我是 Android 開發新手，并從 Android Studio 創建了一個新項目，其中包含 Kotlin 中的底部導航活動。此外MainActivity.kt，還生成了儀表板、主頁和通知片段及其 ViewModel。當我處理 MainActivity 類中的按鈕單擊時，一切正常。class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) val navView: BottomNavigationView = findViewById(R.id.nav_view) val navController = findNavController(R.id.nav_host_fragment) // Passing each menu ID as a set of Ids because each // menu should be considered as top level destinations. val appBarConfiguration = AppBarConfiguration(setOf( R.id.navigation_home, R.id.navigation_dashboard, R.id.navigation_notifications)) setupActionBarWithNavController(navController, appBarConfiguration) navView.setupWithNavController(navController) //handle button click val temporary_button = findViewById<Button>(R.id.temporary_button) temporary_button.setOnClickListener{ makeText(this, "You clicked the button", LENGTH_LONG).show() } }}這是工作按鈕的屏幕截圖 按鈕工作正常但是我不明白如何使用不同片段內的按鈕。我嘗試為儀表板片段第二個按鈕的屏幕截圖中的第二個按鈕創建功能，但我還沒有找到解決方案。我努力了
3 回答
慕少森
TA貢獻2019條經驗 獲得超9個贊
這就是我最終的結果：
class DashboardFragment : Fragment() {
private lateinit var dashboardViewModel: DashboardViewModel
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
dashboardViewModel =
ViewModelProviders.of(this).get(DashboardViewModel::class.java)
val root = inflater.inflate(R.layout.fragment_dashboard, container, false)
val textView: TextView = root.findViewById(R.id.text_dashboard)
dashboardViewModel.text.observe(this, Observer {
textView.text = it
})
val button2 : Button = root.findViewById<Button>(R.id.temporary_button2)
button2.setOnClickListener{
println("clicked button 2")
Toast.makeText(view?.context, "Button Clicked", Toast.LENGTH_LONG).show()
}
return root
}
}
月關寶盒
TA貢獻1772條經驗 獲得超5個贊
片段中沒有findViewById，通常在片段內您應該重寫該onCreateView方法，膨脹您自己的布局并嘗試從您膨脹的視圖中獲取視圖。例如 ：
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
if (mContentView == null){
mContentView = inflater.inflate(R.layout.family_fragment_scene_list, container, false);
}
type = getArguments().getInt(ARGS_KEY_TYPE);
adapter = new SceneAdapter(getContext());
// get views from mContentView
mSceneList = (RecyclerView) mContentView.findViewById(R.id.swipe_target);
mSceneList.setLayoutManager(new LinearLayoutManager(getContext()));
mSceneList.setAdapter(adapter);
return mContentView;
}
神不在的星期二
TA貢獻1963條經驗 獲得超6個贊
使用 getView()/view 嘗試內部 onViewCreated 而不是 onCreateView。
例如。：
override fun onViewCreated(view: View?, savedInstanceState: Bundle?) {
val temporary_button = getView().findViewById<Button>(R.id.temporary_button2)
temporary_button2.setOnClickListener{
makeText(this, "You clicked the button", LENGTH_LONG).show()
}
}
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