1

我将活动布局从 LinearLayout 更改为 RelativeLayout 但最终出现以下错误：-

09-18 16:18:07.949: E/AndroidRuntime(635): java.lang.ClassCastException: android.widget.RelativeLayout$LayoutParams

除了最后一个 EditText 的 align_parentBottom 属性外，LinearLayout 中的一切都运行良好。应该在底部。

    DisplayMetrics metrics = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(metrics);

        LayoutParams params = new LayoutParams(metrics.widthPixels/3, LayoutParams.WRAP_CONTENT);
        selectOne.setLayoutParams(params);
        selectTwo.setLayoutParams(params);
        selectThree.setLayoutParams(params);

selectOne、selectTwo 和 Three 是页面顶部的按钮。我只在这条线上收到错误。

我的活动 xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@drawable/background_violet"
    android:orientation="vertical" >

    <LinearLayout
        android:id="@+id/selectLayout"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_above="@+id/emptyText1"
        android:layout_alignParentTop="true"
        android:gravity="center"
        android:orientation="vertical" >

        <LinearLayout
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:orientation="horizontal" >

            <Button
                android:id="@+id/selectReleased"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:background="@drawable/not_selected_button"
                android:gravity="center"
                android:text="Released"
                android:textStyle="normal" />

            <Button
                android:id="@+id/selectReleasing"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:background="@drawable/selected_button"
                android:gravity="center"
                android:text="This Weekend"
                android:textStyle="normal" />

            <Button
                android:id="@+id/selectUpcoming"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:background="@drawable/not_selected_button"
                android:gravity="center"
                android:text="Upcoming"
                android:textStyle="normal" />
        </LinearLayout>
    </LinearLayout>

    <LinearLayout
        android:id="@+id/emptyText1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" >

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="5px" />
    </LinearLayout>

    <LinearLayout
        android:id="@+id/monthLayout"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_above="@+id/emptyText2"
        android:layout_below="@+id/emptyText1"
        android:layout_gravity="center"
        android:gravity="center" >

        <Button
            android:id="@+id/select_month"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:fadingEdge="horizontal"
            android:textColor="#000000"
            android:textStyle="bold"
            android:visibility="visible" >
        </Button>
    </LinearLayout>

    <LinearLayout
        android:id="@+id/emptyText2"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" >

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="5px" />
    </LinearLayout>

    <LinearLayout
        android:id="@+id/msgTxt"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_above="@+id/selectAfterLayout"
        android:layout_below="@+id/emptyText2"
        android:layout_gravity="center"
        android:gravity="center" >

        <TextView
            android:id="@+id/msg"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text=""
            android:visibility="invisible" />
    </LinearLayout>

    <LinearLayout
        android:id="@+id/selectAfterLayout"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:orientation="vertical" >

        <LinearLayout
            android:id="@+id/aboveLay"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:orientation="horizontal" >

            <ListView
                android:id="@+id/moviesLV"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1.0" >
            </ListView>
        </LinearLayout>
    </LinearLayout>

    <LinearLayout
        android:id="@+id/textTest111"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" 
        android:layout_alignParentBottom="true">
    </LinearLayout>

</RelativeLayout>

收到以下错误：-




09-18 17:47:52.869: E/AndroidRuntime(1122): FATAL EXCEPTION: main
09-18 17:47:52.869: E/AndroidRuntime(1122): java.lang.ClassCastException: android.widget.RelativeLayout$LayoutParams
09-18 17:47:52.869: E/AndroidRuntime(1122):     at android.widget.LinearLayout.measureHorizontal(LinearLayout.java:654)
09-18 17:47:52.869: E/AndroidRuntime(1122):     at android.widget.LinearLayout.onMeasure(LinearLayout.java:306)
09-18 17:47:52.869: E/AndroidRuntime(1122):     at android.view.View.measure(View.java:8171)
09-18 17:47:52.869: E/AndroidRuntime(1122):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132)
09-18 17:47:52.869: E/AndroidRuntime(1122):     at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1012)
09-18 17:47:52.869: E/AndroidRuntime(1122):     at android.widget.LinearLayout.measureVertical(LinearLayout.java:381)
09-18 17:47:52.869: E/AndroidRuntime(1122):     at android.widget.LinearLayout.onMeasure(LinearLayout.java:304)
09-18 17:47:52.869: E/AndroidRuntime(1122):     at android.view.View.measure(View.java:8171)
09-18 17:47:52.869: E/AndroidRuntime(1122):     at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:578)
09-18 17:47:52.869: E/AndroidRuntime(1122):     at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:362)
09-18 17:47:52.869: E/AndroidRuntime(1122):     at android.view.View.measure(View.java:8171)
09-18 17:47:52.869: E/AndroidRuntime(1122):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132)
09-18 17:47:52.869: E/AndroidRuntime(1122):     at android.widget.FrameLayout.onMeasure(FrameLayout.java:245)
09-18 17:47:52.869: E/AndroidRuntime(1122):     at android.view.View.measure(View.java:8171)
09-18 17:47:52.869: E/AndroidRuntime(1122):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132)
09-18 17:47:52.869: E/AndroidRuntime(1122):     at android.widget.FrameLayout.onMeasure(FrameLayout.java:245)
09-18 17:47:52.869: E/AndroidRuntime(1122):     at android.view.View.measure(View.java:8171)
09-18 17:47:52.869: E/AndroidRuntime(1122):     at android.view.ViewRoot.performTraversals(ViewRoot.java:801)
09-18 17:47:52.869: E/AndroidRuntime(1122):     at android.view.ViewRoot.handleMessage(ViewRoot.java:1727)
09-18 17:47:52.869: E/AndroidRuntime(1122):     at android.os.Handler.dispatchMessage(Handler.java:99)
09-18 17:47:52.869: E/AndroidRuntime(1122):     at android.os.Looper.loop(Looper.java:123)
09-18 17:47:52.869: E/AndroidRuntime(1122):     at android.app.ActivityThread.main(ActivityThread.java:4627)
09-18 17:47:52.869: E/AndroidRuntime(1122):     at java.lang.reflect.Method.invokeNative(Native Method)
09-18 17:47:52.869: E/AndroidRuntime(1122):     at java.lang.reflect.Method.invoke(Method.java:521)
09-18 17:47:52.869: E/AndroidRuntime(1122):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
09-18 17:47:52.869: E/AndroidRuntime(1122):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
09-18 17:47:52.869: E/AndroidRuntime(1122):     at dalvik.system.NativeStart.main(Native Method)

4

2 回答 2

2

当您第一次使用LinearLayout和使用LayoutParams时，您的 IDE 可能会LinearLayout.LayoutParams自动导入，因为那是您使用的那个。现在您已经切换到RelativeLayout，您需要使用RelativeLayout.LayoutParams. 您可以：

  1. 将您的导入语句更改为RelativeLayout.LayoutParamsvsLinearLayout.LayoutParams

  2. 将您的LayoutParams行更改为更具体：RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(...)

于 2012-09-18T13:53:16.223 回答
1

您必须将参数转换为相对布局。尝试这样的事情 LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(metrics.widthPixels/3, LayoutParams.WRAP_CONTENT);

于 2012-09-18T12:11:17.763 回答