Android 自定义控件 eBook 翻书效果

转载自：
http://wallage.blog.163.com/blog/static/1738962420108915833584/
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：
<?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="http://wallage.blog.163.com/blog/@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 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<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);
}
...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。