android M:第三方apk擷取OTG(U盤)和sdcard路徑

Android M上,每次挂載OTG的時候,顯示的裝置是不一樣的.這樣子無法去判斷挂載的裝置的路徑和區分sdcard與OTG(U盤).

網上查找了大量的文檔,檢視android源碼,找到一個思路.做法是根據partition.diskId來區分的.

直接上代碼:      

public void getDiskInfo() {
    StorageManager mstorageManager = (StorageManager)this.getApplicationContext().getSystemService(Context.STORAGE_SERVICE);
    try {
        Method methodGetDisks = StorageManager.class.getMethod("getDisks");
        Method methodGetStorageVolumes = StorageManager.class.getMethod("getVolumeList");
        Method getVolumeById = StorageManager.class.getMethod("findVolumeById", String.class);

        StorageVolume[] storageVolumes = (StorageVolume[]) methodGetStorageVolumes.invoke(mstorageManager);
        List disks = (List) methodGetDisks.invoke(mstorageManager);

        //DiskInfo
        Class<?> diskIndoClass = Class.forName("android.os.storage.DiskInfo");
        Method mGetDiskId = diskIndoClass.getMethod("getId");
        Field diskName = diskIndoClass.getField("label");

        //StorageVolume
        Class<?> storageVolumeClass = Class.forName("android.os.storage.StorageVolume");
        Method mGetStorageVolId = storageVolumeClass.getMethod("getId");
        Method mGetStorageVolDescription = storageVolumeClass.getMethod("getDescription", Context.class);
        Method mGetStorageVolPath = storageVolumeClass.getMethod("getPath");
        Method isRemovable = storageVolumeClass.getMethod("isRemovable");
        Method getVolumeState = StorageManager.class.getMethod("getVolumeState", String.class);

        //VolumeInfo
        Class<?> volumeClass = Class.forName("android.os.storage.VolumeInfo");
        Method volumeDiskId = volumeClass.getMethod("getDiskId");

        for(int i = 0; i < disks.size(); i++) {
            DiskInfo diskInfo = new DiskInfo();
            Parcelable parcelable = (Parcelable) disks.get(i);
            diskInfo.diskId = (String) mGetDiskId.invoke(parcelable);
            Log.e("test", "diskid : " + diskInfo.diskId);
            String des = (String) diskName.get(parcelable);
            Log.e("test", "diskName : " + des);
            diskInfo.name = des;
            mDiskList.add(diskInfo);
        }

        for(int j = 0; j < storageVolumes.length; j++) {
            DiskPartition partition = new DiskPartition();
            StorageVolume storageVolume = storageVolumes[j];
            partition.partitionId = (String) mGetStorageVolId.invoke(storageVolume);
            if("emulated".equals(partition.partitionId)) { continue; }
            partition.name = (String) mGetStorageVolDescription.invoke(storageVolume, this);
            partition.path = (String) mGetStorageVolPath.invoke(storageVolume);
            Boolean removeAble = ((Boolean) isRemovable.invoke(storageVolume)).booleanValue();
            String state = (String) getVolumeState.invoke(mstorageManager, partition.path);
            if("mounted".equals(state) && removeAble) {
                partition.diskId = (String) volumeDiskId.invoke(getVolumeById.invoke(mstorageManager, partition.partitionId));
                for(DiskInfo diskInfo : mDiskList) {
                    if(diskInfo.diskId.equals(partition.diskId)) {
                        getStorageBlockInfo(partition);
                        diskInfo.diskPartitions.add(partition);
                        Log.e("test", "partition.name : " + partition.name);
                        Log.e("test", "partition.diskId : " + partition.diskId);
                        Log.e("test", "partition.path : " + partition.path);
                        String partitionId = partition.diskId;
                        String[] idSplit = partitionId.split(":");
                        if (idSplit != null && idSplit.length == 2) {
                            if (idSplit[1].startsWith("8,")) {
                             usbpath =  partition.path;
                            }else{
                              sdcard =  partition.path;
                            }
                        }
                    }
                }
            }
        }
    } catch (NoSuchMethodException e) {
        e.printStackTrace();
    } catch (InvocationTargetException e) {
        e.printStackTrace();
    } catch (IllegalAccessException e) {
        e.printStackTrace();
    } catch (ClassNotFoundException e) {
        e.printStackTrace();
    } catch (NoSuchFieldException e) {
        e.printStackTrace();
    }
}
demo : https://download.csdn.net/download/wende32/10432599