Y U NO PROVIDE API TO GET REMOVABLE SD CARD?

RemovableStorageFinder.java

/*
 * Copyright (C) 2016 Jared Rummler <[email protected]>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

import android.content.Context;
import android.os.Build;
import android.os.IBinder;

import java.io.File;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;

public class RemovableStorageFinder {

  public static File getRemovabeStorageDir(Context context) {
    try {
      List<File> storages = getRemovabeStorages(context);
      if (!storages.isEmpty()) {
        return storages.get(0);
      }
    } catch (Exception ignored) {
    }
    final String SECONDARY_STORAGE = System.getenv("SECONDARY_STORAGE");
    if (SECONDARY_STORAGE != null) {
      return new File(SECONDARY_STORAGE.split(":")[0]);
    }
    return null;
  }

  public static List<File> getRemovabeStorages(Context context) throws Exception {
    List<File> storages = new ArrayList<>();

    Method getService = Class.forName("android.os.ServiceManager")
        .getDeclaredMethod("getService", String.class);
    if (!getService.isAccessible()) getService.setAccessible(true);
    IBinder service = (IBinder) getService.invoke(null, "mount");

    Method asInterface = Class.forName("android.os.storage.IMountService$Stub")
        .getDeclaredMethod("asInterface", IBinder.class);
    if (!asInterface.isAccessible()) asInterface.setAccessible(true);
    Object mountService = asInterface.invoke(null, service);

    Object[] storageVolumes;
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
      String packageName = context.getPackageName();
      int uid = context.getPackageManager().getPackageInfo(packageName, 0).applicationInfo.uid;
      Method getVolumeList = mountService.getClass().getDeclaredMethod(
          "getVolumeList", int.class, String.class, int.class);
      if (!getVolumeList.isAccessible()) getVolumeList.setAccessible(true);
      storageVolumes = (Object[]) getVolumeList.invoke(mountService, uid, packageName, 0);
    } else {
      Method getVolumeList = mountService.getClass().getDeclaredMethod("getVolumeList");
      if (!getVolumeList.isAccessible()) getVolumeList.setAccessible(true);
      storageVolumes = (Object[]) getVolumeList.invoke(mountService, (Object[]) null);
    }

    for (Object storageVolume : storageVolumes) {
      Class<?> cls = storageVolume.getClass();
      Method isRemovable = cls.getDeclaredMethod("isRemovable");
      if (!isRemovable.isAccessible()) isRemovable.setAccessible(true);
      if ((boolean) isRemovable.invoke(storageVolume, (Object[]) null)) {
        Method getState = cls.getDeclaredMethod("getState");
        if (!getState.isAccessible()) getState.setAccessible(true);
        String state = (String) getState.invoke(storageVolume, (Object[]) null);
        if (state.equals("mounted")) {
          Method getPath = cls.getDeclaredMethod("getPath");
          if (!getPath.isAccessible()) getPath.setAccessible(true);
          String path = (String) getPath.invoke(storageVolume, (Object[]) null);
          storages.add(new File(path));
        }
      }
    }

    return storages;
  }

}