getView() 从未调用过 baseadapter getcount 已调用
getView() never called baseadapter getcount called
我正在开发一个 gridview 来显示 JSON 图像。我正在进入 ImageAdapter，但我没有在屏幕上收到图像，表明在获取关联视图时发生了不正确的事情。 MyArrList 是否为空？
我意识到还有其他类似我自己的帖子，但我对它们进行了深入研究，但找不到解决方案。
Logcat:
V/log﹕ getcount
08-04 11:02:33.044 22241-22241/com.example.justin.myapplication V/log﹕ getcount
08-04 11:02:33.060 22241-22241/com.example.justin.myapplication V/log﹕ getcount
08-04 11:02:33.060 22241-22241/com.example.justin.myapplication V/log﹕ getcount
08-04 11:02:33.060 22241-22241/com.example.justin.myapplication V/log﹕ getcount
08-04 11:02:33.060 22241-22241/com.example.justin.myapplication V/log﹕ getcount
08-04 11:02:33.169 22241-22241/com.example.justin.myapplication V/log﹕ getcount
08-04 11:02:33.169 22241-22241/com.example.justin.myapplication V/log﹕ getcount
08-04 11:02:33.177 22241-22241/com.example.justin.myapplication V/log﹕ getcount
08-04 11:02:33.177 22241-22241/com.example.justin.myapplication V/log﹕ getcount
08-04 09:12:44.179 6312-6315/com.example.justin.myapplication D/dalvikvm﹕ GC_CONCURRENT freed 177K, 3% free 8929K/9148K, paused 5ms+2ms, total 37ms
08-04 09:12:44.179 6312-6352/com.example.justin.myapplication D/dalvikvm﹕ WAIT_FOR_CONCURRENT_GC blocked 17ms
08-04 09:12:44.203 6312-6352/com.example.justin.myapplication D/dalvikvm﹕ GC_FOR_ALLOC freed 285K, 6% free 8941K/9452K, paused 20ms, total 20ms
08-04 09:12:44.289 6312-6315/com.example.justin.myapplication D/dalvikvm﹕ GC_CONCURRENT freed 241K, 3% free 9198K/9464K, paused 1ms+5ms, total 24ms
08-04 09:12:44.359 6312-6352/com.example.justin.myapplication D/dalvikvm﹕ GC_FOR_ALLOC freed 288K, 5% free 9159K/9612K, paused 13ms, total 13ms
08-04 09:12:44.359 6312-6352/com.example.justin.myapplication I/dalvikvm-heap﹕ Grow heap (frag case) to 9.093MB for 130826-byte allocation
08-04 09:12:44.375 6312-6321/com.example.justin.myapplication D/dalvikvm﹕ GC_FOR_ALLOC freed 85K, 6% free 9202K/9740K, paused 14ms, total 14ms
08-04 09:12:44.375 6312-6352/com.example.justin.myapplication V/data﹕ {"car_images":[{"CarManufacturerImage":"bmw.png","...}
08-04 09:12:45.875 6312-6315/com.example.justin.myapplication D/dalvikvm﹕ GC_CONCURRENT freed 269K, 5% free 9299K/9740K, paused 2ms+3ms, total 23ms
08-04 09:12:46.047 6312-6352/com.example.justin.myapplication V/Bitmap﹕ CarImageLink
08-04 09:12:46.047 6312-6352/com.example.justin.myapplication V/MyArrList﹕ [{CarImageLink=android.graphics.drawable.BitmapDrawable@41b5b7d8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b34d28}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41ba3d10}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b5eb98}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b3c7e8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b9c828}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bb96a0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b54f48}]
08-04 09:12:46.054 6312-6352/com.example.justin.myapplication V/return0﹕ [{CarImageLink=android.graphics.drawable.BitmapDrawable@41b5b7d8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b34d28}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41ba3d10}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b5eb98}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b3c7e8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b9c828}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bb96a0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b54f48}]
08-04 09:12:46.054 6312-6352/com.example.justin.myapplication V/getJSONObject(i)﹕ {"CarManufacturerImage":"bmw.png",....}
08-04 09:12:46.265 6312-6352/com.example.justin.myapplication V/Bitmap﹕ CarImageLink
08-04 09:12:46.265 6312-6352/com.example.justin.myapplication V/MyArrList﹕ [{CarImageLink=android.graphics.drawable.BitmapDrawable@41b5b7d8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b34d28}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41ba3d10}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b5eb98}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b3c7e8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b9c828}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bb96a0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b54f48}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b86380}]
08-04 09:12:46.273 6312-6352/com.example.justin.myapplication V/return0﹕ [{CarImageLink=android.graphics.drawable.BitmapDrawable@41b5b7d8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b34d28}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41ba3d10}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b5eb98}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b3c7e8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b9c828}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bb96a0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b54f48}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b86380}]
08-04 09:12:46.273 6312-6352/com.example.justin.myapplication V/getJSONObject(i)﹕ {"CarManufacturerImage":"bmw.png",....}
08-04 09:12:46.468 6312-6352/com.example.justin.myapplication V/Bitmap﹕ CarImageLink
08-04 09:12:46.468 6312-6352/com.example.justin.myapplication V/MyArrList﹕ [{CarImageLink=android.graphics.drawable.BitmapDrawable@41b5b7d8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b34d28}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41ba3d10}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b5eb98}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b3c7e8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b9c828}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bb96a0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b54f48}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b86380}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b9c420}]
08-04 09:12:46.468 6312-6352/com.example.justin.myapplication V/return0﹕ [{CarImageLink=android.graphics.drawable.BitmapDrawable@41b5b7d8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b34d28}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41ba3d10}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b5eb98}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b3c7e8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b9c828}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bb96a0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b54f48}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b86380}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b9c420}]
