我是Android新手，我在the official android site遇到了有关如何创建GridView图片的教程。我使用kotlin作为首选语言。在扩展BaseAdapter的适配器类中，我正在尝试按照教程中的说明设置imageview layoutparams，但是我收到一条错误，指出GridView.LayoutParams是未解析的引用。以下是该类的完整代码：
class ImageAdapter(val context: Context) : BaseAdapter() {
// references to our images
val items: IntArray = intArrayOf(R.drawable.cat, R.drawable.daft_punk, R.drawable.gun, R.drawable.harvestors, R.drawable.intel, R.drawable.maserati, R.drawable.porsche, R.drawable.serveroom, R.drawable.spiderman, R.drawable.watch_dog)
override fun getItem(p0: Int): Any {
TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
}
override fun getItemId(p0: Int): Long {
return 0
}
override fun getCount(): Int {
return items.size
}
// create a new ImageView for each item referenced by the Adapter
override fun getView(p0: Int, p1: View?, p2: ViewGroup?): View {
var imageView: ImageView
if (p1 == null) {
// if it's not recycled, initialize some attributes
imageView= ImageView(context)
imageView.layoutParams= GridView.LayoutParams(85,85)
imageView.scaleType = ImageView.ScaleType.CENTER_CROP
imageView.setPadding(8, 8, 8, 8)
} else {
imageView=p1 as ImageView
}
imageView.setImageResource(items[p0])
return imageView
}
}
错误位于getView行的imageView.layoutParams=GridView.LayoutParams(85,85)方法中。 LayoutParams为红色，表示错误，当我将鼠标悬停在其上时，我收到消息：
未解决的参考：LayoutParams
如何成功设置这些LayoutParams？因为没有它们GridView中的图像显示在它们的全高，我需要一个小图像，就像图库应用程序在我们的手机中显示它们一样。
当我用imageView.layoutParams=GridView.LayoutParams(85,85)替换imageView.layoutParams=AbsListView.LayoutParams(85,85)时，我收到javaOutOfMemory错误。
以下是完整堆栈跟踪：
08-16 06:58:11.412 4543-4543/gallerie.classmite.com.imageviewer E/dalvikvm-heap: Out of memory on a 18662416-byte allocation.
08-16 06:58:11.431 4543-4543/gallerie.classmite.com.imageviewer E/AndroidRuntime: FATAL EXCEPTION: main
Process: gallerie.classmite.com.imageviewer, PID: 4543 java.lang.OutOfMemoryError
at android.graphics.BitmapFactory.nativeDecodeAsset(Native Method)
at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:609
at android.graphics.BitmapFactory.decodeResourceStream(BitmapFactory.java:444)
at android.graphics.drawable.Drawable.createFromResourceStream(Drawable.java:840)
at android.content.res.Resources.loadDrawable(Resources.java:2166)
at android.content.res.Resources.getDrawable(Resources.java:710)
at android.widget.ImageView.resolveUri(ImageView.java:638)
at android.widget.ImageView.setImageResource(ImageView.java:367)
at gallerie.classmite.com.imageviewer.ImageAdapter.getView(ImageAdapter.kt:32)
at android.widget.AbsListView.obtainView(AbsListView.java:2372)
at android.widget.GridView.makeAndAddView(GridView.java:1345)
at android.widget.GridView.makeRow(GridView.java:345)
at android.widget.GridView.fillDown(GridView.java:287)
at android.widget.GridView.fillFromTop(GridView.java:421)
at android.widget.GridView.layoutChildren(GridView.java:1233)
at android.widget.AbsListView.onLayout(AbsListView.java:2166)
at android.view.View.layout(View.java:15127)
at android.view.ViewGroup.layout(ViewGroup.java:4862)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1888)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1742)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1651)
at android.view.View.layout(View.java:15127)
at android.view.ViewGroup.layout(ViewGroup.java:4862)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:515)
at android.widget.FrameLayout.onLayout(FrameLayout.java:450)
at android.view.View.layout(View.java:15127)
at android.view.ViewGroup.layout(ViewGroup.java:4862)
at com.android.internal.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:374)
at android.view.View.layout(View.java:15127)
at android.view.ViewGroup.layout(ViewGroup.java:4862)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:515)
at android.widget.FrameLayout.onLayout(FrameLayout.java:450)
at android.view.View.layout(View.java:15127)
at android.view.ViewGroup.layout(ViewGroup.java:4862)
at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2315)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2021)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1189)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6221)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:788)
at android.view.Choreographer.doCallbacks(Choreographer.java:591)
at android.view.Choreographer.doFrame(Choreographer.java:560)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:774)
at android.os.Handler.handleCallback(Handler.java:808)
at android.os.Handler.dispatchMessage(Handler.java:103)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5315)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:829)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:645)
at dalvik.system.NativeStart.main(Native Method)
只有当我在手机中运行应用程序时才会出现错误，但是当我在模拟器中运行应用程序时，在我上面进行替换后它会完美运行。
答案 0 :(得分：3)
你可以试试这个：
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imageView.layoutParams = AbsListView.LayoutParams(85, 85)
使用 AbsListView.LayoutParams＆＃39; GridView。
由于静态成员可以由子类in Java继承。致电LayoutParams时，实际上是GridView.LayoutParams。但是，在Kotlin中，你不能以同样的方式去做。在子类之外，您只能使用超类的名称引用超类的伴随对象的成员。
AbsListView.LayoutParams错误表示您正在将大图片加载到OutOfMemory。为了防止这种情况，您必须在显示图像之前缩小图像，参考此tutorial。您还可以使用某些图像加载框架（例如Glide）来显示图像。
建议阅读：Strange out of memory issue while loading an image to a Bitmap object
答案 1 :(得分：0)
不要像你那样设置布局参数
正确的方法是 imageParams =（GridView.LayoutParams）imageView.getLayoutParams（）;
在上面的行“GridView”应该替换为imageView的父视图
快乐编码.. :)