我想获得Android上的整体CPU使用率,类似于Windows的任务管理器。我可以解析Android中包含的top
程序的输出,但是如果有一个API调用做同样的事情,那就更好了。
任何指针?
答案 0 :(得分:25)
注意:由于增强的安全机制,这个答案已经过时了,不可以在较新版本的Android上运行。
对于完整的CPU使用情况(不适用于每个进程),您可以使用:
/**
*
* @return integer Array with 4 elements: user, system, idle and other cpu
* usage in percentage.
*/
private int[] getCpuUsageStatistic() {
String tempString = executeTop();
tempString = tempString.replaceAll(",", "");
tempString = tempString.replaceAll("User", "");
tempString = tempString.replaceAll("System", "");
tempString = tempString.replaceAll("IOW", "");
tempString = tempString.replaceAll("IRQ", "");
tempString = tempString.replaceAll("%", "");
for (int i = 0; i < 10; i++) {
tempString = tempString.replaceAll(" ", " ");
}
tempString = tempString.trim();
String[] myString = tempString.split(" ");
int[] cpuUsageAsInt = new int[myString.length];
for (int i = 0; i < myString.length; i++) {
myString[i] = myString[i].trim();
cpuUsageAsInt[i] = Integer.parseInt(myString[i]);
}
return cpuUsageAsInt;
}
private String executeTop() {
java.lang.Process p = null;
BufferedReader in = null;
String returnString = null;
try {
p = Runtime.getRuntime().exec("top -n 1");
in = new BufferedReader(new InputStreamReader(p.getInputStream()));
while (returnString == null || returnString.contentEquals("")) {
returnString = in.readLine();
}
} catch (IOException e) {
Log.e("executeTop", "error in getting first line of top");
e.printStackTrace();
} finally {
try {
in.close();
p.destroy();
} catch (IOException e) {
Log.e("executeTop",
"error in closing and destroying top process");
e.printStackTrace();
}
}
return returnString;
}
玩得开心:)
答案 1 :(得分:2)
您可以参考“DevTools”项目。
使用ActivityManager可以获得大量信息,例如ActivityManager.RunningAppProcessInfo,ActivityManager.RunningTaskInfo,...
但我不确定结果会与'top'命令相同。
答案 2 :(得分:0)
您可以阅读/proc/stat
并分析文件内容。第一行是这样的:
cpu 79242 0 74306 842486413 756859 6140 67701 0
列的含义如下,从左到右:
- 1st column : user = normal processes executing in user mode
- 2nd column : nice = niced processes executing in user mode
- 3rd column : system = processes executing in kernel mode
- 4th column : idle = twiddling thumbs
- 5th column : iowait = waiting for I/O to complete
- 6th column : irq = servicing interrupts
- 7th column : softirq = servicing softirqs
平均闲置百分比:
X % = ( idle * 100 ) / ( user + nice + system + idle + iowait + irq + softirq )
您可以计算时间增量与数字CPU使用率之间的空闲差异。