Activity实现下拉刷新
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2022-06-04 15:51:14
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一般的下拉刷新都只实现了刷新ListView，本demo实现了刷新普通Activity
RefreshScrollActivity.java:
package com.nono.refreshDemo;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.widget.Toast;
/**
*
* @author Nono
*
*/
public class RefreshScrollActivity extends Activity implements
RefreshableView.RefreshListener {
/** Called when the activity is first created. */
private RefreshableView mRefreshableView;
private Context mContext;
Handler handler = new Handler() {
public void handleMessage(Message message) {
super.handleMessage(message);
mRefreshableView.finishRefresh();
Toast.makeText(mContext, R.string.toast_text, Toast.LENGTH_SHORT).show();
};
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mContext = this;
init();
}
private void init() {
// TODO Auto-generated method stub
initView();
}
private void initView() {
// TODO Auto-generated method stub
mRefreshableView = (RefreshableView) findViewById(R.id.refresh_root);
initData();
}
private void initData() {
mRefreshableView.setRefreshListener(this);
}
//实现刷新RefreshListener 中方法
public void onRefresh(RefreshableView view) {
//伪处理
handler.sendEmptyMessageDelayed(1, 2000);
}
}
RefreshableView.java:
package com.nono.refreshDemo;
import java.util.Calendar;
import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.ScrollView;
import android.widget.Scroller;
import android.widget.TextView;
/**
* 刷新控制view
*
* @author Nono
*
*/
public class RefreshableView extends LinearLayout {
private static final String TAG = "LILITH";
private Scroller scroller;
private View refreshView;
private ImageView refreshIndicatorView;
private int refreshTargetTop = -60;
private ProgressBar bar;
private TextView downTextView;
private TextView timeTextView;
private LinearLayout reFreshTimeLayout;//显示上次刷新时间的layout
private RefreshListener refreshListener;
private String downTextString;
private String releaseTextString;
// private Long refreshTime = null;
private int lastX;
private int lastY;
// 拉动标记
private boolean isDragging = false;
// 是否可刷新标记
private boolean isRefreshEnabled = true;
// 在刷新中标记
private boolean isRefreshing = false;
Calendar LastRefreshTime;
private Context mContext;
public RefreshableView(Context context) {
super(context);
mContext = context;
}
public RefreshableView(Context context, AttributeSet attrs) {
super(context, attrs);
mContext = context;
init();
}
private void init() {
// TODO Auto-generated method stub
//滑动对象，
LastRefreshTime=Calendar.getInstance();
scroller = new Scroller(mContext);
//刷新视图顶端的的view
refreshView = LayoutInflater.from(mContext).inflate(R.layout.refresh_top_item, null);
//指示器view
refreshIndicatorView = (ImageView) refreshView.findViewById(R.id.indicator);
//刷新bar
bar = (ProgressBar) refreshView.findViewById(R.id.progress);
//下拉显示text
downTextView = (TextView) refreshView.findViewById(R.id.refresh_hint);
//下来显示时间
timeTextView = (TextView) refreshView.findViewById(R.id.refresh_time);
reFreshTimeLayout=(LinearLayout)refreshView.findViewById(R.id.refresh_time_layout);
LayoutParams lp = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, -refreshTargetTop);
lp.topMargin = refreshTargetTop;
lp.gravity = Gravity.CENTER;
addView(refreshView, lp);
downTextString = mContext.getResources().getString(R.string.refresh_down_text);
releaseTextString = mContext.getResources().getString(R.string.refresh_release_text);
}
/**
* 设置上次刷新时间
* @param time
*/
private void setLastRefreshTimeText() {
// TODO Auto-generated method stub
reFreshTimeLayout.setVisibility(View.VISIBLE);
Calendar NowTime=Calendar.getInstance();
long l=NowTime.getTimeInMillis()-LastRefreshTime.getTimeInMillis();
int days=new Long(l/(1000*60*60*24)).intValue();
int hour=new Long(l/(1000*60*60)).intValue();
int min=new Long(l/(1000*60)).intValue();
if(days!=0)
{
timeTextView.setText(days+"天");
}
else if(hour!=0)
{
timeTextView.setText(hour+"小时");
}
else if(min!=0)
{
timeTextView.setText(min+"分钟");
}
//timeTextView.setText(time);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
int y= (int) event.getRawY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
//记录下y坐标
lastY = y;
break;
case MotionEvent.ACTION_MOVE:
Log.i(TAG, "ACTION_MOVE");
//y移动坐标
int m = y - lastY;
if(((m < 6) && (m > -1)) || (!isDragging )){
setLastRefreshTimeText();
doMovement(m);
}
//记录下此刻y坐标
this.lastY = y;
break;
case MotionEvent.ACTION_UP:
Log.i(TAG, "ACTION_UP");
fling();
break;
}
return true;
}
/**
* up事件处理
*/
private void fling() {
// TODO Auto-generated method stub
LinearLayout.LayoutParams lp = (LayoutParams) refreshView.getLayoutParams();
Log.i(TAG, "fling()" + lp.topMargin);
if(lp.topMargin > 0){//拉到了触发可刷新事件
refresh();
}else{
returnInitState();
}
}
private void returnInitState() {
// TODO Auto-generated method stub
LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams)this.refreshView.getLayoutParams();
int i = lp.topMargin;
scroller.startScroll(0, i, 0, refreshTargetTop);
