The method of realizing sliding effect of novel reader by Android programming _android

This paper illustrates the method of Android programming to realize the sliding effect of novel reader. Share to everyone for your reference, specific as follows:

Read the novel all know that the novel Reader page has a variety of effects, such as simulation page, sliding page, and so on. For some reason, suddenly want to write a simple point of sliding page effect. There is no intention to write here, I hope you can according to this effect extrapolate, write other results. The picture is not on.

Here's the code: you understand the Ontouch event.

Package Com.example.testscroll.view; 
Import Android.content.Context; 
Import Android.util.AttributeSet; 
Import android.view.MotionEvent; 
Import Android.view.VelocityTracker; 
Import Android.view.View; 
Import android.view.ViewConfiguration; 
Import Android.view.ViewGroup; 
Import Android.widget.Scroller; 
 public class Flipperlayout extends ViewGroup {private scroller mscroller; 
 Private Velocitytracker Mvelocitytracker; 
 private int mvelocityvalue = 0; 
 /** agreed that this slide is valid distance */private int limitdistance = 0; 
 private int screenwidth = 0; 
 /** finger moving Direction/private static final int move_to_left = 0; 
 private static final int move_to_right = 1; 
 private static final int move_no_result = 2; 
 /** Final Touch Result direction * * Private int mtouchresult = Move_no_result; 
 /** first direction/private int mdirection = Move_no_result; 
 /** Touch Mode * * private static final int mode_none = 0; 
 private static final int mode_move = 1; 
 private int mmode = Mode_none; /** Sliding View */private View MscroLlerview = null; 
 /** view (on the edge, invisible) * * Private view Currenttopview = null; 
 /** display view, displayed on the screen/private View currentshowview = null; 
 /** the bottom view (invisible)/private view Currentbottomview = null; 
  Public Flipperlayout {Super (context); 
 Init (context); 
  Public Flipperlayout (context, AttributeSet attrs, int defstyle) {Super (context, attrs, Defstyle); 
 Init (context); 
  Public Flipperlayout (context, AttributeSet attrs) {Super (context, attrs); 
 Init (context); 
  private void init (context context) {Mscroller = new scroller (context); 
  ScreenWidth = Context.getresources (). Getdisplaymetrics (). Widthpixels; 
 Limitdistance = SCREENWIDTH/3;  /*** * * @param listener * @param currentbottomview * Lowest view, initial status not visible * @param currentshowview * The view that is being displayed @param currenttopview * Top view, slide out of the screen/public void initflipperviews (Touchlistener listener, View Currentbottomview, viewCurrentshowview, View currenttopview) {this.currentbottomview = Currentbottomview; 
  This.currentshowview = Currentshowview; 
  This.currenttopview = Currenttopview; 
  Settouchresultlistener (listener); 
  AddView (Currentbottomview); 
  AddView (Currentshowview); 
  AddView (Currenttopview); 
 /** defaults to the topmost view sliding edge (used to view the previous page)/Currenttopview.scrollto (-screenwidth, 0); @Override protected void OnLayout (Boolean changed, int l, int t, int r, int b) {for (int i = 0; i < GETCHILDC Ount (); 
   i++) {View child = Getchildat (i); 
   int height = child.getmeasuredheight (); 
   int width = child.getmeasuredwidth (); 
  Child.layout (0, 0, width, height); } @Override protected void onmeasure (int widthmeasurespec, int heightmeasurespec) {super.onmeasure (Widthmeasur 
  Espec, Heightmeasurespec); 
  int width = measurespec.getsize (widthmeasurespec); 
  int height = measurespec.getsize (heightmeasurespec); 
  Setmeasureddimension (width, height); for (int i = 0; i < Getchildcount (); 
  i++) {Getchildat (i). Measure (Widthmeasurespec, heightmeasurespec); 
 } private int startx = 0; @Override public boolean dispatchtouchevent (motionevent ev) {switch (ev.getaction ()) {case Motionevent.action_do 
   Wn:if (!mscroller.isfinished ()) {break; 
   } startx = (int) ev.getx (); 
  Break 
 return super.dispatchtouchevent (EV); @SuppressWarnings ("deprecation") @Override public boolean ontouchevent (Motionevent event) {Obtainvelocitytrack 
  ER (event); Switch (event.getaction ()) {Case MotionEvent.ACTION_MOVE:if (!mscroller.isfinished ()) {return Super.ontouch 
   Event (event); 
   } if (startx = = 0) {startx = (int) event.getx (); 
   final int distance = startx-(int) event.getx ();  if (mdirection = = Move_no_result) {if (Mlistener.whetherhasnextpage () && distance > 0) {mdirection 
    = Move_to_left; else if (mlistener.whetherhaspreviouspage () && DistancE < 0) {mdirection = Move_to_right; } if (Mmode = Mode_none && (mdirection = = Move_to_left && mlistener.whetherhasnextpage () ) || (mdirection = = Move_to_right && mlistener whetherhaspreviouspage ()))) 
   {mmode = Mode_move; } if (Mmode = = Mode_move) {if (mdirection = = Move_to_left && distance <= 0) | | (mdirection = = move_to_right && distance >= 0)) 
