Get Memory Usage in Android

Question

Is there any API by which we can get CPU or Memory usage of android?

I have tried one code as below:

package com.infostretch.mainactivity;  import java.io.BufferedReader; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStreamReader;  public class CPULoad  {     long total = 0;     long idle = 0;      float usage = 0;      public CPULoad()     {         readUsage();     }      public float getUsage()     {         readUsage();         return usage;     }      private void readUsage()     {         try         {             BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream("/proc/stat")), 1000);             String load = reader.readLine();             reader.close();              String[] toks = load.split(" ");              long currTotal = Long.parseLong(toks[2]) + Long.parseLong(toks[3]) + Long.parseLong(toks[4]);             long currIdle = Long.parseLong(toks[5]);              this.usage = (currTotal - total) * 100.0f / (currTotal - total + currIdle - idle);             this.total = currTotal;             this.idle = currIdle;         }         catch(IOException ex)         {             ex.printStackTrace();         }     } } 

Is this the correct way to do it?

Answer 1

I use this function to calculate cpu usage. Hope it can help you.

private float readUsage() {     try {         RandomAccessFile reader = new RandomAccessFile("/proc/stat", "r");         String load = reader.readLine();          String[] toks = load.split(" +");  // Split on one or more spaces          long idle1 = Long.parseLong(toks[4]);         long cpu1 = Long.parseLong(toks[2]) + Long.parseLong(toks[3]) + Long.parseLong(toks[5])               + Long.parseLong(toks[6]) + Long.parseLong(toks[7]) + Long.parseLong(toks[8]);          try {             Thread.sleep(360);         } catch (Exception e) {}          reader.seek(0);         load = reader.readLine();         reader.close();          toks = load.split(" +");          long idle2 = Long.parseLong(toks[4]);         long cpu2 = Long.parseLong(toks[2]) + Long.parseLong(toks[3]) + Long.parseLong(toks[5])             + Long.parseLong(toks[6]) + Long.parseLong(toks[7]) + Long.parseLong(toks[8]);          return (float)(cpu2 - cpu1) / ((cpu2 + idle2) - (cpu1 + idle1));      } catch (IOException ex) {         ex.printStackTrace();     }      return 0; }