Android 自訂控制項 eBook 翻書效果

Author:Wallace Wang   Email:wallage@qq.com

聲明：本文乃本人原創作品，僅供學習使用。

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http://wallage.blog.163.com/blog/static/1738962420108915833584/

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   Book.java檔案： 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檔案：<?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檔案：<?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> 控制項TelEdit.java代碼：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檔案部分代碼： 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}
該控制項大致實現方法：eBook繼承FrameLayout，好處在於FrameLayout有圖層效果，後添加的View類能覆蓋前面的View。初始化：定義一個LinearLayout的成員變數mView，將page.xml inflate 成View分別用leftPage，rightPage引用，並初始化其資料，將leftPage，rightPage通過addView添加到mView，然後將mView添加到eBook。在eBook裡定義一個私人類BookView extends View。 並定義成員變數 BookView mBookView； 最後將mBookView添加的eBook中，這樣，mView中的內容為書面內容，mBookView中的內容為特效內容。後續手勢動作：可將各種手勢的特效動作畫於mBookView的畫布中。