如下代码查看存储设备(路径/storage/external_storage/sda1/)剩余空间:
import android.os.StatFs; public class FreeDisk { public static void main(String[] args) { System.out.println("\nFreeMemory = " + FreeMemory("/storage/external_storage/sda1/")); } public static int FreeMemory(String path) { StatFs statFs = new StatFs(path); int Free = (statFs.getAvailableBlocks() * statFs.getBlockSize()) / 1048576; long LongFree = ((long)statFs.getAvailableBlocks() * (long)statFs.getBlockSize()) / 1048576l; double DoubleFree = ((double)statFs.getAvailableBlocks() * (double)statFs.getBlockSize()) / 1048576; System.out.println("statFs.getAvailableBlocks() = " + statFs.getAvailableBlocks()); System.out.println("statFs.getBlockSize() = " + statFs.getBlockSize()); System.out.println("Free = " + Free); System.out.println("LongFree = " + LongFree); System.out.println("DoubleFree = " + DoubleFree); return Free; } }
使用以下shell可以完成代码的执行:
#android.jar位于Android SDK下的platforms/android-xx目录下,把它配置在类库路径下 javac -classpath android.jar FreeDisk.java #Android的dx工具,将classes文件编译为字节码dex文件 dx --dex --output=classes.dex FreeDisk.class zip FreeDisk.zip classes.dex adb push FreeDisk.zip /mnt/sdcard/ adb shell mkdir /mnt/sdcard/dalvik-cache #在Android设备上执行代码 adb shell ANDROID_DATA=/mnt/sdcard dalvikvm -cp /mnt/sdcard/FreeDisk.zip FreeDisk
理论来说,int只有32位大小,只能够查看4GB内存大小;而long有64位大小,能够查看16EB大小。所以一般的需要使用long来记录大小。
B 比特bit 1 kB = 1024 B (kB - kilobajt) 千 1 MB = 1024 kB (MB - megabajt) 兆 1 GB = 1024 MB (GB - gigabajt) 吉 1 TB = 1024 GB (TB - terabajt) 太 1 PB = 1024 TB (PB - petabajt) 拍 1 EB = 1024 PB (EB - eksabajt) 艾 1 ZB = 1024 EB (ZB - zettabajt) 皆 1 YB = 1024 ZB (YB - jottabajt) 佑 1 BB = 1024 JB (BB - brontobajt)