我收到强制关闭错误，当我尝试向下滚动我的列表视图中的片段活动，其中有1图像查看和2文本视图。我是初学者在Android中，所以不必除了在Android系统主要用于元器件基本方案，很多知识。

I am getting force close errors while I try to scroll down my list View in fragment activity, which has 1 image View and 2 text view. I am beginner in android, so don't have that much knowledge except basic scenario in mostly used components of android.

没有位图OOM错误是存在的，因为我查无图像了。

No bitmap OOM error is there, as I checked without images too.

我从检索路径从SD卡的图像。

I am retrieving images from sd card from the path.

下面，是我的logcat了把有错误的。

Here, is my logcat out put with errors.

04-05 18:07:02.868: E/AndroidRuntime(3257): FATAL EXCEPTION: main
04-05 18:07:02.868: E/AndroidRuntime(3257): java.lang.NullPointerException
04-05 18:07:02.868: E/AndroidRuntime(3257):     at com.example.prac.HomeUser$ReceiptAdapter.getView(HomeUser.java:861)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.widget.AbsListView.obtainView(AbsListView.java:2588)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.widget.ListView.makeAndAddView(ListView.java:1840)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.widget.ListView.fillDown(ListView.java:681)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.widget.ListView.fillGap(ListView.java:645)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.widget.AbsListView.trackMotionScroll(AbsListView.java:6535)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.widget.AbsListView.scrollIfNeeded(AbsListView.java:3664)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.widget.AbsListView.onTouchEvent(AbsListView.java:4492)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.view.View.dispatchTouchEvent(View.java:7677)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2395)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2119)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2401)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2134)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2401)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2134)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2401)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2134)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2401)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2134)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2401)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2134)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2401)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2134)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2305)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1575)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.app.Activity.dispatchTouchEvent(Activity.java:2470)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2253)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.view.View.dispatchPointerEvent(View.java:7875)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.view.ViewRootImpl.deliverPointerEvent(ViewRootImpl.java:3978)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:3862)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:5105)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:5084)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:5182)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.view.InputEventReceiver.nativeConsumeBatchedInputEvents(Native Method)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.view.InputEventReceiver.consumeBatchedInputEvents(InputEventReceiver.java:174)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.view.ViewRootImpl.doConsumeBatchedInput(ViewRootImpl.java:5155)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.view.ViewRootImpl$ConsumeBatchedInputRunnable.run(ViewRootImpl.java:5201)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.view.Choreographer$CallbackRecord.run(Choreographer.java:791)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.view.Choreographer.doCallbacks(Choreographer.java:591)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.view.Choreographer.doFrame(Choreographer.java:559)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:777)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.os.Handler.handleCallback(Handler.java:725)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.os.Handler.dispatchMessage(Handler.java:92)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.os.Looper.loop(Looper.java:176)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at android.app.ActivityThread.main(ActivityThread.java:5302)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at java.lang.reflect.Method.invokeNative(Native Method)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at java.lang.reflect.Method.invoke(Method.java:511)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
04-05 18:07:02.868: E/AndroidRuntime(3257):     at dalvik.system.NativeStart.main(Native Method)

现在这里是我的code ..

Now here is my code..

class ReceiptAdapter extends BaseAdapter {

    ArrayList<GetterSetter> receiptlist;
    private LayoutInflater inflater;

    // private int[] colors = new int[] { Color.parseColor("#C8A6DA"),
    // Color.parseColor("#F6F4AB"), Color.parseColor("#A2C3D0"),
    // Color.parseColor("#F1B4A1") };

    private int[] colors = new int[] { Color.parseColor("#2280aee3"),
            Color.parseColor("#22888888") };

    public ReceiptAdapter(Context context,
            ArrayList<GetterSetter> receiptlist) {
        // TODO Auto-generated method stub
        this.receiptlist = receiptlist;
        // inflater = LayoutInflater.from(context);
        // inflater = LayoutInflater.from(context.getApplicationContext());
        inflater = (LayoutInflater) getActivity().getSystemService(
                Context.LAYOUT_INFLATER_SERVICE);
    }

    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return receiptlist.size();
    }

    @Override
    public Object getItem(int arg0) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub
        ViewHolder holder = null;
        if (convertView == null) {
            // convertView = inflater.inflate(R.layout.custom_list, null);
            convertView = inflater.inflate(R.layout.custom_list, parent,
                    false);

            // if (position % 2 == 1) {
            // convertView.setBackgroundColor(Color.BLUE);
            // } else {
            // convertView.setBackgroundColor(Color.CYAN);
            // }

            int colorPos = position % colors.length;
            convertView.setBackgroundColor(colors[colorPos]);

            holder = new ViewHolder();
            holder.Title = (TextView) convertView.findViewById(R.id.name);
            holder.Total = (TextView) convertView.findViewById(R.id.total);
            holder.Img = (ImageView) convertView
                    .findViewById(R.id.profile_image);

            Animation animation = null;
            animation = AnimationUtils.loadAnimation(getActivity(),
                    R.anim.wave);
            animation.setDuration(200);
            convertView.startAnimation(animation);
            animation = null;

            convertView.setTag(holder);
        } else {
            convertView.getTag();
        }

        holder.Title.setText(receiptlist.get(position).getTitle());
        holder.Total.setText(receiptlist.get(position).getTotal());

        String path = receiptlist.get(position).getImg();
        File fileImg = new File(path);
        Bitmap bitmap = null;
        if (fileImg.exists()) {

            BitmapFactory.Options options = new BitmapFactory.Options();
            options.inSampleSize = 7;



            bitmap = BitmapFactory.decodeFile(fileImg.getAbsolutePath(),
                    options);

            // bitmap = BitmapFactory.decodeFile(fileImg.getAbsolutePath());
            holder.Img.setImageBitmap(bitmap);

        }
        else
        {
            Bitmap icon = BitmapFactory.decodeResource(getActivity().getResources(),
                    R.drawable.no_image);

            holder.Img.setImageBitmap(icon);
        }

        holder.Img.setScaleType(ScaleType.CENTER_CROP);

        return convertView;
    }

    class ViewHolder {
        TextView Title;
        TextView Total;
        ImageView Img;
    }


}

和我的异步任务，这在postExecute（）我打电话的自定义列表适配器，

and my async task in which in postExecute() I am calling the custom list adapter as,

ReceiptAdapter adapter = new ReceiptAdapter(getActivity(),
                        recList);
                setListAdapter(adapter);

所以，我的问题是我在哪里得到了？

So, my question is where am I getting wrong?

我已经搜查了许多codeS也计算器，太多，但我发现别人同样的错误，但没有得到任何好的可行的解决方案，因此，如果有人可以帮助我在这，那么这将是AP preciated。由于一吨！

I have searched many codes also on stackoverflow, too but I found the same errors of others but didn't get any good feasible solution, so if anybody could help me out in this, then it would be appreciated. Thanks a ton!

推荐答案

您持有者是空，永远。在方法 getView 分配null以持有人。 在其他应先分配标记对象持有人。

Your holder is null, always. In method getView you assign null to holder. In else you should assign tagged object to holder.

在你的方法，getView（）：

In your method, getView():

{
//...
} else {
holder = (ViewHolder)convertView.getTag();
}