設置向下拉動更新。
package com.mycompany.Scroll_test; import android.app.*;
import android.os.*;
import android.view.*;
import android.widget.*; /**
* 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 RefreshListener refreshListener; private String downTextString;
private String releaseTextString; private Long refreshTime = null;
private int lastX;
private int lastY;
// 拉動標記
private boolean isDragging = false;
// 是否可刷新標記
private boolean isRefreshEnabled = true;
// 在刷新中標記
private boolean isRefreshing = false; 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
//滑動對象，
scroller = new Scroller(mContext); //刷新視圖頂端的的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);
//下拉顯示text
downTextView = (TextView) refreshView.findViewById(R.id.refresh_hint);
//下來顯示時間
timeTextView = (TextView) refreshView.findViewById(R.id.refresh_time); 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);
} /**
* 刷新
* @param time
*/
private void setRefreshText(String time) {
// TODO Auto-generated method stub
//timeTextView.setText(time);
} @Override
public boolean onTouchEvent(MotionEvent event) { int y= (int) event.getRawY(); switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
//記錄下y坐標
lastY = y;
break; case MotionEvent.ACTION_MOVE:
Log.i(TAG, "ACTION_MOVE");
//y移動坐標
int m = y - lastY;
if(((m < 6) && (m > -1)) || (!isDragging )){
doMovement(m);
}
//記錄下此刻y坐標
this.lastY = y;
break; case MotionEvent.ACTION_UP:
Log.i(TAG, "ACTION_UP"); fling(); break;
}
return true;
} /**
* up事件處理
*/
private void fling() {
// TODO Auto-generated method stub
LinearLayout.LayoutParams lp = (LayoutParams) refreshView.getLayoutParams();
Log.i(TAG, "fling()" + lp.topMargin);
if(lp.topMargin > 0){//拉到了觸發可刷新事件
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;
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事件處理
* @param moveY
*/
private void doMovement(int moveY) {
// TODO Auto-generated method stub
LinearLayout.LayoutParams lp = (LayoutParams) refreshView.getLayoutParams();
if(moveY > 0){
//獲取view的上邊距
float f1 =lp.topMargin;
float f2 = moveY * 0.3F;
int i = (int)(f1+f2);
//修改上邊距
lp.topMargin = i;
//修改後刷新
refreshView.setLayoutParams(lp);
refreshView.invalidate();
invalidate();
}
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;
} /**
* 刷新時間
* @param refreshTime2
*/
private void setRefreshTime(Long time) {
// TODO Auto-generated method stub } /**
* 結束刷新事件
*/
public void finishRefresh(){
Log.i(TAG, "執行了=====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;
} /*該方法一般和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移動坐標
int m = y - lastY; //記錄下此刻y坐標
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;
}
/**
* 刷新監聽接口
* @author Nono
*
*/
public interface RefreshListener{
public void onRefresh(RefreshableView view);
}}