android自定义刷新类控件
浏览数：24 /
时间：2015年06月11日
android虽然定义了种类非常丰富的控件，但是有的时候这些自定义的控件还是不能满足我的要求，为了能够适配更多的需求，我们需要在原有的基础上进行自定义控件。
今天我向大家介绍的就是android中最常见的刷新类控件。因为我们最近正在参加一个项目，在项目组长的带领下，我学到了很多的东西，这对我的android技术的提升非常大，定义一个自定义控件可能不是很难，但是如何让这个自定义控件更加有效、更加快速地运行。
首先我们需要建立一个自定义控件类：
package com.example.ui.widget;
import com.example.androidtest.R;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.Animation;
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.ListAdapter;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;
/**
* 下拉刷新控件
*
* @author JeffLee
* @version 1.0
* @created 2014-10-21
*/
public class PullToRefreshListView extends ListView implements OnScrollListener {
private final static String TAG = "PullToRefreshListView";
private static final int MAX_Y_OVERSCROLL_DISTANCE = 100;
private Context mContext;
private int mMaxYOverscrollDistance;
// 下拉刷新标志
private final static int PULL_To_REFRESH = 0;
// 松开刷新标志
private final static int RELEASE_To_REFRESH = 1;
// 正在刷新标志
public final static int REFRESHING = 2;
// 刷新完成标志
private final static int DONE = 3;
private LayoutInflater inflater;
private LinearLayout headView;
private TextView tipsTextview;
private TextView lastUpdatedTextView;
private ImageView arrowImageView;
private ProgressBar progressBar;
// 用来设置箭头图标动画效果
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 headContentOriginalTopPadding;
private int startY;
private int firstItemIndex;
private int currentScrollState;
private int state;
private boolean isBack;
public OnRefreshListener refreshListener;
public OnLoadMoreListener loadMoreListener;
// -- footer view
private PullToRefreshFooter mFooterView;
private boolean mEnablePullLoad;
private boolean mPullLoading = false;
private boolean mIsFooterReady = false;
private float mFirstY = -1; // save event y
private boolean bloading = false;
public PullToRefreshListView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
public PullToRefreshListView(Context context, AttributeSet attrs,
int defStyle) {
super(context, attrs, defStyle);
init(context);
}
public int getState() {
return state;
}
private void init(Context context) {
mContext = context;
final DisplayMetrics metrics = mContext.getResources()
.getDisplayMetrics();
final float density = metrics.density;
mMaxYOverscrollDistance = (int) (density * MAX_Y_OVERSCROLL_DISTANCE);
// 设置滑动效果
animation = new RotateAnimation(0, -180, Animation.RELATIVE_TO_SELF,
0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
animation.setInterpolator(new LinearInterpolator());
animation.setDuration(200);
animation.setFillAfter(true);
reverseAnimation = new RotateAnimation(-180, 0,
Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,
0.5f);
reverseAnimation.setInterpolator(new LinearInterpolator());
reverseAnimation.setDuration(200);
reverseAnimation.setFillAfter(true);
inflater = LayoutInflater.from(context);
headView = (LinearLayout) inflater.inflate(
R.layout.pull_to_refresh_head, null);
arrowImageView = (ImageView) headView
.findViewById(R.id.head_arrowImageView);
// arrowImageView.setMinimumWidth(50);
// 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);
headContentOriginalTopPadding = headView.getPaddingTop();
measureView(headView);
headContentHeight = headView.getMeasuredHeight();
headContentWidth = headView.getMeasuredWidth();
headView.setPadding(headView.getPaddingLeft(), -1 * headContentHeight,
headView.getPaddingRight(), headView.getPaddingBottom());
headView.invalidate();
addHeaderView(headView);
// init footer view
mFooterView = new PullToRefreshFooter(context);
setOnScrollListener(this);
}
@Override
public void setAdapter(ListAdapter adapter) {
super.setAdapter(adapter);
}
// 需要有加载更多功能时候的设置adapter的方式
public void setLoadMoreAdapter(ListAdapter adapter) {
setAdapter(adapter);
addFooterView();
}
public void addFooterView() {
if (mIsFooterReady == false) {
mIsFooterReady = true;
mFooterView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// 不在下拉刷新状态，以及没有全部加载,且不在加载更多的状态下进行点击刷新
if (state != REFRESHING && !mPullLoading) { //
startLoadMore();
}
}
});
addFooterView(mFooterView);
}
}
/**
* stop load more, reset footer view.
