如何在recyclerView适配器中使用getItemAtPosition（）？ [英] How to use getItemAtPosition() in recyclerView adapter?

问题描述

我正在尝试从数据库中获取数据，当点击项目时，我会打算进行另一项活动，但是使用listView我可以使用方法getItemAtPosition（）和使用recyclerView我不知道该怎么做。我在这行代码中遇到错误：

光标cursorItem =（光标）mGridAdapter.getItem（position）; 

 mGridAdapter.setOnItemClickListener（ new  OnItemClickListener （）{
  @ Override  
  public   void  onItemClick（查看视图， int 位置）{
 Toast.makeText（MainActivity。这个， 它的工作原理！，Toast.LENGTH_SHORT）。show（）; 
 Cursor cursorItem =（Cursor）mGridAdapter.getItem（position）; 
 birthdayId = cursorItem.getInt（cursorItem.getColumnIndex（DBHelper.BIRTHDAY_ID））; 
 Intent intent = 新意图（MainActivity。 此，EditBirthdayActivity。 class ）; 
 intent.putExtra（KEY_EXTRA_BIRTHDAY_ID，birthdayId）; 
 startActivity（intent）; 
} 
}）; 

 11-08 00:52： 43.179 26181-26181 / com.dusandimitrijevic.dontforget E / AndroidRuntime：FATAL EXCEPTION：main 
 11-08 00：52：43.179 26181-26181 / com.dusandimitrijevic.dontforget E / AndroidRuntime：Process：com.dusandimitrijevic.dontforget ，PID：26181 
 11-08 00：52：43.179 26181-26181 / com.dusandimitrijevic.dontforget E / AndroidRuntime：java.lang.ClassCastException：model.Birthday无法强制转换为android.database.Cursor 
 11-08 00：52：43.179 26181-26181 / com.dusandimitrijevic.dontforget E / AndroidRuntime：at com.dusandimitrijevic.dontforget.MainActivity $ 1.onItemClick（MainActivity.java:94）
 11-08 00:52 ：43.179 26181-26181 / com.dusandimitrijevic.dontforget E / AndroidRuntime：at adapter.GridAdapter $ MyViewHolder.onClick（GridAdapter.java:43）
 11-08 00：52：43.179 26181-26181 / com.dusandimitrijevic。 dontforget E / AndroidRuntime：在android.view.View.performClick（View.java:5197）
 11-08 00：52：43.179 2 6181-26181 / com.dusandimitrijevic.dontforget E / AndroidRuntime：at android.view.View $ PerformClick.run（View.java:20926) 
 11-08 00：52：43.179 26181-26181 / com.dusandimitrijevic。 dontforget E / AndroidRuntime：在android.os.Handler.handleCallback（Handler.java:739）
 11-08 00：52：43.179 26181-26181 / com.dusandimitrijevic.dontforget E / AndroidRuntime：at android.os。 Handler.dispatchMessage（Handler.java:95）
 11-08 00：52：43.179 26181-26181 / com.dusandimitrijevic.dontforget E / AndroidRuntime：at android.os.Looper.loop（Looper.java:145） 
 11-08 00：52：43.179 26181-26181 / com.dusandimitrijevic.dontforget E / AndroidRuntime：在android.app.ActivityThread.main（ActivityThread.java:5951) 
 11-08 00:52 ：43.179 26181-26181 / com.dusandimitrijevic.dontforget E / AndroidRuntime：at java.lang.reflect.Method.invoke（Native Method）
 11-08 00：52：43.179 26181-26181 / com.dusandimitrijevic.dontforget E / AndroidRuntime：at java.lang.reflect.Method.invoke（Method.java:372）
 11-08 00:52： 43.179 26181-26181 / com.dusandimitrijevic.dontforget E / AndroidRuntime：at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:1400）
 11-08 00：52：43.179 26181-26181 /com.dusandimitrijevic.dontforget E / AndroidRuntime：at com.android.internal.os.ZygoteInit.main（ZygoteInit.java:1195）

解决方案

1.onItemClick（MainActivity.java:94）
11-08 00：52：43.179 26181-26181 / com.dusandimitrijevic.dontforget E / AndroidRuntime：at adapter.GridAdapter

MyViewHolder.onClick（GridAdapter.java:43）
11-08 00：52：43.179 26181-26181 / com.dusandimitrijevic.dontforget E / AndroidRuntime：at android.view.View.performClick（View.java ：5197）
11-08 00：52：43.179 26181-26181 / com.dusandimitrijevic.dontforget E / AndroidRuntime：at android.view.View

PerformClick.run（View .java：20926）
11-08 00：52：43.179 26181-26181 / com.dusandimitrijevic.dontforget E / AndroidRuntime：在android.os.Handler.handleCallback（Handler.java:739）
11-08 00：52：43.179 26181-26181 / com.dusandimitrijevic.dontforget E / AndroidRuntime：at android.os.Handler.dispatchMessage（Handler .java：95）
11-08 00：52：43.179 26181-26181 / com.dusandimitrijevic.dontforget E / AndroidRuntime：at android.os.Looper.loop（Looper.java:145）
11 -08 00：52：43.179 26181-26181 / com.dusandimitrijevic.dontforget E / AndroidRuntime：在android.app.ActivityThread.main（ActivityThread.java:5951）
11-08 00：52：43.179 26181-26181 /com.dusandimitrijevic.dontforget E / AndroidRuntime：at java.lang.reflect.Method.invoke（Native Method）
11-08 00：52：43.179 26181-26181 / com.dusandimitrijevic.dontforget E / AndroidRuntime：at java.lang.reflect.Method.invoke（Method.java:372）
11-08 00：52：43.179 26181-26181 / com.dusandimitrijevic.dontforget E / AndroidRuntime：at com.android.internal.os。 ZygoteInit

I'm trying to get data from database and when item is clicked, i would intent to another activity, but with listView i can use method getItemAtPosition() and with recyclerView i don't know what to do. I'm getting an error at this line of code:

Cursor cursorItem = (Cursor) mGridAdapter.getItem(position);

mGridAdapter.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(View view, int position) {
                Toast.makeText(MainActivity.this, "It works!", Toast.LENGTH_SHORT).show();
                Cursor cursorItem = (Cursor) mGridAdapter.getItem(position);
                birthdayId = cursorItem.getInt(cursorItem.getColumnIndex(DBHelper.BIRTHDAY_ID));
                Intent intent = new Intent(MainActivity.this, EditBirthdayActivity.class);
                intent.putExtra(KEY_EXTRA_BIRTHDAY_ID, birthdayId);
                startActivity(intent);
            }
        });

11-08 00:52:43.179 26181-26181/com.dusandimitrijevic.dontforget E/AndroidRuntime: FATAL EXCEPTION: main
11-08 00:52:43.179 26181-26181/com.dusandimitrijevic.dontforget E/AndroidRuntime: Process: com.dusandimitrijevic.dontforget, PID: 26181
11-08 00:52:43.179 26181-26181/com.dusandimitrijevic.dontforget E/AndroidRuntime: java.lang.ClassCastException: model.Birthday cannot be cast to android.database.Cursor
11-08 00:52:43.179 26181-26181/com.dusandimitrijevic.dontforget E/AndroidRuntime:     at com.dusandimitrijevic.dontforget.MainActivity$1.onItemClick(MainActivity.java:94)
11-08 00:52:43.179 26181-26181/com.dusandimitrijevic.dontforget E/AndroidRuntime:     at adapter.GridAdapter$MyViewHolder.onClick(GridAdapter.java:43)
11-08 00:52:43.179 26181-26181/com.dusandimitrijevic.dontforget E/AndroidRuntime:     at android.view.View.performClick(View.java:5197)
11-08 00:52:43.179 26181-26181/com.dusandimitrijevic.dontforget E/AndroidRuntime:     at android.view.View$PerformClick.run(View.java:20926)
11-08 00:52:43.179 26181-26181/com.dusandimitrijevic.dontforget E/AndroidRuntime:     at android.os.Handler.handleCallback(Handler.java:739)
11-08 00:52:43.179 26181-26181/com.dusandimitrijevic.dontforget E/AndroidRuntime:     at android.os.Handler.dispatchMessage(Handler.java:95)
11-08 00:52:43.179 26181-26181/com.dusandimitrijevic.dontforget E/AndroidRuntime:     at android.os.Looper.loop(Looper.java:145)
11-08 00:52:43.179 26181-26181/com.dusandimitrijevic.dontforget E/AndroidRuntime:     at android.app.ActivityThread.main(ActivityThread.java:5951)
11-08 00:52:43.179 26181-26181/com.dusandimitrijevic.dontforget E/AndroidRuntime:     at java.lang.reflect.Method.invoke(Native Method)
11-08 00:52:43.179 26181-26181/com.dusandimitrijevic.dontforget E/AndroidRuntime:     at java.lang.reflect.Method.invoke(Method.java:372)
11-08 00:52:43.179 26181-26181/com.dusandimitrijevic.dontforget E/AndroidRuntime:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1400)
11-08 00:52:43.179 26181-26181/com.dusandimitrijevic.dontforget E/AndroidRuntime:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1195)

解决方案

1.onItemClick(MainActivity.java:94) 11-08 00:52:43.179 26181-26181/com.dusandimitrijevic.dontforget E/AndroidRuntime: at adapter.GridAdapter

MyViewHolder.onClick(GridAdapter.java:43) 11-08 00:52:43.179 26181-26181/com.dusandimitrijevic.dontforget E/AndroidRuntime: at android.view.View.performClick(View.java:5197) 11-08 00:52:43.179 26181-26181/com.dusandimitrijevic.dontforget E/AndroidRuntime: at android.view.View

PerformClick.run(View.java:20926) 11-08 00:52:43.179 26181-26181/com.dusandimitrijevic.dontforget E/AndroidRuntime: at android.os.Handler.handleCallback(Handler.java:739) 11-08 00:52:43.179 26181-26181/com.dusandimitrijevic.dontforget E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:95) 11-08 00:52:43.179 26181-26181/com.dusandimitrijevic.dontforget E/AndroidRuntime: at android.os.Looper.loop(Looper.java:145) 11-08 00:52:43.179 26181-26181/com.dusandimitrijevic.dontforget E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:5951) 11-08 00:52:43.179 26181-26181/com.dusandimitrijevic.dontforget E/AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method) 11-08 00:52:43.179 26181-26181/com.dusandimitrijevic.dontforget E/AndroidRuntime: at java.lang.reflect.Method.invoke(Method.java:372) 11-08 00:52:43.179 26181-26181/com.dusandimitrijevic.dontforget E/AndroidRuntime: at com.android.internal.os.ZygoteInit

这篇关于如何在recyclerView适配器中使用getItemAtPosition（）？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！