android.graphics.Point：所有方法都是存根 [英] android.graphics.Point: all methods are stubs

问题描述

我试图使用从 android.graphics Point类，但现在看来，所有的方法都是存根。例如，线

I'm trying to use the Point class from android.graphics, but it appears that all the methods are stubs. For example, the line

Point p = new Point(1, 1);

原因了java.lang.RuntimeException：存根。如果我看字节code的时候，我看到一堆存根方法，例如：

causes java.lang.RuntimeException: Stub!. If I look at the bytecode for Point, I see a bunch of stubbed methods, e.g:

  // Method descriptor #17 (II)V
  // Stack: 3, Locals: 3
  public Point(int x, int y);
     0  aload_0 [this]
     1  invokespecial java.lang.Object() [1]
     4  new java.lang.RuntimeException [2]
     7  dup
     8  ldc <String "Stub!"> [3]
    10  invokespecial java.lang.RuntimeException(java.lang.String) [4]
    13  athrow
      Line numbers:
        [pc: 0, line: 5]
      Local variable table:
        [pc: 0, pc: 14] local: this index: 0 type: android.graphics.Point
        [pc: 0, pc: 14] local: x index: 1 type: int
        [pc: 0, pc: 14] local: y index: 2 type: int

这里有什么交易？当然，他们并没有推出一款类是100％的存根。

What's the deal here? Surely they didn't ship a class that's 100% stubs.

推荐答案

我猜测你在看的android.jar 。这JAR文件主要是存根。真正的实现是在设备上。

I am guessing that you are looking at android.jar. That JAR file is mostly stubs. The real implementation is on the device.

有关一个正确配置的Andr​​oid项目，在模拟器或设备上运行，为 android.graphics.Point 的构造和其他一切将使用真正的实现。你只用的android.jar 作为编译目标，它不应该被包含在最终的APK文件。

For a properly configured Android project, running in an emulator or on a device, the constructor for android.graphics.Point and everything else will use the real implementation. You only use android.jar as a compilation target, and it should not be included in the resulting APK file.

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