應用啟動#
安卓官方文檔：
應用啟動時間 | App quality | Android Developers (google.cn)
啟動時間統計#
1. 使用 perfetto#
2 使用命令#
>adb shell am start -S -W com.xiaopeng.musicradio/com.xiaopeng.musicradio.home.view.HomeActivity
Stopping: com.xiaopeng.musicradio
Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=com.xiaopeng.musicradio/.home.view.HomeActivity }
Status: ok
LaunchState: COLD
Activity: com.xiaopeng.musicradio/.home.view.HomeActivity
TotalTime: 2602
WaitTime: 2609
Complete
C:\Users\Xpeng>adb shell am start -S -W com.xiaopeng.musicradio/com.xiaopeng.musicradio.home.view.HomeActivity
Stopping: com.xiaopeng.musicradio
Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=com.xiaopeng.musicradio/.home.view.HomeActivity }
Status: ok
LaunchState: COLD
Activity: com.xiaopeng.musicradio/.home.view.HomeActivity
TotalTime: 2642
WaitTime: 2657
Complete
adb shell am start -S -W com.xiaopeng.musicradio/com.xiaopeng.musicradio.home.view.HomeActivity
Stopping: com.xiaopeng.musicradio
Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=com.xiaopeng.musicradio/.home.view.HomeActivity }
Status: ok
LaunchState: COLD
Activity: com.xiaopeng.musicradio/.home.view.HomeActivity
TotalTime: 2634
WaitTime: 2649
Complete
package com.xiaopeng.utils;
import android.os.Debug;
import android.text.TextUtils;
/**
* 正式環境中禁止使用這個類
*/
public class TraceMethodUtils {
/**
* 適合於非常精確的記錄，某個具體函數的耗時分析
*
* profiler cpu 中instrument模式，會從開始一直記錄方法/cpu 使用情況，對性能影響大。
*/
@Deprecated
public static void startTrack(String tracFileName){
Debug.startMethodTracing(fixTraceFileName(tracFileName));
}
/**
* 在android 5.0 以後使用，間隔時間微妙
*
* profiler cpu 中sample模式，系統間隔us 週期性記錄調用棧，對性能影響小
* @param tracFileName
*/
@Deprecated
public static void startSampleTrack(String tracFileName){
//1000us=1ms 週期性記錄一次
Debug.startMethodTracingSampling(fixTraceFileName(tracFileName),50,1000);
}
@Deprecated
private static String fixTraceFileName(String tracFileName){
if (!TextUtils.isEmpty(tracFileName)){
tracFileName=tracFileName.endsWith(".trace")?tracFileName:tracFileName+".trace";
tracFileName=new StringBuilder().append(System.currentTimeMillis()).append("_").append(tracFileName).toString();
}else{
tracFileName=new StringBuilder().append(System.currentTimeMillis()).append(".trace").toString();
}
return tracFileName;
}
/**
* 結束跟蹤
*/
@Deprecated
public static void stopTrack(){
Debug.stopMethodTracing();
}
}