android加载本地文件夹下的所有图片文件

/**
     * 文件夹下图片的真实路径
     */
    private String scanpath;
    /**
     * 所有图片的名字
     */
    public String[] allFiles;
    /**
     * 想要查找的文件夹
     */
    private File folder;
    private List<ImageView> mItems = new Arraylist<>();

 private void initDatafoot() {
        folder = new File(Environment.getExternalStorageDirectory().getAbsolutePath().toString() + "/Draw/ActivityPage");
        /**将文件夹下所有文件名存入数组*/
        allFiles = folder.list();

        if (allFiles.length == 0 ) {//图片
            Toast.makeText(DiscountActivity.this, "暂无图片", Toast.LENGTH_LONG).show();
        } else {
            /**遍历数组*/
            for (int i = 0; i < allFiles.length; i++) {
                scanpath = folder + "/" + allFiles[i];
                Log.i(TAG, "initData: " + scanpath);
                /**将文件转为bitmap如果为空则不是图片文件*/
                Bitmap bitmap = BitmapFactory.decodeFile(scanpath);
                /** 图片写入适配器*/
                ImageView view = new ImageView(this);
                view.setImageBitmap(bitmap);
                view.setScaleType(ImageView.ScaleType.CENTER_CROP);
                mItems.add(view);
            }
        }
    }