请让我知道什么是下载文件夹中有和没有SD卡设备的默认位置。

Please let me know what are default locations for Downloads folder on devices with and without SD card.

和我怎么能检查是否特定的手机没有SD卡。

And how can I check if particular phone doesn't have SD card.

推荐答案

要检查，看看设备是否具有SD卡，可以使用： Environment.getExternalStorageState（）如果你没有SD卡，可以使用： Environment.getDataDirectory（）

To check and see if a device has an SD card, you use: Environment.getExternalStorageState() if you don't have an SD card, you use: Environment.getDataDirectory()

从本质上讲，如果没有SD卡，您可以在本地创建自己的设备上的目录。我列出了一些code，可以帮助：

Essentially, if there is no SD card, you can create your own directory on the device locally. I've listed some code that might help:

/*
             * This sections checks the phone to see if there is a SD card. if
             * there is an SD card, a directory is created on the SD card to
             * store the test log results. If there is not a SD card, then the
             * directory is created on the phones internal hard drive
             */
                    //if there is no SD card, create new directory objects to make directory on device
            if (Environment.getExternalStorageState() == null) {
                            //create new file directory object
                directory = new File(Environment.getDataDirectory()
                        + "/RobotiumTestLog/");
                photoDirectory = new File(Environment.getDataDirectory()
                        + "/Robotium-Screenshots/");
                /*
                 * this checks to see if there are any previous test photo files
                 * if there are any photos, they are deleted for the sake of
                 * memory
                 */
                if (photoDirectory.exists()) {
                    File[] dirFiles = photoDirectory.listFiles();
                    if (dirFiles.length != 0) {
                        for (int ii = 0; ii <= dirFiles.length; ii++) {
                            dirFiles[ii].delete();
                        }
                    }
                }
                // if no directory exists, create new directory
                if (!directory.exists()) {
                    directory.mkdir();
                }

                // if phone DOES have sd card
            } else if (Environment.getExternalStorageState() != null) {
                // search for directory on SD card
                directory = new File(Environment.getExternalStorageDirectory()
                        + "/RobotiumTestLog/");
                photoDirectory = new File(
                        Environment.getExternalStorageDirectory()
                                + "/Robotium-Screenshots/");
                if (photoDirectory.exists()) {
                    File[] dirFiles = photoDirectory.listFiles();
                    if (dirFiles.length > 0) {
                        for (int ii = 0; ii < dirFiles.length; ii++) {
                            dirFiles[ii].delete();
                        }
                        dirFiles = null;
                    }
                }
                // if no directory exists, create new directory to store test
                // results
                if (!directory.exists()) {
                    directory.mkdir();
                }
            }// end of SD card checking

希望这有助于。

Hope this helps.