Question

我从JavaActivity调用NativeActivity。我的NativeActivity的入口点是

 android_main(struct android_app* state)

最后，我打电话给

 ANativeActivity_finish

但是我的本机活动只是挂起，而不是返回调用它的Java Activity（它只是使用startActivity调用）。好像它处于暂停状态。我可以让它返回到上一个活动的唯一方法是在我的android_main末尾调用exit(0)，但是这会导致进程失败并导致其他问题。

如何成功退出NativeActivity并返回调用它的JavaActivity？

Answer 1

我遇到了同样的问题。基本上，当在主循环中调用ANativeActivity_finish（..）时，它对我有用，因为它在静态无效android_app_destroy（struct）中调用ANativeActivity_finish（..）后，通过将state-＆gt; destroyRequested设置为1来使状态无效并完成应用程序本身android_app * android_app）（android_native_app_glue.c C：173）。

void android_main(struct android_app* state) 
{
  // Attach current state if needed
  state->activity->vm->AttachCurrentThread(&state->activity->env, NULL);
  ...
  // our main loop for the app. Will only return once the game is really finished.
  while (true) {
    ...
    while ((ident=ALooper_pollAll(engine.animating ? 0 : -1, NULL, &events,(void**)&source)) >= 0) {
      ...
      // Check if we are exiting. Which is the case once we called ANativeActivity_finish(state->activity);
      if (state->destroyRequested != 0) 
      {
         // Quit our app stuff herehere
         // detatch from current thread (if we have attached in the beginning)
         state->activity->vm->DetachCurrentThread();
         // return the main, so we get back to our java activity which calle the nativeactivity
         return;
      }
    }
    if (engine.animating) 
    {
      // animation stuff here
    }
    // if our app told us to finish
    if(Closed)
    {
      ANativeActivity_finish(state->activity);
    }
  }
}

我觉得现在为时已晚，但我花了很多时间在上面，因为我找不到闷热，所以我在这里发布给遇到同样问题的每个人。有关分离和附加调用的其他棘手内容的更多信息，请访问：Access Android APK Asset data directly in c++ without Asset Manager and copying

Answer 2

最终有效的解决方案是从app（本机端）完成（a）NativeActivity的子类是在UI线程上运行finish()的java方法。

C / C ++方：

...

jmethodID FinishHim = jni->GetMethodID(activityClass, "FinishMe", "()V");
jni->CallVoidMethod(state->activity->clazz, FinishHim);

Java方面：

public class CustomNativeActivity extends NativeActivity {

    ...

    public void FinishMe() {
        this.runOnUiThread(new Runnable() {
            public void run() {
                finish();
            }
        });
    }
}

NativeActivity没有完成

2 个答案: