我试图通过代码更改布局的高度但没有成功。我已经尝试了我在这里和其他网站看到的所有示例，我的应用程序一直在关闭。
xml code:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/main_lay"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity" >
<LinearLayout
android:id="@+id/layout_add"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
>
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="50dp"
android:background="@color/green">
<ImageView
android:layout_width="fill_parent"
android:contentDescription="@string/desc"
android:layout_height="45dp"
android:layout_gravity="center_vertical|left"
android:scaleType="fitStart"
android:background="@color/orange"
android:src="@drawable/logo"
>
</ImageView>
</LinearLayout>
</LinearLayout>
Java code:
main_layout=(LinearLayout)findViewById(R.id.main_lay);
main_layout.setLayoutParams(new FrameLayout.LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT));
main_layout.setBackgroundResource(R.color.white);
layout_add = (LinearLayout) findViewById(R.id.layout_add);
layout_add.setLayoutParams(new FrameLayout.LayoutParams(LayoutParams.FILL_PARENT,50 ));
layout_add.setBackgroundResource(R.color.dark_grey);
我不明白我做错了什么。我已经尝试了不同的方法来修复它。"后轮"设置工作正常。谢谢你们尼罗
这是日志猫
12-09 16:12:39.007: E/AnalyticsSDKTest.cpp(6338): Time w/ UTC Offset: 2012-12-09
12-09 16:16:14.517: E/ActivityManager(121): fail to set top app changed!
12-09 16:16:14.547: E/InputDispatcher(121): channel '4056b9c8 com.nirosadvice.converter/com.nirosadvice.converter.MainActivity (server)' ~ Consumer closed input channel or an error occurred. events=0x8
12-09 16:16:14.547: E/InputDispatcher(121): channel '4056b9c8 com.nirosadvice.converter/com.nirosadvice.converter.MainActivity (server)' ~ Channel is unrecoverably broken and will be disposed!
12-09 16:16:18.071: E/PVWmdrmProxy(5716): binder died for component: ComponentInfo{com.pv.wmdrmservice/com.pv.wmdrmservice.PVWmdrmService}
12-09 16:16:18.161: E/AndroidRuntime(18911): FATAL EXCEPTION: main
12-09 16:16:18.161: E/AndroidRuntime(18911): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.nirosadvice.converter/com.nirosadvice.converter.MainActivity}: java.lang.RuntimeException: Binary XML file line #1: You must supply a layout_width attribute.
12-09 16:16:18.161: E/AndroidRuntime(18911): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1821)
12-09 16:16:18.161: E/AndroidRuntime(18911): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1842)
12-09 16:16:18.161: E/AndroidRuntime(18911): at android.app.ActivityThread.access$1500(ActivityThread.java:132)
12-09 16:16:18.161: E/AndroidRuntime(18911): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1038)
12-09 16:16:18.161: E/AndroidRuntime(18911): at android.os.Handler.dispatchMessage(Handler.java:99)
12-09 16:16:18.161: E/AndroidRuntime(18911): at android.os.Looper.loop(Looper.java:150)
12-09 16:16:18.161: E/AndroidRuntime(18911): at android.app.ActivityThread.main(ActivityThread.java:4263)
12-09 16:16:18.161: E/AndroidRuntime(18911): at java.lang.reflect.Method.invokeNative(Native Method)
12-09 16:16:18.161: E/AndroidRuntime(18911): at java.lang.reflect.Method.invoke(Method.java:507)
12-09 16:16:18.161: E/AndroidRuntime(18911): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
12-09 16:16:18.161: E/AndroidRuntime(18911): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
12-09 16:16:18.161: E/AndroidRuntime(18911): at dalvik.system.NativeStart.main(Native Method)
12-09 16:16:18.161: E/AndroidRuntime(18911): Caused by: java.lang.RuntimeException: Binary XML file line #1: You must supply a layout_width attribute.