    {mmode = Mode_none; } if (Mdirection!= move_no_result) {if (mdirection = = Move_to_left) {if (Mscrollerview!= currents 
     Howview) {Mscrollerview = Currentshowview; 
     } else {if (Mscrollerview!= currenttopview) {mscrollerview = Currenttopview; } if (Mmode = = Mode_move) {mvelocitytracker.computecurrentvelocity (1000, VIEWCONFIGURATION.GETMAXIMUMFL 
     Ingvelocity ()); 
     if (mdirection = = Move_to_left) {mscrollerview.scrollto (distance, 0); } else {Mscrollerview.scrollto (screenwidth + distance, 0); 
     } else {final int scrollx = MSCROLLERVIEW.GETSCROLLX (); if (mdirection = = Move_to_left && scrollx!= 0 && mlistener.whetherhasnextpage ()) {MSCROLLERVIEW.S 
     Crollto (0, 0); else if (mdirection = Move_to_right && mlistener.whetherhaspreviouspage () && screenwidth!= Math.Abs (s 
     CROLLX)) {Mscrollerview.scrollto (-screenwidth, 0); 
  }} break; 
   Case MotionEvent.ACTION_UP:if (Mscrollerview = = null) {return super.ontouchevent (event); 
   Final int scrollx = MSCROLLERVIEW.GETSCROLLX (); 
   Mvelocityvalue = (int) mvelocitytracker.getxvelocity (); 
    Scroll Zo Zheng, right negative (), (startx + dx) value if 0, reset/* android.widget.Scroller.startScroll (int startx, int starty, int 
   * DX, int dy, int duration) */int time = 500; if (Mmode = = Mode_move && mdirection = = move_to_left) {if (Scrollx >limitdistance | | 
     Mvelocityvalue <-time) {//fingers moved to the left, you can turn the screen mtouchresult = Move_to_left; 
     if (Mvelocityvalue <-time) {time = 200; 
    } mscroller.startscroll (SCROLLX, 0, SCREENWIDTH-SCROLLX, 0, time); 
     else {mtouchresult = Move_no_result; 
    Mscroller.startscroll (scrollx, 0,-SCROLLX, 0, time); } else if (Mmode = mode_move && mdirection = = move_to_right) {if (SCREENWIDTH-SCROLLX) > LIMITD istance | | 
     Mvelocityvalue > Time) {//fingers to the right to move, you can turn the screen mtouchresult = Move_to_right; 
     if (Mvelocityvalue > Time) {time = 250; 
    } mscroller.startscroll (SCROLLX, 0,-SCROLLX, 0, time); 
     else {mtouchresult = Move_no_result; 
    Mscroller.startscroll (scrollx, 0, SCREENWIDTH-SCROLLX, 0, time); 
   } resetvariables (); 
   Postinvalidate (); 
  Break 
 return true; 
  private void Resetvariables () {mdirection = Move_no_result; Mmode = MODE_none; 
  startx = 0; 
 Releasevelocitytracker (); 
 Private Touchlistener Mlistener; 
 private void Settouchresultlistener (Touchlistener listener) {This.mlistener = listener; 
  @Override public void Computescroll () {super.computescroll ();
   if (Mscroller.computescrolloffset ()) {Mscrollerview.scrollto (Mscroller.getcurrx (), Mscroller.getcurry ()); 
  Postinvalidate (); else if (mscroller.isfinished () && mlistener!= null && mtouchresult!= move_no_result) {if (Mtouch 
    result = = Move_to_left) {if (Currenttopview!= null) {Removeview (Currenttopview); 
    } Currenttopview = Mscrollerview; 
    Currentshowview = Currentbottomview; 
     if (Mlistener.currentislastpage ()) {final View Newview = Mlistener.createview (Mtouchresult); 
     Currentbottomview = Newview; 
    AddView (Newview, 0); 
     else {Currentbottomview = new View (GetContext ()); 
     Currentbottomview.setvisibility (View.gone); AddView (CurrenTbottomview, 0); 
    } else {if (Currentbottomview!= null) {Removeview (Currentbottomview); 
    } Currentbottomview = Currentshowview; 
    Currentshowview = Mscrollerview; 
     if (Mlistener.currentisfirstpage ()) {final View Newview = Mlistener.createview (Mtouchresult); 
     Currenttopview = Newview; 
     Currenttopview.scrollto (-screenwidth, 0); 
    AddView (Currenttopview); 
     else {Currenttopview = new View (GetContext ()); 
     Currenttopview.scrollto (-screenwidth, 0); 
     Currenttopview.setvisibility (View.gone); 
    AddView (Currenttopview); 
  } Mtouchresult = Move_no_result; }} private void Obtainvelocitytracker (Motionevent event) {if (Mvelocitytracker = null) {Mvelocitytracker = 
  Velocitytracker.obtain (); 
 } mvelocitytracker.addmovement (event); 
   private void Releasevelocitytracker () {if (Mvelocitytracker!= null) {mvelocitytracker.recycle (); 
  Mvelocitytracker = null; 
 } 
 }/*** * For real-time callback Touch event callback * * @author Freeson/public interface Touchlistener {/** Fingers slide to the left, view next chapter/FINA 
  l int move_to_left = 0; 
  /** finger slide to the right, that is, view the previous chapter */FINAL int move_to_right = 1; 
  /** * Create a view * * @param direction * {@link move_to_left,move_to_right} * * @return * * 
  Public View CreateView (final int direction); 
  /*** * Whether the current page is the first page * * @return * * public boolean currentisfirstpage (); 
  /*** * Whether the current page is the last page * * @return * * public boolean currentislastpage (); 
  /** * Whether the current page has a previous page (used to determine the sliding) * * @return/public boolean whetherhaspreviouspage (); 
 /*** * Whether the current page has a next page (used to determine the sliding) * * @return/public boolean whetherhasnextpage ();

