Unity接入安卓sdk查看应用内存占用

注：若不清楚如何在unity中接入android sdk可先了解下相关流程。项目地址：http://download.csdn.net/download/yhuangher/9976564

在项目后期进行内存优化，在android端进行内存优化时做了若干辅助工具，比如此款，查看系统总内存，当前App占用内存，系统剩余内存及fps，如图示：

android端代码如下：

package com.JohnRey.ShowAppBaseInfo;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.List;

import android.annotation.SuppressLint;
import android.app.ActivityManager;
import android.content.Context;
import android.os.Bundle;
import android.os.Debug;
import android.text.format.Formatter;

import com.unity3d.player.UnityPlayerActivity;

public class MainActivity extends UnityPlayerActivity {
     private ActivityManager mActivityManager = null;

    @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         mActivityManager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
     }

    public String getMemoryInfo() {

        // 系统总内存
         String message = getTotalMemory();
         // 系统可用内存
         message += "-" + getAvailMemory();
         // 当前App占用的内存
         message += "-" + getCurrentProcessMemory();
         return message;
     }

    /**
      * 获取当前app占用内存
      * 
      * @return
      */
     @SuppressLint("NewApi")
     private String getCurrentProcessMemory() {
         String pkgName = this.getPackageName();
         List<ActivityManager.RunningAppProcessInfo> appList = mActivityManager
                 .getRunningAppProcesses();
         for (ActivityManager.RunningAppProcessInfo appInfo : appList) {
             if (appInfo.processName.equals(pkgName)) {
                 int[] pidArray = new int[] { appInfo.pid };
                 Debug.MemoryInfo[] memoryInfo = mActivityManager
                         .getProcessMemoryInfo(pidArray);
                 float temp = (float) memoryInfo[0].getTotalPrivateDirty() / 1024.0f;
                 return String.format("%.2f", temp)+"MB";
             }
         }
         return "获取失败";
     }

    /**
      * 获取手机总可用内存大小
      * 
      * @return
      */
     private String getTotalMemory() {
         String str1 = "/proc/meminfo";// 系统内存信息文件
         String str2;
         String[] arrayOfString;

        try {
             FileReader localFileReader = new FileReader(str1);
             BufferedReader localBufferedReader = new BufferedReader(
                     localFileReader, 8192);
             str2 = localBufferedReader.readLine();// 读取meminfo第一行，系统总内存大小

            arrayOfString = str2.split("\s+");
             localBufferedReader.close();
             float temp = Integer.valueOf(arrayOfString[1])/1048576.0f;
             return String.format("%.2f", temp)+"GB";
         } catch (IOException e) {
             return "获取失败";
         }
     }

    /**
      * 获取系统可用内存信息
      * 
      * @return
      */
     private String getAvailMemory() {

        ActivityManager.MemoryInfo mi = new ActivityManager.MemoryInfo();
         mActivityManager.getMemoryInfo(mi);
         // 转化为mb
         return Formatter.formatFileSize(this, mi.availMem);
     }
}

C#端代码如下：

using UnityEngine;
using System.Collections;

public class FPS : MonoBehaviour
{
     public float updateInterval = 0.5F;
     private float accum = 0; 
     private int frames = 0;

    private float timeleft;

    void Start()
     {
         timeleft = updateInterval;
#if UNITY_ANDROID
         _getJavaObject();
         Invoke("callAndroid", 2);
#endif
     }

    void Update()
     {
         _updateFPS();
     }

    #region FPS显示

    private float fps;
     [Range(0, 150)]
     public int MaxFPS;
     private string _curFPS;
     private void _updateFPS()
     {
         timeleft -= Time.deltaTime;
         //timescale是时间速度，为1时即为正常速度，为2时即为两倍速，为0时即为暂停
         accum += Time.timeScale / Time.deltaTime;
         ++frames;

        if (timeleft <= 0.0)
         {
             fps = accum / frames;
             _curFPS = "FPS:" + fps;
             timeleft = updateInterval;
             accum = 0.0F;
             frames = 0;
         }
     }

    #endregion

    #region CallAndroid

    private string _memoryInfo;
     private AndroidJavaObject ajo;
#if UNITY_ANDROID
     private void callAndroid()
     {
         _memoryInfo = string.Empty;
         string result = ajo.Call<string>("getMemoryInfo");
         string[] strArray = result.Split('-');
         //系统总内存
         _memoryInfo += "系统内存:" + strArray[0] + "
";
         //系统可用内存
         _memoryInfo += "可用内存:" + strArray[1] + "
";
         //App占用内存
         _memoryInfo += "app占用内存:" + strArray[2] + "
";
         ////系统分配的最大占用内存
         //_memoryInfo += "AllotMemory:" + strArray[3];

        //加入代码之后，可能会每隔两秒钟出现卡顿现象
         Invoke("callAndroid", 2);
     }

    private void _getJavaObject()
     {
         AndroidJavaClass cls_UnityPlayer = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
         ajo = cls_UnityPlayer.GetStatic<AndroidJavaObject>("currentActivity");
     }
#endif
     #endregion

    void OnGUI()
     {
         GUIStyle style = new GUIStyle();
         style.fontSize = 20;
         style.normal.textColor = Color.green;
         GUI.Label(new Rect(Screen.width - 300, 10, 250, 200), _memoryInfo, style);

        style.normal.textColor = fps > MaxFPS ? Color.red : Color.green;
         GUI.Label(new Rect(Screen.width - 200, Screen.height - 50, 100, 30), _curFPS, style);
     }
}