Android 从服务器获取图像到网格视图，获取java.lang.NullPointerException
我试图从服务器获取图像到网格视图，但每当我运行我的应用程序时，由于java.lang.NullPointerException，应用程序都会停止 错误位于：app.tabsample.GalleryActivity$ImageAdapter.getCount（GalleryActivity.java:170） 错误行：返回MyArr.size（）Android 从服务器获取图像到网格视图，获取java.lang.NullPointerException,android,json,android-gridview,Android,Json,Android Gridview,我试图从服务器获取图像到网格视图，但每当我运行我的应用程序时，由于java.lang.NullPointerException，应用程序都会停止 错误位于：app.tabsample.GalleryActivity$ImageAdapter.getCount（GalleryActivity.java:170） 错误行：返回MyArr.size（） public int getCount() { // Error line return MyArr.
public int getCount() {
// Error line
return MyArr.size();
}
06-20 05:15:23.298: D/dalvikvm(833): GC_CONCURRENT freed 302K, 7% free 5823K/6248K, paused 71ms+24ms, total 162ms
06-20 05:15:23.418: I/Choreographer(833): Skipped 78 frames! The application may be doing too much work on its main thread.
06-20 05:15:23.678: I/Choreographer(833): Skipped 45 frames! The application may be doing too much work on its main thread.
06-20 05:15:24.248: W/System.err(833): org.json.JSONException: Unterminated object at character 111 of [{"ImageID":"1","ImageName":"Item1","ImagePath_Thumbnail":"http://www.littleindia.ca/images/menu/fmenu01.jpg,"ImagePath_FullPhoto":"http://www.littleindia.ca/images/menu/fmenu01.jpg"},{"ImageID":"2","ImageName":"Item2","ImagePath_Thumbnail":"http://www.littleindia.ca/images/menu/fmenu02.jpg","ImagePath_FullPhoto":"http://www.littleindia.ca/images/menu/fmenu02.jpg"},{"ImageID":"3","ImageName":"Item3","ImagePath_Thumbnail":"http://www.littleindia.ca/images/menu/fmenu03.jpg","ImagePath_FullPhoto":"http://www.littleindia.ca/images/menu/fmenu03.jpg"},{"ImageID":"4","ImageName":"Item4","ImagePath_Thumbnail":"http://www.littleindia.ca/images/menu/fmenu04.jpg","ImagePath_FullPhoto":"http://www.littleindia.ca/images/menu/fmenu04.jpg"}]
06-20 05:15:24.248: W/System.err(833): at org.json.JSONTokener.syntaxError(JSONTokener.java:450)
06-20 05:15:24.329: W/System.err(833): at org.json.JSONTokener.readObject(JSONTokener.java:394)
06-20 05:15:24.348: W/System.err(833): at org.json.JSONTokener.nextValue(JSONTokener.java:100)
06-20 05:15:24.359: W/System.err(833): at org.json.JSONTokener.readArray(JSONTokener.java:430)
06-20 05:15:24.410: W/System.err(833): at org.json.JSONTokener.nextValue(JSONTokener.java:103)
06-20 05:15:24.410: W/System.err(833): at org.json.JSONArray.<init>(JSONArray.java:87)
06-20 05:15:24.418: W/System.err(833): at org.json.JSONArray.<init>(JSONArray.java:103)
06-20 05:15:24.418: W/System.err(833): at app.tabsample.GalleryActivity$DownloadJSONFileAsync.doInBackground(GalleryActivity.java:230)
06-20 05:15:24.418: W/System.err(833): at app.tabsample.GalleryActivity$DownloadJSONFileAsync.doInBackground(GalleryActivity.java:1)
06-20 05:15:24.418: W/System.err(833): at android.os.AsyncTask$2.call(AsyncTask.java:287)
06-20 05:15:24.468: W/System.err(833): at java.util.concurrent.FutureTask.run(FutureTask.java:234)
06-20 05:15:24.479: W/System.err(833): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
06-20 05:15:24.479: W/System.err(833): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
06-20 05:15:24.479: W/System.err(833): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
06-20 05:15:24.489: W/System.err(833): at java.lang.Thread.run(Thread.java:856)
06-20 05:15:24.498: D/AndroidRuntime(833): Shutting down VM
06-20 05:15:24.498: W/dalvikvm(833): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
06-20 05:15:24.530: E/AndroidRuntime(833): FATAL EXCEPTION: main
