我在ListView中选择一行时设置了一种颜色。我收到以下错误日志。请告诉我我做错了什么。我的代码如下：
View view = inflater.inflate(R.layout.friendsretrieval, container,
false);
final SwipeListView swipy=(SwipeListView)view.findViewById(R.id.example_swipe_lv_list);
swipy.setSwipeMode(SwipeListView.SWIPE_MODE_RIGHT);
ListAdapter k=new SimpleAdapter(getActivity(),val,R.layout.custom_row,new String[]{"fbname"},new int[]{R.id.example_itemname}){
@Override
public View getView(int position, final View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
final View v = super.getView(position, convertView, parent);
final ImageView ii=(ImageView)v.findViewById(R.id.example_imagess);
swipy.setOffsetRight(convertDpToPixel(280f));
@Override
public void onMove(int position, float x) {
// int i=0;
Log.i("moved position",""+x);
//Toast.makeText(getActivity(),"moved"+position+""+x,Toast.LENGTH_SHORT).show();
if(x>0)
{
ii.setVisibility(v.VISIBLE);
convertView.setBackgroundColor(Color.BLUE);
}
else
{
ii.setVisibility(v.INVISIBLE);
}
}
});
return v;
}
};
swipy.setAdapter(k);
return view;
}
错误日志：
04-17 03:47:07.540: E/InputEventReceiver(7473): Exception dispatching input event.
-17 03:47:07.690: E/AndroidRuntime(7473): FATAL EXCEPTION: main
-17 03:47:07.690: E/AndroidRuntime(7473): Process: com.example.taskmanager, PID: 7473
04-17 03:47:07.690: E/AndroidRuntime(7473): java.lang.NullPointerException
-17 03:47:07.690: E/AndroidRuntime(7473): at com.example.taskmanager.myfriends$1$1.onMove(myfriends.java:132)
04-17 03:47:07.690: E/AndroidRuntime(7473): at com.fortysevendeg.swipelistview.SwipeListView.onMove(SwipeListView.java:491)
04-17 03:47:07.690: E/AndroidRuntime(7473): at com.fortysevendeg.swipelistview.SwipeListViewTouchListener.move(SwipeListViewTouchListener.java:902)
04-17 03:47:07.690: E/AndroidRuntime(7473): at com.fortysevendeg.swipelistview.SwipeListViewTouchListener.onTouch(SwipeListViewTouchListener.java:875)
-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.View.dispatchTouchEvent(View.java:7701)
-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2210)
-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1945)
04-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
04-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
04-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
04-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
04-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
04-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
04-17 03:47:07.690: E/AndroidRuntime(7473): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2068)
-17 03:47:07.690: E/AndroidRuntime(7473): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1515)
04-17 03:47:07.690: E/AndroidRuntime(7473): at android.app.Activity.dispatchTouchEvent(Activity.java:2458)
04-17 03:47:07.690: E/AndroidRuntime(7473): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2016)
04-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.View.dispatchPointerEvent(View.java:7886)
04-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:3954)
04-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:3833)
04-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3399)
04-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3449)
-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3418)
04-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3525)
04-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3426)
04-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3582)
04-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3399)
04-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3449)
04-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3418)
04-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3426)
04-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3399)
04-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:5602)
04-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:5582)
04-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:5553)
04-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:5682)
04-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)
04-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.InputEventReceiver.nativeConsumeBatchedInputEvents(Native Method)
04-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.InputEventReceiver.consumeBatchedInputEvents(InputEventReceiver.java:176)
04-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.ViewRootImpl.doConsumeBatchedInput(ViewRootImpl.java:5655)
04-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.ViewRootImpl$ConsumeBatchedInputRunnable.run(ViewRootImpl.java:5701)
04-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
04-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.Choreographer.doCallbacks(Choreographer.java:574)
04-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.Choreographer.doFrame(Choreographer.java:542)
04-17 03:47:07.690: E/AndroidRuntime(7473): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
-17 03:47:07.690: E/AndroidRuntime(7473): at android.os.Handler.handleCallback(Handler.java:733)
04-17 03:47:07.690: E/AndroidRuntime(7473): at android.os.Handl
答案 0 :(得分：1)
convertView是null。
如果convertView为空，您将需要对行XML进行充气并使用它 - 只有在有要回收的内容时才会填充它。
这样的事情：
@Override
public View getView(int position, final View convertView, ViewGroup parent) {
View v = convertView;
if (v == null)
v = super.getView(position, convertView, parent);
final ImageView ii=(ImageView)v.findViewById(R.id.example_imagess);
swipy.setOffsetRight(convertDpToPixel(280f));
@Override
public void onMove(int position, float x) {
if(x>0) {
ii.setVisibility(v.VISIBLE);
v.setBackgroundColor(Color.BLUE);
}
else {
ii.setVisibility(v.INVISIBLE);
}
}
});
return v;
}
如果可能的话，重用旧视图。注意：在使用之前，应检查此视图是否为非null且类型是否合适。如果无法转换此视图以显示正确的数据，则此方法可以创建新视图