Page Curl effect with Image and Text in Android

1. Create a new project with package name – com.example.curlpagetutorial
2. Edit the main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

     <minh.app.mbook.MyLayout
        android:id="@+id/mainpage"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_weight="1"
        android:background="#FFf3c5d6"
        android:orientation="vertical" />

     <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_weight="9"
        android:gravity="bottom"
        android:orientation="horizontal" >
     <Button
            android:id="@+id/btn_pre"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_weight="1"
            android:text="Back" />
     <Button
            android:id="@+id/btn_next"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_weight="1"
            android:text="Next" />
    </LinearLayout>
</LinearLayout>

3. Create page1.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#ff660000"
    android:orientation="vertical" >

    <ImageView
        android:id="@+id/home"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:background="@drawable/cloud" />

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_weight="9"
        android:gravity="bottom"
        android:orientation="horizontal" >

        <Button
            android:id="@+id/btn_pre"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_weight="1"
            android:background="@android:color/transparent"
            android:text="Back" />

        <Button
            android:id="@+id/btn_next"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_weight="1"
            android:background="@android:color/transparent"
            android:text="Next" />
    </LinearLayout>
</LinearLayout

4. Create another page2.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/text"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_margin="10dp"
        android:text="@string/text"
        android:textSize="20sp"
        android:textStyle="bold" />

</LinearLayout>

5. Now create a new package with name com.example.curlpagetutorial.layout
6. Create a new class in com.example.curlpagetutorial.layout named CustomLayout.java

package com.example.curlpagetutorial.layout;

import android.content.Context;
import android.util.AttributeSet;
import android.widget.RelativeLayout;

public abstract class CustomLayout extends RelativeLayout {
    
    public CustomLayout(Context context) {
        super(context);
        
    }

    public CustomLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        super.onLayout(changed, l, t, r, b);
        try {
            // Init game
            getPageContent();            
        } catch (Exception e) {
            // bug
            e.printStackTrace();
        }
    }

    //
    abstract protected void getPageContent();
}

7. Now create a class for example, TestLayout.java under package name com.example.curlpagetutorial and import the CustomLayout.java class

package com.example.curlpagetutorial;

import com.example.curlpagetutorial.layout.CustomLayout;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.Display;
import android.view.LayoutInflater;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ScrollView;

public class MyLayout extends CustomLayout{
    // Game name
    public static final String NAME = "SpaceBlaster";
    private Context mContext;
    //
    private int screenWidth;
    private int screenHeight;
    private int totalPages;
    //
    private MyBookView mBookView;
    public MyLayout(Context context) {
        super(context);
        mContext = context;
        init();
    }
    public MyLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
        mContext = context;
        init();
    }
    private ScrollView scrollView;
    //
    private void init() {
        totalPages = 2;
        Display display = ((WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();        
        screenWidth = display.getWidth();
        screenHeight = display.getHeight();
        //
        mBookView = new MyBookView(mContext, screenWidth, screenHeight);
        // prepare view to take all screenshoot
        LinearLayout ll = new LinearLayout(mContext);
        ll.setOrientation(LinearLayout.VERTICAL);
        
        LayoutInflater factory = LayoutInflater.from(mContext);    
        View view = factory.inflate(R.layout.page1, null);                
        ll.addView(view, screenWidth,screenHeight);        
        View view2 = factory.inflate(R.layout.page2, null);        
        ll.addView(view2, screenWidth,screenHeight);
        
        // hide scrollview's component to have clear bitmap
        scrollView = new ScrollView(mContext);
        scrollView.addView(ll);
        scrollView.setVerticalScrollBarEnabled(false);
        scrollView.setHorizontalScrollBarEnabled(false);        
        scrollView.setFadingEdgeLength(0);
        addView(scrollView);
        
        // add true view and some actions
        View view3 = factory.inflate(R.layout.page1, null);        
        addView(view3, screenWidth, screenHeight);
        