06-20 05:15:24.530: E/AndroidRuntime(833): java.lang.NullPointerException
06-20 05:15:24.530: E/AndroidRuntime(833): at app.tabsample.GalleryActivity$ImageAdapter.getCount(GalleryActivity.java:170)
06-20 05:15:24.530: E/AndroidRuntime(833): at android.widget.GridView.setAdapter(GridView.java:182)
06-20 05:15:24.530: E/AndroidRuntime(833): at app.tabsample.GalleryActivity.ShowAllContent(GalleryActivity.java:143)
06-20 05:15:24.530: E/AndroidRuntime(833): at app.tabsample.GalleryActivity$DownloadJSONFileAsync.onPostExecute(GalleryActivity.java:256)
06-20 05:15:24.530: E/AndroidRuntime(833): at app.tabsample.GalleryActivity$DownloadJSONFileAsync.onPostExecute(GalleryActivity.java:1)
06-20 05:15:24.530: E/AndroidRuntime(833): at android.os.AsyncTask.finish(AsyncTask.java:631)
06-20 05:15:24.530: E/AndroidRuntime(833): at android.os.AsyncTask.access$600(AsyncTask.java:177)
06-20 05:15:24.530: E/AndroidRuntime(833): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644)
06-20 05:15:24.530: E/AndroidRuntime(833): at android.os.Handler.dispatchMessage(Handler.java:99)
06-20 05:15:24.530: E/AndroidRuntime(833): at android.os.Looper.loop(Looper.java:137)
06-20 05:15:24.530: E/AndroidRuntime(833): at android.app.ActivityThread.main(ActivityThread.java:5041)
06-20 05:15:24.530: E/AndroidRuntime(833): at java.lang.reflect.Method.invokeNative(Native Method)
06-20 05:15:24.530: E/AndroidRuntime(833): at java.lang.reflect.Method.invoke(Method.java:511)
06-20 05:15:24.530: E/AndroidRuntime(833): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
06-20 05:15:24.530: E/AndroidRuntime(833): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
06-20 05:15:24.530: E/AndroidRuntime(833): at dalvik.system.NativeStart.main(Native Method)
06-20 05:15:27.409: I/Process(833): Sending signal. PID: 833 SIG: 9
public class ImageAdapter extends BaseAdapter
{
private Context context;
private ArrayList<HashMap<String, Object>> MyArr = new ArrayList<HashMap<String, Object>>();
public ImageAdapter(Context c, ArrayList<HashMap<String, Object>> myArrList)
{
// TODO Auto-generated method stub
context = c;
MyArr = myArrList;
}
public int getCount() {
// TODO Auto-generated method stub
return MyArr.size();
}
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (convertView == null) {
convertView = inflater.inflate(R.layout.activity_gallery_column, null);
}
// ColPhoto
ImageView imageView = (ImageView) convertView.findViewById(R.id.ColPhoto);
imageView.getLayoutParams().height = 80;
imageView.getLayoutParams().width = 80;
imageView.setPadding(10, 10, 10, 10);
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
try
{
imageView.setImageBitmap((Bitmap)MyArr.get(position).get("ImageThumBitmap"));
} catch (Exception e) {
// When Error
imageView.setImageResource(android.R.drawable.ic_menu_report_image);
}
// ColID
TextView txtID = (TextView) convertView.findViewById(R.id.ColID);
txtID.setPadding(5, 0, 0, 0);
txtID.setText("ID : " + MyArr.get(position).get("ImageID").toString());
// ColName
TextView txtName = (TextView) convertView.findViewById(R.id.ColName);
txtName.setPadding(5, 0, 0, 0);
txtName.setText("Name : " + MyArr.get(position).get("ImageName").toString());
return convertView;
}
}
06-20 05:15:23.298:D/dalvikvm（833）：GC_并发释放302K，7%释放5823K/6248K，暂停71ms+24ms，总计162ms
06-20 05:15:23.418:I/编舞（833）：跳过78帧！应用程序可能在其主线程上做了太多工作。
06-20 05:15:23.678:I/编舞（833）：跳过45帧！应用程序可能在其主线程上做了太多工作。
