Android(安卓)开发获取手机运行内存工具类

package com.zaizai.safty.utils;import android.app.ActivityManager;import android.content.Context;import android.content.pm.PackageManager;import java.io.BufferedReader;import java.io.File;import java.io.FileInputStream;import java.io.InputStreamReader;import java.util.List;/** * Created by zaizai on 2015/11/15. */public class SystemInfoUtils {    /**     * 获取正在运行的进程的数量     *     * @param context 上下文     * @return the running process count in devices     */    public static int getRunningProcessCount(Context context) {        /*PackageManager 包管理器，相当于程序管理器，静态的内容*/        /*ActivityManager 进程管理器。管理手机活动的信息*/        ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);        List<ActivityManager.RunningAppProcessInfo> appProcessInfos = activityManager.getRunningAppProcesses();        return appProcessInfos.size();    }    /**     * 获取手机可用可用内存数量     *     * @param context     * @return     */    public static long getAvailableRemainsMemoryCount(Context context) {        ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);        ActivityManager.MemoryInfo memoryInfo = new ActivityManager.MemoryInfo();        activityManager.getMemoryInfo(memoryInfo);        return memoryInfo.availMem;    }    /**     * 获取手机可用总内存数量     *     * @param context     * @return     */    public static long getTotalRemainsMemoryCount(Context context) {        /*只能在4.0以上运行*/       /* ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);        ActivityManager.MemoryInfo memoryInfo = new ActivityManager.MemoryInfo();        activityManager.getMemoryInfo(memoryInfo);        return memoryInfo.totalMem;*/

使用下面代码可兼容低版本        try{            File file = new File("/proc/meminfo");            FileInputStream fis = new FileInputStream(file);            BufferedReader br = new BufferedReader(new InputStreamReader(fis));            String line = br.readLine();            StringBuffer sb = new StringBuffer();            for (char c : line.toCharArray()) {                if(c >= '0' && c <= '9'){                    sb.append(c);                }            }            return Integer.parseInt(sb.toString())*1024l;        }catch(Exception e){            e.printStackTrace();            return 0;        }    }}

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