Question

我有一个由if (currentX + ball_radius >= MAX_WIDTH) velocityX = -velocityX; if (currentY + ball_radius >= MAX_HEIGHT) velocityY = -velocityY;填充的alter 'tablename', NAME => 'newcolumnfamily', VERSIONS => 50。数据加载，但是当我尝试滚动时，它会崩溃

logcat的：

ListView

Listview的活动

JSONArray

适配器

09-19 11:50:53.512  15110-15110/io.moffat.kitchenpal E/InputEventReceiver﹕ Exception dispatching input event.
09-19 11:50:53.513  15110-15110/io.moffat.kitchenpal E/MessageQueue-JNI﹕ Exception in MessageQueue callback: handleReceiveCallback
09-19 11:50:53.514  15110-15110/io.moffat.kitchenpal E/MessageQueue-JNI﹕ java.lang.NullPointerException: Attempt to invoke virtual method 'int android.graphics.Bitmap.getWidth()' on a null object reference
            at android.graphics.Bitmap.createScaledBitmap(Bitmap.java:591)
            at com.pkmmte.view.CircularImageView.refreshBitmapShader(CircularImageView.java:341)
            at com.pkmmte.view.CircularImageView.invalidate(CircularImageView.java:262)
            at android.widget.ImageView.setImageDrawable(ImageView.java:456)
            at com.squareup.picasso.PicassoDrawable.setPlaceholder(PicassoDrawable.java:61)
            at com.squareup.picasso.RequestCreator.into(RequestCreator.java:664)
            at com.squareup.picasso.RequestCreator.into(RequestCreator.java:601)
            at io.moffat.kitchenpal.RecipeAdapter.getView(RecipeAdapter.java:87)
            at android.widget.AbsListView.obtainView(AbsListView.java:2347)
            at android.widget.ListView.makeAndAddView(ListView.java:1864)
            at android.widget.ListView.fillDown(ListView.java:698)
            at android.widget.ListView.fillGap(ListView.java:662)
            at android.widget.AbsListView.trackMotionScroll(AbsListView.java:4991)
            at android.widget.AbsListView.scrollIfNeeded(AbsListView.java:3418)
            at android.widget.AbsListView.onTouchMove(AbsListView.java:3801)
            at android.widget.AbsListView.onTouchEvent(AbsListView.java:3632)
            at android.view.View.dispatchTouchEvent(View.java:8471)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2399)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2092)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
            at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2369)
            at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1719)
            at android.app.Activity.dispatchTouchEvent(Activity.java:2742)
            at android.support.v7.internal.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:59)
            at android.support.v7.internal.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:59)
            at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2330)
            at android.view.View.dispatchPointerEvent(View.java:8666)
            at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4123)
            at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:3989)
            at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3544)
            at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3597)
            at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3563)
            at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3680)
            at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3571)
            at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3737)
            at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3544)
            at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3597)
            at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3563)
            at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3571)
            at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3544)
            at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:5807)
            at android.view.ViewRootImpl.doPr
09-19 11:50:53.516  15110-15110/io.moffat.kitchenpal E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: io.moffat.kitchenpal, PID: 15110
    java.lang.NullPointerException: Attempt to invoke virtual method 'int android.graphics.Bitmap.getWidth()' on a null object reference
            at android.graphics.Bitmap.createScaledBitmap(Bitmap.java:591)
            at com.pkmmte.view.CircularImageView.refreshBitmapShader(CircularImageView.java:341)
            at com.pkmmte.view.CircularImageView.invalidate(CircularImageView.java:262)
            at android.widget.ImageView.setImageDrawable(ImageView.java:456)
            at com.squareup.picasso.PicassoDrawable.setPlaceholder(PicassoDrawable.java:61)
            at com.squareup.picasso.RequestCreator.into(RequestCreator.java:664)
            at com.squareup.picasso.RequestCreator.into(RequestCreator.java:601)
            at io.moffat.kitchenpal.RecipeAdapter.getView(RecipeAdapter.java:87)
            at android.widget.AbsListView.obtainView(AbsListView.java:2347)
            at android.widget.ListView.makeAndAddView(ListView.java:1864)
            at android.widget.ListView.fillDown(ListView.java:698)
            at android.widget.ListView.fillGap(ListView.java:662)
            at android.widget.AbsListView.trackMotionScroll(AbsListView.java:4991)
            at android.widget.AbsListView.scrollIfNeeded(AbsListView.java:3418)
            at android.widget.AbsListView.onTouchMove(AbsListView.java:3801)
            at android.widget.AbsListView.onTouchEvent(AbsListView.java:3632)
            at android.view.View.dispatchTouchEvent(View.java:8471)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2399)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2092)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
            at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
            at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2369)
            at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1719)
            at android.app.Activity.dispatchTouchEvent(Activity.java:2742)
            at android.support.v7.internal.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:59)
            at android.support.v7.internal.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:59)
            at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2330)
            at android.view.View.dispatchPointerEvent(View.java:8666)
            at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4123)
            at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:3989)
            at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3544)
            at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3597)
            at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3563)
            at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3680)
            at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3571)
            at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3737)
            at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3544)
            at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3597)
            at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3563)
            at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3571)
            at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3544)
            at android.view.ViewRootImpl.deliverInputEv

我无法弄清楚它为什么会崩溃。我认为这是基于类似问题的JSON错误，因此我进行了条件检查以确保JSONObject具有我正在寻找的字段。

Answer 1

它实际上不是JSONException。正如您在Logs中看到的那样，对Bitmap的空引用在调用getWidth时引发异常。

我能看到的唯一可以发生的地方是：

Picasso.with(activity)
       .load(image)
       .centerCrop()
       .resize(50, 50)
       .into(icon);

你应该检查你是否正在向Picasso提供有效的网址，如果没有，Picasso会抛出异常。

ListView在滚动Android时崩溃

1 个答案: