Android刷新加載框架詳解
更新時(shí)間：2017年12月13日 09:01:28 作者：Sun2Ming
這篇文章主要為大家詳細(xì)介紹了Android刷新加載框架的相關(guān)資料，具有一定的參考價(jià)值，感興趣的小伙伴們可以參考一下
本文實(shí)例為大家分享了Android刷新加載框架的具體代碼，供大家參考，具體內(nèi)容如下
1.定義一個(gè)接口控制下拉和上拉
public interface Pullable {
/**
* 是否可下拉
*/
boolean canPullDown();
/**
* 是否可上拉
*/
boolean canPullUp();
}
2.定義一個(gè)刷新加載布局
public class PullToRefreshLayout extends RelativeLayout {
/**
* 頭
*/
private View headView;//頭視圖
private ImageView headIv;//頭圖標(biāo)
private TextView headTv;//頭文字
private int headHeight;//頭高度
private float headBorder;//頭臨界
/**
* 拉
*/
private View pullView;//拉視圖
private int pullHeight;//拉高度
private int pullWidth;//拉寬度
/**
* 尾
*/
private View footView;//尾視圖
private ImageView footIv;//尾圖標(biāo)
private TextView footTv;//尾文字
private int footHeight;//尾高度
private float footBorder;//尾臨界
/**
* 狀態(tài)
*/
public static final int INIT = 0;//初始
public static final int RELEASE_TO_REFRESH = 1;//釋放刷新
public static final int REFRESHING = 2;//正在刷新
public static final int RELEASE_TO_LOAD = 3;//釋放加載
public static final int LOADING = 4;//正在加載
public static final int DONE = 5;//完成
private int state = INIT;
/**
* 接口
*/
private OnRefreshListener mListener;
private float downY;//按下時(shí)Y坐標(biāo)
private float lastY;//上一個(gè)Y坐標(biāo)
private float pullDownY = 0;//下拉偏移量
private float pullUpY = 0;//上拉偏移量
private int offset;//偏移量
/**
* 動(dòng)畫
*/
private RotateAnimation rotateAnimation;
/**
* 線程
*/
private Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
if (msg != null) {
switch (msg.what) {
case 1:
headIv.clearAnimation();
break;
case 2:
footIv.clearAnimation();
break;
default:
break;
}
pullDownY = 0;
pullUpY = 0;
requestLayout();
state = INIT;
refreshViewByState();
isTouch = true;
}
}
};
/**
* 第一次執(zhí)行布局
*/
private boolean isLayout = false;
/**
* 在刷新過程中滑動(dòng)操作
*/
private boolean isTouch = false;
/**
* 手指滑動(dòng)距離與下拉頭的滑動(dòng)距離比，中間會(huì)隨正切函數(shù)變化
*/
private float radio = 2;
/**
* 過濾多點(diǎn)觸碰
*/
private int mEvents;
/**
* 這兩個(gè)變量用來控制pull的方向，如果不加控制，當(dāng)情況滿足可上拉又可下拉時(shí)沒法下拉
*/
private boolean canPullDown = true;
private boolean canPullUp = true;
public void setOnRefreshListener(OnRefreshListener listener) {
mListener = listener;
}
public PullToRefreshLayout(Context context) {
super(context);
initView(context);
}
public PullToRefreshLayout(Context context, AttributeSet attrs) {
super(context, attrs);
initView(context);
}
public PullToRefreshLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
initView(context);
}
private void initView(Context context) {
rotateAnimation = (RotateAnimation) AnimationUtils.loadAnimation(context, R.anim.rotating);
}
private void refreshViewByState() {
switch (state) {
case INIT:
// 下拉布局初始狀態(tài)
headIv.setImageResource("下拉刷新顯示的圖片");
headTv.setText("下拉刷新");
// 上拉布局初始狀態(tài)
footIv.setImageResource("上拉加載顯示的圖片");
footTv.setText("上拉加載");
break;
case RELEASE_TO_REFRESH:
// 釋放刷新狀態(tài)
headIv.setImageResource("釋放刷新顯示的圖片");
headTv.setText("釋放刷新");
break;
case REFRESHING:
// 正在刷新狀態(tài)
headIv.setImageResource("正在刷新顯示的圖片");
headTv.setText("正在刷新");
break;
case RELEASE_TO_LOAD:
// 釋放加載狀態(tài)
footIv.setImageResource("釋放加載顯示的圖片");
footTv.setText("釋放加載");
break;
case LOADING:
// 正在加載狀態(tài)
footIv.setImageResource("正在加載顯示的圖片");
footTv.setText("正在加載");
break;
case DONE:
// 刷新或加載完畢，啥都不做
break;
}
}
/**
* 不限制上拉或下拉
*/
private void releasePull() {
canPullDown = true;
canPullUp = true;
}
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
switch (ev.getActionMasked()) {
case MotionEvent.ACTION_DOWN:
