本文实例讲述了Android自定义控件eBook实现翻书效果的方法。分享给大家供大家参考，具体如下：

效果图：

Book.java文件：

package com.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;

}

}

}

}

main.xml文件：

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent">

android:layout_width="fill_parent"

android:layout_height="fill_parent"/>

page.xml文件：

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:padding="20dip"

android:background="#FFFFDD">

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

android:scaleType="fitXY" android:src="http://wallage.blog.163.com/blog/@drawable/p1"/>

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"/>

控件TelEdit.java代码：

package com.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 com.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 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);

}

...省略

}

该控件大致实现方法：

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。

希望本文所述对大家Android程序设计有所帮助。