06-20 05:15:24.248:W/System.err（833）：org.json.JSONException:[{“ImageID”：“1”，“ImageName”：“Item1”，“ImagePath_缩略图”：“第111个字符处的未终止对象”http://www.littleindia.ca/images/menu/fmenu01.jpg，“ImagePath_FullPhoto”：http://www.littleindia.ca/images/menu/fmenu01.jpg}，{“ImageID”：“2”，“ImageName”：“Item2”，“ImagePath_缩略图”：http://www.littleindia.ca/images/menu/fmenu02.jpg，“ImagePath_FullPhoto”：http://www.littleindia.ca/images/menu/fmenu02.jpg}，{“ImageID”：“3”，“ImageName”：“Item3”，“ImagePath_缩略图”：http://www.littleindia.ca/images/menu/fmenu03.jpg，“ImagePath_FullPhoto”：http://www.littleindia.ca/images/menu/fmenu03.jpg}，{“ImageID”：“4”，“ImageName”：“Item4”ImagePath_缩略图“：”http://www.littleindia.ca/images/menu/fmenu04.jpg，“ImagePath_FullPhoto”：http://www.littleindia.ca/images/menu/fmenu04.jpg"}]
06-20 05:15:24.248:W/System.err（833）：位于org.json.JSONTokener.syntaxError（JSONTokener.java:450）
06-20 05:15:24.329:W/System.err（833）：位于org.json.JSONTokener.readObject（JSONTokener.java:394）
06-20 05:15:24.348:W/System.err（833）：位于org.json.JSONTokener.nextValue（JSONTokener.java:100）
06-20 05:15:24.359:W/System.err（833）：位于org.json.JSONTokener.readArray（JSONTokener.java:430）
06-20 05:15:24.410:W/System.err（833）：位于org.json.JSONTokener.nextValue（JSONTokener.java:103）
06-20 05:15:24.410:W/System.err（833）：位于org.json.JSONArray（JSONArray.java:87）
06-20 05:15:24.418:W/System.err（833）：位于org.json.JSONArray（JSONArray.java:103）
06-20 05:15:24.418:W/System.err（833）：在app.tabsample.GalleryActivity$DownloadJSONFileAsync.doInBackground（GalleryActivity.java:230）
06-20 05:15:24.418:W/System.err（833）：在app.tabsample.GalleryActivity$DownloadJSONFileAsync.doInBackground（GalleryActivity.java:1）
06-20 05:15:24.418:W/System.err（833）：在android.os.AsyncTask$2.call（AsyncTask.java:287）
06-20 05:15:24.468:W/System.err（833）：在java.util.concurrent.FutureTask.run（FutureTask.java:234）处
06-20 05:15:24.479:W/System.err（833）：在android.os.AsyncTask$SerialExecutor$1.run（AsyncTask.java:230）
06-20 05:15:24.479:W/System.err（833）：位于java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1080）
06-20 05:15:24.479:W/System.err（833）：位于java.util.concurrent.ThreadPoolExecutor$Worker.run（ThreadPoolExecutor.java:573）
06-20 05:15:24.489:W/System.err（833）：位于java.lang.Thread.run（Thread.java:856）
06-20 05:15:24.498:D/AndroidRuntime（833）：关闭虚拟机
06-20 05:15:24.498:W/dalvikvm（833）：threadid=1:线程退出时出现未捕获异常（组=0x40a71930）
06-20 05:15:24.530:E/AndroidRuntime（833）：致命异常：主
06-20 05:15:24.530:E/AndroidRuntime（833）：java.lang.NullPointerException
06-20 05:15:24.530:E/AndroidRuntime（833）：在app.tabsample.GalleryActivity$ImageAdapter.getCount（GalleryActivity.java:170）
06-20 05:15:24.530:E/AndroidRuntime（833）：在android.widget.GridView.setAdapter（GridView.java:182）上
06-20 05:15:24.530:E/AndroidRuntime（833）：在app.tabsample.GalleryActivity.ShowAllContent（GalleryActivity.java:143）中
06-20 05:15:24.530:E/AndroidRuntime（833）：在app.tabsample.GalleryActivity$DownloadJSONFileAsync.onPostExecute（GalleryActivity.java:256）
06-20 05:15:24.530:E/AndroidRuntime（833）：在app.tabsample.GalleryActivity$DownloadJSONFileAsync.onPostExecute（GalleryActivity.java:1）
06-20 05:15:24.530:E/AndroidRuntime（833）：在android.os.AsyncTask.finish（AsyncTask.java:631）
06-20 05:15:24.530:E/AndroidRuntime（833）：在android.os.AsyncTask.access$600（AsyncTask.java:177）
06-20 05:15:24.530:E/AndroidRuntime（833）：位于android.os.AsyncTask$InternalHandler.handleMessage（AsyncTask.java:644）
06-20 05:15:24.530:E/AndroidRuntime（833）：位于android.os.Handler.dispatchMessage（Handler.java:99）
06-20 05:15:24.530:E/AndroidRuntime（833）：在android.os.Looper.loop（Looper.java:137）