downY = ev.getY();
lastY = downY;
mEvents = 0;
releasePull();
if (state != REFRESHING && state != LOADING) {
isTouch = true;
}
break;
case MotionEvent.ACTION_POINTER_DOWN:
case MotionEvent.ACTION_POINTER_UP:
// 過濾多點(diǎn)觸碰
mEvents = -1;
break;
case MotionEvent.ACTION_MOVE:
if (mEvents == 0) {
if (pullDownY > 0 || (((Pullable) pullView).canPullDown()
&& canPullDown && state != LOADING && state != REFRESHING)) {
// 可以下拉，正在加載時(shí)不能下拉
// 對(duì)實(shí)際滑動(dòng)距離做縮小，造成用力拉的感覺
pullDownY = pullDownY + (ev.getY() - lastY) / radio;
if (pullDownY < 0) {
pullDownY = 0;
canPullDown = false;
canPullUp = true;
}
if (pullDownY > getMeasuredHeight()) {
pullDownY = getMeasuredHeight();
}
if (state == REFRESHING) {
// 正在刷新的時(shí)候觸摸移動(dòng)
isTouch = false;
}
} else if (pullUpY < 0
|| (((Pullable) pullView).canPullUp() && canPullUp && state != REFRESHING && state != LOADING)) {
// 可以上拉，正在刷新時(shí)不能上拉
pullUpY = pullUpY + (ev.getY() - lastY) / radio;
if (pullUpY > 0) {
pullUpY = 0;
canPullDown = true;
canPullUp = false;
}
if (pullUpY < -getMeasuredHeight()) {
pullUpY = -getMeasuredHeight();
}
if (state == LOADING) {
// 正在加載的時(shí)候觸摸移動(dòng)
isTouch = false;
}
}
}
if (isTouch) {
lastY = ev.getY();
if (pullDownY > 0 || pullUpY < 0) {
requestLayout();
}
if (pullDownY > 0) {
if (pullDownY <= headBorder && (state == RELEASE_TO_REFRESH || state == DONE)) {
// 如果下拉距離沒達(dá)到刷新的距離且當(dāng)前狀態(tài)是釋放刷新，改變狀態(tài)為下拉刷新
state = INIT;
refreshViewByState();
}
if (pullDownY >= headBorder && state == INIT) {
// 如果下拉距離達(dá)到刷新的距離且當(dāng)前狀態(tài)是初始狀態(tài)刷新，改變狀態(tài)為釋放刷新
state = RELEASE_TO_REFRESH;
refreshViewByState();
}
} else if (pullUpY < 0) {
// 下面是判斷上拉加載的，同上，注意pullUpY是負(fù)值
if (-pullUpY <= footBorder && (state == RELEASE_TO_LOAD || state == DONE)) {
state = INIT;
refreshViewByState();
}
// 上拉操作
if (-pullUpY >= footBorder && state == INIT) {
state = RELEASE_TO_LOAD;
refreshViewByState();
}
}
// 因?yàn)樗⑿潞图虞d操作不能同時(shí)進(jìn)行，所以pullDownY和pullUpY不會(huì)同時(shí)不為0，因此這里用(pullDownY +
// Math.abs(pullUpY))就可以不對(duì)當(dāng)前狀態(tài)作區(qū)分了
if ((pullDownY + Math.abs(pullUpY)) > 8) {
// 防止下拉過程中誤觸發(fā)長(zhǎng)按事件和點(diǎn)擊事件
ev.setAction(MotionEvent.ACTION_CANCEL);
}
}
break;
case MotionEvent.ACTION_UP:
if (pullDownY > headBorder || -pullUpY > footBorder) {
// 正在刷新時(shí)往下拉（正在加載時(shí)往上拉），釋放后下拉頭（上拉頭）不隱藏
isTouch = false;
}
if (state == RELEASE_TO_REFRESH) {
state = REFRESHING;
refreshViewByState();
// 刷新操作
if (mListener != null) {
canPullDown = false;
pullDownY = headBorder;
pullUpY = 0;
requestLayout();
headIv.startAnimation(rotateAnimation);
mListener.onRefresh(this);
}
} else if (state == RELEASE_TO_LOAD) {
state = LOADING;
refreshViewByState();
// 加載操作
if (mListener != null) {
canPullUp = false;
pullDownY = 0;
pullUpY = -footBorder;
requestLayout();
footIv.startAnimation(rotateAnimation);
mListener.onLoadMore(this);
}
} else {
pullDownY = 0;
pullUpY = 0;
requestLayout();
}
default:
break;
}
// 事件分發(fā)交給父類
super.dispatchTouchEvent(ev);
return true;
}
public void hideHeadView() {
handler.sendEmptyMessage(1);
}
public void hideFootView() {
handler.sendEmptyMessage(2);
}
private void initView() {
// 初始化下拉布局
headIv = (ImageView) headView.findViewById(R.id.iv_head);
headTv = (TextView) headView.findViewById(R.id.tv_head);
//初始化上拉布局
footIv = (ImageView) footView.findViewById(R.id.iv_foot);
footTv = (TextView) footView.findViewById(R.id.tv_foot);
refreshViewByState();
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
if (!isLayout) {
// 這里是第一次進(jìn)來的時(shí)候做一些初始化
