ListView裝上拉電阻下拉刷新
主要用到了這個幾個文件。MainActivity是界面的Activity,MyAdapter是ListView的本身定義適配,MyListView是本身定義帶頭部LIistView，假設僅僅需要上拉載入就不需要；activity_main.xml是住界面。item.xml是ListView的子佈局裏面僅僅有一個TextView,listview_footer.xml是listview的載入不少其它的底部佈局，listview_header.xml是listview的頭部佈局。java
MainActivity.javaandroid
package com.example.listview;
import java.util.ArrayList;
import java.util.List;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.Toast;
import com.example.listview.MyListView.OnRefreshListener;
public class MainActivity extends Activity implements OnScrollListener{
/** ListView*/
private MyListView listView;
/** 本身定義的Adapter*/
private MyAdapter adapter;
/** 一共的數據*/
private List<String> list=new ArrayList<String>();
/** ListView的底部佈局*/
private View footer;
private Handler handler;
private int count=0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
/** 配置好ListView*/
listView=(MyListView) findViewById(R.id.listView);
/** 加入底部佈局,要在setAdapter前,不然沒有效果*/
footer=LayoutInflater.from(this).inflate(R.layout.listview_footer, null);
listView.addFooterView(footer);
/** 適配listView*/
adapter=new MyAdapter(this, list);
listView.setAdapter(adapter);
/** 加入一個線程設置時間有等待的效果*/
handler=new Handler();
listView.setOnScrollListener(this);
listView.setonRefreshListener(new OnRefreshListener() {
@Override
public void onRefresh() {
new AsyncTask<Void, Void, Void>() {
protected Void doInBackground(Void... params) {
try {
Thread.sleep(1000);
} catch (Exception e) {
e.printStackTrace();
}
// list.add("刷新後加入的內容");
return null;
}
@Override
protected void onPostExecute(Void result) {
adapter.notifyDataSetChanged();
listView.onRefreshComplete();
}
}.execute(null, null, null);
}
});
setData();
}
/**
* 底部滾動的監聽
*/
@Override
public void onScrollStateChanged(final AbsListView view, int scrollState) {
/** 當滾動中止同一時候在底部的時候*/
if (scrollState == OnScrollListener.SCROLL_STATE_IDLE && (view.getLastVisiblePosition() == view.getCount() - 1)) {
/** 爲了有數據載入等待的時間。假設是網絡數據請求，則此處不需要直接請求接口就ok*/
handler.postDelayed(new Runnable() {
@Override
public void run() {
setData();
/** 讓刷新出來的數據從屏幕開始顯示,假設不設定位置，listView數據更新後會跑到第一條數據開始顯示*/
listView.setSelection(view.getCount()-1);
}
}, 2000);
}
}
@Override
public void onScroll(AbsListView arg0, int arg1, int arg2, int arg3) {
}
/** 放數據,假設你的數據可以分頁獲取就不需要這樣,此處是爲了有分頁的數據*/
@SuppressLint("ShowToast")
private void setData(){
//當數據到達總量的時候移除底部佈局
if(count>50){
listView.removeFooterView(footer);
Toast.makeText(this,"沒有不少其它數據", 500).show();
return;
}
for(int i=count;i<count+10;i++){
list.add("數據"+i);
}
count=count+10;
/** 通知adapter數據改變*/
adapter.notifyDataSetChanged();
}
}
MyListView.java
package com.example.listview;
import java.util.Date;
import android.content.Context;
import android.util.AttributeSet;
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.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;
/**
* ListView加入刷新頭部本身定義的ListView
*
* @author 劉梓未
*
*
*/
public class MyListView extends ListView implements OnScrollListener {
private final static int RELEASE_To_REFRESH = 0;// 下拉過程的狀態值
private final static int PULL_To_REFRESH = 1; // 從下拉返回到不刷新的狀態值
private final static int REFRESHING = 2;// 正在刷新的狀態值
private final static int DONE = 3;
private final static int LOADING = 4;
// 實際的padding的距離與界面上偏移距離的比例
private final static int RATIO = 3;
private LayoutInflater inflater;
// ListView頭部下拉刷新的佈局
private LinearLayout headerView;
private TextView lvHeaderTipsTv;
private TextView lvHeaderLastUpdatedTv;
private ImageView lvHeaderArrowIv;
private ProgressBar lvHeaderProgressBar;
// 定義頭部下拉刷新的佈局的高度
private int headerContentHeight;
