Android Open Source - Android-Lib-AsyncImageLoader Disk Cache

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License

The source code is released under:

Apache License

Java Source Code

package android.lib.asyncimageloader;
//w  ww  . j  a va 2  s  . c o m
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import android.graphics.Bitmap;
import android.graphics.Bitmap.CompressFormat;
import android.graphics.BitmapFactory;
import android.media.ThumbnailUtils;
import android.util.Log;

final class DiskCache {
    private static final int THUMBNAIL_QUALITY = 80;

    private static Method createImageThumbnail;

    private final String path;

    public DiskCache(final String path) {
        this.path = path;
    }

    public boolean has(final String path) {
        final File sourceFile = new File(path);

        if (!sourceFile.exists()) {
            return false;
        }

        return new File(this.path, sourceFile.getName()).exists();
    }

    public Bitmap get(final String path) {
        final File sourceFile = new File(path);

        if (!sourceFile.exists()) {
            return null;
        }

        final File thumbnailFile = new File(this.path, sourceFile.getName());

        if (thumbnailFile.exists()) {
            return BitmapFactory.decodeFile(thumbnailFile.getAbsolutePath());
        }

        return null;
    }

    public void put(final String path, final Bitmap bitmap) {
        OutputStream outputStream = null;

        try {
            outputStream = new BufferedOutputStream(new FileOutputStream(path));

            bitmap.compress(CompressFormat.JPEG, DiskCache.THUMBNAIL_QUALITY, outputStream);
        } catch (final FileNotFoundException e) {
            Log.e(this.getClass().getName(), e.getMessage(), e);
        } finally {
            if (outputStream != null) {
                try {
                    outputStream.close();
                } catch (final IOException e) {
                    Log.e(this.getClass().getName(), e.getMessage(), e);
                }
            }
        }
    }

    public Bitmap get(final String path, final int imageKind) {
        final File sourceFile = new File(path);

        if (!sourceFile.exists()) {
            return null;
        }

        final File thumbnailFile = new File(this.path, sourceFile.getName());

        if (thumbnailFile.exists()) {
            return BitmapFactory.decodeFile(thumbnailFile.getAbsolutePath());
        }

        try {
            final Bitmap bitmap = DiskCache.createImageThumbnail(path, imageKind);

            this.put(path, bitmap);

            return bitmap;
        } catch (final IllegalArgumentException e) {
            Log.e(this.getClass().getName(), e.getMessage(), e);
        } catch (final NoSuchMethodException  e) {
            Log.e(this.getClass().getName(), e.getMessage(), e);
        } catch (final IllegalAccessException e) {
            Log.e(this.getClass().getName(), e.getMessage(), e);
        } catch (final InvocationTargetException e) {
            Log.e(this.getClass().getName(), e.getMessage(), e);
        }

        return null;
    }

    private static Bitmap createImageThumbnail(final String path, final int imageKind) throws NoSuchMethodException, IllegalArgumentException, IllegalAccessException, InvocationTargetException {
        if (DiskCache.createImageThumbnail == null) {
            DiskCache.createImageThumbnail = ThumbnailUtils.class.getMethod("createImageThumbnail", String.class, int.class); //$NON-NLS-1$
        }

        return (Bitmap)DiskCache.createImageThumbnail.invoke(null, path, Integer.valueOf(imageKind));
    }
}

Java Source Code List

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