我们在Android系统中进行电子书阅读时,经常见到有翻书效果。那么在进行电子书等方面的Android开发时,一般也会使用翻书效果。本文就给出一个实例来讲解Android翻书效果的实现方法。
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。
- 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;
- }
- }
- }
- }
我们再来看看main.xml代码:
- <?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:
- 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:
- 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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