Android开发 翻书效果实例

  Android开发当中,尤其是在做电子书等方面的项目时,难免会遇到翻书效果的使用。下面就来讲解下,实现翻书效果的实例。

  eBook继承FrameLayout,好处在于FrameLayout有图层效果,后添加的View类能覆盖前面的View。

  初始化:定义一个LinearLayout的成员变量mView,将page.xml inflate 成View分别用leftPage,rightPage引用,并初始化其数据,将leftPage,rightPage通过addView添加到 mView,然后将mView添加到eBook。在eBook里定义一个私有类BookView extends View。 并定义成员变量 BookView mBookView; 最后将mBookView添加的eBook中,这样,mView中的内容为书面内容,mBookView中的内容为特效内容。后续手势动作:可将各种手势的特效动作画于mBookView的画布中。

  Java代码:

  package eoe.book;

  import Android.app.Activity;

  import android.os.Bundle;

  import android.util.Log;

  import android.view.View;

  import android.widget.ImageView;

  public class Book extends Activity {

  /** Called when the activity is first created. */

  eBook mBook;

  public void onCreate(Bundle savedInstanceState) {

  super.onCreate(savedInstanceState);

  setContentView(R.layout.main);

  mBook = (eBook)findViewById(R.id.my_book);

  mBook.addLayoutRecForPage(R.layout.page,21);

  mBook.setListener(new eBook.Listener() {

  public void onPrevPage() {

  updateContent();

  }

  public void onNextPage() {

  updateContent();

  }

  public void onInit() {

  updateContent();

  }

  });

  }

  private void updateContent(){

  int index = mBook.getIndexForLeftPage();

  View left = mBook.getLeftPage(),right = mBook.getRightPage();

  View next1 = mBook.getNextPage1(),next2 = mBook.getNextPage2();

  View prev1 = mBook.getPrevPage1(),prev2 = mBook.getPrevPage2();

  if(left != null)setImg(left,index);

  if(right != null)setImg(right,index+1);

  if(next1 != null)setImg(next1,index+2);

  if(next2 != null)setImg(next2,index+3);

  if(prev1 != null)setImg(prev1,index-1);

  if(prev2 != null)setImg(prev2,index-2);

  mBook.invalidate();

  }

  private void setImg(View v , int index){

  if(index >= 0 && index < 20){

  ImageView img = (ImageView)v.findViewById(R.id.book_img);

  if(img == null)return;

  Log.d("eBook","set Img");

  switch(index%6){

  case 0:

  img.setImageResource(R.drawable.p1);

  break;

  case 1:

  img.setImageResource(R.drawable.p2);

  break;

  case 2:

  img.setImageResource(R.drawable.p3);

  break;

  case 3:

  img.setImageResource(R.drawable.p4);

  break;

  case 4:

  img.setImageResource(R.drawable.p5);

  break;

  case 5:

  img.setImageResource(R.drawable.p6);

  break;

  default:

  break;

  }

  }

  }

  }

  我们在来看看xml代码:

  java代码:

  main.xml文件:

  <?xml version="1.0" encoding="utf-8"?>

  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

  android:orientation="vertical"

  android:layout_width="fill_parent"

  android:layout_height="fill_parent">

  <com.book.eBook android:id="@+id/my_book"

  android:layout_width="fill_parent"

  android:layout_height="fill_parent"/>

  </LinearLayout>

  page.xml文件:

  <?xml version="1.0" encoding="utf-8"?>

  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

  android:orientation="vertical"

  android:layout_width="fill_parent"

  android:layout_height="fill_parent"

  android:padding="20dip"

  android:background="#FFFFDD">

  <ImageView android:layout_width="fill_parent" android:id="@+id/book_img"

  android:layout_height="fill_parent" android:layout_weight="1"

  android:scaleType="fitXY" android:src="@drawable/p1"/>

  <com.book.TelEdit

  android:id="@+id/book_text"

  android:layout_width="fill_parent"

  android:background="#ffffdd"

  android:gravity="top"

  android:typeface="sans"

  android:capitalize="sentences"

  android:lineSpacingExtra="5dip"

  android:textSize="15dip"

  android:textColor="#000000"

  android:layout_height="fill_parent"

  android:paddingTop="30dip"

  android:layout_weight="1"/>

  </LinearLayout>

 

