调用Android系统接口获取不到TF卡路径时

private String getExternalStoragePath() {
String value = "";

try {
if (!Environment.isExternalStorageEmulated() && Environment.isExternalStorageRemovable()
&& Environment.getExternalStorageDirectory().canWrite()) {
value = Environment.getExternalStorageDirectory().getPath();
} else {
final String[] sdPathArray = {"/storage/extSdCard",
"/storage/sdcard1",
"/mnt/sdcard2",
"/mnt/sdcard-ext",
"/mnt/ext_sdcard",
"/mnt/sdcard/SD_CARD",
"/mnt/sdcard/extra_sd",
"/mnt/extrasd_bind",
"/mnt/sdcard/ext_sd",
"/mnt/sdcard/external_SD"};
for (String path : sdPathArray) {
File file = new File(path);
if (file.isDirectory() && file.canRead() && file.canWrite()) {
value = path;
break;
}
}
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

return value;
}