[英]How do i display my database using recyclerview in android studio?
[英]how to display data using RecyclerView in Android Studio?
我想使用 RecyclerView 顯示數據。 但有一個問題: "java.lang.NullPointerException: Attempt to invoke virtual method 'void androidx.recyclerview.widget.RecyclerView.setLayoutManager(androidx.recyclerview.widget.RecyclerView$LayoutManager)' on a null object reference"
而這個例外
"java.lang.NullPointerException: Attempt to invoke virtual method 'void androidx.recyclerview.widget.RecyclerView.setLayoutManager(androidx.recyclerview.widget.RecyclerView$LayoutManager)' on a null object reference"
(ViewActivity.java:45)
這段代碼
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_view);
ButterKnife.bind(this);
viewAdapter = new RecyclerViewAdapter(this, perusahaan);
RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext());
recyclerView.setLayoutManager(mLayoutManager);
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.setAdapter(viewAdapter);
LoadDataPerusahaan();
}
這個問題是為了初始化recyclerview
,你可以再次檢查ButterKnife
以確保正常工作。
我想使用RecyclerView顯示數據。 但有一個問題: "java.lang.NullPointerException: Attempt to invoke virtual method 'void androidx.recyclerview.widget.RecyclerView.setLayoutManager(androidx.recyclerview.widget.RecyclerView$LayoutManager)' on a null object reference"
和這個例外
"java.lang.NullPointerException: Attempt to invoke virtual method 'void androidx.recyclerview.widget.RecyclerView.setLayoutManager(androidx.recyclerview.widget.RecyclerView$LayoutManager)' on a null object reference"
(ViewActivity.java:45)
此代碼
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_view);
ButterKnife.bind(this);
viewAdapter = new RecyclerViewAdapter(this, perusahaan);
RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext());
recyclerView.setLayoutManager(mLayoutManager);
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.setAdapter(viewAdapter);
LoadDataPerusahaan();
}
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