回答編集履歴
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具体的な呼び出し方を明記しました
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@@ -11,3 +11,55 @@
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こちらが`getApplicationContext()`の[ドキュメント](https://developer.android.com/reference/android/content/Context.html#getApplicationContext())ですが、以下のように`Activity`や`Fragment`のライフサイクルに関わらず、アプリ自体のプロセスに関わるものにだけ使ってねと書いてあります。
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> This generally should only be used if you need a Context whose lifecycle is separate from the current context, that is tied to the lifetime of the process rather than the current component.
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## Adapter側
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```java
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class MyAdapter extends RecyclerView.Adapter {
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private Context context;
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public MyAdapter(Context context) {
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this.context = context;
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}
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@Override
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public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
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// contextを使う
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}
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}
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```
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## 呼び出し側
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```java
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class MyActivity extends AppCompatActivity {
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@Override
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protected void onCreate(@Nullable Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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MyAdapter adapter = new MyAdapter(this);
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}
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}
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```
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