判断手机是否处于USB模式（手机是否作为存储连接到PC）

if(Utils.getPhoneStorage() !=null && Utils.getPhoneStorage().total ==0)

//处于USB模式

Utils.java

public static File getPhoneDirMtk(){

    //if(isSDCardReady()){

     // return new File("/mnt/sdcard");

    // }else{

    //return new File("/mnt/sdcard2");

    //}

    String path  = StorageManagerEx.getInternalStoragePath();

return new File(path);

    //return new File("/sdcard");

    // } Modify by hyman 20131231

    }

public static class PhoneStorageInfo {

        public long total;

        public long free;

    }

public static PhoneStorageInfo getPhoneStorage(){

   

    File pathFile = getPhoneDirMtk();

    //StorageManager mStorageManager = (StorageManager)context.getSystemService(Context.STORAGE_SERVICE);

        try {

            android.os.StatFs statfs = new android.os.StatFs(pathFile.getPath());

long blockSize = statfs.getBlockSize();

            long availableBlocks = statfs.getAvailableBlocks();

            long blockTotalSize = statfs.getBlockSize();

            long totalBlocks = statfs.getBlockCount();

PhoneStorageInfo info = new PhoneStorageInfo();

            info.total = blockTotalSize * totalBlocks;

            info.free = blockSize * availableBlocks;

            return info;

} catch (IllegalArgumentException e) {

            

        }

        return null;

}

其中，getPhoneDirMtk中使用mtk的库函数。 如果不是mtk手机，请换成，

public static File getPhoneDir() {

if (isSDCardReady()) {

return new File("/storage/sdcard1");

} else {

return new File("/storage/sdcard0");

}

}