android性能1-内存、CPU获取

内存

通过读取文件”/proc/meminfo”的信息能够获取手机Memory的总量，而通过ActivityManager.getMemoryInfo(ActivityManager.MemoryInfo)方法可以获取当前的可用Memory量。

获取总内存，剩余内存，pid内存

public long getTotalMemory() {
String memInfoPath = "/proc/meminfo";
String readTemp = "";
String memTotal = "";
long memory = 0;
try {
FileReader fr = new FileReader(memInfoPath);
BufferedReader localBufferedReader = new BufferedReader(fr, 8192);
while ((readTemp = localBufferedReader.readLine()) != null) {
if (readTemp.contains("MemTotal")) {
String[] total = readTemp.split(":");
memTotal = total[1].trim();
}
}
localBufferedReader.close();
String[] memKb = memTotal.split(" ");
memTotal = memKb[0].trim();
Log.d(LOG_TAG, "memTotal: " + memTotal);
memory = Long.parseLong(memTotal);
} catch (IOException e) {
Log.e(LOG_TAG, "IOException: " + e.getMessage());
}
return memory;
}
public long getFreeMemorySize(Context context) {
ActivityManager.MemoryInfo outInfo = new ActivityManager.MemoryInfo();
ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
am.getMemoryInfo(outInfo);
long avaliMem = outInfo.availMem;
return avaliMem / 1024;
}
public int getPidMemorySize(int pid, Context context) {
ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
int[] myMempid = new int[] { pid };
Debug.MemoryInfo[] memoryInfo = am.getProcessMemoryInfo(myMempid);
memoryInfo[0].getTotalSharedDirty();
int memSize = memoryInfo[0].getTotalPss();
return memSize;
}

CPU

同样的，通过通过读取文件”/proc/cpuinfo”和”/proc/pid/stat”的信息能够获取手机Cpu的总量,pid应用占用率

获取总cpu和pid应用cpu

public void readCpu(int pid) {
String processPid = Integer.toString(pid);
String cpuStatPath = "/proc/" + processPid + "/stat";
try {
// monitor cpu stat of certain process
RandomAccessFile processCpuInfo = new RandomAccessFile(cpuStatPath , "r");
String line = "";
StringBuffer stringBuffer = new StringBuffer();
stringBuffer.setLength(0);
while ((line = processCpuInfo.readLine()) != null) {
stringBuffer.append(line + "\n");
}
String[] tok = stringBuffer.toString().split(" ");
processCpu = Long.parseLong(tok[13]) + Long.parseLong(tok[14]);
processCpuInfo.close();
} catch (FileNotFoundException e) {
Log.w(LOG_TAG, "FileNotFoundException: " + e.getMessage());
} catch (IOException e) {
e.printStackTrace();
}
try {
// monitor total and idle cpu stat of certain process
RandomAccessFile cpuInfo = new RandomAccessFile("/proc/cpuinfo", "r");
String line = "";
while ((null != (line = cpuInfo.readLine())) && line.startsWith("cpu")) {
String[] toks = line.split("\\s+");
idleCpu.add(Long.parseLong(toks[4]));
totalCpu.add(Long.parseLong(toks[1]) + Long.parseLong(toks[2]) + Long.parseLong(toks[3]) + Long.parseLong(toks[4])
+ Long.parseLong(toks[6]) + Long.parseLong(toks[5]) + Long.parseLong(toks[7]));
}
cpuInfo.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}