        View view4 = factory.inflate(R.layout.page2, null);        
        addView(view4, screenWidth, screenHeight);

        addView(mPoemView);        
        mPoemView.setView(view3, view4);                
    }
    //
    public void next(){
        mPoemView.next();
    }
    //
    public void pre(){
        mPoemView.pre();
    }

    private Bitmap mBitmap;
    private Bitmap page1, page2;

    public void getPageContent() {
        if(mBitmap==null){
            setBitmap();
        }
    }
    private void setBitmap() {        
        mBitmap = Bitmap.createBitmap(screenWidth, screenHeight*totalPages, Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(mBitmap);
        scrollView.draw(canvas);

        page1 = Bitmap.createBitmap(screenWidth, screenHeight, Bitmap.Config.ARGB_8888);
        Canvas canvas1 = new Canvas(page1);
        canvas1.drawBitmap(mBitmap, 0, 0, new Paint());
        page2 = Bitmap.createBitmap(screenWidth, screenHeight, Bitmap.Config.ARGB_8888);
        Canvas canvas2 = new Canvas(page2);
        canvas2.drawBitmap(mBitmap, 0, -screenHeight, new Paint());
        //removeAllViews();
        scrollView.setVisibility(View.GONE);
        //
        mPoemView.init(page1, page2);
        //
    }    
}

8. Now create a class MyBookView.java

package com.example.curlpagetutorial;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;

public class MyBookView extends View{
    // MyHandler myHandler = new MyHandler();
    private static int DEFAULT_FLIP_VALUE = 20;
    private static int FLIP_SPEED = 30;
    private long mMoveDelay = 1000 / 30;

    float xTouchValue = DEFAULT_FLIP_VALUE, yTouchValue = DEFAULT_FLIP_VALUE;

    // String result = "";
    class FlippingHandler extends Handler {
        @Override
        public void handleMessage(Message msg) {
            Log.i("Thong bao: ", "Clock Handler is still running");
            MyPoemView.this.flip();
        }

        public void sleep(long delayMillis) {
            this.removeMessages(0);
            sendMessageDelayed(obtainMessage(0), delayMillis);
        }
    }

    FlippingHandler flippingHandler;
    int width;
    int height;
    float oldTouchX, oldTouchY;
    boolean flipping = false;
    boolean next;
    Point A, B, C, D, E, F;
    Bitmap visiblePage;
    Bitmap invisiblePage;
    Paint flipPagePaint;
    boolean flip = false;
    Context context;
    int loadedPages = 0;
    long timeToLoad = 0;
    // boolean loadingDone = false;
    boolean onloading = true;
    boolean onMoving = false;

    public MyBookView(Context context, int width, int height) {
        super(context);
        this.context = context;
        this.width = width;
        this.height = height;
        }

    public void init(Bitmap page1, Bitmap page2) {
        flippingHandler = new FlippingHandler();
        flipPagePaint = new Paint();
        flipPagePaint.setColor(Color.GRAY);
        flipPagePaint.setShadowLayer(5, -5, 5, 0x99000000);
        A = new Point(10, 0);
        B = new Point(width, height);
        C = new Point(width, 0);
        D = new Point(0, 0);
        E = new Point(0, 0);
        F = new Point(0, 0);

        xTouchValue = yTouchValue = DEFAULT_FLIP_VALUE;
        visiblePage = page1;
        invisiblePage = page2;
        onMoving = false;
        flipping = false;

        loadData();
    }

    private void loadData() {
        // listOfPages.add("this is my text");
        onloading = false;
    }

    private View visibleView, invisibleView;
    public void setView(View view1, View view2){
        visibleView = view1;
        invisibleView = view2;
        visibleView.setVisibility(VISIBLE);
        invisibleView.setVisibility(GONE);
        this.setVisibility(GONE);
    }

    public void next(){
        visibleView.setVisibility(GONE);
        this.setVisibility(VISIBLE);
        flipping = true;
        next = true;        
        flip();
    }

