本文实例讲述了Android编程实现获取系统内存、CPU使用率及状态栏高度的方法。分享给大家供大家参考，具体如下：
DeviceInfoManage类用于获取系统的内存,CPU的信息，以及状态栏的高度
import java.io.BufferedReader; import java.io.FileInputStream; import java.io.FileReader; import java.io.IOException; import java.io.InputStreamReader; import java.lang.reflect.Field; import java.util.List; import android.app.ActivityManager; import android.app.ActivityManager.RunningTaskInfo; import android.content.Context; public class DeviceInfoManager { // private static final String TAG = "DeviceInfoManager"; private static ActivityManager mActivityManager; public synchronized static ActivityManager getActivityManager(Context context) { if (mActivityManager == null) { mActivityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE); } return mActivityManager; } /** * 用于获取状态栏的高度。 * * @return 返回状态栏高度的像素值。 */ public static int getStatusBarHeight(Context context) { int statusBarHeight = 0; try { Class<?> c = Class.forName("com.android.internal.R$dimen"); Object o = c.newInstance(); Field field = c.getField("status_bar_height"); int x = (Integer) field.get(o); statusBarHeight = context.getResources().getDimensionPixelSize(x); } catch (Exception e) { e.printStackTrace(); } return statusBarHeight; } /** * 计算已使用内存的百分比，并返回。 * * @param context * 可传入应用程序上下文。 * @return 已使用内存的百分比，以字符串形式返回。 */ public static String getUsedPercentValue(Context context) { long totalMemorySize = getTotalMemory(); long availableSize = getAvailableMemory(context) / 1024; int percent = (int) ((totalMemorySize - availableSize) / (float) totalMemorySize * 100); return percent + "%"; } /** * 获取当前可用内存，返回数据以字节为单位。 * * @param context 可传入应用程序上下文。 * @return 当前可用内存。 */ public static long getAvailableMemory(Context context) { ActivityManager.MemoryInfo mi = new ActivityManager.MemoryInfo(); getActivityManager(context).getMemoryInfo(mi); return mi.availMem; } /** * 获取系统总内存,返回字节单位为KB * @return 系统总内存 */ public static long getTotalMemory() { long totalMemorySize = 0; String dir = "/proc/meminfo"; try { FileReader fr = new FileReader(dir); BufferedReader br = new BufferedReader(fr, 2048); String memoryLine = br.readLine(); String subMemoryLine = memoryLine.substring(memoryLine.indexOf("MemTotal:")); br.close(); //将非数字的字符替换为空 totalMemorySize = Integer.parseInt(subMemoryLine.replaceAll("\\D+", "")); } catch (IOException e) { e.printStackTrace(); } return totalMemorySize; } /** * 获取顶层activity的包名 * @param context * @return activity的包名 */ public static String getTopActivityPackageName(Context context) { ActivityManager activityManager = getActivityManager(context); List<RunningTaskInfo> runningTasks = activityManager.getRunningTasks(1); return runningTasks.get(0).topActivity.getPackageName(); } /** * 获取当前进程的CPU使用率 * @return CPU的使用率 */ public static float getCurProcessCpuRate() { float totalCpuTime1 = getTotalCpuTime(); float processCpuTime1 = getAppCpuTime(); try { Thread.sleep(360); } catch (Exception e) { } float totalCpuTime2 = getTotalCpuTime(); float processCpuTime2 = getAppCpuTime(); float cpuRate = 100 * (processCpuTime2 - processCpuTime1) / (totalCpuTime2 - totalCpuTime1); return cpuRate; } /** * 获取总的CPU使用率 * @return CPU使用率 */ public static float getTotalCpuRate() { float totalCpuTime1 = getTotalCpuTime(); float totalUsedCpuTime1 = totalCpuTime1 - sStatus.idletime; try { Thread.sleep(360); } catch (InterruptedException e) { e.printStackTrace(); } float totalCpuTime2 = getTotalCpuTime(); float totalUsedCpuTime2 = totalCpuTime2 - sStatus.idletime; float cpuRate = 100 * (totalUsedCpuTime2 - totalUsedCpuTime1) / (totalCpuTime2 - totalCpuTime1); return cpuRate; } /** * 获取系统总CPU使用时间 * @return 系统CPU总的使用时间 */ public static long getTotalCpuTime() { String[] cpuInfos = null; try { BufferedReader reader = new BufferedReader(new InputStreamReader( new FileInputStream("/proc/stat")), 1000); String load = reader.readLine(); reader.close(); cpuInfos = load.split(" "); } catch (IOException ex) { ex.printStackTrace(); } // long totalCpu = Long.parseLong(cpuInfos[2]) // + Long.parseLong(cpuInfos[3]) + Long.parseLong(cpuInfos[4]) // + Long.parseLong(cpuInfos[6]) + Long.parseLong(cpuInfos[5]) // + Long.parseLong(cpuInfos[7]) + Long.parseLong(cpuInfos[8]); sStatus.usertime = Long.parseLong(cpuInfos[2]); sStatus.nicetime = Long.parseLong(cpuInfos[3]); sStatus.systemtime = Long.parseLong(cpuInfos[4]); sStatus.idletime = Long.parseLong(cpuInfos[5]); sStatus.iowaittime = Long.parseLong(cpuInfos[6]); sStatus.irqtime = Long.parseLong(cpuInfos[7]); sStatus.softirqtime = Long.parseLong(cpuInfos[8]); return sStatus.getTotalTime(); } /** * 获取当前进程的CPU使用时间 * @return 当前进程的CPU使用时间 */ public static long getAppCpuTime() { // 获取应用占用的CPU时间 String[] cpuInfos = null; try { int pid = android.os.Process.myPid(); BufferedReader reader = new BufferedReader(new InputStreamReader( new FileInputStream("/proc/" + pid + "/stat")), 1000); String load = reader.readLine(); reader.close(); cpuInfos = load.split(" "); } catch (IOException ex) { ex.printStackTrace(); } long appCpuTime = Long.parseLong(cpuInfos[13]) + Long.parseLong(cpuInfos[14]) + Long.parseLong(cpuInfos[15]) + Long.parseLong(cpuInfos[16]); return appCpuTime; } static Status sStatus = new Status(); static class Status { public long usertime; public long nicetime; public long systemtime; public long idletime; public long iowaittime; public long irqtime; public long softirqtime; public long getTotalTime() { return (usertime + nicetime + systemtime + idletime + iowaittime + irqtime + softirqtime); } } }
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希望本文所述对大家Android程序设计有所帮助。