12-09 16:16:18.161: E/AndroidRuntime(18911): at android.content.res.TypedArray.getLayoutDimension(TypedArray.java:491)
12-09 16:16:18.161: E/AndroidRuntime(18911): at android.view.ViewGroup$LayoutParams.setBaseAttributes(ViewGroup.java:3684)
12-09 16:16:18.161: E/AndroidRuntime(18911): at android.view.ViewGroup$MarginLayoutParams.<init>(ViewGroup.java:3764)
12-09 16:16:18.161: E/AndroidRuntime(18911): at android.widget.FrameLayout$LayoutParams.<init>(FrameLayout.java:457)
12-09 16:16:18.161: E/AndroidRuntime(18911): at android.widget.FrameLayout.generateLayoutParams(FrameLayout.java:423)
12-09 16:16:18.161: E/AndroidRuntime(18911): at android.widget.FrameLayout.generateLayoutParams(FrameLayout.java:47)
12-09 16:16:18.161: E/AndroidRuntime(18911): at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
12-09 16:16:18.161: E/AndroidRuntime(18911): at android.view.LayoutInflater.inflate(LayoutInflater.java:320)
12-09 16:16:18.161: E/AndroidRuntime(18911): at android.view.LayoutInflater.inflate(LayoutInflater.java:276)
12-09 16:16:18.161: E/AndroidRuntime(18911): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:231)
12-09 16:16:18.161: E/AndroidRuntime(18911): at android.app.Activity.setContentView(Activity.java:1715)
12-09 16:16:18.161: E/AndroidRuntime(18911): at com.nirosadvice.converter.MainActivity.onCreate(MainActivity.java:87)
12-09 16:16:18.161: E/AndroidRuntime(18911): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1072)
12-09 16:16:18.161: E/AndroidRuntime(18911): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1785)
12-09 16:16:18.161: E/AndroidRuntime(18911): ... 11 more
谢谢
在 Iv'e 将属性添加到 XML 之后 - 这就是我得到的：
CatLog:
12-09 16:42:33.168: E/AndroidRuntime(19065): FATAL EXCEPTION: main
12-09 16:42:33.168: E/AndroidRuntime(19065): java.lang.ClassCastException: android.view.ViewGroup$LayoutParams
12-09 16:42:33.168: E/AndroidRuntime(19065): at android.widget.LinearLayout.measureVertical(LinearLayout.java:360)
12-09 16:42:33.168: E/AndroidRuntime(19065): at android.widget.LinearLayout.onMeasure(LinearLayout.java:309)
12-09 16:42:33.168: E/AndroidRuntime(19065): at android.view.View.measure(View.java:8526)
12-09 16:42:33.168: E/AndroidRuntime(19065): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3224)
12-09 16:42:33.168: E/AndroidRuntime(19065): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
12-09 16:42:33.168: E/AndroidRuntime(19065): at android.view.View.measure(View.java:8526)
12-09 16:42:33.168: E/AndroidRuntime(19065): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3224)
12-09 16:42:33.168: E/AndroidRuntime(19065): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
12-09 16:42:33.168: E/AndroidRuntime(19065): at android.view.View.measure(View.java:8526)
12-09 16:42:33.168: E/AndroidRuntime(19065): at android.view.ViewRoot.performTraversals(ViewRoot.java:902)
12-09 16:42:33.168: E/AndroidRuntime(19065): at android.view.ViewRoot.handleMessage(ViewRoot.java:1957)
12-09 16:42:33.168: E/AndroidRuntime(19065): at android.os.Handler.dispatchMessage(Handler.java:99)
12-09 16:42:33.168: E/AndroidRuntime(19065): at android.os.Looper.loop(Looper.java:150)
12-09 16:42:33.168: E/AndroidRuntime(19065): at android.app.ActivityThread.main(ActivityThread.java:4263)
12-09 16:42:33.168: E/AndroidRuntime(19065): at java.lang.reflect.Method.invokeNative(Native Method)
12-09 16:42:33.168: E/AndroidRuntime(19065): at java.lang.reflect.Method.invoke(Method.java:507)
12-09 16:42:33.168: E/AndroidRuntime(19065): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
12-09 16:42:33.168: E/AndroidRuntime(19065): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
12-09 16:42:33.168: E/AndroidRuntime(19065): at dalvik.system.NativeStart.main(Native Method)
12-09 16:42:39.023: E/AnalyticsSDKTest.cpp(6338): Time w/ UTC Offset: 2012-12-09 21:42:39-05:00
12-09 16:42:49.013: E/AndroidRuntime(19095): FATAL EXCEPTION: main
12-09 16:42:49.013: E/AndroidRuntime(19095): java.lang.ClassCastException: android.view.ViewGroup$LayoutParams
12-09 16:42:49.013: E/AndroidRuntime(19095): at android.widget.LinearLayout.measureVertical(LinearLayout.java:360)
12-09 16:42:49.013: E/AndroidRuntime(19095): at android.widget.LinearLayout.onMeasure(LinearLayout.java:309)
