下拉刷新和加载更多

示例

/***************************PFView.java*********************************/

/**
* 2013-9-21 下午11:12:45 Created By niexiaoqiang
*/

package com.xiaoqiang.m;

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.Locale;

import android.content.Context;
import android.database.DataSetObserver;
import android.graphics.Color;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.animation.LinearInterpolator;
import android.view.animation.RotateAnimation;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.ScrollView;
import android.widget.TextView;

/**
* 1.下拉刷新及加载更多 2.实例控件后需要对设置FPAdapter和PFListener
* 3.如果没有加载到数据，或者其他错误对FPAdaptersetNoda_tip(String noda_tip, boolean
* isclearallview)信息，在onmore时isclearallview为TRUE，onfresh时候为isclearallview为false
* 4.onePagenum控制一页显示多少数据，向服务器递交分页大小
*/
public class PFView extends ScrollView implements OnTouchListener {

/************************** 对外使用这些方法就足够了 **************************************/
/**
* 初始化加载数据调用该方法，触发监听器中的onload方法
*/
public void loadData() {
if (null != pfListener) {
clearAllview();
// 初始化的时候显示正在初始化
current_state = constant.refrushState.LOADING;
changeHeaderViewByState(current_state);
pfListener.onLoad();
}
}

/**
* 设置设配器
*
* @param pullRefreshAdapter
*/
public void setPFAdapter(PFAdapter pfAdapter) {
this.pfAdapter = pfAdapter;
pfAdapter.registerDataSetObserver(dataSetObserver);
}

/**
* 设置监听器
*
* @param pullRefreshListener
*/
public void setPullRefreshListener(PFListener pullRefreshListener) {
this.pfListener = pullRefreshListener;
}

/**
* 监听器
*
* @author niexiaoq
*
*/
public interface PFListener {
/**
* 下拉刷新
*/
public void onRefresh();

/**
* 加载数据
*/
public void onLoad();

/**
* 更多
*/
public void onMore();
}

/************************** 对外使用这些方法就足够了 **************************************/

/******************************** 更多 ************************************/
private int onePagenum = 20;

/******************************** 更多 ************************************/

/**
* 清除加载进来的所有view,头部不会被清理
*/
private void clearAllview() {
ArrayList<View> currentviews = new ArrayList<View>();
for (int i = 0; i < contentLayout.getChildCount(); i++) {
currentviews.add(contentLayout.getChildAt(i));
}
for (int i = 0; i < currentviews.size(); i++) {
View child = currentviews.get(i);
if (pf_header == child) {
continue;
}
try {
contentLayout.removeView(currentviews.get(i));
}
catch (Exception e) {
throw new RuntimeException(e);
}
}
}

/*********************** 滑动相关 ***************/
private int touch_down_y = 0;
private int touch_move_y = 0;
private int touch_down_distance = 0;
private int touch_down_total_distance = 0;
private int pulldown_speed = 2;
private boolean isBack = false;
private boolean isError_topull = false;
private int current_state = constant.refrushState.LOADING;
private PFListener pfListener = null;
private PFAdapter pfAdapter = null;

/*********************** 滑动相关 ***************/
@Override
public boolean onTouch(View v, MotionEvent event) {
this.sv_scrollto(event);
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
touch_down_y = (int) event.getY();
touch_down_distance = 0;
break;
case MotionEvent.ACTION_MOVE:
touch_move_y = (int) event.getY();
if (touch_down_y == 0) {
touch_down_y = touch_move_y;
touch_down_distance = 0;
}
touch_down_distance = touch_move_y - touch_down_y;
touch_down_y = touch_move_y;
pulldown(touch_down_distance);
break;
case MotionEvent.ACTION_UP:
touch_down_y = 0;
touch_down_distance = 0;
touch_down_total_distance = 0;
if (current_state != constant.refrushState.REFRESHING && current_state != constant.refrushState.LOADING && current_state != constant.refrushState.ONMORE) {
if (current_state == constant.refrushState.DONE) {
}
if (current_state == constant.refrushState.PULL_To_REFRESH) {
if (isError_topull) {
isError_topull = false;
current_state = constant.refrushState.ERROR;
} else {
current_state = constant.refrushState.DONE;
}
changeHeaderViewByState(current_state);
}
if (current_state == constant.refrushState.RELEASE_To_REFRESH) {
current_state = constant.refrushState.REFRESHING;
changeHeaderViewByState(current_state);
if (null != pfListener) {
pfListener.onRefresh();
}
}
}
break;
default:
break;
}
return true;
}