 } 
}

Activity test File:

Package com.example.testscroll; 
Import Java.io.ByteArrayOutputStream; 
Import java.io.IOException; 
Import Java.io.InputStream; 
Import android.app.Activity; 
Import Android.content.res.AssetManager; 
Import Android.os.Bundle; 
Import Android.os.Handler; 
Import Android.view.LayoutInflater; 
Import Android.view.View; 
Import Android.view.View.OnClickListener; 
Import Android.widget.TextView; 
Import Com.example.testscroll.view.FlipperLayout; 
Import Com.example.testscroll.view.FlipperLayout.TouchListener; 
Import COM.EXAMPLE.TESTSCROLLACTIVITY.R; 
 public class Mainactivity extends activity implements Onclicklistener, Touchlistener {private String text = ""; 
 private int textlenght = 0; 
 private static final int COUNT = 400; 
 private int currenttopendindex = 0; 
 private int currentshowendindex = 0; 
 private int currentbottomendindex = 0; Private Handler Handler = new Handler () {public void Handlemessage (Android.os.Message msg) {flipperlayout Rootlay out = (flipperlayOut) Findviewbyid (R.id.container); 
   View Recoverview = Layoutinflater.from (mainactivity.this). Inflate (r.layout.view_new, NULL); 
   View view1 = Layoutinflater.from (mainactivity.this). Inflate (r.layout.view_new, NULL); 
   View view2 = Layoutinflater.from (mainactivity.this). Inflate (r.layout.view_new, NULL); 
   Rootlayout.initflipperviews (Mainactivity.this, View2, View1, Recoverview); 
   Textlenght = Text.length (); 
   SYSTEM.OUT.PRINTLN ("----textlenght----->" + textlenght); 
   TextView TextView = (TextView) View1.findviewbyid (R.id.textview); 
    if (Textlenght > Count) {textview.settext (text.subsequence (0, Count)); 
    TextView = (TextView) View2.findviewbyid (R.id.textview); 
     if (Textlenght > (Count << 1)) {Textview.settext (Text.subsequence (count, Count * 2)); 
     Currentshowendindex = COUNT; 
    Currentbottomendindex = COUNT << 1; 
     else {textview.settext (text.subsequence (COUNT, textlenght)); Currentshowendindex = TEXTLEnght; 
    Currentbottomendindex = Textlenght; 
    } else {Textview.settext (text.subsequence (0, textlenght)); 
    Currentshowendindex = Textlenght; 
   Currentbottomendindex = Textlenght; 
 } 
  }; 
 }; 
  @Override protected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); 
  Setcontentview (R.layout.activity_main); 
 New Readingthread (). Start (); @Override public void OnClick (View v) {} @Override public View createview (final int direction) {String tx 
  t = ""; 
   if (direction = = Touchlistener.move_to_left) {currenttopendindex = Currentshowendindex; 
   Final int nextindex = Currentbottomendindex + COUNT; 
   Currentshowendindex = Currentbottomendindex; 
    if (Textlenght > Nextindex) {txt = text.substring (Currentbottomendindex, Nextindex); 
   Currentbottomendindex = Nextindex; 
    else {txt = text.substring (Currentbottomendindex, textlenght); 
   Currentbottomendindex = Textlenght; 
  }else {currentbottomendindex = Currentshowendindex; 
   Currentshowendindex = Currenttopendindex; 
   Currenttopendindex = Currenttopendindex-count; 
  txt = text.substring (Currenttopendindex-count, Currenttopendindex); 
  View view = Layoutinflater.from (this). Inflate (r.layout.view_new, NULL); 
  TextView TextView = (TextView) View.findviewbyid (R.id.textview); 
