package com.jjmmbb.db.ex;
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;
import com.jjmmbb.dolist.R;
/**
* 下拉时显示headview的list<br/>
* 下拉时修改上边距,使headview逐渐显示;<br/>
* 上推时修改上边距,使headview逐渐隐藏;<br/>
* 松开时修改上边距,使headview完全隐藏;<br/>
*
* @author yizhe
* @date 2012-10-25
*/
public class MyListView extends ListView implements OnScrollListener {
private static final String TAG = "listview";
private final static int RELEASE_To_REFRESH = 0;// 松开刷新 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 状态
private final static int DONE = 3; // 取消操作 状态
private final static int LOADING = 4;
private boolean isBack;// 是否发生 "松开刷新" 到 "下拉刷新" 的状态转变
private final static int RATIO = 3;// 实际的padding的距离与界面上偏移距离的比例
private LayoutInflater inflater;
private LinearLayout headView; // listview的头
private TextView tipsTextview;// 提示文本
// private TextView lastUpdatedTextView; //最后更新时间的文本
private ImageView arrowImageView; // 箭头
private ProgressBar progressBar; // 进度条,刷新的时候用,dolist没有使用到
private RotateAnimation animation2up; // 箭头由下转到上的动画
private RotateAnimation animation2dowm; // 箭头由上转下的动画
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 int headContentWidth;
private int headContentHeight;// headview的实际内容高度
private int startY;
private int firstItemIndex;
private int state;// 状态
private OnRefreshListener refreshListener;// 刷新接口
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);
// lastUpdatedTextView.setVisibility(View.GONE);
measureView(headView);
headContentHeight = headView.getMeasuredHeight();
// headContentWidth = headView.getMeasuredWidth();
headView.setPadding(0, -1 * headContentHeight, 0, 0);
headView.invalidate();
addHeaderView(headView, null, false);// 添加头
setOnScrollListener(this);
animation2up = new RotateAnimation(0, -180,
RotateAnimation.RELATIVE_TO_SELF, 0.5f,
RotateAnimation.RELATIVE_TO_SELF, 0.5f);
animation2up.setInterpolator(new LinearInterpolator());
animation2up.setDuration(250);
animation2up.setFillAfter(true);
animation2dowm = new RotateAnimation(-180, 0,
RotateAnimation.RELATIVE_TO_SELF, 0.5f,
RotateAnimation.RELATIVE_TO_SELF, 0.5f);
animation2dowm.setInterpolator(new LinearInterpolator());
animation2dowm.setDuration(200);
animation2dowm.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);
// 下拉距离<headview的实际高度,进入 下拉刷新 状态
if (((tempY - startY) / RATIO < headContentHeight)
&& (tempY - startY) > 0) {
state = PULL_To_REFRESH;// 进入 下拉刷新 状态
isBack = true;
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);
// 下拉距离>headview的实际高度,进入 松开刷新 状态
if ((tempY - startY) / RATIO >= headContentHeight) {
state = RELEASE_To_REFRESH; // 进入 松开刷新 状态
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();
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paddingTop;达到向上推的效果
if (state == PULL_To_REFRESH) {
headView.setPadding(0, (tempY - startY) / RATIO
- headContentHeight, 0, 0);
}
// 更新headView的paddingTop;达到向下拉的效果
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(animation2up);
tipsTextview.setText("松开新增");
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.startAnimation(animation2dowm);
}
tipsTextview.setText("下拉新增");
Log.v(TAG, "当前状态，下拉新增");
break;
case REFRESHING:
headView.setPadding(0, 0, 0, 0); // headview归位,显示刷新中视图
// progressBar.setVisibility(View.VISIBLE); // 显示刷新中进度,dolist没有使用到
// arrowImageView.clearAnimation();
// arrowImageView.setVisibility(View.GONE); // 隐藏箭头
// tipsTextview.setText("正在刷新...");
// lastUpdatedTextView.setVisibility(View.VISIBLE);
Log.v(TAG, "当前状态,正在刷新...");
break;
case DONE:
// 通过设置上边距,使headview隐藏(下拉时修改上边距,使逐渐显示headview;)
headView.setPadding(0, -1 * headContentHeight, 0, 0);// 逐渐修改上边距可以实现回收动画
progressBar.setVisibility(View.GONE);
arrowImageView.clearAnimation();
// arrowImageView.setImageResource(R.drawable.arrow_down);
// tipsTextview.setText("下拉新增");
// lastUpdatedTextView.setVisibility(View.VISIBLE);
Log.v(TAG, "当前状态，done");
break;
}
}
// 设置刷新接口
public void setonRefreshListener(OnRefreshListener refreshListener) {
this.refreshListener = refreshListener;
isRefreshable = true;
}
// 刷新完成时,手动调用这个类
public void onRefreshComplete() {
// SimpleDateFormat format = new SimpleDateFormat("yyyy年MM月dd日 HH:mm");
// String date = format.format(new Date());
// lastUpdatedTextView.setText("最近更新:" + date);
state = DONE;
changeHeaderViewByState();
}
// 进入刷新状态时,将调用接口的刷新方法
private void onRefresh() {
if (refreshListener != null) {
refreshListener.onRefresh();
}
}
// 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) {
// SimpleDateFormat format = new SimpleDateFormat("yyyy年MM月dd日 HH:mm");
// String date = format.format(new Date());
// lastUpdatedTextView.setText("最近更新:" + date);
super.setAdapter(adapter);
}
// 刷新接口,实现本接口来完成刷新
public interface OnRefreshListener {
public void onRefresh();
}
}
head.xml
<?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:background="#ffffff" >
<!-- 内容 -->
<RelativeLayout
android:id="@+id/head_contentLayout"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:paddingLeft="30dp" >
<!-- 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/arrow_down" />
<!-- 进度条 -->
<ProgressBar
android:id="@+id/head_progressBar"
style="?android:attr/progressBarStyleSmall"
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:text="下拉刷新"
android:textSize="15dp" />
<!-- 最近更新 -->
<TextView
android:id="@+id/head_lastUpdatedTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="上次更新"
android:textSize="12dp" />
</LinearLayout>
</RelativeLayout>
</LinearLayout>
调用示例
listView.setAdapter(adapter);
listView.setonRefreshListener(new OnRefreshListener() {
public void onRefresh() {
// 这里执行刷新
// 刷新完了调用
adapter.notifyDataSetChanged();
listView.onRefreshComplete();
}
});
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