屏幕翻页控件，翻页控件,/* * To chan

屏幕翻页控件，翻页控件,/* * To chan

/* * To change this template, choose Tools | Templates * and open the template in the editor. */package 你的包名;import android.app.Activity;import android.content.Context;import android.util.AttributeSet;import android.util.DisplayMetrics;import android.view.MotionEvent;import android.view.View;import android.view.ViewGroup;import android.widget.HorizontalScrollView;import android.widget.LinearLayout;/** * * @author Administrator */public class PageSelector extends HorizontalScrollView{    private LinearLayout m_scrollContent;    private boolean m_scrollEvent = false;    private int m_scrollPos = 0;    private boolean m_smoothScroll = false;    private boolean m_touchScroll = false;    public PageSelector(Context context) {        super(context);        // TODO Auto-generated constructor stub        m_scrollEvent = false;        m_scrollContent = new LinearLayout(context);        m_scrollContent.setOrientation(LinearLayout.HORIZONTAL);        ViewGroup.LayoutParams lp = new ViewGroup.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);        addView(m_scrollContent, lp);        this.setFadingEdgeLength(0);        m_scrollFinishedListener = null;    }    public PageSelector(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        // TODO Auto-generated constructor stub        m_scrollEvent = false;        m_scrollContent = new LinearLayout(context);        m_scrollContent.setOrientation(LinearLayout.HORIZONTAL);        ViewGroup.LayoutParams lp = new ViewGroup.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);        addView(m_scrollContent, lp);        this.setFadingEdgeLength(0);        m_scrollFinishedListener = null;    }    public PageSelector(Context context, AttributeSet attrs) {        super(context, attrs);        // TODO Auto-generated constructor stub        m_scrollEvent = false;        m_scrollContent = new LinearLayout(context);        m_scrollContent.setOrientation(LinearLayout.HORIZONTAL);        ViewGroup.LayoutParams lp = new ViewGroup.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);        addView(m_scrollContent, lp);        this.setFadingEdgeLength(0);        m_scrollFinishedListener = null;    }    public void touchScrollAble( boolean able ){        this.m_touchScroll = able;    }    public int addPage(int ResID)    {        Activity screen = (Activity)this.getContext();        View pageView = (LinearLayout)screen.getLayoutInflater().inflate(ResID, null);        if ( null == pageView ) return -1;        return addPage(pageView);    }    public View delPage( int index ){        View v = getPage( index );        if ( null == v ) return null;        m_scrollContent.removeViewAt(index);        return v;    }    public View getPage(int index){        if ( 0 > index || index >= m_scrollContent.getChildCount() ) return null;        return m_scrollContent.getChildAt(index);    }    public boolean toNextPage() {        m_scrollPos = getScrollX() + getWidth();        if (m_scrollPos > computeHorizontalScrollRange() - getWidth()) return true;        m_scrollEvent = true;        m_smoothScroll = false;        this.scrollTo(m_scrollPos, 0);        return true;    }    public boolean smoothToNextPage() {        m_scrollPos = getScrollX() + getWidth();        if (m_scrollPos > computeHorizontalScrollRange() - getWidth()) return true;        m_scrollEvent = true;        m_smoothScroll = true;        this.smoothScrollTo(m_scrollPos, 0);        return true;    }    public boolean toPreviousPage() {        if (getScrollX() <= 0) return true;        m_scrollPos = getScrollX() - getWidth();        m_scrollEvent = true;        m_smoothScroll = false;        this.scrollTo(m_scrollPos, 0);        return true;    }    public boolean smoothToPreviousPage() {        if (getScrollX() <= 0) return true;        m_scrollPos = getScrollX() - getWidth();        m_scrollEvent = true;        m_smoothScroll = true;        this.smoothScrollTo(m_scrollPos, 0);        return true;    }    public int getCurPage(){        if (getScrollX() <= 0) return 0;        else return getScrollX() / getWidth();    }    private int addPage(View pageView)    {        if ( null == pageView ) return -1;        ViewGroup.LayoutParams lp = getPageLayoutParams();        m_scrollContent.addView(pageView, m_scrollContent.getChildCount(), lp);        return m_scrollContent.getChildCount() - 1;    }    private ViewGroup.LayoutParams getPageLayoutParams(){        Activity screen = (Activity)this.getContext();        ViewGroup.LayoutParams lp = this.getLayoutParams();        int m_pageWidth;        int m_pageHeigth;        if (lp.width == LayoutParams.FILL_PARENT || lp.width == LayoutParams.WRAP_CONTENT || lp.width == LayoutParams.MATCH_PARENT) {            DisplayMetrics metrics = new DisplayMetrics();            screen.getWindowManager().getDefaultDisplay().getMetrics(metrics);            m_pageWidth = metrics.widthPixels;        } else {            m_pageWidth = lp.width;        }        if (lp.height == LayoutParams.FILL_PARENT || lp.height == LayoutParams.WRAP_CONTENT || lp.height == LayoutParams.MATCH_PARENT) {            DisplayMetrics metrics = new DisplayMetrics();            screen.getWindowManager().getDefaultDisplay().getMetrics(metrics);            m_pageHeigth = metrics.heightPixels;        } else {            m_pageHeigth = lp.height;        }        return new ViewGroup.LayoutParams(m_pageWidth, m_pageHeigth);    }    @Override    public boolean onTouchEvent(MotionEvent ev) {        // TODO Auto-generated method stub        return m_touchScroll;    }    @Override    public void onScrollChanged(int l, int t, int oldl, int oldt){//        super.onScrollChanged(l, t, oldl, oldt);        if ( !m_scrollEvent ) {            m_scrollEvent = true;            m_scrollPos = oldl;            this.scrollTo(m_scrollPos, 0);            return;        }        else if ( l == m_scrollPos ) {            m_scrollEvent = false;            if ( null != m_scrollFinishedListener ){                m_scrollFinishedListener.OnScrollFinished();            }        }    }    public static abstract class OnScrollFinishedListener {        public abstract void OnScrollFinished();    }    OnScrollFinishedListener m_scrollFinishedListener;    public void setOnScrollFinishedListener( OnScrollFinishedListener scrollFinishedListener ){        m_scrollFinishedListener = scrollFinishedListener;    }}//该片段来自于http://byrx.net