appItem.Id=imgg.getCommandId(); // set the app name appItem.mAppName.setText(imgg.getId()+""); //parent.invalidate(); //appItem.mAppIcon.setOnClickListener(new listener()); return convertView; } /** * * @author Yao.GUET * */ class AppItem { //ImageButton mAppIcon; ImageView mAppIcon; String name; String state; int Id; TextView mAppName; } } 这个就是继承了baseadapter的类,我觉得主要原因在这个类里
public AppAdapter(Context context, List<Image> list, int page) { mContext = context; mList = new ArrayList<Image>(); int i = page * APP_PAGE_SIZE; int iEnd = i+APP_PAGE_SIZE; while ((i<list.size())&&(i<iEnd)){ mList.add(list.get(i)); i++; } } 我觉得问题是在上面那个类的这个构造方法里
对,我也觉得是这个原因,就是不知道怎么解决,前两个对象要怎么调用 public void initViews() { // get all apps final List<Image> apps = list; // the total pages final int PageCount = (int)Math.ceil(apps.size()/APP_PAGE_SIZE); Log.e(TAG, "size:"+apps.size()+" page:"+PageCount); for (int i=0; i<PageCount; i++) { appPage = new GridView(this); // get the "i" page data app=new AppAdapter(this,apps,i); appPage.setAdapter(app); appPage.setNumColumns(4); appPage.setOnItemClickListener(listener); mScrollLayout.addView(appPage);
private int mCurScreen; private int mDefaultScreen = 0;
private static final int TOUCH_STATE_REST = 0; private static final int TOUCH_STATE_SCROLLING = 1;
private static final int SNAP_VELOCITY = 600;
private int mTouchState = TOUCH_STATE_REST; private int mTouchSlop; private float mLastMotionX; private float mLastMotionY; public ScrollLayout(Context context, AttributeSet attrs) {
this(context, attrs, 0); Log.v("1","ddd"); // TODO Auto-generated constructor stub } public ScrollLayout(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); Log.v("2","ddd"); // TODO Auto-generated constructor stub mScroller = new Scroller(context); mCurScreen = mDefaultScreen; mTouchSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop(); } @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { // TODO Auto-generated method stub Log.e(TAG, "onLayout"); //if (changed) { Log.v("3","ddd"); int childLeft = 0; final int childCount = getChildCount();
for (int i=0; i<childCount; i++) { final View childView = getChildAt(i); if (childView.getVisibility() != View.GONE) { final int childWidth = childView.getMeasuredWidth(); childView.layout(childLeft, 0, childLeft+childWidth, childView.getMeasuredHeight()); childLeft += childWidth;
}
//} } } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { Log.e(TAG, "onMeasure"); Log.v("4","ddd"); super.onMeasure(widthMeasureSpec, heightMeasureSpec); invalidate(); final int width = MeasureSpec.getSize(widthMeasureSpec); final int widthMode = MeasureSpec.getMode(widthMeasureSpec); if (widthMode != MeasureSpec.EXACTLY) { throw new IllegalStateException("ScrollLayout only canmCurScreen run at EXACTLY mode!"); }
final int heightMode = MeasureSpec.getMode(heightMeasureSpec); if (heightMode != MeasureSpec.EXACTLY) { throw new IllegalStateException("ScrollLayout only can run at EXACTLY mode!"); }
// The children are given the same width and height as the scrollLayout final int count = getChildCount(); for (int i = 0; i < count; i++) { getChildAt(i).measure(widthMeasureSpec, heightMeasureSpec); } // Log.e(TAG, "moving to screen "+mCurScreen); scrollTo(mCurScreen * width, 0);
}
/** * According to the position of current layout * scroll to the destination page. */ public void snapToDestination(){ Log.v("5","ddd"); final int screenWidth = getWidth(); final int destScreen = (getScrollX()+ screenWidth/2)/screenWidth; snapToScreen(destScreen); }
public void snapToScreen(int whichScreen) { Log.v("6","ddd"); // get the valid layout page whichScreen = Math.max(0, Math.min(whichScreen, getChildCount()-1)); if (getScrollX() != (whichScreen*getWidth())) {
final int delta = whichScreen*getWidth()-getScrollX(); mScroller.startScroll(getScrollX(), 0,delta, 0, Math.abs(delta)*2); mCurScreen = whichScreen; Log.v("aaa",mCurScreen+""); invalidate(); // Redraw the layout