/************* 滚动定义 ****************/
private int sv_starty = 0;
private int sv_downy = 0;
private int sv_max_scrolly = 0;

/*************** 滚动定义 **************/
/**
* 滚动
*
* @param y
*/
private void sv_scrollto(MotionEvent event) {
sv_max_scrolly = contentLayout.getHeight() - PFView.this.getHeight();
int instatnce_y = 0;
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
sv_starty = (int) event.getY();
break;
case MotionEvent.ACTION_MOVE:
sv_downy = (int) event.getY();
instatnce_y = sv_downy - sv_starty;
sv_starty = sv_downy;
break;
case MotionEvent.ACTION_UP:
sv_downy = (int) event.getY();
break;
default:
break;
}
int current_y = getScrollY();
// 只能向上
if (current_y <= 0) {
if (instatnce_y > 0) {
return;
} else {
this.scrollTo(0, current_y - instatnce_y);
}
} else if (current_y >= sv_max_scrolly) {
if (instatnce_y < 0) {
return;
} else {
this.scrollTo(0, current_y - instatnce_y);
}
} else {
this.scrollTo(0, current_y - instatnce_y);
}
}

/**
* 下拉
*
* @param distance
*/
private void pulldown(int distance) {
if (current_state == constant.refrushState.REFRESHING || current_state == constant.refrushState.LOADING || current_state == constant.refrushState.ONMORE) {
return;
}
// PULL_To_REFRESH状态下
if (current_state == constant.refrushState.PULL_To_REFRESH) {
// 下拉到可以进入RELEASE_TO_REFRESH的状态
if (touch_down_total_distance >= HeaderViewHeight) {
current_state = constant.refrushState.RELEASE_To_REFRESH;
isBack = true;
changeHeaderViewByState(current_state);
}
// 上推到顶了
else if (touch_down_total_distance <= 0) {
current_state = constant.refrushState.DONE;
changeHeaderViewByState(current_state);
}
}
// RELEASE_To_REFRESH状态下
if (current_state == constant.refrushState.RELEASE_To_REFRESH) {
if (touch_down_total_distance < HeaderViewHeight && touch_down_total_distance > 0) {
current_state = constant.refrushState.PULL_To_REFRESH;
changeHeaderViewByState(current_state);
}
// 一下子推到顶了
else if (touch_down_total_distance <= 0) {
current_state = constant.refrushState.DONE;
changeHeaderViewByState(current_state);
}
}
// done状态下
if (current_state == constant.refrushState.DONE || current_state == constant.refrushState.ERROR) {
if (current_state == constant.refrushState.ERROR) {
isError_topull = true;
touch_down_total_distance = HeaderViewHeight;
}
if (distance > 0) {
current_state = constant.refrushState.PULL_To_REFRESH;
changeHeaderViewByState(current_state);
}
}
// 累加总长度
touch_down_total_distance += distance / pulldown_speed;
// 更新headView的size
if (current_state == constant.refrushState.PULL_To_REFRESH) {
pf_header.setPadding(0, -1 * HeaderViewHeight + touch_down_total_distance, 0, 0);

}
// 更新headView的paddingTop
if (current_state == constant.refrushState.RELEASE_To_REFRESH) {
pf_header.setPadding(0, touch_down_total_distance - HeaderViewHeight, 0, 0);
}
}

/**
* 刷新完成，或初始化加载完成时，调用
*/
private void onRefresh_LoadingComplete(boolean isscrolltotop) {
current_state = constant.refrushState.DONE;
Date date = new Date();
pf_header_refreshtime.setText("最近更新:" + new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.CHINA).format(date));
changeHeaderViewByState(current_state);
this.invalidate();
if (isscrolltotop) {
scrollTo(0, 0);
}
}

