Android Open Source - ImageGrabber Utils

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Back to project page ImageGrabber.

License

The source code is released under:

Apache License

Java Source Code

package com.herroworld.imagegrabber;
//from   w w w .ja va  2s .c o m
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;

import java.io.File;

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

    private Utils() {
    };

    /**
     * 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 (Build.VERSION.SDK_INT < Build.VERSION_CODES.FROYO) {
            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 (Build.VERSION.SDK_INT >= Build.VERSION_CODES.FROYO) {
            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();
    }
}

Java Source Code List

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