*/
// public void stopLoadMore() {
// if (mPullLoading == true) {
// mPullLoading = false;
// mFooterView.setState(XListViewFooter.STATE_NORMAL);
// }
// }
public void completeLoadMore(int status) {
if (mPullLoading == true) {
state = PULL_To_REFRESH;
mPullLoading = false;
// mFooterView.setState(status);
}
mFooterView.setState(status);
}
public void setFooterState(int status) {
mFooterView.setState(status);
}
public int getFooterState() {
return mFooterView.getState();
}
private void startLoadMore() {
// 设置了加载更多的监听器，以及加载更多状态不是数据加载完毕，和为空数据的时候，都可以进行上滑刷新
if (loadMoreListener != null
&& mFooterView.getState() != PullToRefreshFooter.STATE_LOADFULL
&& mFooterView.getState() != PullToRefreshFooter.STATE_NULL) {
mPullLoading = true;
state = REFRESHING;
mFooterView.setState(PullToRefreshFooter.STATE_LOADING);
loadMoreListener.onLoadMore();
}
}
public void settingOnScroll(AbsListView view, int firstVisiableItem,
int visibleItemCount, int totalItemCount) {
firstItemIndex = firstVisiableItem;
// if (firstVisiableItem + visibleItemCount >=
// totalItemCount){//currentScrollState == SCROLL_STATE_TOUCH_SCROLL
// if (state != REFRESHING
// && ! mPullLoading) {
// startLoadMore();
// }
// }
}
public void settingOnScrollStateChanged(AbsListView view, int scrollState) {
currentScrollState = scrollState;
if (scrollState == SCROLL_STATE_IDLE && getCount() > 0) {
// 判断滚动到底部
if (view.getLastVisiblePosition() == (view.getCount() - 1)) {
if (state != REFRESHING && !mPullLoading) {
startLoadMore();
}
}
}
}
@Override
public void onScroll(AbsListView view, int firstVisiableItem,
int visibleItemCount, int totalItemCount) {
settingOnScroll(view, firstVisiableItem, visibleItemCount,
totalItemCount);
}
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
settingOnScrollStateChanged(view, scrollState);
}
public final boolean getLoadingState() {
return bloading;
}
public final void setLoadingState(boolean bloading) {
// Log.i(TAG, "setLoadingState bloading =" + bloading);
this.bloading = bloading;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (mFirstY == -1) {
mFirstY = event.getRawY();
}
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
if (firstItemIndex == 0 && !isRecored) {
startY = (int) event.getY();
isRecored = true;
}
break;
case MotionEvent.ACTION_CANCEL:// 失去焦点&取消动作
case MotionEvent.ACTION_UP:
if (state != REFRESHING) {
if (state == DONE) { // 当前-抬起-ACTION_UP：DONE什么都不做
} else if (state == PULL_To_REFRESH) { // 当前-抬起-ACTION_UP：PULL_To_REFRESH-->DONE-由下拉刷新状态到刷新完成状态
state = DONE;
changeHeaderViewByState();
} else if (state == RELEASE_To_REFRESH) { // 当前-抬起-ACTION_UP：RELEASE_To_REFRESH-->REFRESHING-由松开刷新状态，到刷新完成状态
state = REFRESHING;
changeHeaderViewByState();
onRefresh();
}
final float deltaY = event.getRawY() - mFirstY;
if ((deltaY < 0) && !mPullLoading
&& getLastVisiblePosition() == getCount() - 1) {
startLoadMore();
}
mFirstY = -1; // reset
}
isRecored = false;
isBack = false;
break;
case MotionEvent.ACTION_MOVE:
int tempY = (int) event.getY();
if (!isRecored && firstItemIndex == 0) {
isRecored = true;
startY = tempY;
}
// 如果正在加载，则不能进行刷新操作
if (bloading) {
break;
}
// Log.i(TAG,"tempY =" + tempY +";startY = "+startY);
if (state != REFRESHING && isRecored) {
// 可以松开刷新了
if (state == RELEASE_To_REFRESH) {
// 往上推，推到屏幕足够掩盖head的程度，但还没有全部掩盖
if ((tempY - startY < headContentHeight + 20)
&& (tempY - startY) > 0) {
state = PULL_To_REFRESH;
changeHeaderViewByState();
} else if (tempY - startY <= 0) { // 一下子推到顶
state = DONE;
changeHeaderViewByState();
} else { // 往下拉，或者还没有上推到屏幕顶部掩盖head
// 不用进行特别的操作，只用更新paddingTop的值就行了
}
