Question

我想使用带有协调器布局Facebook的appbar进行个人资料活动，但我不知道如何在appbar向上滚动时隐藏视图并且我的视图卡在工具栏后面

我想要的：完整资料 - ＆gt;滚动时淡出 - ＆gt;完全滚动时的操作栏

我有什么：

我使用了Android Studio中的滚动活动示例并进行了编辑：

<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:fitsSystemWindows="true"
    tools:context=".ScrollingActivity">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/app_bar"
        android:fitsSystemWindows="true"
        android:layout_height="@dimen/app_bar_height"
        android:layout_width="match_parent"
        android:theme="@style/AppTheme.AppBarOverlay">

        <android.support.design.widget.CollapsingToolbarLayout
            android:id="@+id/toolbar_layout"
            android:fitsSystemWindows="true"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="@drawable/bg_proflie"
            app:layout_scrollFlags="scroll|exitUntilCollapsed"
            app:contentScrim="?attr/colorPrimary">

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


              </android.support.v7.widget.Toolbar>
            <LinearLayout
                android:weightSum="5"
                android:orientation="horizontal"
                android:layout_marginTop="?attr/actionBarSize"
                android:layout_width="match_parent"
                android:layout_height="wrap_content">
                <LinearLayout
                    android:layout_width="0dp"
                    android:layout_weight="2"
                    android:orientation="vertical"
                    android:padding="12dp"
                    android:layout_height="wrap_content">
                    <ImageView
                        android:id="@+id/img_profile_pic"
                        android:layout_width="match_parent"
                        android:layout_height="match_parent"
                        android:scaleType="centerInside"
                        android:adjustViewBounds="true"
                        android:src="@drawable/ic_profile"/>
                </LinearLayout>
                <LinearLayout
                    android:layout_width="0dp"
                    android:layout_weight="3"
                    android:layout_gravity="center_vertical"
                    android:orientation="vertical"
                    android:layout_height="wrap_content">
                    <TextView
                        android:id="@+id/txt_alias"
                        android:textSize="28sp"
                        android:textColor="@color/white"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content" />
                    <TextView
                        android:id="@+id/txt_name"
                        android:textSize="14sp"
                        android:textColor="@color/white"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content" />
                    <TextView
                        android:id="@+id/txt_district"
                        android:textSize="14sp"
                        android:textColor="@color/white"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content" />
                    <RelativeLayout
                        android:visibility="gone"
                        android:id="@+id/rlt_player_status"
                        android:background="@drawable/profile_box"
                        android:layout_marginTop="5dp"
                        android:layout_marginBottom="5dp"
                        android:paddingTop="5dp"
                        android:paddingBottom="5dp"
                        android:paddingLeft="12dp"
                        android:paddingRight="12dp"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content">
                        <TextView
                            android:id="@+id/txt_profile_status"
                            android:text="@string/txt_profile_status_unknown"
                            android:textColor="@color/white"
                            android:textSize="11sp"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content" />
                    </RelativeLayout>
                </LinearLayout>
            </LinearLayout>

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

    <include layout="@layout/content_scrolling" />

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="@dimen/fab_margin"
        app:layout_anchor="@id/app_bar"
        app:layout_anchorGravity="bottom|end"
        android:src="@drawable/ic_edit_profile" />

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

Answer 1

利用private static final int BUFFER_SEGMENT_SIZE = 64 * 1024; private static final int RENDERER_COUNT = 1;//since you want to render simple audio private static final int minBufferMs = 2500; private static final int minRebufferMs = 5000; private static final int BUFFER_SEGMENT_COUNT = 256; //////////////////////////////////////////////////////// this.exoPlayer = ExoPlayer.Factory.newInstance(RENDERER_COUNT, minBufferMs, minRebufferMs); this.exoPlayer.addListener(this);偏移量来确定视图的alpha值。基本上，这就是Facebook应用程序所做的事情，淡入/淡出视图。

            Allocator allocator = new DefaultAllocator(BUFFER_SEGMENT_SIZE);

            DataSource dataSource = new DefaultHttpDataSource(userAgent, null, null);
            sampleSource = new ExtractorSampleSource(uri,
                    dataSource
                    , allocator,
                    BUFFER_SEGMENT_SIZE,
                    BUFFER_SEGMENT_COUNT * BUFFER_SEGMENT_SIZE);
        }
        MediaCodecAudioTrackRenderer audioRenderer = new MediaCodecAudioTrackRenderer(sampleSource);
   exoPlayer.prepare(audioRenderer);
        exoPlayer.setPlayWhenReady(true);

这将使您的视图在总滚动范围和半滚动范围内淡入或淡出。

之后，只需使用AppBarLayout方法将此public class FadingViewOffsetListener implements AppBarLayout.OnOffsetChangedListener { private View mView; public FadingViewOffsetListener(View view) { mView = view; } @Override public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) { verticalOffset = Math.abs(verticalOffset); float halfScrollRange = (int) (appBarLayout.getTotalScrollRange() * 0.5f); float ratio = (float) verticalOffset / halfScrollRange; ratio = Math.max(0f, Math.min(1f, ratio)); ViewCompat.setAlpha(mView, ratio); } }实施的实例传递给OnOffsetChangedListener。

Answer 2

我找到了如何通过XML解决这个问题，只是在Process.getInputStream()而不是CollpasingBarLayout中替换布局。

所以这个：

toolBar

它看起来像这样：

如何在AppBar上隐藏ImageView，如Facebook Profile？

2 个答案: