android - 带和不带 SD 卡的设备的/下载文件夹位置

Question

请告诉我 Downloads 文件夹在带 SD 卡和不带 SD 卡的设备上的默认位置是什么。

以及如何检查特定手机是否没有 SD 卡。

Answer 1

要检查设备是否有 SD 卡，您可以使用:Environment.getExternalStorageState() 如果您没有 SD 卡，您可以使用:Environment.getDataDirectory( )

本质上，如果没有SD卡，你可以在设备本地创建自己的目录。我列出了一些可能有帮助的代码:

/*
             * 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

希望这对您有所帮助。