Android Gallery

You see all the images like an album using Gallery.

By: Umesh Ahir

ActivityMain.java

package com.gallery;

import android.app.Activity;

import android.os.Bundle;

public class ActivityMain extends Activity 

{

public void onCreate(Bundle savedInstanceState)

{

        super.onCreate(savedInstanceState);

        

        

        setContentView(R.layout.layout_gallery);

        

        Integer[] images = 

        { 

        R.drawable.ums_aaa, 

        R.drawable.ums_ahir,

                R.drawable.ums_ccc, 

                R.drawable.ums_bbb, 

                R.drawable.ums,

                R.drawable.dhvl,

                R.drawable.dhvlzandu,

                R.drawable.jgr,

                R.drawable.umsjgr

        };

        

        ImageAdapter adapter = new ImageAdapter(this, images);

        adapter.createReflectedImages();

        GalleryFlow galleryFlow = (GalleryFlow) findViewById(R.id.Gallery01);

        galleryFlow.setAdapter(adapter);

        

}

}

GalleryFlow.java

package com.gallery;

import android.content.Context;

import android.graphics.Camera;

import android.graphics.Matrix;

import android.util.AttributeSet;

import android.view.View;

import android.view.animation.Transformation;

import android.widget.Gallery;

import android.widget.ImageView;

public class GalleryFlow extends Gallery {

    private Camera mCamera = new Camera();

    private int mMaxRotationAngle = 60;

    private int mMaxZoom = -120;

    private int mCoveflowCenter;

    public GalleryFlow(Context context) {

            super(context);

            this.setStaticTransformationsEnabled(true);

    }

    public GalleryFlow(Context context, AttributeSet attrs) {

            super(context, attrs);

            this.setStaticTransformationsEnabled(true);

    }

    public GalleryFlow(Context context, AttributeSet attrs, int defStyle) {

            super(context, attrs, defStyle);

            this.setStaticTransformationsEnabled(true);

    }

    public int getMaxRotationAngle() {

            return mMaxRotationAngle;

    }

    public void setMaxRotationAngle(int maxRotationAngle) {

            mMaxRotationAngle = maxRotationAngle;

    }

    public int getMaxZoom() {

            return mMaxZoom;

    }

    public void setMaxZoom(int maxZoom) {

            mMaxZoom = maxZoom;

    }

    private int getCenterOfCoverflow() {

            return (getWidth() - getPaddingLeft() - getPaddingRight()) / 2

                            + getPaddingLeft();

    }

    private static int getCenterOfView(View view) {

            return view.getLeft() + view.getWidth() / 2;

    }

    protected boolean getChildStaticTransformation(View child, Transformation t) {

            final int childCenter = getCenterOfView(child);

            final int childWidth = child.getWidth();

            int rotationAngle = 0;

            t.clear();

            t.setTransformationType(Transformation.TYPE_MATRIX);

            if (childCenter == mCoveflowCenter) {

                    transformImageBitmap((ImageView) child, t, 0);

            } else {

                    rotationAngle = (int) (((float) (mCoveflowCenter - childCenter) / childWidth) * mMaxRotationAngle);

                    if (Math.abs(rotationAngle) > mMaxRotationAngle) {

                            rotationAngle = (rotationAngle < 0) ? -mMaxRotationAngle

                                            : mMaxRotationAngle;

                    }

                    transformImageBitmap((ImageView) child, t, rotationAngle);

            }

            return true;

    }

    protected void onSizeChanged(int w, int h, int oldw, int oldh) {

            mCoveflowCenter = getCenterOfCoverflow();

            super.onSizeChanged(w, h, oldw, oldh);

    }

    private void transformImageBitmap(ImageView child, Transformation t,

                    int rotationAngle) {

            mCamera.save();

            final Matrix imageMatrix = t.getMatrix();

            final int imageHeight = child.getLayoutParams().height;

            final int imageWidth = child.getLayoutParams().width;

            final int rotation = Math.abs(rotationAngle);

          

            mCamera.translate(0.0f, 0.0f, 100.0f);

            // As the angle of the view gets less, zoom in

            if (rotation < mMaxRotationAngle) {

                    float zoomAmount = (float) (mMaxZoom + (rotation * 1.5));

                    mCamera.translate(0.0f, 0.0f, zoomAmount);

            }

           

            mCamera.rotateY(rotationAngle);

            mCamera.getMatrix(imageMatrix);

            imageMatrix.preTranslate(-(imageWidth / 2), -(imageHeight / 2));

            imageMatrix.postTranslate((imageWidth / 2), (imageHeight / 2));

            mCamera.restore();

    }

}

ImageAdapter.java

package com.gallery;

import android.content.Context;

import android.content.res.Resources;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.graphics.Canvas;

import android.graphics.LinearGradient;

import android.graphics.Matrix;

import android.graphics.Paint;

import android.graphics.PorterDuffXfermode;

import android.graphics.Bitmap.Config;

import android.graphics.PorterDuff.Mode;

import android.graphics.Shader.TileMode;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.ImageView;

import android.widget.ImageView.ScaleType;

public class ImageAdapter extends BaseAdapter {

int mGalleryItemBackground;

private Context mContext;

private Integer[] mImageIds;

private ImageView[] mImages;

public ImageAdapter(Context c, Integer[] ImageIds) {

mContext = c;

mImageIds = ImageIds;

mImages = new ImageView[mImageIds.length];

}

public boolean createReflectedImages() {

final int reflectionGap = 4;

int index = 0;

for (int imageId : mImageIds) {

Bitmap originalImage = BitmapFactory.decodeResource(mContext

.getResources(), imageId);

int width = originalImage.getWidth();

int height = originalImage.getHeight();

Matrix matrix = new Matrix();

matrix.preScale(1, -1);

Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0,

height / 2, width, height / 2, matrix, false);

Bitmap bitmapWithReflection = Bitmap.createBitmap(width,

(height + height / 2), Config.ARGB_8888);

Canvas canvas = new Canvas(bitmapWithReflection);

canvas.drawBitmap(originalImage, 0, 0, null);

Paint deafaultPaint = new Paint();

canvas.drawRect(0, height, width, height + reflectionGap,

deafaultPaint);

canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);

Paint paint = new Paint();

LinearGradient shader = new LinearGradient(0, originalImage

.getHeight(), 0, bitmapWithReflection.getHeight()

+ reflectionGap, 0x70ffffff, 0x00ffffff, TileMode.CLAMP);

paint.setShader(shader);

paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));

canvas.drawRect(0, height, width, bitmapWithReflection.getHeight()

+ reflectionGap, paint);

ImageView imageView = new ImageView(mContext);

imageView.setImageBitmap(bitmapWithReflection);

imageView.setLayoutParams(new GalleryFlow.LayoutParams(180, 240));

// imageView.setScaleType(ScaleType.MATRIX);

mImages[index++] = imageView;

}

return true;

}

private Resources getResources() {

// TODO Auto-generated method stub

return null;

}

public int getCount() {

return mImageIds.length;

}

public Object getItem(int position) {

return position;

}

public long getItemId(int position) {

return position;

}

public View getView(int position, View convertView, ViewGroup parent) {

return mImages[position];

}

public float getScale(boolean focused, int offset) {

return Math.max(0, 1.0f / (float) Math.pow(2, Math.abs(offset)));

}

}

layout_gallery.xml

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:orientation="vertical"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:background="#ffffff"

    >

<com.gallery.GalleryFlow 

android:id="@+id/Gallery01" 

android:layout_width="fill_parent" 

android:layout_height="wrap_content" android:layout_centerInParent="true"/>

</RelativeLayout>

ScreenShot