invalidate();
}
private void refresh() {
// TODO Auto-generated method stub
LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams)this.refreshView.getLayoutParams();
int i = lp.topMargin;
reFreshTimeLayout.setVisibility(View.GONE);
refreshIndicatorView.setVisibility(View.GONE);
bar.setVisibility(View.VISIBLE);
timeTextView.setVisibility(View.GONE);
downTextView.setVisibility(View.GONE);
scroller.startScroll(0, i, 0, 0-i);
invalidate();
if(refreshListener !=null){
refreshListener.onRefresh(this);
isRefreshing = true;
}
}
/**
*
*/
@Override
public void computeScroll() {
// TODO Auto-generated method stub
if(scroller.computeScrollOffset()){
int i = this.scroller.getCurrY();
LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams)this.refreshView.getLayoutParams();
int k = Math.max(i, refreshTargetTop);
lp.topMargin = k;
this.refreshView.setLayoutParams(lp);
this.refreshView.invalidate();
invalidate();
}
}
/**
* 下拉move事件处理
* @param moveY
*/
private void doMovement(int moveY) {
// TODO Auto-generated method stub
LinearLayout.LayoutParams lp = (LayoutParams) refreshView.getLayoutParams();
if(moveY>0){
//获取view的上边距
float f1 =lp.topMargin;
float f2 = moveY * 0.3F;
int i = (int)(f1+f2);
//修改上边距
lp.topMargin = i;
//修改后刷新
refreshView.setLayoutParams(lp);
refreshView.invalidate();
invalidate();
}
else
{
float f1 =lp.topMargin;
int i=(int)(f1+moveY*0.9F);
Log.i("aa", String.valueOf(i));
if(i>=refreshTargetTop)
{
lp.topMargin = i;
//修改后刷新
refreshView.setLayoutParams(lp);
refreshView.invalidate();
invalidate();
}
else
{
}
}
timeTextView.setVisibility(View.VISIBLE);
// if(refreshTime!= null){
// setRefreshTime(refreshTime);
// }
downTextView.setVisibility(View.VISIBLE);
refreshIndicatorView.setVisibility(View.VISIBLE);
bar.setVisibility(View.GONE);
if(lp.topMargin > 0){
downTextView.setText(R.string.refresh_release_text);
refreshIndicatorView.setImageResource(R.drawable.refresh_arrow_up);
}else{
downTextView.setText(R.string.refresh_down_text);
refreshIndicatorView.setImageResource(R.drawable.refresh_arrow_down);
}
}
public void setRefreshEnabled(boolean b) {
this.isRefreshEnabled = b;
}
public void setRefreshListener(RefreshListener listener) {
this.refreshListener = listener;
}
/**
* 结束刷新事件
*/
public void finishRefresh(){
Log.i(TAG, "执行了=====finishRefresh");
LinearLayout.LayoutParams lp= (LinearLayout.LayoutParams)this.refreshView.getLayoutParams();
int i = lp.topMargin;
refreshIndicatorView.setVisibility(View.VISIBLE);
timeTextView.setVisibility(View.VISIBLE);
scroller.startScroll(0, i, 0, refreshTargetTop);
invalidate();
isRefreshing = false;
LastRefreshTime=Calendar.getInstance();
}
/*该方法一般和ontouchEvent 一起用
* (non-Javadoc)
* @see android.view.ViewGroup#onInterceptTouchEvent(android.view.MotionEvent)
*/
@Override
public boolean onInterceptTouchEvent(MotionEvent e) {
// TODO Auto-generated method stub
int action = e.getAction();
int y= (int) e.getRawY();
switch (action) {
case MotionEvent.ACTION_DOWN:
lastY = y;
break;
case MotionEvent.ACTION_MOVE:
//y移动坐标
int m = y - lastY;
//记录下此刻y坐标
this.lastY = y;
if(m > 6 && canScroll()){
return true;
}
break;
case MotionEvent.ACTION_UP:
break;
case MotionEvent.ACTION_CANCEL:
break;
}
return false;
}
private boolean canScroll() {
// TODO Auto-generated method stub
View childView;
if(getChildCount()>1){
childView = this.getChildAt(1);
if(childView instanceof ListView){
int top =((ListView)childView).getChildAt(0).getTop();
int pad =((ListView)childView).getListPaddingTop();
if((Math.abs(top-pad)) < 3&&
((ListView) childView).getFirstVisiblePosition() == 0){
return true;
}else{
return false;
}
}else if(childView instanceof ScrollView){
if(((ScrollView)childView).getScrollY() == 0){
return true;
}else{
return false;
}
}
}
return false;
}
/**
* 刷新监听接口
* @author Nono
*
*/
public interface RefreshListener{
public void onRefresh(RefreshableView view);
}
}
main.xml:
<?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:background="@drawable/app_bg"
android:orientation="vertical" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="10dip"
android:gravity="center"
android:text="@string/hello"
android:textColor="@color/black" />
<com.nono.refreshDemo.RefreshableView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/refresh_root"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<ScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/scroll_view_root"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<LinearLayout
android:id="@+id/linear_root"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center"
android:orientation="vertical" >
<TextView
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:background="@drawable/item_bg"
android:gravity="center"
android:text="第一行哈哈哈哈哈哈"
android:textColor="@color/black"
android:textSize="30sp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:background="@drawable/item_bg"
android:gravity="center"
android:text="第二行哈哈哈哈哈哈"
android:textColor="@color/black"
