Android 开发获取手机运行内存工具类

2019独角兽企业重金招聘Python工程师标准>>>

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 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;
        }
    }
}

转载于:https://my.oschina.net/zaizaiangels/blog/530547