android - 折叠工具栏在 coordinatorlayout 中滚动时不折叠

Question

我在 Cordinator 布局中使用了折叠工具栏，但折叠栏仍然没有折叠，仍然保持滚动状态。

这是activity_demo.xml -

    <?xml version="1.0" encoding="utf-8"?>
    <android.support.design.widget.CoordinatorLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

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

<!-- Fit the system windows for your CollapsingToolbarLayout
           also set your height to wrap_content and give image a height-->

<android.support.design.widget.CollapsingToolbarLayout
                android:id="@+id/collapsing_toolbar"
                android:fitsSystemWindows="true"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                app:contentScrim="?attr/colorPrimary"
                app:expandedTitleMarginStart="4dp"
                app:expandedTitleMarginEnd="64dp">

                <ImageView
                    android:id="@+id/backdrop"
                    android:layout_width="match_parent"
                    android:layout_height="244dp"
                    android:scaleType="centerCrop"
                    android:fitsSystemWindows="true"
                    android:src="@drawable/cheese"
                    app:layout_collapseMode="parallax"/>
                <!-- Tell your toolbar to scroll|enterAlways -->
                <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_scrollFlags="scroll|enterAlways"/>
                <!-- add layout_gravity="bottom" -->
                <android.support.design.widget.TabLayout
                    android:id="@+id/tabs"
                    android:layout_width="fill_parent"
                    android:layout_height="wrap_content"
                    app:tabSelectedTextColor="?android:attr/textColorPrimaryInverse"
                    app:tabIndicatorColor="?android:attr/textColorPrimaryInverse"
                    app:tabIndicatorHeight="4dp"
                    android:layout_gravity="bottom"/>
            </android.support.design.widget.CollapsingToolbarLayout>
        </android.support.design.widget.AppBarLayout>

        <android.support.v4.widget.NestedScrollView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            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_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_margin="16dp">

                    <LinearLayout
                        style="@style/Widget.CardContent"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content">

                        <TextView
                            android:layout_width="match_parent"
                            android:layout_height="wrap_content"
                            android:text="Info"
                            android:textAppearance="@style/TextAppearance.AppCompat.Title" />

                        <TextView
                            android:layout_width="match_parent"
                            android:layout_height="wrap_content"
                            android:text="@string/cheese_ipsum" />

                    </LinearLayout>

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

                <android.support.v7.widget.CardView
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginBottom="@dimen/card_margin"
                    android:layout_marginLeft="@dimen/card_margin"
                    android:layout_marginRight="@dimen/card_margin">

                    <LinearLayout
                        style="@style/Widget.CardContent"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content">

                        <TextView
                            android:layout_width="match_parent"
                            android:layout_height="wrap_content"
                            android:text="Friends"
                            android:textAppearance="@style/TextAppearance.AppCompat.Title" />

                        <TextView
                            android:layout_width="match_parent"
                            android:layout_height="wrap_content"
                            android:text="@string/cheese_ipsum" />

                    </LinearLayout>

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

                <android.support.v7.widget.CardView
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginBottom="@dimen/card_margin"
                    android:layout_marginLeft="@dimen/card_margin"
                    android:layout_marginRight="@dimen/card_margin">

                    <LinearLayout
                        style="@style/Widget.CardContent"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content">

                        <TextView
                            android:layout_width="match_parent"
                            android:layout_height="wrap_content"
                            android:text="Related"
                            android:textAppearance="@style/TextAppearance.AppCompat.Title" />

                        <TextView
                            android:layout_width="match_parent"
                            android:layout_height="wrap_content"
                            android:text="@string/cheese_ipsum" />

                    </LinearLayout>

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

            </LinearLayout>

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

这是 DemoActivity.java -

    package com.example.priyanshu.iitmandi;

    import android.os.Bundle;
    import android.support.design.widget.CollapsingToolbarLayout;
    import android.support.v7.app.AppCompatActivity;
    import android.support.v7.widget.Toolbar;
    import android.widget.ImageView;

public class DemoActivity extends AppCompatActivity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_demo);

        final Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        CollapsingToolbarLayout collapsingToolbar =
                (CollapsingToolbarLayout) findViewById(R.id.collapsing_toolbar);
        collapsingToolbar.setTitle("Faculty");

        loadBackdrop();
    }

    private void loadBackdrop() {
        final ImageView imageView = (ImageView) findViewById(R.id.backdrop);

        imageView.setImageResource(R.drawable.cheese);
    }

}

如果需要 Activity 的屏幕截图，请告诉我

Answer 1

试试这个建议:

1.你没有添加app:layout_scrollFlags到 CollapsingToolbarLayout

app:layout_scrollFlags="scroll|enterAlways|snap"  //add this
app:contentScrim="?attr/colorPrimary"
app:expandedTitleMarginStart="48dp"
app:expandedTitleMarginEnd="64dp"

2.接下来放<android.support.design.widget.TabLayout来自 CollapsingToolbarLayout并将其添加到 AppBarLayout 下

3.在你的NestedScrollview添加 android:fillViewport="true"有时它会给出所需的输出。

<android.support.v4.widget.NestedScrollView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:fillViewport="true"

编辑

您也可以尝试 CollapsingToolbarLayout

app:layout_scrollFlags="scroll|enterAlways|enterAlwaysCollapsed"

和Toolbar

app:layout_collapseMode="pin"
app:layout_scrollFlags="scroll|exitUntilCollapsed"

它会在滚动期间固定工具栏..