获取手机内存\可用内存\单个APP运行内存

/** 手机总内存 */
private String getTotalMemory() {
// 系统内存信息文件
String str1 = "/proc/meminfo";
String str2;
String[] arrayOfString;
long initial_memory = 0;

try {
FileReader localFileReader = new FileReader(str1);
BufferedReader localBufferedReader = new BufferedReader(
localFileReader, 8192);
// 读取meminfo第一行，系统总内存大小
str2 = localBufferedReader.readLine();

arrayOfString = str2.split("\\s+");
for (String num : arrayOfString) {
Log.i(str2, num + "\t");
}
// 获得系统总内存，单位是KB，乘以1024转换为Byte
initial_memory = Integer.valueOf(arrayOfString[1]).intValue() * 1024;
localBufferedReader.close();
} catch (IOException e) {
}
// Byte转换为KB或者MB，内存大小规格化
return Formatter.formatFileSize(getBaseContext(), initial_memory);
}

 /** 获取android当前可用内存大小 */
private String getAvailMemory() {
ActivityManager am = (ActivityManager) getSystemService(
Context.ACTIVITY_SERVICE);
MemoryInfo mi = new MemoryInfo();
am.getMemoryInfo(mi);
// mi.availMem; 当前系统的可用内存
// 将获取的内存大小规格化
return Formatter.formatFileSize(getBaseContext(), mi.availMem);
}

1 /** Android获取应用所占内存大小 */
2 private void getRunningAppProcessInfo() {
ActivityManager mActivityManager = (ActivityManager) getSystemService(
Context.ACTIVITY_SERVICE);

// 获得系统里正在运行的所有进程
List<RunningAppProcessInfo> runningAppProcessesList = mActivityManager
.getRunningAppProcesses();

for (RunningAppProcessInfo runningAppProcessInfo : runningAppProcessesList) {
// 进程ID号
int pid = runningAppProcessInfo.pid;
// 用户ID
int uid = runningAppProcessInfo.uid;
// 进程名
String processName = runningAppProcessInfo.processName;
// 占用的内存
int[] pids = new int[] { pid };
Debug.MemoryInfo[] memoryInfo = mActivityManager
.getProcessMemoryInfo(pids);
int memorySize = memoryInfo[0].dalvikPrivateDirty;

Log.i(TAG, "processName=" + processName + ",pid=" + pid + ",uid="
+ uid + ",memorySize=" + memorySize + "kb");
}
}

 /**
* 获取单个 app 内存限制大小
* 返回以 M 为单位的数字，
* 可能在不同的平台或者设备上值都不太一样
*/
private void test01() {
ActivityManager activityManager2 = (ActivityManager) getSystemService(
Context.ACTIVITY_SERVICE);
activityManager2.getMemoryClass();
}