");
} else {
holder.textView5.setText("状态报告： " + " 需要");
}
holder.textView6.setText("短信内容： " + msgContent.getMsgContent());
return arg1;
} } static class ViewHolder {
TextView textView;
TextView textView2;
TextView textView3;
TextView textView4;
TextView textView5;
TextView textView6;
TextView textView7;
}
}