1 package com.example.simpleperf.simpleperfexamplepurejava; 2 3 import android.support.v7.app.AppCompatActivity; 4 import android.os.Bundle; 5 6 public class SleepActivity extends AppCompatActivity { 7 8 @Override 9 protected void onCreate(Bundle savedInstanceState) { 10 super.onCreate(savedInstanceState); 11 setContentView(R.layout.activity_sleep); 12 createRunSleepThread(); 13 } 14 15 void createRunSleepThread() { 16 new Thread(new Runnable() { 17 volatile int counter = 0; 18 long totalRunTimeInNs = 0; 19 long totalSleepTimeInNs = 0; 20 21 private long RunFunction() { 22 long startTimeInNs = System.nanoTime(); 23 for (int i = 0; i < 10000000; ++i) { 24 counter = callFunction(counter); 25 } 26 return System.nanoTime() - startTimeInNs; 27 } 28 29 private long SleepFunction(long sleepTimeInNs) { 30 long startTimeInNs = System.nanoTime(); 31 try { 32 Thread.sleep(sleepTimeInNs / 1000000, (int) (sleepTimeInNs % 1000000)); 33 } catch (Exception e) { 34 } 35 return System.nanoTime() - startTimeInNs; 36 } 37 38 @Override 39 public void run() { 40 while (true) { 41 totalRunTimeInNs += RunFunction(); 42 if (totalSleepTimeInNs < totalRunTimeInNs) { 43 totalSleepTimeInNs += SleepFunction( 44 totalRunTimeInNs - totalSleepTimeInNs); 45 } 46 } 47 } 48 49 private int callFunction(int a) { 50 return a+1; 51 } 52 }, "RunSleepThread").start(); 53 } 54 55 } 56