headView = getChildAt(0);
pullView = getChildAt(1);
footView = getChildAt(2);
headBorder = ((ViewGroup) headView).getChildAt(0).getMeasuredHeight();
footBorder = ((ViewGroup) footView).getChildAt(0).getMeasuredHeight();
headHeight = headView.getMeasuredHeight();
pullHeight = pullView.getMeasuredHeight();
footHeight = footView.getMeasuredHeight();
pullWidth = pullView.getMeasuredWidth();
initView();
isLayout = true;
}
// 改變子控件的布局，這里直接用(pullDownY + pullUpY)作為偏移量，這樣就可以不對(duì)當(dāng)前狀態(tài)作區(qū)分
offset = (int) (pullDownY + pullUpY);
headView.layout(0, -headHeight + offset, pullWidth, offset);
pullView.layout(0, offset, pullWidth, pullHeight + offset);
footView.layout(0, pullHeight + offset, pullWidth, pullHeight + footHeight + offset);
}
public interface OnRefreshListener {
void onRefresh(PullToRefreshLayout pullToRefreshLayout);
void onLoadMore(PullToRefreshLayout pullToRefreshLayout);
}
}
3.自定義View
ListView
public class PullableListView extends ListView implements Pullable {
public PullableListView(Context context) {
super(context);
}
public PullableListView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public PullableListView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
public boolean canPullDown() {
if (getCount() == 0) {
// 沒有item的時(shí)候也可以下拉刷新
return false;
} else if (getFirstVisiblePosition() == 0 && getChildAt(0).getTop() >= 0) {
// 滑到ListView的頂部了
return true;
} else
return false;
}
@Override
public boolean canPullUp() {
if (getCount() == 0) {
// 沒有item的時(shí)候也可以上拉加載
return false;
} else if (getLastVisiblePosition() == (getCount() - 1)) {
// 滑到底部了
if (getChildAt(getLastVisiblePosition() - getFirstVisiblePosition()) != null
&& getChildAt(getLastVisiblePosition() - getFirstVisiblePosition())
.getBottom() <= getMeasuredHeight())
return true;
}
return false;
}
}
GridView
public class PullableGridView extends GridView implements Pullable {
public PullableGridView(Context context) {
super(context);
}
public PullableGridView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public PullableGridView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
public boolean canPullDown() {
if (getCount() == 0) {
// 沒有item的時(shí)候也可以下拉刷新
return false;
} else if (getFirstVisiblePosition() == 0
&& getChildAt(0).getTop() >= 0) {
// 滑到頂部了
return true;
} else
return false;
}
@Override
public boolean canPullUp() {
if (getCount() == 0) {
// 沒有item的時(shí)候也可以上拉加載
return false;
} else if (getLastVisiblePosition() == (getCount() - 1)) {
// 滑到底部了
if (getChildAt(getLastVisiblePosition() - getFirstVisiblePosition()) != null
&& getChildAt(
getLastVisiblePosition()
- getFirstVisiblePosition()).getBottom() <= getMeasuredHeight())
return true;
}
return false;
}
}
RecyclerView
public class PullableRecyclerView extends RecyclerView implements Pullable {
public PullableRecyclerView(Context context) {
super(context);
}
public PullableRecyclerView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
}
public PullableRecyclerView(Context context, @Nullable AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
public boolean canPullDown() {
RecyclerView.LayoutManager layoutManager = getLayoutManager();
if (layoutManager instanceof LinearLayoutManager) {
LinearLayoutManager linearLayoutManager = (LinearLayoutManager) layoutManager;
if (linearLayoutManager.getItemCount() == 0) {
return false;
} else if (linearLayoutManager.findFirstVisibleItemPosition() == 0 && linearLayoutManager.getChildAt(0).getTop() >= 0) {
return true;
} else {