} else if (state == PULL_To_REFRESH) { // 还没有到达显示松开刷新的时候,DONE或者是PULL_To_REFRESH状态
// 下拉到可以进入RELEASE_TO_REFRESH的状态
if (tempY - startY >= headContentHeight + 20) {
state = RELEASE_To_REFRESH;
isBack = true;
changeHeaderViewByState();
}
// 上推到顶了
else if (tempY - startY <= 0) {
state = DONE;
changeHeaderViewByState();
}
} else if (state == DONE) { // done状态下
if (tempY - startY > 0) {
state = PULL_To_REFRESH;
changeHeaderViewByState();
}
}
// 更新headView的size
if (state == PULL_To_REFRESH) {
int topPadding = ((-1 * headContentHeight + (tempY - startY)));
headView.setPadding(headView.getPaddingLeft(), topPadding,
headView.getPaddingRight(),
headView.getPaddingBottom());
headView.invalidate();
}
// 更新headView的paddingTop
if (state == RELEASE_To_REFRESH) {
int topPadding = ((tempY - startY - headContentHeight));
if (topPadding > mMaxYOverscrollDistance)
topPadding = mMaxYOverscrollDistance;
headView.setPadding(headView.getPaddingLeft(), topPadding,
headView.getPaddingRight(),
headView.getPaddingBottom());
headView.invalidate();
}
}
break;
default:
break;
}
if (state == RELEASE_To_REFRESH) {
return true;
}
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(R.string.pull_to_refresh_release_label);
break;
case PULL_To_REFRESH:
progressBar.setVisibility(View.GONE);
tipsTextview.setVisibility(View.VISIBLE);
lastUpdatedTextView.setVisibility(View.VISIBLE);
arrowImageView.clearAnimation();
arrowImageView.setVisibility(View.VISIBLE);
if (isBack) {
isBack = false;
arrowImageView.clearAnimation();
arrowImageView.startAnimation(reverseAnimation);
}
tipsTextview.setText(R.string.pull_to_refresh_pull_label);
break;
case REFRESHING:
headView.setPadding(headView.getPaddingLeft(),
headContentOriginalTopPadding, headView.getPaddingRight(),
headView.getPaddingBottom());
headView.invalidate();
progressBar.setVisibility(View.VISIBLE);
arrowImageView.clearAnimation();
arrowImageView.setVisibility(View.GONE);
tipsTextview.setText(R.string.pull_to_refresh_refreshing_label);
lastUpdatedTextView.setVisibility(View.GONE);
break;
case DONE: {
headView.setPadding(headView.getPaddingLeft(), -1
* headContentHeight, headView.getPaddingRight(),
headView.getPaddingBottom());
progressBar.setVisibility(View.GONE);
arrowImageView.clearAnimation();
// 此处更换图标
// arrowImageView.setImageResource(R.drawable.ic_pulltorefresh_arrow);
Bitmap arrow = BitmapFactory.decodeResource(getResources(),
R.drawable.ic_pulltorefresh_arrow);
Drawable background = new BitmapDrawable(arrow);
arrowImageView.setBackgroundDrawable(background);
tipsTextview.setText(R.string.pull_to_refresh_pull_label);
lastUpdatedTextView.setVisibility(View.VISIBLE);
headView.invalidate();
}
break;
}
}
// 点击刷新
public void clickRefresh() {
setSelection(0);
state = REFRESHING;
changeHeaderViewByState();
onRefresh();
}
public void setOnRefreshListener(OnRefreshListener refreshListener) {
this.refreshListener = refreshListener;
}
public void setOnLoadMoreListener(OnLoadMoreListener loadMoreListener) {
this.loadMoreListener = loadMoreListener;
}
public interface OnRefreshListener {
public void onRefresh();
}
public interface OnLoadMoreListener {
public void onLoadMore();
}
public void onRefreshComplete(String update) {
lastUpdatedTextView.setText(update);
onRefreshComplete();
}
public void firstRefreshing() {
state = REFRESHING;
headView.setPadding(0, 10, 0, 0);
progressBar.setVisibility(View.VISIBLE);
arrowImageView.clearAnimation();
arrowImageView.setVisibility(View.GONE);
tipsTextview.setText(R.string.pull_to_refresh_refreshing_label);
lastUpdatedTextView.setVisibility(View.GONE);
}
/**
* stop refresh, reset header view.