08-04 09:12:46.476 6312-6352/com.example.justin.myapplication V/getJSONObject(i)﹕ {"CarManufacturerImage":"bmw.png",....}
08-04 09:12:46.679 6312-6352/com.example.justin.myapplication V/Bitmap﹕ CarImageLink
08-04 09:12:46.687 6312-6352/com.example.justin.myapplication V/MyArrList﹕ [{CarImageLink=android.graphics.drawable.BitmapDrawable@41b5b7d8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b34d28}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41ba3d10}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b5eb98}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b3c7e8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b9c828}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bb96a0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b54f48}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b86380}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b9c420}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bdedf8}]
08-04 09:12:46.695 6312-6352/com.example.justin.myapplication V/return0﹕ [{CarImageLink=android.graphics.drawable.BitmapDrawable@41b5b7d8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b34d28}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41ba3d10}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b5eb98}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b3c7e8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b9c828}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bb96a0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b54f48}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b86380}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b9c420}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bdedf8}]
08-04 09:12:46.695 6312-6352/com.example.justin.myapplication V/getJSONObject(i)﹕ {"CarManufacturerImage":"bmw.png",....}
08-04 09:12:46.711 6312-6315/com.example.justin.myapplication D/dalvikvm﹕ GC_CONCURRENT freed 315K, 4% free 9420K/9812K, paused 7ms+2ms, total 31ms
08-04 09:12:46.906 6312-6352/com.example.justin.myapplication V/Bitmap﹕ CarImageLink
08-04 09:12:46.906 6312-6352/com.example.justin.myapplication V/MyArrList﹕ [{CarImageLink=android.graphics.drawable.BitmapDrawable@41b5b7d8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b34d28}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41ba3d10}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b5eb98}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b3c7e8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b9c828}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bb96a0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b54f48}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b86380}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b9c420}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bdedf8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b50150}]
08-04 09:12:46.914 6312-6352/com.example.justin.myapplication V/return0﹕ [{CarImageLink=android.graphics.drawable.BitmapDrawable@41b5b7d8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b34d28}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41ba3d10}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b5eb98}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b3c7e8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b9c828}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bb96a0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b54f48}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b86380}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b9c420}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bdedf8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b50150}]
08-04 09:12:46.914 6312-6352/com.example.justin.myapplication V/getJSONObject(i)﹕ {"CarManufacturerImage":"bmw.png",....}
08-04 09:12:47.117 6312-6352/com.example.justin.myapplication V/Bitmap﹕ CarImageLink
08-04 09:12:47.117 6312-6352/com.example.justin.myapplication V/MyArrList﹕ [{CarImageLink=android.graphics.drawable.BitmapDrawable@41b5b7d8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b34d28}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41ba3d10}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b5eb98}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b3c7e8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b9c828}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bb96a0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b54f48}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b86380}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b9c420}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bdedf8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b50150}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41baa090}]
08-04 11:02:37.255 22241-22279/com.example.justin.myapplication V/return0﹕ [{CarImageLink=android.graphics.drawable.BitmapDrawable@41b86600}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b34e38}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41ba3c28}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b59b68}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b0b0f8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b9bee0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bb94a8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b54d10}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b37458}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b411b8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bdec58}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b4ff18}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bc37c8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bcfbd8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41c05140}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b19c30}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bf4ce0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bcf7a0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b4b120}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b2d638}]
