小编sve*_*vdz的帖子

我想在我的recyclerview中显示这些项目,但它根本没有显示,我看不到错误.也许你们可以帮助我.

MainActivity.java

    RecyclerView recyclerView = (RecyclerView)findViewById(R.id.rec);
List<MenuData> list = new ArrayList<>();
        recyclerView.setHasFixedSize(true);
        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
        linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
        recyclerView.setLayoutManager(linearLayoutManager);

        MenuRecAdapter menuRecAdapter = new MenuRecAdapter(list);
        recyclerView.setAdapter(menuRecAdapter);

RecyclerView适配器:

    public class MenuRecAdapter extends RecyclerView.Adapter<RecViewHolder>{

    private List<MenuData> mList;
    Activity context;

    public MenuRecAdapter(List<MenuData> mList){
        this.mList = mList;
    }

    public int getItemCount(){
        return mList.size();
    }

    public RecViewHolder onCreateViewHolder(ViewGroup viewGroup, int position){

        View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.menuitem, viewGroup, false);
        RecViewHolder pvh = new RecViewHolder(v);
        return pvh;
    }

    public void onBindViewHolder(RecViewHolder holder, int i){
        holder.menuTeXT.setText(mList.get(i).text);
    }

    @Override
    public void …

这是我第一次使用recyclerview,我在android:onClick="addItem"这里得到一些错误,这是当我尝试向我的recyclerview添加一行文本时得到的.我经常使用手机测试我的应用程序.

java.lang.IllegalStateException: Could not execute method of the activity
            at android.view.View$1.onClick(View.java:4012)
            at android.view.View.performClick(View.java:4761)
            at android.view.View$PerformClick.run(View.java:19767)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5312)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:901)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:696)
     Caused by: java.lang.reflect.InvocationTargetException
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at android.view.View$1.onClick(View.java:4007)
            at android.view.View.performClick(View.java:4761)
            at android.view.View$PerformClick.run(View.java:19767)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5312)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:901)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:696)
     Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.text.Editable android.widget.EditText.getText()' on a null object reference …