优化——定位耗时方法

定位耗时方法

logcat查看

logcat中在启动应用的时候有Displayed 可以查看启动时间

01-08 14:04:44.619: I/ActivityManager(1459): Displayed org.codeaurora.snapcam/com.android.camera.CameraLauncher: +1s56ms

直接使用adb查看

adb shell am start -W com.example.myapplication/com.example.Dialog.DialogActivity
Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=com.example.myapplication/com.example.Dialog.DialogActivity }
Status: ok
Activity: com.example.myapplication/com.example.Dialog.DialogActivity
ThisTime: 1513          最后一个activity启动的时间
TotalTime: 1513         一系列activity启动的时间
WaitTime: 1768          总启动时间，包括加载app信息到内存的时间
Complete

Debug.startMethodTracing

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    File file = new File(Environment.getExternalStorageDirectory(), "app.trace");
    Debug.startMethodTracing(file.getAbsolutePath());
    init();
    test();
    Debug.stopMethodTracing();
}

private void test() {
    try {
        Thread.sleep(200);
    } catch (InterruptedException e) {
        e.printStackTrace();
    }
}

private void init() {
    test1();
}

private void test1() {
    try {
        Thread.sleep(1000);
    } catch (InterruptedException e) {
        e.printStackTrace();
    }
    test2();
    test();
}

private void test2() {
    try {
        Thread.sleep(2000);
    } catch (InterruptedException e) {
        e.printStackTrace();
    }
}

启动这个activity之后，把app.trace拉出来，然后直接把文件拖到AndroidStudio中查看

adb pull /storage/emulated/0/app.trace

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