08-04 11:34:59.794 4563-4563/com.example.justin.myapplication V/return3﹕ [{CarImageLink=android.graphics.drawable.BitmapDrawable@41ace870}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b35768}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41ba4298}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b72cd0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b3d2e8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b842e8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bb99c0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b642e8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41ad6a60}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b8b8c0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bdf338}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b5f4f0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bc3608}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41ba9308}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41be9138}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b4bcb0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bab378}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bb0408}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b5a6f8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bec410}]
08-04 11:34:59.794 4563-4563/com.example.justin.myapplication V/value﹕ value
08-04 11:34:59.794 4563-4563/com.example.justin.myapplication V/value1﹕ value1
08-04 11:34:59.794 4563-4563/com.example.justin.myapplication V/log﹕ getcount
08-04 11:34:59.794 4563-4563/com.example.justin.myapplication V/log﹕ getcount
08-04 11:34:59.794 4563-4563/com.example.justin.myapplication V/return2﹕ com.example.justin.myapplication.JSONImageViewer$ImageAdapter@41afd290
08-04 11:34:59.794 4563-4563/com.example.justin.myapplication V/return2.1﹕ [{CarImageLink=android.graphics.drawable.BitmapDrawable@41ace870}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b35768}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41ba4298}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b72cd0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b3d2e8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b842e8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bb99c0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b642e8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41ad6a60}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b8b8c0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bdf338}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b5f4f0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bc3608}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41ba9308}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41be9138}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b4bcb0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bab378}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bb0408}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b5a6f8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bec410}]
08-04 11:34:59.810 4563-4563/com.example.justin.myapplication V/log﹕ getcount
08-04 11:34:59.810 4563-4563/com.example.justin.myapplication V/v﹕ convertView inflating
08-04 11:34:59.810 4563-4563/com.example.justin.myapplication V/convertview﹕ android.widget.RelativeLayout{41baedb8 V.E..... ......I. 0,0-0,0}
08-04 11:34:59.810 4563-4563/com.example.justin.myapplication D/AndroidRuntime﹕ Shutting down VM
08-04 11:34:59.810 4563-4563/com.example.justin.myapplication W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0x41266930)
08-04 11:34:59.825 4563-4563/com.example.justin.myapplication E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.NullPointerException
at com.example.justin.myapplication.JSONImageViewer$ImageAdapter.getView(JSONImageViewer.java:238)
at android.widget.AbsListView.obtainView(AbsListView.java:2159)
at android.widget.GridView.onMeasure(GridView.java:1040)
at android.view.View.measure(View.java:15518)
at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:681)
at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461)
at android.view.View.measure(View.java:15518)
at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:681)
at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461)
at android.view.View.measure(View.java:15518)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at android.view.View.measure(View.java:15518)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:847)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
at android.view.View.measure(View.java:15518)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2176)
at android.view.View.measure(View.java:15518)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1874)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1089)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1265)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
at android.view.Choreographer.doCallbacks(Choreographer.java:562)
at android.view.Choreographer.doFrame(Choreographer.java:532)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
at android.os.Handler.handleCallback(Handler.java:725)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5041)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)
08-04 11:34:59.856 4563-4567/com.example.justin.myapplication D/dalvikvm﹕ GC_CONCURRENT freed 650K, 8% free 9424K/10140K, paused 2ms+3ms, total 32ms
Activity_column.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<ImageView
android:id="@+id/ColPhoto"
android:layout_width="50dp"
android:layout_height="50dp"
/>
</RelativeLayout>
关于为什么我无法通过 getView() 接收图像但可以获取 getCount() 的值的任何 suggestions/insight 表示赞赏。谢谢。
您需要致电
protected String onPostExecute()
{
// change your data set here then call
imageAdapter.notifyDataSetChanged();
}
在 onPostExecute() 中而不是在 OnProgressUpdated() 中，您还必须在修改数据集后调用它
编辑
onProgressUpdate 通常用于更新 ui（即进度条）。它会在你每次调用时被调用
protected String doInBackground()
{
// other code ommited
String progress = "test";
publishProgress(progress);
}
您没有这样做，因此它永远不会更新数据集。
尝试将您的代码从 OnProgressUpdated 移至 onPostExecute()；
在您的 onCreate() 方法中，在您创建适配器的行中将 getApplicationContext() 更改为 this 并删除 notifyDataSetChanged().