*/
public void stopRefresh() {
state = PULL_To_REFRESH;
changeHeaderViewByState();
}
public void onRefreshComplete() {
state = DONE;
changeHeaderViewByState();
setSelection(0);
}
public void onRefreshComplete(int loadMoreStatus) {
onRefreshComplete();
mFooterView.setState(loadMoreStatus);
}
private void onRefresh() {
if (refreshListener != null) {
refreshListener.onRefresh();
}
}
// 计算headView的width及height值
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);
}
/*
* @Override protected boolean overScrollBy(int deltaX, int deltaY, int
* scrollX, int scrollY, int scrollRangeX, int scrollRangeY, int
* maxOverScrollX, int maxOverScrollY, boolean isTouchEvent) { // This is
* where the magic happens, we have replaced the incoming // maxOverScrollY
* with our own custom variable mMaxYOverscrollDistance;
*
* return super.overScrollBy(deltaX, deltaY, scrollX, scrollY, scrollRangeX,
* scrollRangeY, maxOverScrollX, mMaxYOverscrollDistance, isTouchEvent); }
*/
}下面是pull_to_refresh_head.xml文件：
<?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:clickable="true"
android:focusable="false"
android:orientation="vertical" >
<RelativeLayout
android:id="@+id/head_contentLayout"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:paddingBottom="10dip"
android:paddingTop="10dip" >
<ImageView
android:id="@+id/head_arrowImageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerVertical="true"
android:layout_marginLeft="50dp"
android:background="@drawable/ic_pulltorefresh_arrow" />
<FrameLayout
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:layout_marginLeft="100dip"
android:layout_marginRight="10dip"
android:paddingBottom="10dip"
android:paddingTop="10dip" >
<ProgressBar
android:id="@+id/head_progressBar"
style="@style/loading_small"
android:visibility="gone" />
</FrameLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:gravity="center_horizontal"
android:orientation="vertical" >
<TextView
android:id="@+id/head_tipsTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/pull_to_refresh_pull_label"
android:textColor="@color/list_title" />
<TextView
android:id="@+id/head_lastUpdatedTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@color/list_title"
android:textSize="10sp"
android:visibility="gone" />
</LinearLayout>
</RelativeLayout>
</LinearLayout>package com.example.ui.widget;
import com.example.androidtest.R;
import android.content.Context;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.RelativeLayout;
import android.widget.TextView;
public class PullToRefreshFooter extends RelativeLayout {
public final static int STATE_NORMAL = 0; //正常状态，还有更多需要加载
public final static int STATE_READY = 1;
public final static int STATE_LOADING = 2; //正在加载中
public final static int STATE_LOADFULL = 3;//数据全部加载完
public final static int STATE_NULL = 4;//没有数据，初始状态
private Context mContext;
private View mContentView;
private View mProgressBar;
private TextView mHintView;
private int state;
public PullToRefreshFooter(Context context) {
super(context);
initView(context);
setVisibility(View.GONE);
}
public PullToRefreshFooter(Context context, AttributeSet attrs) {
super(context, attrs);
initView(context);
}
public void setState(int state) {
this.state = state;
// mHintView.setVisibility(View.INVISIBLE);
// mProgressBar.setVisibility(View.INVISIBLE);
// mHintView.setVisibility(View.INVISIBLE);
mProgressBar.setVisibility(View.GONE);
mHintView.setVisibility(View.VISIBLE);
setVisibility(View.VISIBLE);
if (state == STATE_READY) {
mHintView.setText(R.string.load_ready);
} else if (state == STATE_LOADING) {
mProgressBar.setVisibility(View.VISIBLE);
mHintView.setText(R.string.load_ing);
} else if (state == STATE_LOADFULL){
mHintView.setText(R.string.load_full);
} else if (state == STATE_NULL) {
mHintView.setText(R.string.load_empty);
//setVisibility(View.GONE);
} else {
mHintView.setText(R.string.load_more);
}
}
public int getState() {
return state;
}
public void setBottomMargin(int height) {
if (height < 0) return ;
RelativeLayout.LayoutParams lp = (RelativeLayout.LayoutParams)mContentView.getLayoutParams();
lp.bottomMargin = height;
mContentView.setLayoutParams(lp);
}
public int getBottomMargin() {
