我有RecyclerView
我有数据和适配器来处理所有点击。当我从RecyclerView
点击某个项目时,我想要加载一个片段。现在我想要的是,当从同一个RecyclerView
点击一个项目时,用片段替换Recycler View
。
我试过这个,但是它遇到了错误
适配器
holder.cvContact.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
SingleContactFragment singleContactFragment = SingleContactFragment.newInstance(contact);
FragmentTransaction transaction = ((Activity) context).getFragmentManager().beginTransaction();
transaction.replace(R.id.rv_contact_list, singleContactFragment);
transaction.commit();
}
});
其中 rv_contact_list 是当前的RecyclerView。
错误是
01-19 20:35:01.892 13088-13088/com.xzii.pkg E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.xzii.pkg, PID: 13088
java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.support.v7.widget.RecyclerView$ViewHolder.shouldIgnore()' on a null object reference
at android.support.v7.widget.RecyclerView.findMinMaxChildLayoutPositions(RecyclerView.java:3869)
at android.support.v7.widget.RecyclerView.dispatchLayoutStep1(RecyclerView.java:3604)
at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:3408)
答案 0 :(得分:0)
基本上,该错误抱怨分配给RecyclerView适配器的“上下文数据不足”。尝试将适配器设置为null并删除它,然后添加新片段。现在只有Kotlin示例代码。
val topicListFragment:TopicListFragment = supportFragmentManager.findFragmentById(R.id.topicListFragment) as TopicListFragment
topicListFragment.removeAdaptor()
supportFragmentManager.beginTransaction().remove(topicListFragment).commit()
val topicFragment = TopicFragment()
supportFragmentManager.beginTransaction().add(R.id.homeContent, topicFragment).commit()
清空适配器后,您可能不再需要删除片段,日志消息显示
RecyclerView:未连接适配器;跳过布局