并从 doInBackground() 中删除 MyArrList 副本
尝试按如下方式更改您的任务：
class LoadContentFromServer extends AsyncTask<Object, Integer, Object> {
@Override
protected Object doInBackground(Object... params) {
String url = "http://..no looking..";
JSONObject data;
try {
data = new JSONObject(getJSONUrl(url));
Log.v("data", data.toString());
JSONArray dataArray = data.getJSONArray("car_images");
/*
* TotalRows = Show for total rows
* TotalPage = Show for total page
*/
int displayPerPage = 9; // Per Page
int TotalRows = data.length();
int indexRowStart = ((displayPerPage * currentPage) - displayPerPage);
if (TotalRows <= displayPerPage) {
TotalPage = 1;
} else if ((TotalRows % displayPerPage) == 0) {
TotalPage = (TotalRows / displayPerPage);
} else {
TotalPage = (TotalRows / displayPerPage) + 1;
TotalPage = (int) TotalPage;
}
int indexRowEnd = displayPerPage * currentPage;
if (indexRowEnd > TotalRows) {
indexRowEnd = TotalRows;
}
for (int i = 0; i < dataArray.length(); i++) {
//HashMap<String, Object> map = new HashMap<String, Object>();
JSONObject c = dataArray.getJSONObject(i);
Log.v("getJSONObject(i)", dataArray.getJSONObject(i).toString());
// Thumbnail Get ImageBitmap To Object
HashMap<String, Object> map = new HashMap<String, Object>();
Bitmap bitmap = loadBitmap(c.getString(TAG_IMG));
Drawable d = new BitmapDrawable(getResources(), bitmap);
map.put(TAG_IMG, d);
Log.v("Bitmap", TAG_IMG);
MyArrList.add(map);
Log.v("MyArrList", MyArrList.toString());
Log.v("return0", MyArrList.toString());
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Object result) {
Log.v("return3", MyArrList.toString());
// Disabled Button Next
if(currentPage >= TotalPage) {
btnNext.setEnabled(false);
}
else {
btnNext.setEnabled(true);
}
// Disabled Button Previous
if(currentPage <= 1) {
btnPre.setEnabled(false);
}
else {
btnPre.setEnabled(true);
}
setProgressBarIndeterminateVisibility(false);
imageAdapter.addAll(MyArrList);
imageAdapter.notifyDataSetChanged();
Log.v("return2", imageAdapter.toString());
Log.v("return2.1", MyArrList.toString());
}
}
和适配器：
class ImageAdapter extends BaseAdapter {
private Context mContext;
private ArrayList<HashMap<String, Object>> array;
public ImageAdapter(Context context) {
mContext = context;
array = new ArrayList<>();
}
@Override
public int getCount() {
Log.v("log", "getcount");
return array.size();
}
public Object getItem(int position) {
return array.get(position);
}
public long getItemId(int position) {
return position;
}
public void addAll(ArrayList<HashMap<String, Object>> list) {
array.clear();
array.addAll(list);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
//If convertView is null create a new view, else use convert view
if(convertView==null) {
Log.v("v", "convertView inflating");
convertView = ((LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE)).inflate
(R.layout.activity_column, null);
}
Log.v("convertview", convertView.toString());
ImageView iv = (ImageView) convertView.findViewById(R.id.ColPhoto);
iv.setImageBitmap((Bitmap) array.get(position).get(TAG_IMG));
iv.setVisibility(ImageView.VISIBLE);
return v;
}
}
我正在开发一个 gridview 来显示 JSON 图像。我正在进入 ImageAdapter，但我没有在屏幕上收到图像，表明在获取关联视图时发生了不正确的事情。 MyArrList 是否为空？
我意识到还有其他类似我自己的帖子，但我对它们进行了深入研究，但找不到解决方案。
Logcat:
V/log﹕ getcount
08-04 11:02:33.044 22241-22241/com.example.justin.myapplication V/log﹕ getcount
08-04 11:02:33.060 22241-22241/com.example.justin.myapplication V/log﹕ getcount
08-04 11:02:33.060 22241-22241/com.example.justin.myapplication V/log﹕ getcount
08-04 11:02:33.060 22241-22241/com.example.justin.myapplication V/log﹕ getcount
08-04 11:02:33.060 22241-22241/com.example.justin.myapplication V/log﹕ getcount
08-04 11:02:33.169 22241-22241/com.example.justin.myapplication V/log﹕ getcount
08-04 11:02:33.169 22241-22241/com.example.justin.myapplication V/log﹕ getcount
08-04 11:02:33.177 22241-22241/com.example.justin.myapplication V/log﹕ getcount
08-04 11:02:33.177 22241-22241/com.example.justin.myapplication V/log﹕ getcount
08-04 09:12:44.179 6312-6315/com.example.justin.myapplication D/dalvikvm﹕ GC_CONCURRENT freed 177K, 3% free 8929K/9148K, paused 5ms+2ms, total 37ms
08-04 09:12:44.179 6312-6352/com.example.justin.myapplication D/dalvikvm﹕ WAIT_FOR_CONCURRENT_GC blocked 17ms
08-04 09:12:44.203 6312-6352/com.example.justin.myapplication D/dalvikvm﹕ GC_FOR_ALLOC freed 285K, 6% free 8941K/9452K, paused 20ms, total 20ms
08-04 09:12:44.289 6312-6315/com.example.justin.myapplication D/dalvikvm﹕ GC_CONCURRENT freed 241K, 3% free 9198K/9464K, paused 1ms+5ms, total 24ms
08-04 09:12:44.359 6312-6352/com.example.justin.myapplication D/dalvikvm﹕ GC_FOR_ALLOC freed 288K, 5% free 9159K/9612K, paused 13ms, total 13ms
08-04 09:12:44.359 6312-6352/com.example.justin.myapplication I/dalvikvm-heap﹕ Grow heap (frag case) to 9.093MB for 130826-byte allocation
08-04 09:12:44.375 6312-6321/com.example.justin.myapplication D/dalvikvm﹕ GC_FOR_ALLOC freed 85K, 6% free 9202K/9740K, paused 14ms, total 14ms
08-04 09:12:44.375 6312-6352/com.example.justin.myapplication V/data﹕ {"car_images":[{"CarManufacturerImage":"bmw.png","...}
08-04 09:12:45.875 6312-6315/com.example.justin.myapplication D/dalvikvm﹕ GC_CONCURRENT freed 269K, 5% free 9299K/9740K, paused 2ms+3ms, total 23ms
08-04 09:12:46.047 6312-6352/com.example.justin.myapplication V/Bitmap﹕ CarImageLink