@Override public void computeScroll(){ // TODO Auto-generated method stub Log.v("9","ddd"); if (mScroller.computeScrollOffset()) { scrollTo(mScroller.getCurrX(), mScroller.getCurrY()); postInvalidate(); } } @Override public boolean onTouchEvent(MotionEvent event) { Log.v("10","ddd"); // TODO Auto-generated method stub
if (mVelocityTracker == null) { mVelocityTracker = VelocityTracker.obtain(); } mVelocityTracker.addMovement(event);
final int action = event.getAction(); final float x = event.getX(); final float y = event.getY(); switch (action) { case MotionEvent.ACTION_DOWN: Log.e(TAG, "event down!"); if (!mScroller.isFinished()){ mScroller.abortAnimation(); //invalidate(); } mLastMotionX = x; break;
case MotionEvent.ACTION_MOVE: int deltaX = (int)(mLastMotionX - x); mLastMotionX = x;
scrollBy(deltaX, 0); break;
case MotionEvent.ACTION_UP: Log.e(TAG, "event : up"); // if (mTouchState == TOUCH_STATE_SCROLLING) { final VelocityTracker velocityTracker = mVelocityTracker; velocityTracker.computeCurrentVelocity(1000); int velocityX = (int) velocityTracker.getXVelocity(); Log.e(TAG, "velocityX:"+velocityX);
if (velocityX > SNAP_VELOCITY && mCurScreen > 0) { // Fling enough to move left Log.e(TAG, "snap left"); snapToScreen(mCurScreen - 1); } else if (velocityX < -SNAP_VELOCITY && mCurScreen < getChildCount() - 1) { // Fling enough to move right Log.e(TAG, "snap right"); snapToScreen(mCurScreen + 1); } else { snapToDestination(); } if (mVelocityTracker != null) { mVelocityTracker.recycle(); mVelocityTracker = null; } // } mTouchState = TOUCH_STATE_REST; break; case MotionEvent.ACTION_CANCEL: mTouchState = TOUCH_STATE_REST; break; }
return true; } @Override public boolean onInterceptTouchEvent(MotionEvent ev) { // TODO Auto-generated method stub Log.e(TAG, "onInterceptTouchEvent-slop:"+mTouchSlop); Log.v("11","ddd"); final int action = ev.getAction(); if ((action == MotionEvent.ACTION_MOVE) && (mTouchState != TOUCH_STATE_REST)) { return true; }
final float x = ev.getX(); final float y = ev.getY();
switch (action) { case MotionEvent.ACTION_MOVE: final int xDiff = (int)Math.abs(mLastMotionX-x); if (xDiff>mTouchSlop) { mTouchState = TOUCH_STATE_SCROLLING;
case MotionEvent.ACTION_CANCEL: case MotionEvent.ACTION_UP: mTouchState = TOUCH_STATE_REST; break; }
return mTouchState != TOUCH_STATE_REST; }
}这是我翻页效果的代码,我弄了好几天,今天终于遇到了高手
for (int i=0; i<PageCount; i++) { appPage = new GridView(this); // get the "i" page data app=new AppAdapter(this,apps,i); appPage.setAdapter(app); appPage.setNumColumns(4); appPage.setOnItemClickListener(listener); mScrollLayout.addView(appPage);
import java.util.List;import android.content.Context;
import android.content.pm.PackageManager;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.BaseAdapter;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.Toast;
//import android.widget.ImageView;
import android.widget.TextView;public class AppAdapter extends BaseAdapter {
private List<Image> mList;
private Context mContext;
public static final int APP_PAGE_SIZE = 6;
AppItem appItem;
public AppAdapter(Context context, List<Image> list, int page) {
mContext = context;
mList = new ArrayList<Image>();
int i = page * APP_PAGE_SIZE;
int iEnd = i+APP_PAGE_SIZE;
while ((i<list.size())&&(i<iEnd)){
mList.add(list.get(i));
i++;
}
}
public int getCount() {
// TODO Auto-generated method stub
return mList.size();
} public Object getItem(int position) {
// TODO Auto-generated method stub
return mList.get(position);
} public long getItemId(int position){
// TODO Auto-generated method stub
return position;
}
@Override public void notifyDataSetChanged() {
super.notifyDataSetChanged();
}
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
Image imgg = mList.get(position);
// parent.invalidate();
//AppItem appItem;
if (convertView == null) {
View v = LayoutInflater.from(mContext).inflate(R.layout.app_item, null);
appItem = new AppItem();
appItem.mAppIcon = (ImageView)v.findViewById(R.id.ivAppIcon);
appItem.mAppName = (TextView)v.findViewById(R.id.tvAppName);
appItem.name=imgg.getName();
Log.v("ddd1", "dddddddddddddddddddddddddd");
v.setTag(appItem);
convertView = v;
} else {
