视图无法锚定到父级CoordinatorLayout

时间：2016-03-07 12:24:37

标签： android user-interface android-support-library floating android-support-design

这不是我的应用程序，这是将其源代码放在github上的北欧应用程序，我正试图在我的机器上运行soutce。但我一直有这个错误：

03-07 07:12:13.641  12622-12622/com.noxel.apppaneladmintry2 E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.noxel.apppaneladmintry2, PID: 12622
java.lang.IllegalStateException: View can not be anchored to the the parent CoordinatorLayout
        at android.support.design.widget.CoordinatorLayout$LayoutParams.resolveAnchorView(CoordinatorLayout.java:2522)
        at android.support.design.widget.CoordinatorLayout$LayoutParams.findAnchorView(CoordinatorLayout.java:2491)
        at android.support.design.widget.CoordinatorLayout.prepareChildren(CoordinatorLayout.java:619)
        at android.support.design.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:670)
        at android.view.View.measure(View.java:17442)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463)
        at android.widget.FrameLayout.onMeasure(FrameLayout.java:430)
        at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:135)
        at android.view.View.measure(View.java:17442)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463)
        at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436)
        at android.widget.LinearLayout.measureVertical(LinearLayout.java:722)
        at android.widget.LinearLayout.onMeasure(LinearLayout.java:613)
        at android.view.View.measure(View.java:17442)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463)
        at android.widget.FrameLayout.onMeasure(FrameLayout.java:430)
        at android.view.View.measure(View.java:17442)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463)
        at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436)
        at android.widget.LinearLayout.measureVertical(LinearLayout.java:722)
        at android.widget.LinearLayout.onMeasure(LinearLayout.java:613)
        at android.view.View.measure(View.java:17442)
        at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5463)
        at android.widget.FrameLayout.onMeasure(FrameLayout.java:430)
        at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2560)
        at android.view.View.measure(View.java:17442)
        at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2001)
        at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1166)
        at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1372)
        at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1054)
        at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5779)
        at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)
        at android.view.Choreographer.doCallbacks(Choreographer.java:580)
        at android.view.Choreographer.doFrame(Choreographer.java:550)
        at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753)
        at android.os.Handler.handleCallback(Handler.java:739)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:135)
        at android.app.ActivityThread.main(ActivityThread.java:5257)
        at java.lang.reflect.Method.invoke(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:372)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:921)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:716)

这是我的Mainactivity的布局：

    <?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"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.design.widget.AppBarLayout
        style="@style/HeaderBar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?actionBarSize"
            android:theme="@style/ActionBarThemeOverlay"
            app:popupTheme="@style/ActionBarPopupThemeOverlay"
            app:titleTextAppearance="@style/ActionBar.TitleText"/>

        <android.support.design.widget.TabLayout
            android:id="@+id/sliding_tabs"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:tabSelectedTextColor="@color/tabSelectedTextColor"
            app:tabTextColor="@color/tabTextColor"
            app:tabIndicatorColor="@color/tabIndicatorColor"
            app:tabGravity="fill"
            app:tabMode="fixed"/>

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

    <android.support.v4.view.ViewPager
        android:id="@+id/view_pager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/fab_add"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="@dimen/fab_margin"
        android:src="@drawable/fab_ic_add"
        app:backgroundTint="@color/fab_normal"
        app:layout_anchor="@+id/container"
        app:layout_anchorGravity="bottom|right|end"
        app:elevation="4dp"/>

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/background_title"
        android:layout_gravity="bottom|center"
        android:layout_marginBottom="6dp"/>

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

这是我的spash屏幕代码：

public class SplashscreenActivity extends Activity {
    /** Splash screen duration time in milliseconds */
    private static final int DELAY = 1000;
    @Override
    protected void onCreate(final Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_splashscreen);

        // Jump to MainActivity after DELAY milliseconds
        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
                final Intent intent = new Intent(SplashscreenActivity.this, MainActivity.class);
                intent.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
                intent.putExtra(MainActivity.OPENED_FROM_LAUNCHER, true);
                startActivity(intent);
                finish();
            }
        }, DELAY);
    }

    @Override
    public void onBackPressed() {
        // do nothing. Protect from exiting the application when splash screen is shown
    }