08-04 09:12:46.047 6312-6352/com.example.justin.myapplication V/MyArrList﹕ [{CarImageLink=android.graphics.drawable.BitmapDrawable@41b5b7d8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b34d28}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41ba3d10}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b5eb98}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b3c7e8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b9c828}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bb96a0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b54f48}]
08-04 09:12:46.054 6312-6352/com.example.justin.myapplication V/return0﹕ [{CarImageLink=android.graphics.drawable.BitmapDrawable@41b5b7d8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b34d28}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41ba3d10}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b5eb98}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b3c7e8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b9c828}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bb96a0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b54f48}]
08-04 09:12:46.054 6312-6352/com.example.justin.myapplication V/getJSONObject(i)﹕ {"CarManufacturerImage":"bmw.png",....}
08-04 09:12:46.265 6312-6352/com.example.justin.myapplication V/Bitmap﹕ CarImageLink
08-04 09:12:46.265 6312-6352/com.example.justin.myapplication V/MyArrList﹕ [{CarImageLink=android.graphics.drawable.BitmapDrawable@41b5b7d8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b34d28}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41ba3d10}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b5eb98}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b3c7e8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b9c828}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bb96a0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b54f48}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b86380}]
08-04 09:12:46.273 6312-6352/com.example.justin.myapplication V/return0﹕ [{CarImageLink=android.graphics.drawable.BitmapDrawable@41b5b7d8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b34d28}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41ba3d10}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b5eb98}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b3c7e8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b9c828}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bb96a0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b54f48}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b86380}]
08-04 09:12:46.273 6312-6352/com.example.justin.myapplication V/getJSONObject(i)﹕ {"CarManufacturerImage":"bmw.png",....}
08-04 09:12:46.468 6312-6352/com.example.justin.myapplication V/Bitmap﹕ CarImageLink
08-04 09:12:46.468 6312-6352/com.example.justin.myapplication V/MyArrList﹕ [{CarImageLink=android.graphics.drawable.BitmapDrawable@41b5b7d8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b34d28}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41ba3d10}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b5eb98}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b3c7e8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b9c828}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bb96a0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b54f48}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b86380}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b9c420}]
08-04 09:12:46.468 6312-6352/com.example.justin.myapplication V/return0﹕ [{CarImageLink=android.graphics.drawable.BitmapDrawable@41b5b7d8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b34d28}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41ba3d10}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b5eb98}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b3c7e8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b9c828}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bb96a0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b54f48}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b86380}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b9c420}]
08-04 09:12:46.476 6312-6352/com.example.justin.myapplication V/getJSONObject(i)﹕ {"CarManufacturerImage":"bmw.png",....}
08-04 09:12:46.679 6312-6352/com.example.justin.myapplication V/Bitmap﹕ CarImageLink
08-04 09:12:46.687 6312-6352/com.example.justin.myapplication V/MyArrList﹕ [{CarImageLink=android.graphics.drawable.BitmapDrawable@41b5b7d8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b34d28}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41ba3d10}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b5eb98}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b3c7e8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b9c828}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bb96a0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b54f48}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b86380}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b9c420}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bdedf8}]
08-04 09:12:46.695 6312-6352/com.example.justin.myapplication V/return0﹕ [{CarImageLink=android.graphics.drawable.BitmapDrawable@41b5b7d8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b34d28}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41ba3d10}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b5eb98}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b3c7e8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b9c828}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bb96a0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b54f48}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b86380}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b9c420}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bdedf8}]