/**
* 刷新完成，但加载失败，可能是网络或者其他错误，予以提示，数据从适配器中来
*/
private void onRefresh_Error(String errortip) {
this.errortip = errortip;
current_state = constant.refrushState.ERROR;
Date date = new Date();
pf_header_refreshtime.setText("最近更新:" + new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.CHINA).format(date));
changeHeaderViewByState(current_state);
this.invalidate();
scrollTo(0, 0);
}

/************** 构造函数及其他方法 ***************/
/******************* 关于头部文件 ********************/
private LinearLayout contentLayout = null;
/**
* 头部
*/
private LinearLayout pf_header = null;
/**
* 头部下拉记载刷新箭头
*/
private ImageView pf_header_ico_view = null;
/**
* 头部下拉刷新进度条
*/
private ProgressBar pf_header_progressbar = null;

/**
* 头部显示更新时间
*/
private TextView pf_header_refreshtime = null;
/**
* 头部提示文字
*/
private TextView pf_header_pullnote = null;

private int HeaderViewHeight = 150;

/*** 旋转动画 **********/
private RotateAnimation animation;

private RotateAnimation reverseAnimation;

private String errortip = "";

/**
* 更多按钮
*/
private Button morebutton;

/******************* 关于头部文件 ********************/

public PFView(Context context, AttributeSet attrs) {
super(context, attrs);
this.init(context);
}

public PFView(Context context) {
super(context);
this.init(context);
}

public PFView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
this.init(context);
}

/**
* 初始化
*
* @param context
*/
private void init(Context context) {
/****** 内容容器 *********/
contentLayout = new LinearLayout(context);
contentLayout.setOrientation(LinearLayout.VERTICAL);
this.setOnTouchListener(this);
this.addView(contentLayout, new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
/****** 内容容器 *********/
/****** 头部初始化 *********/
pf_header = (LinearLayout) GetPartView(context, R.layout.pf_header);
pf_header.setPadding(0, -1 * HeaderViewHeight, 0, 0);
pf_header.invalidate();
contentLayout.addView(pf_header, new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));
pf_header_ico_view = (ImageView) pf_header.findViewById(R.id.pf_header_ico_view);
pf_header_progressbar = (ProgressBar) pf_header.findViewById(R.id.pf_header_progressbar);
pf_header_pullnote = (TextView) pf_header.findViewById(R.id.pf_header_pullnote);
pf_header_refreshtime = (TextView) pf_header.findViewById(R.id.pf_header_refreshtime);
/****** 头部初始化 *********/
/************* 动画初始化 ***************/
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);
/************* 动画初始化 ***************/
morebutton = new Button(context);
morebutton.setText("更多...");
morebutton.setTextColor(Color.BLACK);
morebutton.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));
morebutton.setGravity(Gravity.CENTER);
morebutton.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
if (null != pfListener) {
if (current_state == constant.refrushState.DONE) {
current_state = constant.refrushState.ONMORE;
pfListener.onMore();
}
}
}
});
}

@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
this.onTouch(this, ev);
return false;
}

/**
* 获取部分UI
*
* @param context
* @param resourceId
* @return
*/
private View GetPartView(Context context, int resourceId) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
return inflater.inflate(resourceId, null);
}