12-09 16:42:49.013: E/AndroidRuntime(19095): at android.view.View.measure(View.java:8526)
12-09 16:42:49.013: E/AndroidRuntime(19095): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3224)
12-09 16:42:49.013: E/AndroidRuntime(19095): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
12-09 16:42:49.013: E/AndroidRuntime(19095): at android.view.View.measure(View.java:8526)
12-09 16:42:49.013: E/AndroidRuntime(19095): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3224)
12-09 16:42:49.013: E/AndroidRuntime(19095): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
12-09 16:42:49.013: E/AndroidRuntime(19095): at android.view.View.measure(View.java:8526)
12-09 16:42:49.013: E/AndroidRuntime(19095): at android.view.ViewRoot.performTraversals(ViewRoot.java:902)
12-09 16:42:49.013: E/AndroidRuntime(19095): at android.view.ViewRoot.handleMessage(ViewRoot.java:1957)
12-09 16:42:49.013: E/AndroidRuntime(19095): at android.os.Handler.dispatchMessage(Handler.java:99)
12-09 16:42:49.013: E/AndroidRuntime(19095): at android.os.Looper.loop(Looper.java:150)
12-09 16:42:49.013: E/AndroidRuntime(19095): at android.app.ActivityThread.main(ActivityThread.java:4263)
12-09 16:42:49.013: E/AndroidRuntime(19095): at java.lang.reflect.Method.invokeNative(Native Method)
12-09 16:42:49.013: E/AndroidRuntime(19095): at java.lang.reflect.Method.invoke(Method.java:507)
12-09 16:42:49.013: E/AndroidRuntime(19095): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
12-09 16:42:49.013: E/AndroidRuntime(19095): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
12-09 16:42:49.013: E/AndroidRuntime(19095): at dalvik.system.NativeStart.main(Native Method)
12-09 16:44:00.913: E/AndroidRuntime(19148): FATAL EXCEPTION: main
12-09 16:44:00.913: E/AndroidRuntime(19148): java.lang.ClassCastException: android.view.ViewGroup$LayoutParams
12-09 16:44:00.913: E/AndroidRuntime(19148): at android.widget.LinearLayout.measureVertical(LinearLayout.java:360)
12-09 16:44:00.913: E/AndroidRuntime(19148): at android.widget.LinearLayout.onMeasure(LinearLayout.java:309)
12-09 16:44:00.913: E/AndroidRuntime(19148): at android.view.View.measure(View.java:8526)
12-09 16:44:00.913: E/AndroidRuntime(19148): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3224)
12-09 16:44:00.913: E/AndroidRuntime(19148): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
12-09 16:44:00.913: E/AndroidRuntime(19148): at android.view.View.measure(View.java:8526)
12-09 16:44:00.913: E/AndroidRuntime(19148): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3224)
12-09 16:44:00.913: E/AndroidRuntime(19148): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
12-09 16:44:00.913: E/AndroidRuntime(19148): at android.view.View.measure(View.java:8526)
12-09 16:44:00.913: E/AndroidRuntime(19148): at android.view.ViewRoot.performTraversals(ViewRoot.java:902)
12-09 16:44:00.913: E/AndroidRuntime(19148): at android.view.ViewRoot.handleMessage(ViewRoot.java:1957)
12-09 16:44:00.913: E/AndroidRuntime(19148): at android.os.Handler.dispatchMessage(Handler.java:99)
12-09 16:44:00.913: E/AndroidRuntime(19148): at android.os.Looper.loop(Looper.java:150)
12-09 16:44:00.913: E/AndroidRuntime(19148): at android.app.ActivityThread.main(ActivityThread.java:4263)
12-09 16:44:00.913: E/AndroidRuntime(19148): at java.lang.reflect.Method.invokeNative(Native Method)
12-09 16:44:00.913: E/AndroidRuntime(19148): at java.lang.reflect.Method.invoke(Method.java:507)
12-09 16:44:00.913: E/AndroidRuntime(19148): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
12-09 16:44:00.913: E/AndroidRuntime(19148): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
12-09 16:44:00.913: E/AndroidRuntime(19148): at dalvik.system.NativeStart.main(Native Method)
12-09 16:44:02.935: E/InputDispatcher(121): channel '4056b9c8 com.nirosadvice.converter/com.nirosadvice.converter.MainActivity (server)' ~ Consumer closed input channel or an error occurred. events=0x8
12-09 16:44:02.935: E/InputDispatcher(121): channel '4056b9c8 com.nirosadvice.converter/com.nirosadvice.converter.MainActivity (server)' ~ Channel is unrecoverably broken and will be disposed!