06-20 05:15:24.530:E/AndroidRuntime（833）：位于android.app.ActivityThread.main（ActivityThread.java:5041）
06-20 05:15:24.530:E/AndroidRuntime（833）：位于java.lang.reflect.Method.Invokenactive（本机方法）
06-20 05:15:24.530:E/AndroidRuntime（833）：在java.lang.reflect.Method.invoke（Method.java:511）
06-20 05:15:24.530:E/AndroidRuntime（833）：在com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run（ZygoteInit.java:793）
06-20 05:15:24.530:E/AndroidRuntime（833）：位于com.android.internal.os.ZygoteInit.main（ZygoteInit.java:560）
06-20 05:15:24.530:E/AndroidRuntime（833）：在dalvik.system.NativeStart.main（本机方法）
06-20 05:15:27.409:I/进程（833）：发送信号。PID:833信号：9
06-20 05:15:23.298: D/dalvikvm(833): GC_CONCURRENT freed 302K, 7% free 5823K/6248K, paused 71ms+24ms, total 162ms
06-20 05:15:23.418: I/Choreographer(833): Skipped 78 frames! The application may be doing too much work on its main thread.
06-20 05:15:23.678: I/Choreographer(833): Skipped 45 frames! The application may be doing too much work on its main thread.
06-20 05:15:24.248: W/System.err(833): org.json.JSONException: Unterminated object at character 111 of [{"ImageID":"1","ImageName":"Item1","ImagePath_Thumbnail":"http://www.littleindia.ca/images/menu/fmenu01.jpg,"ImagePath_FullPhoto":"http://www.littleindia.ca/images/menu/fmenu01.jpg"},{"ImageID":"2","ImageName":"Item2","ImagePath_Thumbnail":"http://www.littleindia.ca/images/menu/fmenu02.jpg","ImagePath_FullPhoto":"http://www.littleindia.ca/images/menu/fmenu02.jpg"},{"ImageID":"3","ImageName":"Item3","ImagePath_Thumbnail":"http://www.littleindia.ca/images/menu/fmenu03.jpg","ImagePath_FullPhoto":"http://www.littleindia.ca/images/menu/fmenu03.jpg"},{"ImageID":"4","ImageName":"Item4","ImagePath_Thumbnail":"http://www.littleindia.ca/images/menu/fmenu04.jpg","ImagePath_FullPhoto":"http://www.littleindia.ca/images/menu/fmenu04.jpg"}]
06-20 05:15:24.248: W/System.err(833): at org.json.JSONTokener.syntaxError(JSONTokener.java:450)
06-20 05:15:24.329: W/System.err(833): at org.json.JSONTokener.readObject(JSONTokener.java:394)
06-20 05:15:24.348: W/System.err(833): at org.json.JSONTokener.nextValue(JSONTokener.java:100)
06-20 05:15:24.359: W/System.err(833): at org.json.JSONTokener.readArray(JSONTokener.java:430)
06-20 05:15:24.410: W/System.err(833): at org.json.JSONTokener.nextValue(JSONTokener.java:103)
06-20 05:15:24.410: W/System.err(833): at org.json.JSONArray.<init>(JSONArray.java:87)
06-20 05:15:24.418: W/System.err(833): at org.json.JSONArray.<init>(JSONArray.java:103)
06-20 05:15:24.418: W/System.err(833): at app.tabsample.GalleryActivity$DownloadJSONFileAsync.doInBackground(GalleryActivity.java:230)
06-20 05:15:24.418: W/System.err(833): at app.tabsample.GalleryActivity$DownloadJSONFileAsync.doInBackground(GalleryActivity.java:1)
06-20 05:15:24.418: W/System.err(833): at android.os.AsyncTask$2.call(AsyncTask.java:287)
06-20 05:15:24.468: W/System.err(833): at java.util.concurrent.FutureTask.run(FutureTask.java:234)
06-20 05:15:24.479: W/System.err(833): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
06-20 05:15:24.479: W/System.err(833): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
06-20 05:15:24.479: W/System.err(833): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
06-20 05:15:24.489: W/System.err(833): at java.lang.Thread.run(Thread.java:856)
06-20 05:15:24.498: D/AndroidRuntime(833): Shutting down VM
06-20 05:15:24.498: W/dalvikvm(833): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
06-20 05:15:24.530: E/AndroidRuntime(833): FATAL EXCEPTION: main