/************** 构造函数及其他方法 ****************/

/**
* 当状态改变时候，调用该方法，以更新界面
*/
private void changeHeaderViewByState(int state) {
switch (state) {
case constant.refrushState.RELEASE_To_REFRESH:
pf_header_ico_view.setVisibility(View.VISIBLE);
pf_header_progressbar.setVisibility(View.GONE);
pf_header_pullnote.setVisibility(View.VISIBLE);
pf_header_refreshtime.setVisibility(View.VISIBLE);
pf_header_ico_view.clearAnimation();
pf_header_ico_view.startAnimation(animation);
pf_header_pullnote.setText("松开刷新");
break;
case constant.refrushState.PULL_To_REFRESH:
pf_header_progressbar.setVisibility(View.GONE);
pf_header_pullnote.setVisibility(View.VISIBLE);
pf_header_refreshtime.setVisibility(View.VISIBLE);
pf_header_ico_view.clearAnimation();
pf_header_ico_view.setVisibility(View.VISIBLE);
// 是由RELEASE_To_REFRESH状态转变来的
if (isBack) {
isBack = false;
pf_header_ico_view.clearAnimation();
pf_header_ico_view.startAnimation(reverseAnimation);
pf_header_pullnote.setText("下拉刷新");
} else {
pf_header_pullnote.setText("下拉刷新");
}
break;
case constant.refrushState.REFRESHING:
pf_header.setPadding(0, 0, 0, 0);
pf_header_progressbar.setVisibility(View.VISIBLE);
pf_header_ico_view.clearAnimation();
pf_header_ico_view.setVisibility(View.GONE);
pf_header_pullnote.setText("正在刷新...");
pf_header_refreshtime.setVisibility(View.VISIBLE);
morebutton.setText("更多...");
break;
case constant.refrushState.LOADING:
pf_header.setPadding(0, 0, 0, 0);
pf_header_progressbar.setVisibility(View.VISIBLE);
pf_header_ico_view.clearAnimation();
pf_header_ico_view.setVisibility(View.GONE);
pf_header_pullnote.setText("正在初始化...");
pf_header_refreshtime.setVisibility(View.GONE);
morebutton.setText("更多...");
break;
case constant.refrushState.DONE:
pf_header.setPadding(0, -1 * HeaderViewHeight, 0, 0);
pf_header_progressbar.setVisibility(View.GONE);
pf_header_ico_view.clearAnimation();
pf_header_ico_view.setImageResource(R.drawable.pf_header_down_ico);
pf_header_pullnote.setText("下拉刷新");
pf_header_refreshtime.setVisibility(View.VISIBLE);
break;
case constant.refrushState.ERROR:
pf_header.setPadding(0, 0, 0, 0);
pf_header_progressbar.setVisibility(View.GONE);
pf_header_ico_view.clearAnimation();
pf_header_ico_view.setVisibility(View.GONE);
pf_header_pullnote.setText(errortip);
pf_header_refreshtime.setVisibility(View.VISIBLE);
morebutton.setText("更多...");
break;
}
}

/**
* 常量
*
* @author niexiaoq
*/
public static class constant {

/**
* 状态
*
* @author niexiaoq
*/
public static class refrushState {
public final static int ERROR = -1;

public final static int RELEASE_To_REFRESH = 0;

public final static int PULL_To_REFRESH = 1;

public final static int REFRESHING = 2;

public final static int DONE = 3;

public final static int LOADING = 4;

public final static int ONMORE = 5;
}

/**
* 数据行的布局参数
*/
public final static LinearLayout.LayoutParams dataViewParas = new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
}

/**
* 调用pullRefreshAdapter。notifyDataSetChanged() 通知发生更改； dataSetObserver开始动作，
*/
private DataSetObserver dataSetObserver = new DataSetObserver() {
@Override
public void onChanged() {
super.onChanged();
if (current_state == constant.refrushState.ONMORE) {
if (pfAdapter.isSucess()) {
// 清除最后一个控件
contentLayout.removeViewAt(contentLayout.getChildCount() - 1);
// 追加 ps:移除更多按钮和头部后，就是在加载更多之前的的数量
int current_total = contentLayout.getChildCount() - 1;
ArrayList<? extends View> list = pfAdapter.getAllview();
// list需要大于当前的数量，加载更多才成功了，否则失败，或者没有更多数据，同样可以获取TIP信息
if (list.size() > current_total) {
for (int i = current_total; i < list.size(); i++) {
contentLayout.addView(list.get(i), constant.dataViewParas);
}
}
// 不添加更多按钮
if (pfAdapter.isMoredata()) {
morebutton.setText("更多...");
contentLayout.addView(morebutton, constant.dataViewParas);
}
} else {
morebutton.setText(pfAdapter.getErrortip());
contentLayout.addView(morebutton, constant.dataViewParas);
}
onRefresh_LoadingComplete(false);
} else {
if (pfAdapter.isSucess()) {
clearAllview();
ArrayList<? extends View> list = pfAdapter.getAllview();
if (list.size() > 0) {
for (View view : list) {
contentLayout.addView(view, constant.dataViewParas);
}
if (list.size() >= onePagenum && pfAdapter.isMoredata()) {
// 添加跟过按钮
contentLayout.addView(morebutton, constant.dataViewParas);
}
onRefresh_LoadingComplete(true);
} else {
onRefresh_Error(pfAdapter.getErrortip());
}
} else {
onRefresh_Error(pfAdapter.getErrortip());
}
}
}
};

}

/**********************PFAdapter.java****************/

/**
* 2013-8-2 上午9:36:42 Created By niexiaoqiang
*/

package com.xiaoqiang.m;

import java.util.ArrayList;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;

/**
* TODO Add Class Description
*/
public class PFAdapter extends BaseAdapter {
private ArrayList<? extends View> allView;
private boolean sucess = false;
private boolean moredata = true;
private String errortip = "";

public PFAdapter(Context context, ArrayList<? extends View> allView) {
this.allView = allView;
}

@Override
public int getCount() {
return allView.size();
}

@Override
public Object getItem(int postion) {
return allView.get(postion);
}

@Override
public long getItemId(int postion) {
return 0;
}

@Override
public View getView(int postion, View arg1, ViewGroup arg2) {
return allView.get(postion);
}

public ArrayList<? extends View> getAllview() {
return allView;
}

public void notifyDataSetChanged(boolean sucess, boolean moredata, String errortip) {
this.sucess = sucess;
this.moredata = moredata;
this.errortip = errortip;
super.notifyDataSetChanged();
}

@Override
@Deprecated
public void notifyDataSetChanged() {
super.notifyDataSetChanged();
}

public boolean isSucess() {
return sucess;
}

public boolean isMoredata() {
return moredata;
}

public String getErrortip() {
return errortip;
}

}

/****************************************MainActivity.java****************************/

package com.xiaoqiang.m;

import java.util.ArrayList;

import android.app.Activity;
import android.content.Context;
import android.graphics.Color;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.Gravity;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;

import com.xiaoqiang.m.PFView.PFListener;

public class MainActivity extends Activity {

private PFView pfView = null;
private PFAdapter pfAdapter = null;
private ArrayList<View> arrayList = null;

private Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
Bundle bundle = msg.getData();
pfAdapter.notifyDataSetChanged(bundle.getBoolean("success"), bundle.getBoolean("moredate"), bundle.getString("errortip"));
}
};

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
pfView = (PFView) this.findViewById(R.id.m_pfview);
arrayList = new ArrayList<View>();
pfAdapter = new PFAdapter(this, arrayList);
pfView.setPFAdapter(pfAdapter);
pfView.setPullRefreshListener(new PFListener() {

@Override
public void onRefresh() {
new Thread(new Runnable() {
@Override
public void run() {
try {
Thread.sleep(2000);
arrayList.add(getItemView(MainActivity.this, arrayList.size()));
Message m = handler.obtainMessage(1);
Bundle bundle = new Bundle();
bundle.putBoolean("success", true);
bundle.putBoolean("moredate", true);
bundle.putString("errortip", "");
m.setData(bundle);
m.sendToTarget();
}
catch (Exception e) {
}
}
}).start();
}

@Override
public void onLoad() {
new Thread(new Runnable() {

@Override
public void run() {
try {
Thread.sleep(2000);
for (int i = 0; i < 21; i++) {
arrayList.add(getItemView(MainActivity.this, i));
}
Message m = handler.obtainMessage(1);
Bundle bundle = new Bundle();
bundle.putBoolean("success", true);
bundle.putBoolean("moredate", true);
bundle.putString("errortip", "");
m.setData(bundle);
m.sendToTarget();
}
catch (Exception e) {
}
}
}).start();

}

@Override
public void onMore() {
new Thread(new Runnable() {

@Override
public void run() {
try {
Thread.sleep(1000);
for (int i = 0; i < 10; i++) {
arrayList.add(getItemView(MainActivity.this, i));
}
Message m = handler.obtainMessage(1);
Bundle bundle = new Bundle();
bundle.putBoolean("success", true);
bundle.putBoolean("moredate", false);
bundle.putString("errortip", "");
m.setData(bundle);
m.sendToTarget();
}
catch (Exception e) {
}
}
}).start();

}
});

pfView.loadData();
}

private View getItemView(Context context, int i) {
LinearLayout linearLayout = new LinearLayout(context);
linearLayout.setBackgroundColor(Color.GREEN);
linearLayout.setGravity(Gravity.CENTER);
Button b = new Button(context);
b.setText("测试按钮" + i);
linearLayout.addView(b);
return linearLayout;
}
}

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