android:设置布局参数LayoutParams-白红宇

android:设置布局参数LayoutParams

阅读量：4973 次

发布时间：2019-06-12

本文共 3617 字，大约阅读时间需要 12 分钟。

在adapter的getView中给view设置布局参数时，使用下面方法：

LayoutParams params = new LayoutParams(                        LayoutParams.FILL_PARENT,                        (int) (metrics.heightPixels * 0.23f + 0.5f));                convertView.setLayoutParams(params);

程序会出现错误

06-08 15:39:43.071: E/AndroidRuntime(610): java.lang.ClassCastException: android.view.ViewGroup$LayoutParams06-08 15:39:43.071: E/AndroidRuntime(610):     at android.widget.ListView.setupChild(ListView.java:1688)06-08 15:39:43.071: E/AndroidRuntime(610):     at android.widget.ListView.makeAndAddView(ListView.java:1661)06-08 15:39:43.071: E/AndroidRuntime(610):     at android.widget.ListView.fillDown(ListView.java:637)06-08 15:39:43.071: E/AndroidRuntime(610):     at android.widget.ListView.fillFromTop(ListView.java:694)06-08 15:39:43.071: E/AndroidRuntime(610):     at android.widget.ListView.layoutChildren(ListView.java:1516)06-08 15:39:43.071: E/AndroidRuntime(610):     at android.widget.AbsListView.onLayout(AbsListView.java:1112)06-08 15:39:43.071: E/AndroidRuntime(610):     at android.view.View.layout(View.java:6569)06-08 15:39:43.071: E/AndroidRuntime(610):     at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1119)06-08 15:39:43.071: E/AndroidRuntime(610):     at android.widget.LinearLayout.layoutHorizontal(LinearLayout.java:1108)06-08 15:39:43.071: E/AndroidRuntime(610):     at android.widget.LinearLayout.onLayout(LinearLayout.java:920)06-08 15:39:43.071: E/AndroidRuntime(610):     at android.view.View.layout(View.java:6569)06-08 15:39:43.071: E/AndroidRuntime(610):     at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1119)06-08 15:39:43.071: E/AndroidRuntime(610):     at android.widget.LinearLayout.layoutVertical(LinearLayout.java:998)06-08 15:39:43.071: E/AndroidRuntime(610):     at android.widget.LinearLayout.onLayout(LinearLayout.java:918)06-08 15:39:43.071: E/AndroidRuntime(610):     at android.view.View.layout(View.java:6569)06-08 15:39:43.071: E/AndroidRuntime(610):     at android.widget.FrameLayout.onLayout(FrameLayout.java:333)06-08 15:39:43.071: E/AndroidRuntime(610):     at android.view.View.layout(View.java:6569)06-08 15:39:43.071: E/AndroidRuntime(610):     at android.widget.FrameLayout.onLayout(FrameLayout.java:333)06-08 15:39:43.071: E/AndroidRuntime(610):     at android.view.View.layout(View.java:6569)06-08 15:39:43.071: E/AndroidRuntime(610):     at android.view.ViewRoot.performTraversals(ViewRoot.java:979)06-08 15:39:43.071: E/AndroidRuntime(610):     at android.view.ViewRoot.handleMessage(ViewRoot.java:1613)06-08 15:39:43.071: E/AndroidRuntime(610):     at android.os.Handler.dispatchMessage(Handler.java:99)06-08 15:39:43.071: E/AndroidRuntime(610):     at android.os.Looper.loop(Looper.java:123)06-08 15:39:43.071: E/AndroidRuntime(610):     at android.app.ActivityThread.main(ActivityThread.java:4203)06-08 15:39:43.071: E/AndroidRuntime(610):     at java.lang.reflect.Method.invokeNative(Native Method)06-08 15:39:43.071: E/AndroidRuntime(610):     at java.lang.reflect.Method.invoke(Method.java:521)06-08 15:39:43.071: E/AndroidRuntime(610):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)06-08 15:39:43.071: E/AndroidRuntime(610):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549)

但最后设置如下时：

ViewGroup.LayoutParams param = convertView.getLayoutParams();                param.height = (int) (metrics.heightPixels * 0.20f + 0.5f);                convertView.setLayoutParams(param);

就OK。

里也是一样的情况

给LinearLayout设置LayoutParams时用初始的方法则没有问题

暂时不知何解？

转载于:https://www.cnblogs.com/mybkn/archive/2012/06/08/2542581.html

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