12-09 16:45:25.075: E/AndroidRuntime(19210): FATAL EXCEPTION: main
12-09 16:45:25.075: E/AndroidRuntime(19210): java.lang.ClassCastException: android.view.ViewGroup$LayoutParams
12-09 16:45:25.075: E/AndroidRuntime(19210): at android.widget.LinearLayout.measureVertical(LinearLayout.java:360)
12-09 16:45:25.075: E/AndroidRuntime(19210): at android.widget.LinearLayout.onMeasure(LinearLayout.java:309)
12-09 16:45:25.075: E/AndroidRuntime(19210): at android.view.View.measure(View.java:8526)
12-09 16:45:25.075: E/AndroidRuntime(19210): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3224)
12-09 16:45:25.075: E/AndroidRuntime(19210): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
12-09 16:45:25.075: E/AndroidRuntime(19210): at android.view.View.measure(View.java:8526)
12-09 16:45:25.075: E/AndroidRuntime(19210): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3224)
12-09 16:45:25.075: E/AndroidRuntime(19210): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
12-09 16:45:25.075: E/AndroidRuntime(19210): at android.view.View.measure(View.java:8526)
12-09 16:45:25.075: E/AndroidRuntime(19210): at android.view.ViewRoot.performTraversals(ViewRoot.java:902)
12-09 16:45:25.075: E/AndroidRuntime(19210): at android.view.ViewRoot.handleMessage(ViewRoot.java:1957)
12-09 16:45:25.075: E/AndroidRuntime(19210): at android.os.Handler.dispatchMessage(Handler.java:99)
12-09 16:45:25.075: E/AndroidRuntime(19210): at android.os.Looper.loop(Looper.java:150)
12-09 16:45:25.075: E/AndroidRuntime(19210): at android.app.ActivityThread.main(ActivityThread.java:4263)
12-09 16:45:25.075: E/AndroidRuntime(19210): at java.lang.reflect.Method.invokeNative(Native Method)
12-09 16:45:25.075: E/AndroidRuntime(19210): at java.lang.reflect.Method.invoke(Method.java:507)
12-09 16:45:25.075: E/AndroidRuntime(19210): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
12-09 16:45:25.075: E/AndroidRuntime(19210): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
12-09 16:45:25.075: E/AndroidRuntime(19210): at dalvik.system.NativeStart.main(Native Method)
12-09 16:50:34.507: E/AndroidRuntime(19358): FATAL EXCEPTION: main
12-09 16:50:34.507: E/AndroidRuntime(19358): java.lang.ClassCastException: android.view.ViewGroup$LayoutParams
12-09 16:50:34.507: E/AndroidRuntime(19358): at android.widget.LinearLayout.measureVertical(LinearLayout.java:360)
12-09 16:50:34.507: E/AndroidRuntime(19358): at android.widget.LinearLayout.onMeasure(LinearLayout.java:309)
12-09 16:50:34.507: E/AndroidRuntime(19358): at android.view.View.measure(View.java:8526)
12-09 16:50:34.507: E/AndroidRuntime(19358): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3224)
12-09 16:50:34.507: E/AndroidRuntime(19358): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
12-09 16:50:34.507: E/AndroidRuntime(19358): at android.view.View.measure(View.java:8526)
12-09 16:50:34.507: E/AndroidRuntime(19358): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3224)
12-09 16:50:34.507: E/AndroidRuntime(19358): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
12-09 16:50:34.507: E/AndroidRuntime(19358): at android.view.View.measure(View.java:8526)
12-09 16:50:34.507: E/AndroidRuntime(19358): at android.view.ViewRoot.performTraversals(ViewRoot.java:902)
12-09 16:50:34.507: E/AndroidRuntime(19358): at android.view.ViewRoot.handleMessage(ViewRoot.java:1957)
12-09 16:50:34.507: E/AndroidRuntime(19358): at android.os.Handler.dispatchMessage(Handler.java:99)
