小编Hal*_*alo的帖子

我想从存储中仅选择pdf,xlsx和txt文件,但intent.setType只能执行一个文件(仅限eg.txt文件(或)pdf文件).是否可以通过编码intent.setType()来获取所有三个文件,并且有办法吗？

这是我的一些代码.

  private void showFileChooser() {
    Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
    intent.setType("application/pdf");
    intent.addCategory(Intent.CATEGORY_OPENABLE);

    try {
        startActivityForResult(
                Intent.createChooser(intent, "Select txt file"),
                0);
    } catch (android.content.ActivityNotFoundException ex) {
        // Potentially direct the user to the Market with a Dialog

    }
}

我在girdview中使用通用图像加载器.有些视频可以改变图像,有些不起作用并且给出错误,

03-17 12:49:52.287: D/skia(21755): --- SkImageDecoder::Factory returned null
03-17 12:49:52.287: E/ImageLoader(21755): Image can't be decoded [file:////storage/sdcard0/Movies/Naruto Episodes 55.mp4_270x270]

这是我在主类中的代码.

     DisplayImageOptions defaultOptions = new DisplayImageOptions.Builder()
            .cacheOnDisc(true).cacheInMemory(true)
            .imageScaleType(ImageScaleType.EXACTLY)
            .displayer(new FadeInBitmapDisplayer(300)).build();

    ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(
            getApplicationContext())
            .defaultDisplayImageOptions(defaultOptions)
            .memoryCache(new WeakMemoryCache())
            .discCacheSize(100 * 1024 * 1024).build();

    ImageLoader.getInstance().init(config);

这是adpater中的代码,

    String url = "/storage/sdcard0/Movies/Naruto Episodes 55.mp4";


    ImageLoader imageLoader = ImageLoader.getInstance();
    DisplayImageOptions options = new DisplayImageOptions.Builder().cacheInMemory(true)
                    .cacheOnDisc(true).resetViewBeforeLoading(true)
                    .showImageForEmptyUri(R.drawable.x_document_icon)
                    .showImageOnFail(R.drawable.x_document_icon)
                    .showImageOnLoading(R.drawable.x_document_icon).build();

    //initialize image view


    //download and display image from url
    imageLoader.displayImage("file:///"+url, img_btn, options);

以下代码工作正常但需要一些时间.

   Bitmap bitmap = ThumbnailUtils.createVideoThumbnail(url, …