  控件TelEdit.java代码:

  java代码:

  package eoe.book;

  import android.content.Context;

  import android.graphics.Canvas;

  import android.graphics.Color;

  import android.graphics.Paint;

  import android.util.AttributeSet;

  import android.view.WindowManager;

  import android.widget.EditText;

  public class TelEdit extends EditText {

  Context mContext;

  public TelEdit(Context context) {

  super(context);

  mContext = context;

  }

  public TelEdit(Context context, AttributeSet attrs) {

  super(context, attrs);

  mContext = context;

  }

  public TelEdit(Context context, AttributeSet attrs, int defStyle) {

  super(context, attrs, defStyle);

  mContext = context;

  }

  protected void onDraw(Canvas canvas) {

  WindowManager wm = (WindowManager) mContext.getSystemService("window");

  int windowWidth = wm.getDefaultDisplay().getWidth();

  int windowHeight = wm.getDefaultDisplay().getHeight();

  Paint paint = new Paint();

  paint.setStyle(Paint.Style.FILL);

  paint.setColor(Color.BLACK);

  int paddingTop = getPaddingTop();

  int paddingBottom = getPaddingBottom();

  int scrollY = getScrollY();

  int scrollX = getScrollX() + windowWidth;

  int innerHeight = scrollY + getHeight() - paddingBottom;

  int lineHeight = getLineHeight();

  int baseLine = scrollY+ (lineHeight - ((scrollY - paddingTop) % lineHeight));

  int x = 8;

  while (baseLine < innerHeight) {

  canvas.drawLine(x, baseLine, scrollX - x, baseLine, paint);

  baseLine += lineHeight;

  }

  super.onDraw(canvas);

  }

  }

  

  eBook.java文件部分代码:

  java代码:

  package eoe.book;

  import java.util.ArrayList;

  import java.util.Date;

  import java.util.List;

  import android.content.Context;

  import android.graphics.Bitmap;

  import android.graphics.Canvas;

  import android.graphics.Color;

  import android.graphics.LinearGradient;

  import android.graphics.Paint;

  import android.graphics.Path;

  import android.graphics.Point;

  import android.graphics.PorterDuffXfermode;

  import android.graphics.Shader;

  import android.graphics.PorterDuff.Mode;

  import android.util.AttributeSet;

  import android.util.Log;

  import android.view.GestureDetector;

  import android.view.LayoutInflater;

  import android.view.MotionEvent;

  import android.view.View;

  import android.view.GestureDetector.OnGestureListener;

  import android.widget.FrameLayout;

  import android.widget.LinearLayout;

  public class eBook extends FrameLayout{

  public static final String LOG_TAG = "eBook";

  List<Integer> myRecPages;

  int totalPageNum;

  Context mContext;

  boolean hasInit = false;

  final int defaultWidth = 600 , defaultHeight = 400;

  int contentWidth = 0;

  int contentHeight = 0;

  View leftPage,rightPage,llPage,lrPage,rrPage,rlPage;

  LinearLayout mView;

  bookView mBookView;

  boolean closeBook = false;

  private enum Corner {

  LeftTop,RightTop,LeftBottom,RightBottom,None

  };

  private Corner mSelectCorner;

  final int clickCornerLen = 250*250; //50dip

  float scrollX = 0,scrollY = 0;

  int indexPage = 0;

  private enum State {

  ABOUT_TO_ANIMATE,ANIMATING,ANIMATE_END,READY,TRACKING

  };

  private State mState;

  private Point aniStartPos;

  private Point aniStopPos;

  private Date aniStartTime;

  private long aniTime = 2000;

  private long timeOffset = 900;

  Listener mListener;

  private GestureDetector mGestureDetector;

  private BookOnGestureListener mGestureListener;

  public eBook(Context context) {

  super(context);

  Init(context);

  }

  public eBook(Context context, AttributeSet attrs) {

  super(context, attrs);

  Init(context);

  }

  }




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