no route to host Chromium网页输入事件捕捉和手势检测过程分析(3)

这个函数定义在文件external/chromium_org/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java中。

ContentViewCore类的成员函数onTouchEvent主要是调用另外一个成员函数nativeOnTouchEvent处理参数event描写叙述的Touch事件。

ContentViewCore类的成员函数nativeOnTouchEvent是一个JNI函数，它由C++层的函数Java_com_android_org_chromium_content_browser_ContentViewCore_nativeOnTouchEvent实现。例如以下所看到的：

__attribute__((visibility("default")))
jboolean
    Java_com_android_org_chromium_content_browser_ContentViewCore_nativeOnTouchEvent(JNIEnv*
    env,
    jobject jcaller,
    jlong nativeContentViewCoreImpl,
    jobject event,
    jlong timeMs,
    jint action,
    jint pointerCount,
    jint historySize,
    jint actionIndex,
    jfloat x0,
    jfloat y0,
    jfloat x1,
    jfloat y1,
    jint pointerId0,
    jint pointerId1,
    jfloat touchMajor0,
    jfloat touchMajor1,
    jfloat rawX,
    jfloat rawY,
    jint androidToolType0,
    jint androidToolType1,
    jint androidButtonState) {
  ContentViewCoreImpl* native =
      reinterpret_cast<ContentViewCoreImpl*>(nativeContentViewCoreImpl);
  CHECK_NATIVE_PTR(env, jcaller, native, "OnTouchEvent", false);
  return native->OnTouchEvent(env, jcaller, event, timeMs, action, pointerCount,
      historySize, actionIndex, x0, y0, x1, y1, pointerId0, pointerId1,
      touchMajor0, touchMajor1, rawX, rawY, androidToolType0, androidToolType1,
      androidButtonState);
}

这个函数定义在文件out/target/product/generic/obj/GYP/shared_intermediates/content/jni/ContentViewCore_jni.h中。

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