我是android的新手,我尝试了很多代码,但无法获得路径。 但是使用下面的代码,我得到了外部Sdcard的路径,但是无法访问外部Sdcard目录。
public static List<StorageInfo> getStorageList() {
List<StorageInfo> list = new ArrayList<StorageInfo>();
String def_path = Environment.getExternalStorageDirectory().getPath();
boolean def_path_internal = !Environment.isExternalStorageRemovable();
String def_path_state = Environment.getExternalStorageState();
boolean def_path_available = def_path_state.equals(Environment.MEDIA_MOUNTED)
|| def_path_state.equals(Environment.MEDIA_MOUNTED_READ_ONLY);
boolean def_path_readonly = Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED_READ_ONLY);
BufferedReader buf_reader = null;
try {
HashSet<String> paths = new HashSet<String>();
buf_reader = new BufferedReader(new FileReader("/proc/mounts"));
String line;
int cur_display_number = 1;
while ((line = buf_reader.readLine()) != null) { if (line.contains("vfat") || line.contains("/mnt")) {
StringTokenizer tokens = new StringTokenizer(line, " ");
String unused = tokens.nextToken(); //device
String mount_point = tokens.nextToken(); //mount point
if (paths.contains(mount_point)) {
continue;
}
unused = tokens.nextToken(); //file system
List<String> flags = Arrays.asList(tokens.nextToken().split(",")); //flags
boolean readonly = flags.contains("ro");
if (mount_point.equals(def_path)) {
paths.add(def_path);
list.add(0, new StorageInfo(def_path, def_path_internal, readonly, -1));
} else if (line.contains("/dev/block/vold")) {
if (!line.contains("/mnt/secure")
&& !line.contains("/mnt/asec")
&& !line.contains("/mnt/obb")
&& !line.contains("/dev/mapper")
&& !line.contains("tmpfs")) {
paths.add(mount_point);
list.add(new StorageInfo(mount_point, false, readonly, cur_display_number++));
}
}
}
}
if (!paths.contains(def_path) && def_path_available) {
list.add(0, new StorageInfo(def_path, def_path_internal, def_path_readonly, -1));
}
} catch (FileNotFoundException ex) {
ex.printStackTrace();
} catch (IOException ex) {
ex.printStackTrace();
} finally {
if (buf_reader != null) {
try {
buf_reader.close();
} catch (IOException ex) {} }
}
return list;
}
如何访问Sd卡目录。
答案 0 :(得分:0)
从android 23+开始,你需要获得用户写入手机外部存储的权限。通过在清单中添加以下内容来执行此操作:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
如果这不能让您访问SD卡,那么在尝试访问该卡之前,您可能需要在运行时请求许可。这是一个例子:
public void checkPermissions() {
String[] tmp = {"WRITE_EXTERNAL_STORAGE"};
for (String s : tmp) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (!hasPermissionInManifest(getBaseContext(), s)) {
if (checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE)
!= PackageManager.PERMISSION_GRANTED) {
requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
}
}
}
}
}
您需要具有访问手机和相机中其他传感器的权限,这可以通过类似方式完成。您可以像这样获取外部存储的路径:
Environment.getExternalStorageDirectory().toString();