}

这是我的启动画面的布局：

<merge xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".SplashscreenActivity" >

<ImageView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:layout_marginBottom="70dp"
    android:scaleType="center"
    android:src="@drawable/nordic_logo" />

<ImageView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@drawable/background_title"
    android:layout_gravity="bottom|center"
    android:layout_marginBottom="6dp"/>

谁能告诉我如何解决这个问题？

6 个答案:

答案 0 :(得分：36)

这开始发生在支持设计库v.23.2.0

中 
@Override
    public void onManagerConnected(int status) {
        if (status == LoaderCallbackInterface.SUCCESS ) {
            // now we can call opencv code !
            //helloworld();

            Log.i(TAG, "OpenCV is ready");
            Mat m1 = Mat.zeros(100,100, CvType.CV_8UC1);
            Mat m2 = Mat.zeros(100,100, CvType.CV_8UC1);
            Mat m3 = Mat.zeros(100,100, CvType.CV_8UC1);
            Core.absdiff(m1,m2,m3);

        } else {
            super.onManagerConnected(status);
        }
    }

我知道这是从v23.2.0开始的，因为我的应用程序在（v.23.1.2）之前工作正常并且在更新后开始出现相同的故障。

错误很简单：

您的一个观点将锚定到其父级协调员布局。但是，从v.23.2.0开始，不再允许这样做。

我认为错误发生在您的FAB中：

compile 'com.android.support:design:23.2.0'

我认为<android.support.design.widget.FloatingActionButton android:id="@+id/fab_add" ... app:layout_anchor="@+id/container" ... /> 是父级CoordinatorLayout

<强>修复

正确的方法是更改​​id/container并使用另一个视图作为锚点（父布局或固定在屏幕底部的任何其他视图）。

答案 1 :(得分：4)

FAB锚定的视图必须是CoordinatorLayout的后代视图。

如果视图是布局，则FAB不得位于布局内，否则锚重力设置将无效。例如：

<android.support.design.widget.CoordinatorLayout
    android:id="@+id/content_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    .
    .
    .
    <FrameLayout
        android:id="@+id/attachment_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="@dimen/fab_margin_end"
        android:layout_marginTop="@dimen/fab_margin_top"
        android:scaleType="center"
        android:src="@drawable/ic_action_save"
        app:borderWidth="0dp"
        app:elevation="@dimen/fab_elevation"
        app:layout_anchor="@id/attachment_layout"
        app:layout_anchorGravity="top|end"
        app:rippleColor="@color/accent_highlight" />

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

答案 2 :(得分：2)

我的朋友今天通过使用Studio中的“设计”选项卡了解了另一种方式。我拖动我的FAB锚定并找出这段代码 - 

<android.support.design.widget.FloatingActionButton
        android:id="@+id/fab"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:layout_margin="@dimen/activity_horizontal_margin"
        android:src="@drawable/ic_add"
        android:layout_gravity="center_vertical|center_horizontal"
        app:layout_anchor="@+id/appBar"
        app:layout_anchorGravity="bottom|right" />

请注意，这与我使用折叠工具栏完美配合。我甚至尝试设置不同的宽度和工作效果。

  

它也适用于任何版本的支持库。我的是25.0.0

答案 3 :(得分：1)

更改app：layout_anchor，不使用Coodinator

答案 4 :(得分：0)

这是一个老问题，但是我有最好的解决方法。

使用android:layout_gravity="bottom|end"（任何适合您的值） 注意 android 命名空间

此属性根据父视图布局定位FAB。无需创建虚拟的FrameLayout即可锚定。

答案 5 :(得分：0)

所有其他人都很困惑，

  <android.support.design.widget.CoordinatorLayout
        android:id="@+id/coordinatorLayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <FrameLayout
            android:id="@+id/contentFrame"
            android:layout_width="match_parent"
            android:layout_height="match_parent"/>

        <android.support.design.widget.FloatingActionButton
            android:id="@+id/fab_add_notes"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_margin="@dimen/fab_margin"
            android:src="@drawable/ic_add"
            app:fabSize="normal"
            app:layout_anchor="@id/contentFrame"
            app:layout_anchorGravity="bottom|right|end"/>
    </android.support.design.widget.CoordinatorLayout>
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