android 内存空间

import java.io.File;

import android.os.Environment;
import android.os.StatFs;

public class MemoryStatus {

static final int ERROR = -1;

static public boolean externalMemoryAvailable() {
return android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED);
}

static public long getAvailableInternalMemorySize() {
File path = Environment.getDataDirectory();
StatFs stat = new StatFs(path.getPath());
long blockSize = stat.getBlockSize();
long availableBlocks = stat.getAvailableBlocks();
return availableBlocks * blockSize;
}

static public long getTotalInternalMemorySize() {
File path = Environment.getDataDirectory();
StatFs stat = new StatFs(path.getPath());
long blockSize = stat.getBlockSize();
long totalBlocks = stat.getBlockCount();
return totalBlocks * blockSize;
}

static public long getAvailableExternalMemorySize() {
if(externalMemoryAvailable()) {
File path = Environment.getExternalStorageDirectory();
StatFs stat = new StatFs(path.getPath());
long blockSize = stat.getBlockSize();
long availableBlocks = stat.getAvailableBlocks();
return availableBlocks * blockSize;
} else {
return ERROR;
}
}

static public long getTotalExternalMemorySize() {
if(externalMemoryAvailable()) {
File path = Environment.getExternalStorageDirectory();
StatFs stat = new StatFs(path.getPath());
long blockSize = stat.getBlockSize();
long totalBlocks = stat.getBlockCount();
return totalBlocks * blockSize;
} else {
return ERROR;
}
}

static public String formatSize(long size) {
String suffix = null;

if (size >= 1024) {
suffix = \"KiB\";
size /= 1024;
if (size >= 1024) {
suffix = \"MiB\";
size /= 1024;
}
}

StringBuilder resultBuffer = new StringBuilder(Long.toString(size));

int commaOffset = resultBuffer.length() - 3;
while (commaOffset > 0) {
resultBuffer.insert(commaOffset, \',\');
commaOffset -= 3;
}

if (suffix != null)
resultBuffer.append(suffix);
return resultBuffer.toString();
}
}