    public void pre(){
        swap2Page();
        visibleView.setVisibility(GONE);
        this.setVisibility(VISIBLE);
        flipping = true;
        next = false;
        xTouchValue = width-30;
        flip();
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
         if (!onloading) {
            switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                oldTouchX = event.getX();
                oldTouchY = event.getY();
                flip = true;
                if (oldTouchX > (width >> 1)) {
                    xTouchValue = DEFAULT_FLIP_VALUE;
                    yTouchValue = DEFAULT_FLIP_VALUE;
                    // set invisible page's content
                    next = true;
                } else {
                    // set invisible page's content
                    // invisiblePage.setContent(index-1, null);
                    next = false;
                    swap2Page();
                    xTouchValue = width;
                    yTouchValue = DEFAULT_FLIP_VALUE;
                }
                break;
            case MotionEvent.ACTION_UP:
                if (onMoving) {
                    xTouchValue = width - A.x;
                    onMoving = false;
                }
                flipping = true;
                flip();
                break;
            case MotionEvent.ACTION_MOVE:
                // Log.i("Thong bao: ","x="+x+" y="+y);
                onMoving = true;
                float xMouse = event.getX();
                float yMouse = event.getY();
                xTouchValue -= (xMouse - oldTouchX) / 1;
                yTouchValue -= yMouse - oldTouchY;
                if (xMouse < oldTouchX) {
                    if (!next) {
                        flip = false;
                    }
                    next = true;
                } else {
                    if (next) {
                        flip = false;
                    }
                    next = false;
                }
                oldTouchX = event.getX();
                oldTouchY = event.getY();
                this.invalidate();
                break;
            }
        }
        return true;
    }
    public void flip() {
        if (flipping) {
           if (xTouchValue > width || xTouchValue < DEFAULT_FLIP_VALUE) {
                flipping = false;
                if (!flipping) {
                    if (next) {
                        swap2Page();
                    }
                    flip = false;
                    xTouchValue = DEFAULT_FLIP_VALUE;
                    yTouchValue = DEFAULT_FLIP_VALUE;
                    swap2View();
                }
                return;
            }
            if (next) {
                xTouchValue += FLIP_SPEED;
            } else {
                xTouchValue -= FLIP_SPEED;
            }
            this.invalidate();
            flippingHandler.sleep(mMoveDelay);
        }
    }

 @Override
    protected void onDraw(Canvas canvas) {
        width = getWidth();
        height = getHeight();
        if (flipping) {
            pointGenerate(xTouchValue, width, height);
        } else {
            // pointGenerateII(xTouchValue, yTouchValue, width, height);
            pointGenerate(xTouchValue, width, height);
        }
        // First Page render
        Paint paint = new Paint();
        canvas.drawColor(Color.GRAY);
        canvas.drawBitmap(visiblePage, 0, 0, paint);

        // Second Page Render
        Path pathX = pathOfTheMask();
        canvas.clipPath(pathX);
        canvas.drawBitmap(invisiblePage, 0, 0, paint);
        canvas.restore();
        // Flip Page render

        Path pathX2 = pathOfFlippedPaper();
        canvas.drawPath(pathX2, flipPagePaint);
        pathX = null;
        pathX2 = null;
        paint = null;
    }

    private Path pathOfTheMask() {
        Path path = new Path();
        path.moveTo(A.x, A.y);
        path.lineTo(B.x, B.y);
        path.lineTo(C.x, C.y);
        path.lineTo(D.x, D.y);
        path.lineTo(A.x, A.y);
         return path;
    }

    private Path pathOfFlippedPaper() {
        Path path = new Path();
        path.moveTo(A.x, A.y);
        path.lineTo(D.x, D.y);
        path.lineTo(E.x, E.y);
        path.lineTo(F.x, F.y);
        path.lineTo(A.x, A.y);
        return path;
    }

