关于Android冷启动耗时优化详解

adb shell am start -W [packageName]/[packageName.MainActivity]

/**
* 统计冷启动各个时间点的耗时
*/
public class StartLogHelper {

    private static final String TAG = "StartLogHelper";
    private static long startTime;

    /**
     * 设置开始时间，暂时放到启动的时间,放到Application的attachBaseContext方法中
     * @param start
     */
    public static void setStart(long start){
        startTime = start;
    }

    /**
     * application初始化的时间，放到Application的onCreate方法最后
     */
    public static void getApplicationTime(){
        long end = System.currentTimeMillis();
        DebugLog.e(TAG,"==================getApplicationTime==" + (end - startTime));

    }

    /**
     * 欢迎页初始化的时间
     */
    public static void getWelcomeTime(){
        long end = System.currentTimeMillis();
        DebugLog.e(TAG,"==================getWelcomeTime==" + (end - startTime));
    }

    /**
     * Main页面初始化的时间
     */

    public static void getMainTime(){
        long end = System.currentTimeMillis();
        DebugLog.e(TAG,"==================getMainTime==" + (end - startTime));
    }

SplashActivity的清单文件设置
   android:theme="@style/SplashScreenTheme”

SplashScreenTheme属性定义
   <style name="SplashScreenTheme" parent="Theme.AppCompat.NoActionBar">
        <item name="android:windowBackground">@drawable/bg_splash</item>
   </style>

bg_splash定义
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@android:color/white" />
        <bitmap
            android:antialias="true"
            android:gravity="center"
            android:src="@drawable/bg_show" />
    </item>
</layer-list>

public class AppConfigHelper {
    public void setAppConfig(Application application){
        addSyncTask(application);
        addAsyncTask(application);
        TaskConfigManager.getInstance().startInit();
    }

    private void addSyncTask(Application application) {
        TaskConfigManager.getInstance().addTask(new ZMLTask("oneLogin") {
            @Override
            public void run() {
                JVerifyHelper.init(application);
            }
        });
    }
}