計時器加載其他活動需要多長時間

Question

我想和你一樣。你知道我怎麼可以時間需要多長時間來加載另一個活動

例如：

活動A

onCreate.... 
     Intent myIntent = new Intent(this, ActivityB.class); 
     finish(); 
     //START THE TIMER HERE ************** 
     startActivity(myIntent); 
... 

活動B

onCrate..... 

loadPlayer(); 
.... 


private void loadPlayer() { 

//Player has been loaded 
//STOP THE TIME AND PRINT TO LOG CAT *************** 
log.i("Timer", "It taken = "); 

} 

Answer 1

我創建了一個小幫手類，適合我的需求在幾個簡單的應用程序：

public class Profiler { 

    private static HashMap<String, Long> profileTimes; 

    public static void startProfiling(String key) { 
     profileTimes.put(key, System.currentTimeMillis()); 
    } 

    public static void endProfiling(String key) { 
     endProfiling(key, ""); 
    } 

    public static void endProfiling(String key, String desc) { 
     if (profileTimes.get(key) != null) { 
      long time = System.currentTimeMillis() - profileTimes.get(key); 
      Log.d("profiling", key + ", " + desc + ": time: " + (time/1000) + "." + String.format("%03d", (time % 1000))); 
      profileTimes.remove(key); 
     } else { 
      Log.e("profiling", "NO profiling found for key: " + key); 
     } 
    } 
} 

要使用它只是做Profiler.startProfiling("ActivityB")，當你考慮它的加載 - >Profiler.endProfiling("ActivityB")

Answer 2

你必須採取兩個全局變量。

假設...

public static long TIME1, TIME2; 

活動A

onCreate.... 
     Intent myIntent = new Intent(this, ActivityB.class); 
     finish(); 
     //START THE TIMER HERE ************** 

     TIME1 = System.currentTimeMillis(); 

     startActivity(myIntent); 
... 

活動B

private void loadPlayer() { 

    //Player has been loaded 
    //STOP THE TIME AND PRINT TO LOG CAT *************** 

    TIME2 = System.currentTimeMillis(); 

    log.i("Timer", "It taken = " + (TIME2 - TIME1)); 


    }