RelativeLayout.LayoutParams lp = (RelativeLayout.LayoutParams)mContentView.getLayoutParams();
return lp.bottomMargin;
}
/**
* normal status
*/
public void normal() {
mHintView.setVisibility(View.VISIBLE);
mProgressBar.setVisibility(View.GONE);
}
/**
* loading status
*/
public void loading() {
mHintView.setVisibility(View.GONE);
mProgressBar.setVisibility(View.VISIBLE);
}
/**
* hide footer when disable pull load more
*/
public void hide() {
RelativeLayout.LayoutParams lp = (RelativeLayout.LayoutParams)mContentView.getLayoutParams();
lp.height = 0;
mContentView.setLayoutParams(lp);
}
/**
* show footer
*/
public void show() {
RelativeLayout.LayoutParams lp = (RelativeLayout.LayoutParams)mContentView.getLayoutParams();
lp.height = android.view.ViewGroup.LayoutParams.WRAP_CONTENT;
mContentView.setLayoutParams(lp);
}
private void initView(Context context) {
mContext = context;
RelativeLayout moreView = (RelativeLayout)LayoutInflater.from(mContext).inflate(R.layout.listview_footer, null);
addView(moreView);
moreView.setLayoutParams(new RelativeLayout.LayoutParams(android.view.ViewGroup.LayoutParams.FILL_PARENT, android.view.ViewGroup.LayoutParams.WRAP_CONTENT));
mContentView = moreView.findViewById(R.id.listview_foot_content);
mProgressBar = moreView.findViewById(R.id.listview_foot_progress);
mHintView = (TextView)moreView.findViewById(R.id.listview_foot_more);
}
}
下面是listview_footer.xml文件：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/listview_foot_content"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:padding="3dp"
android:clickable="true"
android:focusable="false">
<TextView android:id="@+id/listview_foot_more"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:padding="5dp"
android:textColor="@color/list_subTitle"
android:text="@string/load_empty"/>
<ProgressBar
android:id="@+id/listview_foot_progress"
android:layout_toLeftOf="@id/listview_foot_more"
android:layout_centerVertical="true"
style="@style/loading_small"/>
</RelativeLayout>然后我们就可以使用这个刷新类的自定义控件了，
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
android:orientation="vertical"
tools:context=".PullRefreshActivity" >
<com.example.ui.widget.PullToRefreshListView
android:id="@+id/listview"
style="@style/common_listview"
android:layout_width="match_parent"
android:divider="@drawable/divided_line"
android:dividerHeight="1dp"
android:listSelector="@drawable/listview_item_nocolor_selector"
android:paddingLeft="8dp"
android:paddingRight="8dp"
android:scrollbars="none" >
</com.example.ui.widget.PullToRefreshListView>
</LinearLayout>然后再Activity中加载这个控件：
package com.example.androidtest;
import com.example.ui.adapter.PullRefreshAdapter;
import com.example.ui.widget.PullToRefreshListView;
import com.example.ui.widget.PullToRefreshListView.OnRefreshListener;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.widget.Toast;
public class PullRefreshActivity extends Activity {
private Context mContext;
private PullRefreshAdapter pullRefreshAdapter;
private PullToRefreshListView listView;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_pulltorefresh);
initView();
initListView();
}
private void initView() {
mContext = this;
listView = (PullToRefreshListView) findViewById(R.id.listview);
}
private void initListView() {
pullRefreshAdapter = new PullRefreshAdapter(mContext);
listView.setLoadMoreAdapter(pullRefreshAdapter);
listView.setOnRefreshListener(new OnRefreshListener() {
@Override
public void onRefresh() {
// TODO Auto-generated method stub
Toast.makeText(mContext, "哈哈", Toast.LENGTH_SHORT).show();
}
});
}
}
package com.example.ui.adapter;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
public class PullRefreshAdapter extends BaseAdapter {
private Context mContext;
public PullRefreshAdapter(Context context) {
super();
this.mContext = context;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return 0;
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return null;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
return null;
}
}
得到的效果如下：
上面显示出来了加载刷新的功能，可以在需要刷新的时候显示这个控件，这样对UI显示地比较方面。由于时间比较仓促，暂时先放上源码，以后再好好分析源码，请大家多多指教。
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