【发布时间】：2017-08-16 01:25:00
【问题描述】：
我是 android 新手，我在 the official android site 遇到了这个关于如何创建 GridView 图像的教程。我使用 kotlin 作为首选语言。在扩展 BaseAdapter 的适配器类中，我试图按照教程中的说明设置 imageview 布局参数，但我收到一条错误消息，指出 GridView.LayoutParams 是未解析的引用。这是该类的完整代码：
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
}
}
错误在于imageView.layoutParams=GridView.LayoutParams(85,85) 行的getView 方法。 LayoutParams 是红色的，表示错误，当我将鼠标悬停在上面时，我会收到消息：
未解决的参考：LayoutParams
如何成功设置这些LayoutParams？因为没有它们，GridView 中的图像会以全高显示，我需要一个小图像，就像画廊应用在我们的手机中显示它们一样。
后续问题：
当我将 imageView.layoutParams=GridView.LayoutParams(85,85) 替换为 imageView.layoutParams=AbsListView.LayoutParams(85,85) 时，我收到 javaOutOfMemory 错误。
以下是完整的堆栈跟踪：
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)
这个错误只发生在我在手机中运行应用程序时，但是当我在模拟器中运行应用程序时，在我进行上述替换后它可以正常工作。
【问题讨论】：
-
您在 imageView 中加载的图像尺寸是多少？
-
最大的几乎是 2MB，大多数小于 1MB...当我加载许多较小的图像时说总共超过 15 个，我得到同样的错误
-
尝试使用 Glide 库 github.com/bumptech/glide。与位图缓存和池一起实现非常容易，并且可以轻松处理您的用例。
-
好的..一定会试一试的..
标签： android gridview out-of-memory kotlin