08-04 09:12:46.695 6312-6352/com.example.justin.myapplication V/getJSONObject(i)﹕ {"CarManufacturerImage":"bmw.png",....}
08-04 09:12:46.711 6312-6315/com.example.justin.myapplication D/dalvikvm﹕ GC_CONCURRENT freed 315K, 4% free 9420K/9812K, paused 7ms+2ms, total 31ms
08-04 09:12:46.906 6312-6352/com.example.justin.myapplication V/Bitmap﹕ CarImageLink
08-04 09:12:46.906 6312-6352/com.example.justin.myapplication V/MyArrList﹕ [{CarImageLink=android.graphics.drawable.BitmapDrawable@41b5b7d8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b34d28}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41ba3d10}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b5eb98}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b3c7e8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b9c828}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bb96a0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b54f48}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b86380}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b9c420}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bdedf8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b50150}]
08-04 09:12:46.914 6312-6352/com.example.justin.myapplication V/return0﹕ [{CarImageLink=android.graphics.drawable.BitmapDrawable@41b5b7d8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b34d28}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41ba3d10}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b5eb98}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b3c7e8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b9c828}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bb96a0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b54f48}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b86380}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b9c420}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bdedf8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b50150}]
08-04 09:12:46.914 6312-6352/com.example.justin.myapplication V/getJSONObject(i)﹕ {"CarManufacturerImage":"bmw.png",....}
08-04 09:12:47.117 6312-6352/com.example.justin.myapplication V/Bitmap﹕ CarImageLink
08-04 09:12:47.117 6312-6352/com.example.justin.myapplication V/MyArrList﹕ [{CarImageLink=android.graphics.drawable.BitmapDrawable@41b5b7d8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b34d28}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41ba3d10}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b5eb98}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b3c7e8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b9c828}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bb96a0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b54f48}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b86380}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b9c420}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bdedf8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b50150}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41baa090}]
08-04 11:02:37.255 22241-22279/com.example.justin.myapplication V/return0﹕ [{CarImageLink=android.graphics.drawable.BitmapDrawable@41b86600}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b34e38}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41ba3c28}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b59b68}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b0b0f8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b9bee0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bb94a8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b54d10}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b37458}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b411b8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bdec58}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b4ff18}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bc37c8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bcfbd8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41c05140}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b19c30}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bf4ce0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bcf7a0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b4b120}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b2d638}]
08-04 11:34:59.794 4563-4563/com.example.justin.myapplication V/return3﹕ [{CarImageLink=android.graphics.drawable.BitmapDrawable@41ace870}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b35768}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41ba4298}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b72cd0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b3d2e8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b842e8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bb99c0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b642e8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41ad6a60}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b8b8c0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bdf338}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b5f4f0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bc3608}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41ba9308}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41be9138}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b4bcb0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bab378}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bb0408}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b5a6f8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bec410}]
