Android 处理程序的 FIND_POTENTIAL_LEAKS

Question

在Handler.java的源代码中，我划过下面的代码段

public Handler(Callback callback, boolean async) {
    if (FIND_POTENTIAL_LEAKS) {
        final Class<? extends Handler> klass = getClass();
        if ((klass.isAnonymousClass() || klass.isMemberClass() || klass.isLocalClass()) &&
                (klass.getModifiers() & Modifier.STATIC) == 0) {
            Log.w(TAG, "The following Handler class should be static or leaks might occur: " +
                klass.getCanonicalName());
        }
    }

}

从代码中，我可以看到 FIND_POTENTIAL_LEAKS 用于查找潜在 leaks.However 字段是 private 并且总是 false。

那么什么时候才能真正用上呢？

编辑

来自 Murat，反射似乎有效，但为什么 Android 设置默认值 true？

Answer 1

该字段的文档中有评论：

 public class Handler {
65     /*
66      * Set this flag to true to detect anonymous, local or member classes
67      * that extend this Handler class and that are not static. These kind
68      * of classes can potentially create leaks.
69      */
70     private static final boolean FIND_POTENTIAL_LEAKS = false;

我猜它会通过反射设置为 true，例如此处描述 Change private static final field using Java reflection

Android 处理程序的 FIND_POTENTIAL_LEAKS

Android Handler's FIND_POTENTIAL_LEAKS

android

android-handler

编辑