12-09 16:50:34.507: E/AndroidRuntime(19358): at android.os.Looper.loop(Looper.java:150)
12-09 16:50:34.507: E/AndroidRuntime(19358): at android.app.ActivityThread.main(ActivityThread.java:4263)
12-09 16:50:34.507: E/AndroidRuntime(19358): at java.lang.reflect.Method.invokeNative(Native Method)
12-09 16:50:34.507: E/AndroidRuntime(19358): at java.lang.reflect.Method.invoke(Method.java:507)
12-09 16:50:34.507: E/AndroidRuntime(19358): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
12-09 16:50:34.507: E/AndroidRuntime(19358): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
12-09 16:50:34.507: E/AndroidRuntime(19358): at dalvik.system.NativeStart.main(Native Method)
第三次尝试 - 将帧更改为线性后：
12-09 17:42:39.076: E/AnalyticsSDKTest.cpp(6338): Time w/ UTC Offset: 2012-12-09 22:42:39-05:00
12-09 17:55:44.141: E/ActivityManager(121): Fix ANR:broadcast when App died
12-09 17:55:44.722: E/AndroidRuntime(19469): FATAL EXCEPTION: main
12-09 17:55:44.722: E/AndroidRuntime(19469): java.lang.ClassCastException: android.view.ViewGroup$LayoutParams
12-09 17:55:44.722: E/AndroidRuntime(19469): at android.widget.LinearLayout.measureVertical(LinearLayout.java:360)
12-09 17:55:44.722: E/AndroidRuntime(19469): at android.widget.LinearLayout.onMeasure(LinearLayout.java:309)
12-09 17:55:44.722: E/AndroidRuntime(19469): at android.view.View.measure(View.java:8526)
12-09 17:55:44.722: E/AndroidRuntime(19469): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3224)
12-09 17:55:44.722: E/AndroidRuntime(19469): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
12-09 17:55:44.722: E/AndroidRuntime(19469): at android.view.View.measure(View.java:8526)
12-09 17:55:44.722: E/AndroidRuntime(19469): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3224)
12-09 17:55:44.722: E/AndroidRuntime(19469): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
12-09 17:55:44.722: E/AndroidRuntime(19469): at android.view.View.measure(View.java:8526)
12-09 17:55:44.722: E/AndroidRuntime(19469): at android.view.ViewRoot.performTraversals(ViewRoot.java:902)
12-09 17:55:44.722: E/AndroidRuntime(19469): at android.view.ViewRoot.handleMessage(ViewRoot.java:1957)
12-09 17:55:44.722: E/AndroidRuntime(19469): at android.os.Handler.dispatchMessage(Handler.java:99)
12-09 17:55:44.722: E/AndroidRuntime(19469): at android.os.Looper.loop(Looper.java:150)
12-09 17:55:44.722: E/AndroidRuntime(19469): at android.app.ActivityThread.main(ActivityThread.java:4263)
12-09 17:55:44.722: E/AndroidRuntime(19469): at java.lang.reflect.Method.invokeNative(Native Method)
12-09 17:55:44.722: E/AndroidRuntime(19469): at java.lang.reflect.Method.invoke(Method.java:507)
12-09 17:55:44.722: E/AndroidRuntime(19469): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
12-09 17:55:44.722: E/AndroidRuntime(19469): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
12-09 17:55:44.722: E/AndroidRuntime(19469): at dalvik.system.NativeStart.main(Native Method)
您应该
尝试为您的layout_add提供线性布局layout_width和layout_height。我不确定这是不是问题所在，但是日志猫的这一行让我认为可能是
Caused by: java.lang.RuntimeException: Binary XML file line #1: You must supply a layout_width attribute.
第二个错误你看起来就像它正在发生，因为这个
main_layout.setLayoutParams(new FrameLayout.LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT));
应该是这个
main_layout.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT));
您需要
为 XML 中的所有 LinearLayout（以及一般的所有视图和视图组）提供layout_width和 layout_height 属性，即使您计划稍后在代码中重写它们。