06-20 05:15:24.530: E/AndroidRuntime(833): java.lang.NullPointerException
06-20 05:15:24.530: E/AndroidRuntime(833): at app.tabsample.GalleryActivity$ImageAdapter.getCount(GalleryActivity.java:170)
06-20 05:15:24.530: E/AndroidRuntime(833): at android.widget.GridView.setAdapter(GridView.java:182)
06-20 05:15:24.530: E/AndroidRuntime(833): at app.tabsample.GalleryActivity.ShowAllContent(GalleryActivity.java:143)
06-20 05:15:24.530: E/AndroidRuntime(833): at app.tabsample.GalleryActivity$DownloadJSONFileAsync.onPostExecute(GalleryActivity.java:256)
06-20 05:15:24.530: E/AndroidRuntime(833): at app.tabsample.GalleryActivity$DownloadJSONFileAsync.onPostExecute(GalleryActivity.java:1)
06-20 05:15:24.530: E/AndroidRuntime(833): at android.os.AsyncTask.finish(AsyncTask.java:631)
06-20 05:15:24.530: E/AndroidRuntime(833): at android.os.AsyncTask.access$600(AsyncTask.java:177)
06-20 05:15:24.530: E/AndroidRuntime(833): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644)
06-20 05:15:24.530: E/AndroidRuntime(833): at android.os.Handler.dispatchMessage(Handler.java:99)
06-20 05:15:24.530: E/AndroidRuntime(833): at android.os.Looper.loop(Looper.java:137)
06-20 05:15:24.530: E/AndroidRuntime(833): at android.app.ActivityThread.main(ActivityThread.java:5041)
06-20 05:15:24.530: E/AndroidRuntime(833): at java.lang.reflect.Method.invokeNative(Native Method)
06-20 05:15:24.530: E/AndroidRuntime(833): at java.lang.reflect.Method.invoke(Method.java:511)
06-20 05:15:24.530: E/AndroidRuntime(833): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
06-20 05:15:24.530: E/AndroidRuntime(833): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
06-20 05:15:24.530: E/AndroidRuntime(833): at dalvik.system.NativeStart.main(Native Method)
06-20 05:15:27.409: I/Process(833): Sending signal. PID: 833 SIG: 9
public class ImageAdapter extends BaseAdapter
{
private Context context;
private ArrayList<HashMap<String, Object>> MyArr = new ArrayList<HashMap<String, Object>>();
public ImageAdapter(Context c, ArrayList<HashMap<String, Object>> myArrList)
{
// TODO Auto-generated method stub
context = c;
MyArr = myArrList;
}
public int getCount() {
// TODO Auto-generated method stub
return MyArr.size();
}
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (convertView == null) {
convertView = inflater.inflate(R.layout.activity_gallery_column, null);
}
// ColPhoto
ImageView imageView = (ImageView) convertView.findViewById(R.id.ColPhoto);
imageView.getLayoutParams().height = 80;
imageView.getLayoutParams().width = 80;
imageView.setPadding(10, 10, 10, 10);
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
try
{
imageView.setImageBitmap((Bitmap)MyArr.get(position).get("ImageThumBitmap"));
} catch (Exception e) {
// When Error
imageView.setImageResource(android.R.drawable.ic_menu_report_image);
}
// ColID
TextView txtID = (TextView) convertView.findViewById(R.id.ColID);
txtID.setPadding(5, 0, 0, 0);
txtID.setText("ID : " + MyArr.get(position).get("ImageID").toString());
// ColName
TextView txtName = (TextView) convertView.findViewById(R.id.ColName);
txtName.setPadding(5, 0, 0, 0);
txtName.setText("Name : " + MyArr.get(position).get("ImageName").toString());
return convertView;
}
}
公共类ImageAdapter扩展了BaseAdapter
{
私人语境；
private ArrayList MyArr=new ArrayList（）；
公共ImageAdapter（上下文c，ArrayList myArrList）
{
//TODO自动生成的方法存根
上下文=c；
MyArr=myArrList；
}
public int getCount（）{
//TODO自动生成的方法存根
返回MyArr.size（）；
}
公共对象getItem（int位置）{
//TODO自动生成方法stu