Question

我想要做的是处理滚动NestedScrollView。但是当我＆＃34; setOnScrollChangedListener＆＃34;它，然后滚动视图，没有任何反应，方法＆＃34; setOnScrollChangedListener＆＃34;甚至没有被称为...... 谁能告诉我为什么？什么时候方法＆＃34; setOnScrollChangedListener＆＃34;被称为？

<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/main_content"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true">
    <android.support.design.widget.AppBarLayout
        android:id="@+id/MyAppbar"
        android:layout_width="match_parent"
        android:layout_height="256dp"
        android:fitsSystemWindows="true">
        <android.support.design.widget.CollapsingToolbarLayout
            android:id="@+id/collapse_toolbar"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:layout_scrollFlags="scroll|exitUntilCollapsed"
            android:background="@color/material_deep_teal_500"
            android:fitsSystemWindows="true">

            <ImageView
                android:id="@+id/bgheader"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:scaleType="centerCrop"
                android:fitsSystemWindows="true"
                android:background="@drawable/example"
                app:layout_collapseMode="parallax" />

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

    </android.support.design.widget.AppBarLayout>
    <android.support.v4.widget.NestedScrollView
        android:id="@+id/scroll"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="fill_vertical"
        app:layout_behavior="@string/appbar_scrolling_view_behavior">
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical"
            android:paddingTop="24dp">

            <android.support.v7.widget.CardView
                android:layout_marginLeft="10dp"
                android:layout_marginRight="10dp"
                android:layout_marginTop="10dp"
                android:layout_width="match_parent"
                android:layout_height="wrap_content">

                <LinearLayout
                    android:orientation="vertical"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content">

                    <TextView
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:textColor="@color/error_color"
                        android:textSize="20sp"
                        android:text="This text is part of first Cardview\n\n"/>

                </LinearLayout>

            </android.support.v7.widget.CardView>

            <android.support.v7.widget.CardView
                android:layout_marginLeft="10dp"
                android:layout_marginRight="10dp"
                android:layout_marginTop="10dp"
                android:layout_width="match_parent"
                android:layout_height="wrap_content">

                <LinearLayout
                    android:orientation="vertical"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content">

                    <TextView
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:textSize="20sp"
                        android:textColor="@color/abc_search_url_text"
                        android:text="This text is part of second Cardview\n\n"/>

                </LinearLayout>

            </android.support.v7.widget.CardView>

        </LinearLayout>

    </android.support.v4.widget.NestedScrollView>
</android.support.design.widget.CoordinatorLayout>

在MainActivity中，我想听一下滚动。我确实喜欢这个：

public class MainActivity extends AppCompatActivity {

    private NestedScrollView nestedScrollView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        nestedScrollView = (NestedScrollView) findViewById(R.id.scroll);
        nestedScrollView.setOnScrollChangeListener(new NestedScrollView.OnScrollChangeListener() {
            @Override
            public void onScrollChange(NestedScrollView v, int scrollX, int scrollY, int oldScrollX, int oldScrollY) {
                System.out.println("I am scrolling the view...");
            }
        });
    }
}

Answer 1

我在没有

的情况下尝试了相同的代码

app:layout_behavior="@string/appbar_scrolling_view_behavior"

在NestedScrollView中，它对我有用。试一试

如何在NestedScrollView中处理滚动

1 个答案: