android - 检查查看器以在 Android Lollipop 中打开文件

Question

在 android/Hybrid 应用程序中，我使用以下代码来检查“设备上是否安装了打开文件的查看器”

private boolean detectFileViewer(String fileExt) throws InterruptedException,
JSONException {
    try {
        PackageManager packageManager = cordova.getActivity().getPackageManager();
        Intent testIntent = new Intent(Intent.ACTION_VIEW);
        testIntent.setType( MimeTypeMap.getSingleton().getMimeTypeFromExtension(fileExt));
        if (packageManager.queryIntentActivities(testIntent, PackageManager.MATCH_DEFAULT_ONLY).size() > 0) {
            return true;
        } else {
            return false;
        }
    } catch (Exception e) {
        return false;
    }
}

在 Android Lollipop 上，如果只有默认的 PDF 查看器，即“Drive PDF Viewer”存在，上面的代码将返回 false as

PackageManager.MATCH_DEFAULT_ONLY

返回空数组。此外，上面的代码在以前版本的 Android 上运行良好。

在装有 Android Lollipop 的 nexus 4 和 nexus 5 上测试。

Answer 1

   public static void openFile(final Context context, File url, final Activity activity) throws IOException {
    // Create URI
    File file = url;
    Uri uri = Uri.fromFile(file);

    Intent intent = new Intent(Intent.ACTION_VIEW);
    if (url.toString().contains(".doc") || url.toString().contains(".docx")) {
        // Word document
        intent.setDataAndType(uri, "application/msword");
    } else if (url.toString().contains(".pdf")) {
        // PDF file
        intent.setDataAndType(uri, "application/pdf");
    } else if (url.toString().contains(".ppt") || url.toString().contains(".pptx")) {
        // Powerpoint file
        intent.setDataAndType(uri, "application/vnd.ms-powerpoint");
    } else if (url.toString().contains(".xls") || url.toString().contains(".xlsx")) {
        // Excel file
        intent.setDataAndType(uri, "application/vnd.ms-excel");
    } else if (url.toString().contains(".zip") || url.toString().contains(".rar")) {
        // WAV audio file
        intent.setDataAndType(uri, "application/x-wav");
    } else if (url.toString().contains(".rtf")) {
        // RTF file
        intent.setDataAndType(uri, "application/rtf");
    } else if (url.toString().contains(".wav") || url.toString().contains(".mp3")) {
        // WAV audio file
        intent.setDataAndType(uri, "audio/x-wav");
    } else if (url.toString().contains(".gif")) {
        // GIF file
        intent.setDataAndType(uri, "image/gif");
    } else if (url.toString().contains(".jpg") || url.toString().contains(".jpeg") || url.toString().contains(".png")) {
        // JPG file
        intent.setDataAndType(uri, "image/jpeg");
    } else if (url.toString().contains(".txt")) {
        // Text file
        intent.setDataAndType(uri, "text/plain");
    } else if (url.toString().contains(".3gp") || url.toString().contains(".mpg") || url.toString().contains(".mpeg") || url.toString().contains(".mpe") || url.toString().contains(".mp4") || url.toString().contains(".avi")) {
        // Video files
        intent.setDataAndType(uri, "video/*");
    } else {
        intent.setDataAndType(uri, "*/*");
    }
    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    try {
            context.startActivity(intent);
    } catch (ActivityNotFoundException e) {
        Toast.makeText(context, "There isn't any program open this file!!", Toast.LENGTH_SHORT).show();
    }

}

你想要这样吗？还是只是检查一下？