  Textview.settext (TXT); System.out.println ("-top->" + Currenttopendindex + "-show->" + Currentshowendindex + "--bottom-->" + 
  Currentbottomendindex); 
 return view; 
 @Override public boolean whetherhaspreviouspage () {return currentshowendindex > COUNT; 
 @Override public boolean whetherhasnextpage () {return Currentshowendindex < textlenght; 
  @Override public boolean Currentisfirstpage () {Boolean should = Currenttopendindex > COUNT; 
   if (!should) {currentbottomendindex = Currentshowendindex; 
   Currentshowendindex = Currenttopendindex; CurrenttopendIndex = Currenttopendindex-count; 
 return should; 
  @Override public boolean Currentislastpage () {Boolean should = Currentbottomendindex < Textlenght; 
   if (!should) {currenttopendindex = Currentshowendindex; 
   Final int nextindex = Currentbottomendindex + COUNT; 
   Currentshowendindex = Currentbottomendindex; 
   if (Textlenght > Nextindex) {currentbottomendindex = Nextindex; 
   else {currentbottomendindex = Textlenght; 
 } return should; 
   Private class Readingthread extends Thread {public void run () {Assetmanager am = getassets (); 
   InputStream response; 
    try {response = Am.open ("Text.txt"); 
     if (response!= null) {Bytearrayoutputstream BAOs = new Bytearrayoutputstream (); 
     int i =-1; 
     while ((i = Response.read ())!=-1) {baos.write (i); 
     } Text = new String (Baos.tobytearray (), "UTF-8"); 
     Baos.close (); 
     Response.close (); Handler.sendemptymessage (0); 
   } catch (IOException e) {e.printstacktrace ();

 } 
  } 
 } 
}

XML layout file:

<?xml version= "1.0" encoding= "Utf-8"?> <linearlayout xmlns:android= 
"http://schemas.android.com/apk/" Res/android " 
 android:layout_width=" match_parent " 
 android:layout_height=" match_parent " 
 android:o" rientation= "Horizontal" > 
 <textview 
  android:id= "@+id/textview" 
  android:layout_width= "0DP" 
  android:layout_height= "match_parent" 
  android:layout_weight= "1.0" 
  android:background= "#666666" 
  android:gravity= "center" 
  android:text= "New View" 
  android:textcolor= "@android: Color/white" 
  Android:textsize= "16SP" 
  android:visibility= "visible"/> 
 <view 
  android:layout_width= "5DP" 
  android:layout_height= "match_parent" 
  android:background= "#FFFF00" 
  android:gravity= "center" 
  android:textsize= "25SP" 
  android:visibility= "visible"/>
</LinearLayout>

Activity layout File:

<com.example.testscroll.view.flipperlayout xmlns:android= "Http://schemas.android.com/apk/res/android" 
 xmlns:tools= "Http://schemas.android.com/tools" " 
 android:id=" @+id/container " 
 android:layout_width=" match _parent " 
 android:layout_height=" match_parent "> 
</com.example.testscroll.view.FlipperLayout>

Note: The above why add a rate calculator, in fact, just to identify the action is not a quick move, even if the sliding distance of less than 1/3 of the screen, but as long as the rate of satisfaction can be determined to change the sliding is a page-flipping action.

Note: This is only one of the effects of sliding, ah, not including the logic of the chapters of the novel Oh. Although some rough, but there is still a place to learn, if you have any good solutions, you can discuss together.

Add demo download Address click Download Demo.

I hope this article will help you with the Android program.