检查查看器以在Android棒棒糖中打开文件

在android/Hybrid应用程序中，我使用以下代码检查“是否在设备上安装了查看器以打开文件”

在Android棒棒糖上，如果只有默认的PDF查看器（即“驱动PDF查看器”）存在，则上面的代码返回false作为

PackageManager.MATCH_DEFAULT_ONLY

正在返回空数组。 此外，上述代码在以前版本的Android上运行良好

用Android棒棒糖在Nexus4和Nexus5上测试

   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();
    }

}

---

你想那样吗？或者只是检查一下？

我不明白你在说什么，你是说检查是否有打开文件的应用程序？是的，我的意思是是否安装了打开特定文件类型的应用程序，例如pdf、doc、zip等。我们将文件类型作为属性传递给函数“fileExt”。如果有查看器，我需要检查并打开文件。在您的建议中，若用户并没有在设备上安装pdf viewer或禁用它，会发生什么情况？

   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();
    }

}