Question

我在我的应用中展示了admob广告，我想要做的是使用advert_container的高度来设置marginBottom的{{1}}。

这些是我的布局;

activity_book

book_frame

book_toolbar

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:ads="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

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

    <include layout="@layout/share_layout"/>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:orientation="vertical"
        android:visibility="gone"
        android:background="#777777"
        android:id="@+id/advert_container"
        android:layout_centerHorizontal="true">
        <View
            android:layout_width="match_parent"
            android:layout_height="15dp"
            android:background="#777777"
            android:id="@+id/dviewtop"/>

        <com.google.android.gms.ads.AdView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/banner_id"
            ads:adSize="SMART_BANNER"
            ads:adUnitId="ca-app-pub-XXXXXXXXXXXXXXXXXXXXXXXXX"/>
    </LinearLayout>

</RelativeLayout>

这是我的活动：

BookActivity

<?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"
    tools:context=".BookActivity">

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

        <android.support.v7.widget.Toolbar
            android:id="@+id/book_toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:layout_scrollFlags="scroll|enterAlways"
            app:popupTheme="@style/AppTheme.PopupOverlay"/>

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

    <FrameLayout
        android:id="@+id/book_frame"
        android:layout_width="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"
        android:layout_height="match_parent"/> 
</android.support.design.widget.CoordinatorLayout>

问题在于它抛出了//I skipped a lot a of codes that's not necessary @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Log.d(TAG, "onCreate called"); setContentView(R.layout.activity_book); mToolbar = (Toolbar) findViewById(R.id.book_toolbar); mFragLayout = (FrameLayout) findViewById(R.id.book_frame); advertCont = (LinearLayout) findViewById(R.id.advert_container); adView = (AdView) findViewById(R.id.banner_id); AdRequest adRequest = new AdRequest.Builder() .addTestDevice("XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX") .build(); adView.loadAd(adRequest); ViewTreeObserver observer = advertCont.getViewTreeObserver(); observer.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() { @Override public void onGlobalLayout() { adHeight = adView.getMeasuredHeight(); Log.d(TAG, "The height of the advertL is " + adHeight); if (adHeight > 1) { FrameLayout.LayoutParams params = (FrameLayout.LayoutParams)mFragLayout.getLayoutParams(); params.setMargins(0, 0, 0, adHeight); mFragLayout.setLayoutParams(params); } } }); }异常。

堆栈跟踪

ClassCastException

在堆栈跟踪中，第87行是06-17 13:59:56.637 31869-31869/com.ozuf.bookhistory E/AndroidRuntime: FATAL EXCEPTION: main Process: com.ozuf.bookhistory, PID: 31869 java.lang.ClassCastException: android.support.design.widget.CoordinatorLayout$LayoutParams cannot be cast to android.widget.FrameLayout$LayoutParams at com.ozuf.bookhistory.BookActivity$1.onGlobalLayout(BookActivity.java:87) at android.view.ViewTreeObserver.dispatchOnGlobalLayout(ViewTreeObserver.java:912) at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1911) at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1073) at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5988) 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:5910) 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:1405) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1200)。

请对此有解决方案吗？

Answer 1

尝试更改

FrameLayout.LayoutParams params = 
(FrameLayout.LayoutParams)mFragLayout.getLayoutParams();

到

CoordinatorLayout.LayoutParams params = 
(CoordinatorLayout.LayoutParams)mFragLayout.getLayoutParams();

这是因为协调器布局是父布局，您需要设置父布局的布局参数。

Answer 2

LayoutPrams适用于最顶层视图或当前视图的父级 ....

使用此

CoordinatorLayout.LayoutParams params = (CoordinatorLayout.LayoutParams)mFragLayout.getLayoutParams();

而不是

FrameLayout.LayoutParams params = (FrameLayout.LayoutParams)mFragLayout.getLayoutParams();

享受编码...

如何使用LinearLayout的高度设置FrameLayout的边距

2 个答案: