Caused by: java.lang.NullPointerException: Attempt to invoke virtual method ‘android.view.View andro

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我是靠谱客的博主默默画笔，这篇文章主要介绍Caused by: java.lang.NullPointerException: Attempt to invoke virtual method ‘android.view.View andro，现在分享给大家，希望可以做个参考。

日常的出错记录，原因是之前把activity转化成了fragment

转回activity时忘记更改部分代码

错误代码

复制代码

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public class notepad extends AppCompatActivity {
ListView listView;
List<NotepadBean> list;
SQLiteHelper mSQLiteHelper;
NotepadAdapter adapter;
View view;
public void onCreate( Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_notepad);
listView = (ListView)view.findViewById(R.id.listview);
ImageView add= (ImageView)view.findViewById(R.id.add);

更改后的代码

复制代码

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public class notepad extends AppCompatActivity {
ListView listView;
List<NotepadBean> list;
SQLiteHelper mSQLiteHelper;
NotepadAdapter adapter;
public void onCreate( Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_notepad);
listView = (ListView)findViewById(R.id.listview);
ImageView add= (ImageView)findViewById(R.id.add);

要记得去掉加上的view