package com.solide.imagelibs;

import java.io.File;

import android.annotation.SuppressLint;
import android.app.ActivityManager;
import android.content.Context;
import android.graphics.Bitmap;
import android.os.Build;
import android.os.Environment;
import android.os.StatFs;

/**
 * Class containing some static utility methods.
 */
public class Utils {
    public static final int IO_BUFFER_SIZE = 8 * 1024;
    public static boolean DEBUG = false;

    private Utils() {
    };

    /**
     * Set the debug state.
     */
    public static void set_debug_state(boolean debug) {
        DEBUG = debug;
    }

    /**
     * Workaround for bug pre-Froyo, see here for more info:
     * http://android-developers.blogspot.com/2011/09/androids-http-clients.html
     */
    public static void disableConnectionReuseIfNecessary() {
        // HTTP connection reuse which was buggy pre-froyo
        if (hasHttpConnectionBug()) {
            System.setProperty("http.keepAlive", "false");
        }
    }

    /**
     * Get the size in bytes of a bitmap.
     * 
     * @param bitmap
     * @return size in bytes
     */
    @SuppressLint("NewApi")
    public static int getBitmapSize(Bitmap bitmap) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR1) {
            return bitmap.getByteCount();
        }
        // Pre HC-MR1
        return bitmap.getRowBytes() * bitmap.getHeight();
    }

    /**
     * Check if external storage is built-in or removable.
     * 
     * @return True if external storage is removable (like an SD card), false
     *         otherwise.
     */
    @SuppressLint("NewApi")
    public static boolean isExternalStorageRemovable() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD) {
            return Environment.isExternalStorageRemovable();
        }
        return true;
    }

    /**
     * Get the external app cache directory.
     * 
     * @param context
     *            The context to use
     * @return The external cache dir
     */
    @SuppressLint("NewApi")
    public static File getExternalCacheDir(Context context) {
        if (hasExternalCacheDir()) {
            return context.getExternalCacheDir();
        }

        // Before Froyo we need to construct the external cache dir ourselves
        final String cacheDir = "/Android/data/" + context.getPackageName() + "/cache/";
        return new File(Environment.getExternalStorageDirectory().getPath() + cacheDir);
    }

    /**
     * Check how much usable space is available at a given path.
     * 
     * @param path
     *            The path to check
     * @return The space available in bytes
     */
    @SuppressLint("NewApi")
    public static long getUsableSpace(File path) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD) {
            return path.getUsableSpace();
        }
        final StatFs stats = new StatFs(path.getPath());
        return (long) stats.getBlockSize() * (long) stats.getAvailableBlocks();
    }

    /**
     * Get the memory class of this device (approx. per-app memory limit)
     * 
     * @param context
     * @return
     */
    public static int getMemoryClass(Context context) {
        return ((ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE)).getMemoryClass();
    }

    /**
     * Check if OS version has a http URLConnection bug. See here for more
     * information:
     * http://android-developers.blogspot.com/2011/09/androids-http-clients.html
     * 
     * @return
     */
    public static boolean hasHttpConnectionBug() {
        return Build.VERSION.SDK_INT < Build.VERSION_CODES.FROYO;
    }

    /**
     * Check if OS version has built-in external cache dir method.
     * 
     * @return
     */
    public static boolean hasExternalCacheDir() {
        return Build.VERSION.SDK_INT >= Build.VERSION_CODES.FROYO;
    }

    /**
     * Check if ActionBar is available.
     * 
     * @return
     */
    public static boolean hasActionBar() {
        return Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB;
    }
}

Create Utils.java