appItem = (AppItem)convertView.getTag();
Log.v("ddd2", "dddddddddddddddddddddddddd");
}
// set the icon
if(imgg.getState().equals("0"))
{
appItem.mAppIcon.setImageResource(imgg.getImgO());
}else
{
appItem.mAppIcon.setImageResource(imgg.getImgN());
}
appItem.state=imgg.getState();
appItem.Id=imgg.getCommandId();
// set the app name
appItem.mAppName.setText(imgg.getId()+"");
//parent.invalidate();
//appItem.mAppIcon.setOnClickListener(new listener());
return convertView;
} /**
* * @author Yao.GUET
*
*/
class AppItem {
//ImageButton mAppIcon;
ImageView mAppIcon;
String name;
String state;
int Id;
TextView mAppName;
}
}
这个就是继承了baseadapter的类,我觉得主要原因在这个类里
mContext = context;
mList = new ArrayList<Image>();
int i = page * APP_PAGE_SIZE;
int iEnd = i+APP_PAGE_SIZE;
while ((i<list.size())&&(i<iEnd)){
mList.add(list.get(i));
i++;
}
}
我觉得问题是在上面那个类的这个构造方法里
Adapter.notifyDataSetChanged();
你在外面肯定是这样来调用的吧 Adapter对象只是最后一个对象 你得用其它两个对象也调用notifyDataSetChanged();
public void initViews() {
// get all apps
final List<Image> apps = list;
// the total pages
final int PageCount = (int)Math.ceil(apps.size()/APP_PAGE_SIZE);
Log.e(TAG, "size:"+apps.size()+" page:"+PageCount);
for (int i=0; i<PageCount; i++) {
appPage = new GridView(this);
// get the "i" page data
app=new AppAdapter(this,apps,i);
appPage.setAdapter(app);
appPage.setNumColumns(4);
appPage.setOnItemClickListener(listener);
mScrollLayout.addView(appPage);
}
}
这是我产生对象的方法
package ycq.demo;import android.content.Context;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.VelocityTracker;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.widget.Scroller;/**
* WorkSapce @author Yao.GUET
* blog: http://blog.csdn.net/Yao_GUET
* date: 2011-05-04
*/
public class ScrollLayout extends ViewGroup { private static final String TAG = "ScrollLayout";
private Scroller mScroller;
private VelocityTracker mVelocityTracker;
private int mCurScreen;
private int mDefaultScreen = 0;
private static final int TOUCH_STATE_REST = 0;
private static final int TOUCH_STATE_SCROLLING = 1;
private static final int SNAP_VELOCITY = 600;
private int mTouchState = TOUCH_STATE_REST;
private int mTouchSlop;
private float mLastMotionX;
private float mLastMotionY; public ScrollLayout(Context context, AttributeSet attrs) {
this(context, attrs, 0);
Log.v("1","ddd");
// TODO Auto-generated constructor stub
} public ScrollLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
Log.v("2","ddd");
// TODO Auto-generated constructor stub
mScroller = new Scroller(context);
mCurScreen = mDefaultScreen;
mTouchSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop();
} @Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
// TODO Auto-generated method stub
Log.e(TAG, "onLayout");
//if (changed) {
Log.v("3","ddd");
int childLeft = 0;
final int childCount = getChildCount();
for (int i=0; i<childCount; i++) {
final View childView = getChildAt(i);
if (childView.getVisibility() != View.GONE) {
final int childWidth = childView.getMeasuredWidth();
childView.layout(childLeft, 0,
childLeft+childWidth, childView.getMeasuredHeight());
childLeft += childWidth;
}
//}
}
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
Log.e(TAG, "onMeasure");
Log.v("4","ddd");
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
invalidate();
final int width = MeasureSpec.getSize(widthMeasureSpec);
final int widthMode = MeasureSpec.getMode(widthMeasureSpec);
if (widthMode != MeasureSpec.EXACTLY) {
throw new IllegalStateException("ScrollLayout only canmCurScreen run at EXACTLY mode!");
}
final int heightMode = MeasureSpec.getMode(heightMeasureSpec);
if (heightMode != MeasureSpec.EXACTLY) {
throw new IllegalStateException("ScrollLayout only can run at EXACTLY mode!");
}
// The children are given the same width and height as the scrollLayout
final int count = getChildCount();
for (int i = 0; i < count; i++) {
getChildAt(i).measure(widthMeasureSpec, heightMeasureSpec);
}
// Log.e(TAG, "moving to screen "+mCurScreen);
scrollTo(mCurScreen * width, 0);
}
/**
* According to the position of current layout
* scroll to the destination page.