return false;
}
} else if (layoutManager instanceof StaggeredGridLayoutManager) {
StaggeredGridLayoutManager staggeredGridLayoutManager = (StaggeredGridLayoutManager) layoutManager;
if (staggeredGridLayoutManager.getItemCount() == 0) {
return false;
} else {
int[] firstVisibleItems = null;
firstVisibleItems = staggeredGridLayoutManager.findFirstVisibleItemPositions(firstVisibleItems);
if (firstVisibleItems != null && firstVisibleItems.length > 0) {
if (staggeredGridLayoutManager.getChildCount() + firstVisibleItems[0] == staggeredGridLayoutManager.getItemCount()) {
return true;
}
}
}
}
return false;
}
@Override
public boolean canPullUp() {
RecyclerView.LayoutManager layoutManager = getLayoutManager();
if (layoutManager instanceof LinearLayoutManager) {
LinearLayoutManager linearLayoutManager = (LinearLayoutManager) layoutManager;
if (linearLayoutManager.getItemCount() == 0) {
return false;
} else if (linearLayoutManager.findLastVisibleItemPosition() == (linearLayoutManager.getItemCount() - 1)) {
if (linearLayoutManager.getChildAt(linearLayoutManager.findLastVisibleItemPosition() - linearLayoutManager.findFirstVisibleItemPosition()) != null
&& linearLayoutManager.getChildAt(linearLayoutManager.findLastVisibleItemPosition() - linearLayoutManager.findFirstVisibleItemPosition()).getBottom() <= getMeasuredHeight()) {
return true;
}
}
} else if (layoutManager instanceof StaggeredGridLayoutManager) {
StaggeredGridLayoutManager staggeredGridLayoutManager = (StaggeredGridLayoutManager) layoutManager;
if (staggeredGridLayoutManager.getItemCount() == 0) {
return false;
} else {
int[] lastPositions = new int[staggeredGridLayoutManager.getSpanCount()];
lastPositions = staggeredGridLayoutManager.findLastVisibleItemPositions(lastPositions);
if (findMax(lastPositions) >= staggeredGridLayoutManager.getItemCount() - 1) {
return true;
}
}
}
return false;
}
private int findMax(int[] lastPositions) {
int max = lastPositions[0];
for (int value : lastPositions) {
if (value > max) {
max = value;
}
}
return max;
}
}
ExpandableListView
public class PullableExpandableListView extends ExpandableListView implements
Pullable {
public PullableExpandableListView(Context context) {
super(context);
}
public PullableExpandableListView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public PullableExpandableListView(Context context, AttributeSet attrs,
int defStyle) {
super(context, attrs, defStyle);
}
@Override
public boolean canPullDown() {
if (getCount() == 0) {
// 沒有item的時(shí)候也可以下拉刷新
return false;
} else if (getFirstVisiblePosition() == 0
&& getChildAt(0).getTop() >= 0) {
// 滑到頂部了
return true;
} else
return false;
}
@Override
public boolean canPullUp() {
if (getCount() == 0) {
// 沒有item的時(shí)候也可以上拉加載
return false;
} else if (getLastVisiblePosition() == (getCount() - 1)) {
// 滑到底部了
if (getChildAt(getLastVisiblePosition() - getFirstVisiblePosition()) != null
&& getChildAt(
getLastVisiblePosition()
- getFirstVisiblePosition()).getBottom() <= getMeasuredHeight())
return true;
}
return false;
}
}
ScrollView
public class PullableScrollView extends ScrollView implements Pullable {
public PullableScrollView(Context context) {
super(context);
}
public PullableScrollView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public PullableScrollView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
public boolean canPullDown() {
if (getScrollY() == 0)
return true;
else
return false;
}
@Override
public boolean canPullUp() {
if (getScrollY() >= (getChildAt(0).getHeight() - getMeasuredHeight()))
