android_108_PullToRefresh

效果:



布局:

旋转动画

<?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>


主界面:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.sg31.sgpullrefresh.MainActivity" >

<com.sg31.sgpullrefresh.SGRefreshListView
android:id="@+id/refreshListView"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</com.sg31.sgpullrefresh.SGRefreshListView>

</RelativeLayout>

headerView

<?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_marginTop="10dp"
android:layout_marginBottom="10dp"
android:layout_height="wrap_content">

<ImageView android:layout_width="wrap_content"
android:layout_centerInParent="true"
android:id="@+id/iv_arrow"
android:background="@drawable/indicator_arrow"
android:layout_height="wrap_content"/>

<ProgressBar android:layout_width="30dp"
android:layout_centerInParent="true"
android:layout_height="30dp"
android:visibility="invisible"
android:id="@+id/pb_rotate"
android:indeterminateDuration="1000"
android:indeterminateDrawable="@drawable/indeterminate_drawable"
/>

</RelativeLayout>

<LinearLayout android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:layout_marginBottom="10dp"
android:gravity="center"
android:layout_marginLeft="15dp"
android:orientation="vertical">
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20sp"
android:id="@+id/tv_state"
android:textColor="#aa000000"
android:text="下拉刷新"/>
<TextView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="14sp"
android:id="@+id/tv_time"
android:textColor="@android:color/darker_gray"
android:text="最后刷新："/>

</LinearLayout>

</LinearLayout>

footerView

<?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_marginBottom="10dp"
android:layout_marginTop="10dp"
android:indeterminate="true"
android:indeterminateDrawable="@drawable/indeterminate_drawable"
android:indeterminateDuration="1000" />

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="10dp"
android:layout_marginLeft="15dp"
android:layout_marginTop="10dp"
android:text="加载更多..."
android:textColor="#aa000000"
android:textSize="20sp" />

</LinearLayout>

自定义ListView:

package com.sg31.sgpullrefresh;

import java.text.SimpleDateFormat;
import java.util.Date;

import android.content.Context;
import android.util.AttributeSet;
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;

// 必须手动导入
import android.widget.AbsListView.OnScrollListener;;

public class SGRefreshListView extends ListView implements OnScrollListener {

private View headerView;// headerView
private ImageView iv_arrow;
private ProgressBar pb_rotate;
private TextView tv_state, tv_time;
private View footerView;
private int footerViewHeight;

private int headerViewHeight;// headerView高

private int downY;// 按下时y坐标

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;

private RotateAnimation upAnimation, downAnimation;

private boolean isLoadingMore = false;// 当前是否正在处于加载更多

public SGRefreshListView(Context context) {
super(context);
init();
}

public SGRefreshListView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}

private void init() {
setOnScrollListener(this);
initHeaderView();
initRotateAnimation();
initFooterView();
}

/**
* 初始化headerView
*/
private void initHeaderView() {
headerView = View.inflate(getContext(), R.layout.refresh_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);

headerView.measure(0, 0);// 主动通知系统去测量该view;
headerViewHeight = headerView.getMeasuredHeight();
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);
}

private void initFooterView() {
footerView = View.inflate(getContext(), R.layout.refresh_footer, null);
footerView.measure(0, 0);// 主动通知系统去测量该view;
footerViewHeight = footerView.getMeasuredHeight();
// 隐藏
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:

if (currentState == REFRESHING) {
break;
}

int deltaY = (int) (ev.getY() - downY);

int paddingTop = -headerViewHeight + deltaY;
if (paddingTop > -headerViewHeight
&& getFirstVisiblePosition() == 0) {
headerView.setPadding(0, paddingTop, 0, 0);
// Log.e("RefreshListView", "paddingTop: "+paddingTop);

if (paddingTop >= 0 && currentState == PULL_REFRESH) {
// 从下拉刷新进入松开刷新状态
currentState = RELEASE_REFRESH;
refreshHeaderView();
} else if (paddingTop < 0 && currentState == RELEASE_REFRESH) {
// 进入下拉刷新状态
currentState = PULL_REFRESH;
refreshHeaderView();
}

return true;// 拦截TouchMove，不让listview处理该次move事件,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.onPullRefresh();
}
}
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());
}
}

/**
* 获取当前系统时间，并格式化
*
* @return
*/
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 onPullRefresh();

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
*/
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);// 显示出footerView
setSelection(getCount());// 让listview最后一条显示出来

if (listener != null) {
listener.onLoadingMore();
}
}
}

@Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
}

}


主控制器:

package com.sg31.sgpullrefresh;

import java.util.ArrayList;

import com.sg31.sgpullrefresh.SGRefreshListView.OnRefreshListener;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.os.Handler;
import android.os.SystemClock;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.BaseAdapter;
import android.widget.TextView;

public class MainActivity extends ActionBarActivity {
private SGRefreshListView refreshListView;

private ArrayList<String> list = new ArrayList<String>();

private MyAdapter adapter;

private Handler handler = new Handler() {
public void handleMessage(android.os.Message msg) {
// 更新UI
adapter.notifyDataSetChanged();
refreshListView.completeRefresh();
};
};

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
initView();
initData();
}

private void initView() {
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
refreshListView = (SGRefreshListView) findViewById(R.id.refreshListView);
}

private void initData() {
for (int i = 0; i < 15; i++) {
list.add("listview原来的数据 - " + i);
}

// final View headerView = View.inflate(this, R.layout.layout_header,
// null);
// 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
// int headerViewHeight = headerView.getMeasuredHeight();
// Log.e("MainActivity", "headerViewHeight: "+headerViewHeight);
// headerView.setPadding(0, -headerViewHeight, 0, 0);
// refreshListView.addHeaderView(headerView);//

adapter = new MyAdapter();
refreshListView.setAdapter(adapter);

refreshListView.setOnRefreshListener(new OnRefreshListener() {
@Override
public void onPullRefresh() {
// 需要联网请求服务器的数据，然后更新UI
requestDataFromServer(false);
}

@Override
public void onLoadingMore() {
requestDataFromServer(true);
}
});

}

/**
* 模拟向服务器请求数据
*/
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

if (isLoadingMore) {
list.add("加载更多的数据-1");
list.add("加载更多的数据-2");
list.add("加载更多的数据-3");
} else {
list.add(0, "下拉刷新的数据");
}

// 在UI线程更新UI
handler.sendEmptyMessage(0);
};
}.start();
}

class MyAdapter extends BaseAdapter {
public int getCount() {
return list.size();
}

public Object getItem(int position) {
return null;
}

public long getItemId(int position) {
return 0;
}

public View getView(int position, View convertView, ViewGroup parent) {
TextView textView = new TextView(MainActivity.this);
textView.setPadding(20, 20, 20, 20);
textView.setTextSize(18);

textView.setText(list.get(position));

return textView;
}

}

}