dropDownListView setOnBottomListener抛出Null指针

[henrybit]

代码片段：
dropDownListView = (DropDownListView)findViewById(R.id.list_view);
try {
dropDownListView.setOnBottomListener(new OnClickListener() {
@OverRide
public void onClick(View v) {
new GetDataTask(false).execute();
}
});
} catch (Exception e) {
e.printStackTrace();
}
情况：已debug跟踪过dropDownListView不是null
异常信息：
03-28 20:37:11.200 15372-15372/community.o2o.com.meimo W/System.err﹕ java.lang.NullPointerException
03-28 20:37:11.220 15372-15372/community.o2o.com.meimo W/System.err﹕ at cn.trinea.android.common.view.DropDownListView.setOnBottomListener(DropDownListView.java:351)
03-28 20:37:11.220 15372-15372/community.o2o.com.meimo W/System.err﹕ at community.o2o.com.meimo.view.SearchListActivity.onCreate(SearchListActivity.java:36)
03-28 20:37:11.220 15372-15372/community.o2o.com.meimo W/System.err﹕ at android.app.Activity.performCreate(Activity.java:5453)
03-28 20:37:11.220 15372-15372/community.o2o.com.meimo W/System.err﹕ at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1093)
03-28 20:37:11.220 15372-15372/community.o2o.com.meimo W/System.err﹕ at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2377)
03-28 20:37:11.220 15372-15372/community.o2o.com.meimo W/System.err﹕ at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2471)
03-28 20:37:11.225 15372-15372/community.o2o.com.meimo W/System.err﹕ at android.app.ActivityThread.access$900(ActivityThread.java:175)
03-28 20:37:11.225 15372-15372/community.o2o.com.meimo W/System.err﹕ at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1308)
03-28 20:37:11.225 15372-15372/community.o2o.com.meimo W/System.err﹕ at android.os.Handler.dispatchMessage(Handler.java:102)
03-28 20:37:11.225 15372-15372/community.o2o.com.meimo W/System.err﹕ at android.os.Looper.loop(Looper.java:146)
03-28 20:37:11.225 15372-15372/community.o2o.com.meimo W/System.err﹕ at android.app.ActivityThread.main(ActivityThread.java:5602)
03-28 20:37:11.225 15372-15372/community.o2o.com.meimo W/System.err﹕ at java.lang.reflect.Method.invokeNative(Native Method)
03-28 20:37:11.225 15372-15372/community.o2o.com.meimo W/System.err﹕ at java.lang.reflect.Method.invoke(Method.java:515)
03-28 20:37:11.230 15372-15372/community.o2o.com.meimo W/System.err﹕ at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
03-28 20:37:11.230 15372-15372/community.o2o.com.meimo W/System.err﹕ at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
03-28 20:37:11.230 15372-15372/community.o2o.com.meimo W/System.err﹕ at dalvik.system.NativeStart.main(Native Method)

[henrybit]

IDE环境：Android studio
gradle：compile 'cn.trinea.android.common:trinea-android-common:4.2.15'

[Trinea]

看下 isOnBottomStyle 是否为空