Android设备内存和SD卡操作工具类

package cc.c;

import java.io.File;
import java.util.List;
import android.os.StatFs;
import java.io.FileReader;
import java.io.IOException;
import java.io.BufferedReader;
import android.os.Environment;
import android.content.Context;
import android.app.ActivityManager;
import android.app.ActivityManager.MemoryInfo;
import android.app.ActivityManager.RunningAppProcessInfo;

public class StorageUtil {
private static final int ERROR = -1;
public static int save_dir = 1;

//推断是否已经安装SD卡
public static boolean isSDCardExist() {
return android.os.Environment.getExternalStorageState().equals(
android.os.Environment.MEDIA_MOUNTED);
}

//内存清理
//注意权限:
//<uses-permission android:name="android.permission.KILL_BACKGROUND_PROCESSES" />
public static void cleanMemory(Context context){
System.out.println("---> 清理前可用内存:"+getAvailMemory(context)+"MB");
ActivityManager activityManager=(ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
RunningAppProcessInfo runningAppProcessInfo=null;
List<RunningAppProcessInfo>  runningAppProcessInfoList= activityManager.getRunningAppProcesses();
//List<ActivityManager.RunningServiceInfo> serviceInfos = mActivityManager.getRunningServices(100);

if (runningAppProcessInfoList != null) {
for (int i = 0; i < runningAppProcessInfoList.size(); ++i) {
runningAppProcessInfo= runningAppProcessInfoList.get(i);
// 一般数值大于RunningAppProcessInfo.IMPORTANCE_SERVICE
// 的进程即为长时间未使用进程或者空进程
// 一般数值大于RunningAppProcessInfo.IMPORTANCE_VISIBLE
// 的进程都是非可见进程,即在后台执行
if (runningAppProcessInfo.importance > RunningAppProcessInfo.IMPORTANCE_VISIBLE) {
String[] pkgList = runningAppProcessInfo.pkgList;
for (int j = 0; j < pkgList.length; ++j) {
System.out.println("===> 正在清理:"+pkgList[j]);
activityManager.killBackgroundProcesses(pkgList[j]);
}
}

}
}
System.out.println("---> 清理后可用内存:"+getAvailMemory(context)+"MB");
}

//获取内存总大小
public static long getTotalMemory() {
//系统的内存信息文件
String filePath = "/proc/meminfo";
String lineString;
String[] stringArray;
long totalMemory = 0;
try {
FileReader fileReader = new FileReader(filePath);
BufferedReader bufferedReader = new BufferedReader(fileReader,1024 * 8);
//读取meminfo第一行,获取系统总内存大小
lineString = bufferedReader.readLine();
//依照空格拆分
stringArray = lineString.split("\\s+");
//获得系统总内存,单位KB
totalMemory = Integer.valueOf(stringArray[1]).intValue();
bufferedReader.close();
} catch (IOException e) {
}
return totalMemory / 1024;
}

//获取可用内存大小
public static long getAvailMemory(Context context) {
ActivityManager activityManager=(ActivityManager)context.getSystemService(Context.ACTIVITY_SERVICE);
MemoryInfo memoryInfo = new MemoryInfo();
activityManager.getMemoryInfo(memoryInfo);
return memoryInfo.availMem / (1024 * 1024);
}

//SD卡剩余空间
public static long getAvailableExternalMemorySize() {
if (isSDCardExist()) {
File path = Environment.getExternalStorageDirectory();
StatFs stat = new StatFs(path.getPath());
long blockSize = stat.getBlockSize();
long availableBlocks = stat.getAvailableBlocks();
return availableBlocks * blockSize;
} else {
return ERROR;
}
}

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

//推断SD卡下external_sd目录的总大小
public static long getTotalExternal_SDMemorySize() {
if (isSDCardExist()) {
File path = Environment.getExternalStorageDirectory();
File externalSD = new File(path.getPath() + "/external_sd");
if (externalSD.exists() && externalSD.isDirectory()) {
StatFs stat = new StatFs(path.getPath() + "/external_sd");
long blockSize = stat.getBlockSize();
long totalBlocks = stat.getBlockCount();
if (getTotalExternalMemorySize() != -1
&& getTotalExternalMemorySize() != totalBlocks
* blockSize) {
return totalBlocks * blockSize;
} else {
return ERROR;
}
} else {
return ERROR;
}

} else {
return ERROR;
}
}

//推断SD卡下external_sd目录的可用大小
public static long getAvailableExternal_SDMemorySize() {
if (isSDCardExist()) {
File path = Environment.getExternalStorageDirectory();
File externalSD = new File(path.getPath() + "/external_sd");
if (externalSD.exists() && externalSD.isDirectory()) {
StatFs stat = new StatFs(path.getPath() + "/external_sd");
long blockSize = stat.getBlockSize();
long availableBlocks = stat.getAvailableBlocks();
if (getAvailableExternalMemorySize() != -1
&& getAvailableExternalMemorySize() != availableBlocks
* blockSize) {
return availableBlocks * blockSize;
} else {
return ERROR;
}

} else {
return ERROR;
}

} else {
return ERROR;
}
}
}