private RotateAnimation animation;
private RotateAnimation reverseAnimation;
private int startY;
private int state;
private boolean isBack;
// 用於保證startY的值在一個完整的touch事件中僅僅被記錄一次
private boolean isRecored;
private OnRefreshListener refreshListener;
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(android.R.color.transparent));
inflater = LayoutInflater.from(context);
headerView = (LinearLayout) inflater.inflate(R.layout.listview_header, null);
lvHeaderTipsTv = (TextView) headerView
.findViewById(R.id.lvHeaderTipsTv);
lvHeaderLastUpdatedTv = (TextView) headerView
.findViewById(R.id.lvHeaderLastUpdatedTv);
lvHeaderArrowIv = (ImageView) headerView
.findViewById(R.id.lvHeaderArrowIv);
// 設置下拉刷新圖標的最小高度和寬度
lvHeaderArrowIv.setMinimumWidth(70);
lvHeaderArrowIv.setMinimumHeight(50);
lvHeaderProgressBar = (ProgressBar) headerView
.findViewById(R.id.lvHeaderProgressBar);
measureView(headerView);
headerContentHeight = headerView.getMeasuredHeight();
// 設置內邊距，正好距離頂部爲一個負的整個佈局的高度，正好把頭部隱藏
headerView.setPadding(0, -1 * headerContentHeight, 0, 0);
// 重繪一下
headerView.invalidate();
// 將下拉刷新的佈局加入ListView的頂部
addHeaderView(headerView, null, false);
// 設置滾動監聽事件
setOnScrollListener(this);
// 設置旋轉動畫事件
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);
// 一開始的狀態就是下拉刷新完的狀態。因此爲DONE
state = DONE;
// 是否正在刷新
isRefreshable = false;
}
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
if (isRefreshable) {
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
if (!isRecored) {
isRecored = true;
startY = (int) ev.getY();// 手指按下時記錄當前位置
}
break;
case MotionEvent.ACTION_UP:
if (state != REFRESHING && state != LOADING) {
if (state == PULL_To_REFRESH) {
state = DONE;
changeHeaderViewByState();
}
if (state == RELEASE_To_REFRESH) {
state = REFRESHING;
changeHeaderViewByState();
onLvRefresh();
}
}
isRecored = false;
isBack = false;
break;
case MotionEvent.ACTION_MOVE:
int tempY = (int) ev.getY();
if (!isRecored) {
isRecored = true;
startY = tempY;
}
if (state != REFRESHING && isRecored && state != LOADING) {
// 保證在設置padding的過程當中，當前的位置一直是在head。不然假設當列表超出屏幕的話，當在上推的時候。列表會同一時候進行滾動
// 可以鬆手去刷新了
if (state == RELEASE_To_REFRESH) {
setSelection(0);
// 往上推了。推到了屏幕足夠掩蓋head的程度，但是尚未推到全部掩蓋的地步
if (((tempY - startY) / RATIO < headerContentHeight)// 由鬆開刷新狀態轉變到下拉刷新狀態
&& (tempY - startY) > 0) {
state = PULL_To_REFRESH;
changeHeaderViewByState();
}
// 一會兒推到頂了
else if (tempY - startY <= 0) {// 由鬆開刷新狀態轉變到done狀態
state = DONE;
changeHeaderViewByState();
}
}
// 尚未到達顯示鬆開刷新的時候,DONE或者是PULL_To_REFRESH狀態
if (state == PULL_To_REFRESH) {
setSelection(0);
// 下拉到可以進入RELEASE_TO_REFRESH的狀態
if ((tempY - startY) / RATIO >= headerContentHeight) {// 由done或者下拉刷新狀態轉變到鬆開刷新
state = RELEASE_To_REFRESH;
isBack = true;
changeHeaderViewByState();
}
// 上推到頂了
else if (tempY - startY <= 0) {// 由DOne或者下拉刷新狀態轉變到done狀態
state = DONE;
changeHeaderViewByState();
}
}
// done狀態下
if (state == DONE) {
if (tempY - startY > 0) {
state = PULL_To_REFRESH;
changeHeaderViewByState();
}
}
// 更新headView的size
if (state == PULL_To_REFRESH) {
headerView.setPadding(0, -1 * headerContentHeight
+ (tempY - startY) / RATIO, 0, 0);
}
// 更新headView的paddingTop
if (state == RELEASE_To_REFRESH) {
headerView.setPadding(0, (tempY - startY) / RATIO
- headerContentHeight, 0, 0);
}
}
break;
default:
break;
}
}
return super.onTouchEvent(ev);
}
// 當狀態改變時候。調用該方法。以更新界面
private void changeHeaderViewByState() {
switch (state) {
case RELEASE_To_REFRESH:
lvHeaderArrowIv.setVisibility(View.VISIBLE);
lvHeaderProgressBar.setVisibility(View.GONE);
lvHeaderTipsTv.setVisibility(View.VISIBLE);
lvHeaderLastUpdatedTv.setVisibility(View.VISIBLE);
