小编use*_*516的帖子

我创建了一个简单的CollapsingToolbarLayout,它就像一个魅力.我的问题是,如果我尝试在nestedscrollview上使用一个滚动滚动,它会在我释放手指时停止.正常滚动就像它应该的那样工作.

我的活动代码未更改=>自动生成的空活动.(我刚刚点击了在android studio中创建新的空活动并编辑了XML).

我在这里看到,imageview本身的滚动手势是错误的,但不是,滚动本身是错误的:看到这里.

我尝试通过java代码激活"平滑滚动".似乎如果我滚动得足够远以至于不再可见图像视图,则可以识别出手势.

TLDR:只要图像视图可见,为什么抛弃手势不起作用？我的XML代码如下所示:

    <android.support.design.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/profile_app_bar_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
        android:fitsSystemWindows="true">

        <android.support.design.widget.CollapsingToolbarLayout
            android:id="@+id/profile_collapsing_toolbar_layout"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:layout_scrollFlags="scroll|exitUntilCollapsed"
            app:contentScrim="?attr/colorPrimary"
            app:expandedTitleMarginStart="48dp"
            app:expandedTitleMarginEnd="64dp"
            android:fitsSystemWindows="true">

            <ImageView
                android:id="@+id/image"
                android:layout_width="match_parent"
                android:layout_height="420dp"
                android:scaleType="centerCrop"
                android:fitsSystemWindows="true"
                android:src="@drawable/headerbg"
                android:maxHeight="192dp"

                app:layout_collapseMode="parallax"/>

            <android.support.v7.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
                app:layout_collapseMode="pin" />

        </android.support.design.widget.CollapsingToolbarLayout>

    </android.support.design.widget.AppBarLayout>

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/fab"
        app:layout_anchor="@id/profile_app_bar_layout"
        app:layout_anchorGravity="bottom|right|end"
        android:layout_height="@dimen/fab_size_normal"
        android:layout_width="@dimen/fab_size_normal"
        app:elevation="2dp"
        app:pressedTranslationZ="12dp"
        android:layout_marginRight="8dp"
        android:layout_marginEnd="8dp"/>

    <android.support.v4.widget.NestedScrollView
        android:id="@+id/profile_content_scroll"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:clipToPadding="false"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
        android:layout_gravity="fill_vertical"
        android:minHeight="192dp"
        android:overScrollMode="ifContentScrolls"
        > …

我尝试像这样设置我的着色器:

fog = new ShaderProgram(Gdx.files.local("shader/shad.vert"), Gdx.files.local("shader/shad.frag"));

但它给了我这个例外:

Exception in thread "LWJGL Application" com.badlogic.gdx.utils.GdxRuntimeException: java.lang.NullPointerException
    at com.badlogic.gdx.backends.lwjgl.LwjglApplication$1.run(LwjglApplication.java:113)
Caused by: java.lang.NullPointerException
    at com.badlogic.gdx.graphics.glutils.ShaderProgram.loadShader(ShaderProgram.java:194)
    at com.badlogic.gdx.graphics.glutils.ShaderProgram.compileShaders(ShaderProgram.java:173)
    at com.badlogic.gdx.graphics.glutils.ShaderProgram.<init>(ShaderProgram.java:156)
    at com.badlogic.gdx.graphics.glutils.ShaderProgram.<init>(ShaderProgram.java:165)
    at Comet.Avoider.CometAvoider.create(CometAvoider.java:73)
    at com.badlogic.gdx.backends.lwjgl.LwjglApplication.mainLoop(LwjglApplication.java:127)
    at com.badlogic.gdx.backends.lwjgl.LwjglApplication$1.run(LwjglApplication.java:110)

我的着色器是这些:

attribute vec4 a_position;
attribute vec4 a_color;
attribute vec2 a_texCoord0;
uniform mat4 u_projTrans;
varying vec4 v_color;
varying vec2 v_texCoords;
void main() {
    v_color = a_color;
    v_texCoords = a_texCoord0;
    gl_Position = u_projTrans * a_position;
}

和

#ifdef GL_ES
precision mediump float;
#endif
varying vec4 v_color;
varying vec2 v_texCoords; …