return true;
else
return false;
}
}
WebView
public class PullableWebView extends WebView implements Pullable {
public PullableWebView(Context context) {
super(context);
}
public PullableWebView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public PullableWebView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
public boolean canPullDown() {
if (getScrollY() == 0)
return true;
else
return false;
}
@Override
public boolean canPullUp() {
if (getScrollY() >= getContentHeight() * getScale()
- getMeasuredHeight())
return true;
else
return false;
}
}
ImageView
public class PullableImageView extends ImageView implements Pullable
{
public PullableImageView(Context context)
{
super(context);
}
public PullableImageView(Context context, AttributeSet attrs)
{
super(context, attrs);
}
public PullableImageView(Context context, AttributeSet attrs, int defStyle)
{
super(context, attrs, defStyle);
}
@Override
public boolean canPullDown()
{
return true;
}
@Override
public boolean canPullUp()
{
return true;
}
}
TextView
public class PullableTextView extends TextView implements Pullable {
public PullableTextView(Context context) {
super(context);
}
public PullableTextView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public PullableTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
public boolean canPullDown() {
return true;
}
@Override
public boolean canPullUp() {
return true;
}
}
4.使用示例(以ListView為例)
<view.PullToRefreshLayout
android:id="@+id/ptrl"
android:layout_width="match_parent"
android:layout_height="match_parent">
<include layout="@layout/head" />
<view.PullableListView
android:id="@+id/plv"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<include layout="@layout/foot" />
</view.PullToRefreshLayout>
head
<?xml version="1.0" encoding="UTF-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/head_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/darker_gray">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:paddingBottom="20dp"
android:paddingTop="20dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerInParent="true">
<ImageView
android:id="@+id/iv_head"
android:layout_width="20dp"
android:layout_height="20dp"
android:layout_centerVertical="true"
android:layout_marginLeft="60dp"
android:scaleType="fitXY" />
<TextView
android:id="@+id/tv_head"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:textColor="@android:color/white"
android:textSize="16sp" />
</RelativeLayout>
</RelativeLayout>
</RelativeLayout>
foot
<?xml version="1.0" encoding="UTF-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/loadmore_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/darker_gray">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:paddingBottom="20dp"
android:paddingTop="20dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerInParent="true">
<ImageView
android:id="@+id/iv_foot"
android:layout_width="20dp"
android:layout_height="20dp"
android:layout_centerVertical="true"
android:layout_marginLeft="60dp"
android:scaleType="fitXY" />
<TextView
android:id="@+id/tv_foot"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:textColor="@android:color/white"
android:textSize="16sp" />
</RelativeLayout>
</RelativeLayout>
</RelativeLayout>
4.注意
自定義的View跟正常的View的使用沒有什么差別
如需實(shí)現(xiàn)刷新加載，必須使ptrl.setOnRefreshListener(PullToRefreshLayout.OnRefreshListener onRefreshListener);
以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。
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