lvHeaderArrowIv.clearAnimation();// 清除動畫
lvHeaderArrowIv.startAnimation(animation);// 開始動畫效果
lvHeaderTipsTv.setText("鬆開刷新");
break;
case PULL_To_REFRESH:
lvHeaderProgressBar.setVisibility(View.GONE);
lvHeaderTipsTv.setVisibility(View.VISIBLE);
lvHeaderLastUpdatedTv.setVisibility(View.VISIBLE);
lvHeaderArrowIv.clearAnimation();
lvHeaderArrowIv.setVisibility(View.VISIBLE);
// 是由RELEASE_To_REFRESH狀態轉變來的
if (isBack) {
isBack = false;
lvHeaderArrowIv.clearAnimation();
lvHeaderArrowIv.startAnimation(reverseAnimation);
lvHeaderTipsTv.setText("下拉刷新");
} else {
lvHeaderTipsTv.setText("下拉刷新");
}
break;
case REFRESHING:
headerView.setPadding(0, 0, 0, 0);
lvHeaderProgressBar.setVisibility(View.VISIBLE);
lvHeaderArrowIv.clearAnimation();
lvHeaderArrowIv.setVisibility(View.GONE);
lvHeaderTipsTv.setText("正在刷新...");
lvHeaderLastUpdatedTv.setVisibility(View.VISIBLE);
break;
case DONE:
headerView.setPadding(0, -1 * headerContentHeight, 0, 0);
lvHeaderProgressBar.setVisibility(View.GONE);
lvHeaderArrowIv.clearAnimation();
lvHeaderArrowIv.setImageResource(R.drawable.head_arrow);
lvHeaderTipsTv.setText("下拉刷新");
lvHeaderLastUpdatedTv.setVisibility(View.VISIBLE);
break;
}
}
// 此方法直接照搬自網絡上的一個下拉刷新的demo，此處是「預計」headView的width以及height
private void measureView(View child) {
ViewGroup.LayoutParams params = child.getLayoutParams();
if (params == null) {
params = new ViewGroup.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
}
int childWidthSpec = ViewGroup.getChildMeasureSpec(0, 0 + 0,
params.width);
int lpHeight = params.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 setonRefreshListener(OnRefreshListener refreshListener) {
this.refreshListener = refreshListener;
isRefreshable = true;
}
public interface OnRefreshListener {
public void onRefresh();
}
@SuppressWarnings("deprecation")
public void onRefreshComplete() {
state = DONE;
lvHeaderLastUpdatedTv.setText("近期更新:" + new Date().toLocaleString());
changeHeaderViewByState();
}
private void onLvRefresh() {
if (refreshListener != null) {
refreshListener.onRefresh();
}
}
}
listview_footer.xml
<?xml version="1.0" encoding="utf-8"?網絡
> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="wrap_content" android:gravity="center" android:layout_marginTop="10dp" android:orientation="horizontal" > <ProgressBar android:id="@+id/footer_progress" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </LinearLayout> app
listview_header.xml
<?xml version="1.0" encoding="utf-8"?>
<!-- ListView的頭部 -->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
>
<!-- 內容 -->
<RelativeLayout
android:id="@+id/head_contentLayout"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="@drawable/list_header_bg"
android:paddingLeft="30dp">
<!-- 箭頭圖像、進度條 -->
<FrameLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true" >
<!-- 箭頭 -->
<ImageView
android:id="@+id/lvHeaderArrowIv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:src="@drawable/head_arrow" />
<!-- 進度條 -->
<ProgressBar
android:id="@+id/lvHeaderProgressBar"
style="?android:attr/progressBarStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:visibility="gone" />
</FrameLayout>
<!-- 提示、近期更新 -->
<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/lvHeaderTipsTv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="下拉刷新"
android:textSize="13sp" />
<!-- 近期更新 -->
<TextView
android:id="@+id/lvHeaderLastUpdatedTv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="最新更新"
android:textSize="10sp" />
</LinearLayout>
</RelativeLayout>
</LinearLayout>
下載連接
版權聲明：本文博主原創文章，博客，未經贊成不得轉載。ide
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