*/
public void snapToDestination(){
Log.v("5","ddd");
final int screenWidth = getWidth();
final int destScreen = (getScrollX()+ screenWidth/2)/screenWidth;
snapToScreen(destScreen);
}
public void snapToScreen(int whichScreen) {
Log.v("6","ddd");
// get the valid layout page
whichScreen = Math.max(0, Math.min(whichScreen, getChildCount()-1));
if (getScrollX() != (whichScreen*getWidth())) {
final int delta = whichScreen*getWidth()-getScrollX();
mScroller.startScroll(getScrollX(), 0,delta, 0, Math.abs(delta)*2);
mCurScreen = whichScreen;
Log.v("aaa",mCurScreen+"");
invalidate(); // Redraw the layout
}
}
public void setToScreen(int whichScreen) {
Log.v("7",whichScreen+"");
whichScreen = Math.max(0, Math.min(whichScreen, getChildCount()-1));
mCurScreen = whichScreen;
scrollTo(whichScreen*getWidth(), 0);
}
public int getCurScreen() {
Log.v("8",mCurScreen+"");
return mCurScreen;
}
@Override
public void computeScroll(){
// TODO Auto-generated method stub
Log.v("9","ddd");
if (mScroller.computeScrollOffset()) {
scrollTo(mScroller.getCurrX(), mScroller.getCurrY());
postInvalidate();
}
} @Override
public boolean onTouchEvent(MotionEvent event) {
Log.v("10","ddd");
// TODO Auto-generated method stub
if (mVelocityTracker == null) {
mVelocityTracker = VelocityTracker.obtain();
}
mVelocityTracker.addMovement(event);
final int action = event.getAction();
final float x = event.getX();
final float y = event.getY();
switch (action) {
case MotionEvent.ACTION_DOWN:
Log.e(TAG, "event down!");
if (!mScroller.isFinished()){
mScroller.abortAnimation();
//invalidate();
}
mLastMotionX = x;
break;
case MotionEvent.ACTION_MOVE:
int deltaX = (int)(mLastMotionX - x);
mLastMotionX = x;
scrollBy(deltaX, 0);
break;
case MotionEvent.ACTION_UP:
Log.e(TAG, "event : up");
// if (mTouchState == TOUCH_STATE_SCROLLING) {
final VelocityTracker velocityTracker = mVelocityTracker;
velocityTracker.computeCurrentVelocity(1000);
int velocityX = (int) velocityTracker.getXVelocity(); Log.e(TAG, "velocityX:"+velocityX);
if (velocityX > SNAP_VELOCITY && mCurScreen > 0) {
// Fling enough to move left
Log.e(TAG, "snap left");
snapToScreen(mCurScreen - 1);
} else if (velocityX < -SNAP_VELOCITY
&& mCurScreen < getChildCount() - 1) {
// Fling enough to move right
Log.e(TAG, "snap right");
snapToScreen(mCurScreen + 1);
} else {
snapToDestination();
} if (mVelocityTracker != null) {
mVelocityTracker.recycle();
mVelocityTracker = null;
}
// }
mTouchState = TOUCH_STATE_REST;
break;
case MotionEvent.ACTION_CANCEL:
mTouchState = TOUCH_STATE_REST;
break;
}
return true;
} @Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
// TODO Auto-generated method stub
Log.e(TAG, "onInterceptTouchEvent-slop:"+mTouchSlop);
Log.v("11","ddd");
final int action = ev.getAction();
if ((action == MotionEvent.ACTION_MOVE) &&
(mTouchState != TOUCH_STATE_REST)) {
return true;
}
final float x = ev.getX();
final float y = ev.getY();
switch (action) {
case MotionEvent.ACTION_MOVE:
final int xDiff = (int)Math.abs(mLastMotionX-x);
if (xDiff>mTouchSlop) {
mTouchState = TOUCH_STATE_SCROLLING;
}
break;
case MotionEvent.ACTION_DOWN:
mLastMotionX = x;
mLastMotionY = y;
mTouchState = mScroller.isFinished()? TOUCH_STATE_REST : TOUCH_STATE_SCROLLING;
break;
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP:
mTouchState = TOUCH_STATE_REST;
break;
}
return mTouchState != TOUCH_STATE_REST;
}
}这是我翻页效果的代码,我弄了好几天,今天终于遇到了高手
appPage = new GridView(this);
// get the "i" page data
app=new AppAdapter(this,apps,i);
appPage.setAdapter(app);
appPage.setNumColumns(4);
appPage.setOnItemClickListener(listener);
mScrollLayout.addView(appPage);
}
这个是你写的代码 在for循环中去 执行 从新去new 会覆盖之前的值 楼主你好好看看这里 我感觉这里有问题, 我可不是高手喔
appPage = new GridView(this);
app=new AppAdapter(this,apps,i);可以每次循环就又从新new了这个对象
app=new AppAdapter(this,apps,i);这个地方我认为这样写也没什么错,因为不同页就不同对象,我是新手,思路不怎么清晰,xys289187120有什么好方法吗