08-04 11:34:59.794 4563-4563/com.example.justin.myapplication V/value﹕ value
08-04 11:34:59.794 4563-4563/com.example.justin.myapplication V/value1﹕ value1
08-04 11:34:59.794 4563-4563/com.example.justin.myapplication V/log﹕ getcount
08-04 11:34:59.794 4563-4563/com.example.justin.myapplication V/log﹕ getcount
08-04 11:34:59.794 4563-4563/com.example.justin.myapplication V/return2﹕ com.example.justin.myapplication.JSONImageViewer$ImageAdapter@41afd290
08-04 11:34:59.794 4563-4563/com.example.justin.myapplication V/return2.1﹕ [{CarImageLink=android.graphics.drawable.BitmapDrawable@41ace870}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b35768}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41ba4298}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b72cd0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b3d2e8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b842e8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bb99c0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b642e8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41ad6a60}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b8b8c0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bdf338}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b5f4f0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bc3608}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41ba9308}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41be9138}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b4bcb0}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bab378}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bb0408}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41b5a6f8}, {CarImageLink=android.graphics.drawable.BitmapDrawable@41bec410}]
08-04 11:34:59.810 4563-4563/com.example.justin.myapplication V/log﹕ getcount
08-04 11:34:59.810 4563-4563/com.example.justin.myapplication V/v﹕ convertView inflating
08-04 11:34:59.810 4563-4563/com.example.justin.myapplication V/convertview﹕ android.widget.RelativeLayout{41baedb8 V.E..... ......I. 0,0-0,0}
08-04 11:34:59.810 4563-4563/com.example.justin.myapplication D/AndroidRuntime﹕ Shutting down VM
08-04 11:34:59.810 4563-4563/com.example.justin.myapplication W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0x41266930)
08-04 11:34:59.825 4563-4563/com.example.justin.myapplication E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.NullPointerException
at com.example.justin.myapplication.JSONImageViewer$ImageAdapter.getView(JSONImageViewer.java:238)
at android.widget.AbsListView.obtainView(AbsListView.java:2159)
at android.widget.GridView.onMeasure(GridView.java:1040)
at android.view.View.measure(View.java:15518)
at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:681)
at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461)
at android.view.View.measure(View.java:15518)
at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:681)
at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461)
at android.view.View.measure(View.java:15518)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at android.view.View.measure(View.java:15518)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:847)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
at android.view.View.measure(View.java:15518)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2176)
at android.view.View.measure(View.java:15518)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1874)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1089)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1265)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
at android.view.Choreographer.doCallbacks(Choreographer.java:562)
at android.view.Choreographer.doFrame(Choreographer.java:532)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
at android.os.Handler.handleCallback(Handler.java:725)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5041)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)
08-04 11:34:59.856 4563-4567/com.example.justin.myapplication D/dalvikvm﹕ GC_CONCURRENT freed 650K, 8% free 9424K/10140K, paused 2ms+3ms, total 32ms
Activity_column.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<ImageView
android:id="@+id/ColPhoto"
android:layout_width="50dp"
android:layout_height="50dp"
/>
</RelativeLayout>
关于为什么我无法通过 getView() 接收图像但可以获取 getCount() 的值的任何 suggestions/insight 表示赞赏。谢谢。
您需要致电
protected String onPostExecute()
{
// change your data set here then call
imageAdapter.notifyDataSetChanged();
}
在 onPostExecute() 中而不是在 OnProgressUpdated() 中，您还必须在修改数据集后调用它
编辑 onProgressUpdate 通常用于更新 ui（即进度条）。它会在你每次调用时被调用
protected String doInBackground()
{
// other code ommited
String progress = "test";
publishProgress(progress);
}
您没有这样做，因此它永远不会更新数据集。
尝试将您的代码从 OnProgressUpdated 移至 onPostExecute()；
在您的 onCreate() 方法中，在您创建适配器的行中将 getApplicationContext() 更改为 this 并删除 notifyDataSetChanged().
