你好！
我試圖在片段中添加一個串列視圖，但它不接受 getApplicationContext：
adapter = new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_list_item_1, arrayList);
還有這個：
Toast.makeText(Todo.this, "" parent.getItemAtPosition(position), Toast.LENGTH_SHORT).show();
如何使其適用于片段而不是活動？
代碼：
public class Todo extends Fragment {
EditText editText;
Button button;
ListView listView;
ArrayList<String> arrayList;
ArrayAdapter<String> adapter;
public Todo() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.todo, container, false);
editText = editText.findViewById(R.id.editText);
button = button.findViewById(R.id.button2);
listView = listView.findViewById(R.id.list);
arrayList = new ArrayList<>();
adapter = new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_list_item_1, arrayList);
listView.setAdapter(adapter);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String YeniVeri = editText.getText() .toString();
arrayList.add(YeniVeri);
adapter.notifyDataSetChanged();
editText.setText("");
}
});
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Toast.makeText(Todo.this, "" parent.getItemAtPosition(position), Toast.LENGTH_SHORT).show();
}
});
// Inflate the layout for this fragment
return view;
}
}
uj5u.com熱心網友回復：
使用 requireActivity() 而不是 getApplicationContext 和 "ActivityName.this"
uj5u.com熱心網友回復：
您可以在 onCreatView中使用requireActivity()或。container.context所以你也可以通過容器訪問“contex”。經驗（科特林）：
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
var mContext:Context? = container.context
轉載請註明出處，本文鏈接：https://www.uj5u.com/qiye/411094.html
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