Android 图片在SD卡及包下的存储

public class FileBitmap {    /**     * 获取sd卡中的bitmap,bitmap可见     *      * @param bitmap     *            读取bitmap的路径     * @return bitmap     */    public static Bitmap getBitmapByPath(String fileNameString, String bitmapURL) {        String bitmapName = bitmapURL.substring(bitmapURL.lastIndexOf("/") + 1);        fileNameString = fileNameString + "/" + bitmapName;        BitmapFactory.Options options = new BitmapFactory.Options();        Bitmap bm = BitmapFactory.decodeFile(Environment.getExternalStorageDirectory()+fileNameString, options);        return bm;    }    /**     * 在SD卡中存储bitmap,bitmap可见     *      * @param fileName     *            保存bitmap的文件夹路径     * @param bitName     *            bitmap的路径     * @param mBitmap     *            要保存的bitmap     * @throws IOException     */    public static void saveMyBitmap(String fileName, String bitmapURL,            Bitmap mBitmap) throws IOException {        String bitmapName = bitmapURL.substring(bitmapURL.lastIndexOf("/") + 1); // 传入一个远程图片的url，然后取最后的图片名字        File tmp = new File(Environment.getExternalStorageDirectory()+fileName);                if (!tmp.exists()) {            tmp.mkdir();        }        File f = new File(Environment.getExternalStorageDirectory()+fileName+"/"+bitmapURL);        f.createNewFile();        FileOutputStream fOut = null;        try {            fOut = new FileOutputStream(f);        } catch (FileNotFoundException e) {            e.printStackTrace();        }        mBitmap.compress(Bitmap.CompressFormat.PNG, 100, fOut);                try {            fOut.flush();            fOut.close();        } catch (IOException e) {            e.printStackTrace();        }    }        /*     * 保存图片到本地,这个是把图片压缩成字节流然后保存到本地，所以本地的图片是无法显示的     *      * @param mBitmap     *      * @param imageURL     *      * @param cxt     */    public static void saveBitmap(Bitmap mBitmap, String imageURL, Context cxt) {        String bitmapName = imageURL.substring(imageURL.lastIndexOf("/") + 1); // 传入一个远程图片的url，然后取最后的图片名字        ByteArrayOutputStream stream = new ByteArrayOutputStream();        mBitmap.compress(Bitmap.CompressFormat.PNG, 100, stream);        byte[] byteArray = stream.toByteArray();        FileOutputStream fos = null;        ObjectOutputStream oos = null;        try {            fos = cxt.openFileOutput(bitmapName, Context.MODE_PRIVATE);            oos = new ObjectOutputStream(fos);            oos.writeObject(byteArray);        } catch (Exception e) {            e.printStackTrace();            // 这里是保存文件产生异常        } finally {            if (fos != null) {                try {                    fos.close();                } catch (IOException e) {                    // fos流关闭异常                    e.printStackTrace();                }            }            if (oos != null) {                try {                    oos.close();                } catch (IOException e) {                    // oos流关闭异常                    e.printStackTrace();                }            }        }    }    /**     * 读取本地私有文件夹的图片     *      * @param name     * @param cxt     * @return     */    public static Bitmap getBitmap(String fileName, Context cxt) {        String bitmapName = fileName.substring(fileName.lastIndexOf("/") + 1);        FileInputStream fis = null;        ObjectInputStream ois = null;        try {            fis = cxt.openFileInput(bitmapName);            ois = new ObjectInputStream(fis);            byte[] byteArray = (byte[]) ois.readObject();            Bitmap bitmap = BitmapFactory.decodeByteArray(byteArray, 0,                    byteArray.length);            return bitmap;        } catch (Exception e) {            e.printStackTrace();            // 这里是读取文件产生异常        } finally {            if (fis != null) {                try {                    fis.close();                } catch (IOException e) {                    // fis流关闭异常                    e.printStackTrace();                }            }            if (ois != null) {                try {                    ois.close();                } catch (IOException e) {                    // ois流关闭异常                    e.printStackTrace();                }            }        }        // 读取产生异常，返回null        return null;    }}
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