并从 doInBackground() 中删除 MyArrList 副本
尝试按如下方式更改您的任务：
class LoadContentFromServer extends AsyncTask<Object, Integer, Object> {
@Override
protected Object doInBackground(Object... params) {
String url = "http://..no looking..";
JSONObject data;
try {
data = new JSONObject(getJSONUrl(url));
Log.v("data", data.toString());
JSONArray dataArray = data.getJSONArray("car_images");
/*
* TotalRows = Show for total rows
* TotalPage = Show for total page
*/
int displayPerPage = 9; // Per Page
int TotalRows = data.length();
int indexRowStart = ((displayPerPage * currentPage) - displayPerPage);
if (TotalRows <= displayPerPage) {
TotalPage = 1;
} else if ((TotalRows % displayPerPage) == 0) {
TotalPage = (TotalRows / displayPerPage);
} else {
TotalPage = (TotalRows / displayPerPage) + 1;
TotalPage = (int) TotalPage;
}
int indexRowEnd = displayPerPage * currentPage;
if (indexRowEnd > TotalRows) {
indexRowEnd = TotalRows;
}
for (int i = 0; i < dataArray.length(); i++) {
//HashMap<String, Object> map = new HashMap<String, Object>();
JSONObject c = dataArray.getJSONObject(i);
Log.v("getJSONObject(i)", dataArray.getJSONObject(i).toString());
// Thumbnail Get ImageBitmap To Object
HashMap<String, Object> map = new HashMap<String, Object>();
Bitmap bitmap = loadBitmap(c.getString(TAG_IMG));
Drawable d = new BitmapDrawable(getResources(), bitmap);
map.put(TAG_IMG, d);
Log.v("Bitmap", TAG_IMG);
MyArrList.add(map);
Log.v("MyArrList", MyArrList.toString());
Log.v("return0", MyArrList.toString());
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Object result) {
Log.v("return3", MyArrList.toString());
// Disabled Button Next
if(currentPage >= TotalPage) {
btnNext.setEnabled(false);
}
else {
btnNext.setEnabled(true);
}
// Disabled Button Previous
if(currentPage <= 1) {
btnPre.setEnabled(false);
}
else {
btnPre.setEnabled(true);
}
setProgressBarIndeterminateVisibility(false);
imageAdapter.addAll(MyArrList);
imageAdapter.notifyDataSetChanged();
Log.v("return2", imageAdapter.toString());
Log.v("return2.1", MyArrList.toString());
}
}
和适配器：
class ImageAdapter extends BaseAdapter {
private Context mContext;
private ArrayList<HashMap<String, Object>> array;
public ImageAdapter(Context context) {
mContext = context;
array = new ArrayList<>();
}
@Override
public int getCount() {
Log.v("log", "getcount");
return array.size();
}
public Object getItem(int position) {
return array.get(position);
}
public long getItemId(int position) {
return position;
}
public void addAll(ArrayList<HashMap<String, Object>> list) {
array.clear();
array.addAll(list);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
//If convertView is null create a new view, else use convert view
if(convertView==null) {
Log.v("v", "convertView inflating");
convertView = ((LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE)).inflate
(R.layout.activity_column, null);
}
Log.v("convertview", convertView.toString());
ImageView iv = (ImageView) convertView.findViewById(R.id.ColPhoto);
iv.setImageBitmap((Bitmap) array.get(position).get(TAG_IMG));
iv.setVisibility(ImageView.VISIBLE);
return v;
}
}