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  public void watchActivities() {
    // Make sure you don't get installed twice.
    stopWatchingActivities();
    //注册 Activity 生命周期监听
    application.registerActivityLifecycleCallbacks(lifecycleCallbacks);
  }

  private final Application.ActivityLifecycleCallbacks lifecycleCallbacks =
      new Application.ActivityLifecycleCallbacks() {
        @Override public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
        }

        @Override public void onActivityStarted(Activity activity) {
        }

        @Override public void onActivityResumed(Activity activity) {
        }

        @Override public void onActivityPaused(Activity activity) {
        }

        @Override public void onActivityStopped(Activity activity) {
        }

        @Override public void onActivitySaveInstanceState(Activity activity, Bundle outState) {
        }

        @Override public void onActivityDestroyed(Activity activity) {
          ActivityRefWatcher.this.onActivityDestroyed(activity);
        }
      };

void onActivityDestroyed(Activity activity) {
    refWatcher.watch(activity);
}
public void watch(Object watchedReference) {
    watch(watchedReference, "");
}
public void watch(Object watchedReference, String referenceName) {
    if (this == DISABLED) {
      return;
    }
    checkNotNull(watchedReference, "watchedReference");
    checkNotNull(referenceName, "referenceName");
    final long watchStartNanoTime = System.nanoTime();
    String key = UUID.randomUUID().toString();
    retainedKeys.add(key);
    final KeyedWeakReference reference =
        new KeyedWeakReference(watchedReference, key, referenceName, queue);

    ensureGoneAsync(watchStartNanoTime, reference);
}

// 队列
ReferenceQueue queue = new ReferenceQueue<>();
// KeyedWeakReference 为 LeakCanary 自定义的软引用( 就是简单继承了 WeakReference )
// watchedReference 就是 Activity 
KeyedWeakReference reference = new KeyedWeakReference(watchedReference, queue);