摘要：
˃userEnvironment=类。姓名；MethodgetExternalDirs=用户环境。getDeclaredMethod；获取外部目录。setAccessible；//==========获取构造UserEnvironment所需的参数UserId===============类˂？
private static String getStoragePath(Context mContext, boolean is_removale) {
StorageManager mStorageManager = (StorageManager) mContext.getSystemService(Context.STORAGE_SERVICE);
Class<?> storageVolumeClazz = null;
try {
storageVolumeClazz = Class.forName("android.os.storage.StorageVolume");
Method getVolumeList = mStorageManager.getClass().getMethod("getVolumeList");
Method getPath = storageVolumeClazz.getMethod("getPath");
Method isRemovable = storageVolumeClazz.getMethod("isRemovable");
Object result = getVolumeList.invoke(mStorageManager);
final int length = Array.getLength(result);
for (int i = 0; i < length; i++) {
Object storageVolumeElement = Array.get(result, i);
String path = null;
try {
path = (String) getPath.invoke(storageVolumeElement);
} catch (InvocationTargetException e) {
e.printStackTrace();
}
boolean removable = (Boolean) isRemovable.invoke(storageVolumeElement);
if (is_removale == removable) {
return path;
}
}
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
} catch (NoSuchMethodException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}
return null;
}
/**
* 6.0使用此方法获取外置SD卡路径，尝试过反射{@link StorageManager#getVolumeList}
* 但StorageVolume非Public API 编译不通过（7.0改为公开API）,故使用UserEnvironment
* 的内部方法getExternalDirs获取所有的路径，通过{@link Environment#isExternalStorageRemovable(File)}
* 判断若removable则为外部存储
*/
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
//@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
private static String getPhysicalExternalFilePathAboveM(){
try {
//===========================获取UserEnvironment================
Class<?> userEnvironment = Class.forName("android.os.Environment$UserEnvironment");
Method getExternalDirs =userEnvironment.getDeclaredMethod("getExternalDirs");
getExternalDirs.setAccessible(true);
//========获取构造UserEnvironment的必要参数UserId================
Class<?> userHandle = Class.forName("android.os.UserHandle");
Method myUserId = userHandle.getDeclaredMethod("myUserId");
myUserId.setAccessible(true);
int mUserId = (int) myUserId.invoke(UserHandle.class);
Constructor<?> declaredConstructor = userEnvironment.getDeclaredConstructor(Integer.TYPE);
// 得到UserEnvironment instance
Object instance = declaredConstructor.newInstance(mUserId);
File[] files = (File[]) getExternalDirs.invoke(instance);
for (int i = 0; i < files.length; i++) {
if (Environment.isExternalStorageRemovable(files[i])){
return files[i].getPath();
}
}
} catch (Exception e) {
}
return "";
}
使用sd卡权限前请求权限
public void getPermissions(){
if (Build.VERSION.SDK_INT >= 23) {
int REQUEST_CODE_PERMISSION_STORAGE = 100;
String[] permissions = {
Manifest.permission.READ_EXTERNAL_STORAGE,
Manifest.permission.WRITE_EXTERNAL_STORAGE//, "android.permission.WRITE_MEDIA_STORAGE"
};
this.requestPermissions(permissions,REQUEST_CODE_PERMISSION_STORAGE);
// for (String str : permissions) {
// if (this.checkSelfPermission(str) != PackageManager.PERMISSION_GRANTED) {
// this.requestPermissions(permissions, REQUEST_CODE_PERMISSION_STORAGE);
// return;
// }
// }
}
}