我是 Android 開(kāi)發(fā)新手，并從 Android Studio 創(chuàng)建了一個(gè)新項(xiàng)目，其中包含 Kotlin 中的底部導(dǎo)航活動(dòng)。此外MainActivity.kt，還生成了儀表板、主頁(yè)和通知片段及其 ViewModel。當(dāng)我處理 MainActivity 類(lèi)中的按鈕單擊時(shí)，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(nèi)的按鈕。我嘗試為儀表板片段第二個(gè)按鈕的屏幕截圖中的第二個(gè)按鈕創(chuàng)建功能，但我還沒(méi)有找到解決方案。我努力了
3 回答
慕少森
TA貢獻(xiàn)2019條經(jīng)驗(yàn) 獲得超9個(gè)贊
這就是我最終的結(jié)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(guān)寶盒
TA貢獻(xiàn)1772條經(jīng)驗(yàn) 獲得超5個(gè)贊
片段中沒(méi)有findViewById，通常在片段內(nèi)您應(yīng)該重寫(xiě)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(xiàn)1963條經(jīng)驗(yàn) 獲得超6個(gè)贊
使用 getView()/view 嘗試內(nèi)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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