    private void pointGenerate(float distance, int width, int height) {
        float xA = width - distance;
        float yA = height;      
        float xD = 0;
        float yD = 0;
        if (xA > width / 2) {
            xD = width;
            yD = height - (width - xA) * height / xA;
        } else {
            xD = 2 * xA;
            yD = 0;
        }        

        double a = (height - yD) / (xD + distance - width);
        double alpha = Math.atan(a);
        double _cos = Math.cos(2 * alpha), _sin = Math.sin(2 * alpha);
        // E
        float xE = (float) (xD + _cos * (width - xD));
        float yE = (float) -(_sin * (width - xD));
        // F
        float xF = (float) (width - distance + _cos * distance);
        float yF = (float) (height - _sin * distance);
        if (xA > width / 2) {
            xE = xD;
            yE = yD;
        }
        A.x = xA;
        A.y = yA;
        D.x = xD;
        D.y = yD;
        E.x = xE;
        E.y = yE;
        F.x = xF;
        F.y = yF;
    }
    float oldxF = 0, oldyF = 0;

    private void pointGenerateII(float xTouch, float yTouch, int width, int height) {
        float yA = height;
        float xD = width;
        float xF = width - xTouch + 0.1f;
        float yF = height - yTouch + 0.1f;
        if (A.x == 0) {
            xF = Math.min(xF, oldxF);
            yF = Math.max(yF, oldyF);
        }
        float deltaX = width - xF;
        float deltaY = height - yF;
        float BH = (float) (Math.sqrt(deltaX * deltaX + deltaY * deltaY) / 2);
        double tangAlpha = deltaY / deltaX;
        double alpha = Math.atan(tangAlpha);
        double _cos = Math.cos(alpha), _sin = Math.sin(alpha);
        float xA = (float) (width - (BH / _cos));
        float yD = (float) (height - (BH / _sin));
        xA = Math.max(0, xA);
        if (xA == 0) {
            oldxF = xF;
            oldyF = yF;
        }
        float xE = xD;
        float yE = yD;
        if (yD < 0) {
            xD = width + (float) (tangAlpha * yD);
            yE = 0;
            xE = width + (float) (Math.tan(2 * alpha) * yD);
        }        
        A.x = xA;
        A.y = yA;
        D.x = xD;
        D.y = Math.max(0, yD);
        E.x = xE;
        E.y = yE;
        F.x = xF;
        F.y = yF;
    }

    private void swap2Page() {
        Bitmap temp = visiblePage;
        visiblePage = invisiblePage;
        invisiblePage = temp;
        temp = null;
    }
    private void swap2View(){
        View t = visibleView;
        visibleView = invisibleView;
        invisibleView = t;
        t=null;

        visibleView.setVisibility(VISIBLE);
        this.setVisibility(GONE);
    }
}

9. Create the MainBook.java class

package com.example.curlpagetutorial;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;

public class MainBook extends Activity{
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        final MyLayout page = (MyLayout) findViewById(R.id.mainpage);
        View pre = findViewById(R.id.btn_pre);
        pre.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                page.pre();              
            }
        });
        View next = findViewById(R.id.btn_next);
        next.setOnClickListener(new OnClickListener() {            
            @Override
            public void onClick(View v) {
                page.next();               
            }
        });
    }           
    @Override
    protected void onPause() {
        super.onPause();
        onStop();
    }
}

10. Create Point.java class

package com.example.curlpagetutorial;
public class Point {
    float x;
    float y;
    public Point(float x, float y){
        this.x = x;
        this.y = y;
    }   
}

11. Manifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.curlpagetutorial"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="4" />

    <application
        android:configChanges="keyboardHidden|orientation"
        android:icon="@drawable/icon"
        android:label="@string/app_name"
        android:screenOrientation="portrait" >
        <activity
            android:name=".MainBook"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

 

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3 thoughts on “Page Curl effect with Image and Text in Android

  1. […] Source: Page Curl effect with Image and Text in Android […]

    Like

  2. plz show the output

    Like

  3. you have to put images for need to get better idea

    Like

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