android:textSize="30sp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:background="@drawable/item_bg"
android:gravity="center"
android:text="第三行哈哈哈哈哈哈"
android:textColor="@color/black"
android:textSize="30sp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:background="@drawable/item_bg"
android:gravity="center"
android:text="第四行哈哈哈哈哈哈"
android:textColor="@color/black"
android:textSize="30sp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:background="@drawable/item_bg"
android:gravity="center"
android:text="第五行哈哈哈哈哈哈"
android:textColor="@color/black"
android:textSize="30sp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:background="@drawable/item_bg"
android:gravity="center"
android:text="第六行哈哈哈哈哈哈"
android:textColor="@color/black"
android:textSize="30sp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:background="@drawable/item_bg"
android:gravity="center"
android:text="第七行哈哈哈哈哈哈"
android:textColor="@color/black"
android:textSize="30sp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:background="@drawable/item_bg"
android:gravity="center"
android:text="第八行哈哈哈哈哈哈"
android:textColor="@color/black"
android:textSize="30sp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:background="@drawable/item_bg"
android:gravity="center"
android:text="第九行哈哈哈哈哈哈"
android:textColor="@color/black"
android:textSize="30sp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:background="@drawable/item_bg"
android:gravity="center"
android:text="第十行哈哈哈哈哈哈"
android:textColor="@color/black"
android:textSize="30sp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:background="@drawable/item_bg"
android:gravity="center"
android:text="第十行哈哈哈哈哈哈"
android:textColor="@color/black"
android:textSize="30sp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:background="@drawable/item_bg"
android:gravity="center"
android:text="第十行哈哈哈哈哈哈"
android:textColor="@color/black"
android:textSize="30sp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:background="@drawable/item_bg"
android:gravity="center"
android:text="第十行哈哈哈哈哈哈"
android:textColor="@color/black"
android:textSize="30sp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:background="@drawable/item_bg"
android:gravity="center"
android:text="第十行哈哈哈哈哈哈"
android:textColor="@color/black"
android:textSize="30sp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:background="@drawable/item_bg"
android:gravity="center"
android:text="第十行哈哈哈哈哈哈"
android:textColor="@color/black"
android:textSize="30sp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:background="@drawable/item_bg"
android:gravity="center"
android:text="第十行哈哈哈哈哈哈"
android:textColor="@color/black"
android:textSize="30sp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:background="@drawable/item_bg"
android:gravity="center"
android:text="第十行哈哈哈哈哈哈"
android:textColor="@color/black"
android:textSize="30sp" />
</LinearLayout>
</ScrollView>
</com.nono.refreshDemo.RefreshableView>
</LinearLayout>
refresh_top_item.xml:
<?xml version="1.0" encoding="utf-8"?> <!-- android:layout_marginTop="-50.0dip"隐藏 --> <LinearLayout android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="50.0dip" android:layout_marginTop="-50.0dip" xmlns:android="http://schemas.android.com/apk/res/android"> <RelativeLayout android:layout_width="fill_parent" android:layout_height="fill_parent" > <ImageView android:id="@+id/indicator" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerVertical="true" android:layout_marginLeft="20dp" android:src="@drawable/refresh_arrow_down" /> <LinearLayout android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_centerInParent="true" android:gravity="center" android:orientation="vertical" > <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:gravity="center" android:orientation="horizontal" > <ProgressBar android:id="@+id/progress" style="?android:attr/progressBarStyleSmall" android:layout_width="wrap_content" android:layout_height="wrap_content" android:indeterminateBehavior="repeat" android:max="10000" android:visibility="gone" /> <TextView android:id="@+id/refresh_hint" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="5.0dip" android:gravity="center_vertical" android:text="松开手指刷新" android:textSize="14.0sp" /> </LinearLayout> <LinearLayout android:id="@+id/refresh_time_layout" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginBottom="5dp" android:layout_marginTop="3dp" > <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:gravity="center_vertical" android:text="上次刷新时间:" android:textSize="10sp" /> <TextView android:id="@+id/refresh_time" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="0分钟" android:textSize="10sp" /> <TextView android:id="@+id/textView2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="前" android:textSize="10sp" /> </LinearLayout> </LinearLayout> <View android:layout_width="fill_parent" android:layout_height="5dp" android:layout_alignParentBottom="true" android:background="#ffc8b67a" /> </RelativeLayout> </LinearLayout>