如何在android中使用默认可用应用程序在android中打开下载的文件

Question

我在下载完成后从服务器下载文件我必须打开一个文件.知道问题是文件可以是任何类型,所以我不能指定和Intent调用打开一个静态名称的文件,就像我们打开一个PDF文件一样.我想要的是当文件下载时,它将搜索是否有任何应用程序可用于打开文件,否则它将显示弹出.我正在做所有这些内部碎片.这是我下载的代码:

public class DownloadFile extends AsyncTask<String, Void, Integer> {
    String file_name = "";
    File sdcard = Environment.getExternalStorageDirectory();
    @Override
    protected Integer doInBackground(String... params) {
        // TODO Auto-generated method stub
        try {
            HttpURLConnection url_conn = null;
            byte[] bffr;

            long totalSize = 0;
            File directory = new File(
                    Environment.getExternalStorageDirectory()
                            + "/xyz/download");
            directory.mkdirs();
            // 06-03 17:57:41.160: D/file name(6882):
            file_name = "";
            file_name = params[0];
            Log.d("file name", file_name.toString());
            url_conn = (HttpURLConnection) (new URL("http://example.com/uploads/" + file_name)).openConnection();
            url_conn.setRequestMethod("GET");
            url_conn.setDoOutput(true);
            url_conn.connect();

            if (url_conn.getContentLength() > 0) {
                File imgFile = new File(sdcard + "/xyz/download/",file_name);
                FileOutputStream fos = new FileOutputStream(imgFile);
                InputStream is = url_conn.getInputStream();
                totalSize = url_conn.getContentLength();
                // Log.d("File Download Size ",totalSize+"");
                long total = 0;
                bffr = new byte[1024];
                int bufferLength = 0;
                while ((bufferLength = is.read(bffr)) > 0) {
                    total += bufferLength;
                    publishProgress("" + (int) ((total * 100) / totalSize));
                    fos.write(bffr, 0, bufferLength);
                }
                fos.close();
            } else
                Log.w(file_name.toString(), "FILE NOT FOUND");
            return 0;
        } catch (Exception e) {
            e.printStackTrace();
            return -1;
        }

    }

    private void publishProgress(String... process) {
        // TODO Auto-generated method stub
        mprogressDialog.setProgress(Integer.parseInt(process[0]));
    }

    protected void onPostExecute(Integer unused) {
        Log.d("after downloading file ", "file downloaded ");
        switch (unused) {
        case 0:
            mprogressDialog.dismiss();
             Intent install = new Intent(Intent.ACTION_VIEW);
                install.setDataAndType(Uri.fromFile(new File(sdcard + "/xyz/download/",file_name)),
                        "MIME-TYPE");
                install.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
               app.getBaseContext().startActivity(install);
            break;
        }
    }
}

在post post中我试图使用Intent打开它,但是没有用.任何想法都表示赞赏

Answer 1

    File file = new File(filePath);
    MimeTypeMap map = MimeTypeMap.getSingleton();
    String ext = MimeTypeMap.getFileExtensionFromUrl(file.getName());
    String type = map.getMimeTypeFromExtension(ext);

    if (type == null)
        type = "*/*";

    Intent intent = new Intent(Intent.ACTION_VIEW);
    Uri data = Uri.fromFile(file);

    intent.setDataAndType(data, type);

    startActivity(intent);

看到这个 ......