android.textiview.settextcolor失效的问题

本文详细阐述了在Android开发中正确使用getResources().getColor()方法设置TextView颜色的方法,避免了直接使用颜色资源ID的常见错误,提供了清晰的示例和最佳实践。
使用textview.setColor(getResources().getColor(R.color.xxx))不要使用textview.setColor(R.color.xxx)
为什么一开始不显示文字,点击后才显示文字package com.example.bulbpage.editpreset import android.content.res.ColorStateList import android.graphics.Color import androidx.fragment.app.viewModels import android.os.Bundle import android.util.Log import androidx.fragment.app.Fragment import android.view.LayoutInflater import android.view.View import android.view.ViewGroup import android.widget.Button import androidx.core.content.ContextCompat import com.example.bulbpage.R import com.example.bulbpage.databinding.FragmentEditPresetBinding class EditPresetFragment : Fragment() { private var _binding: FragmentEditPresetBinding? = null private val binding get() = _binding!! override fun onCreateView( inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle? ): View { _binding = FragmentEditPresetBinding.inflate(inflater, container, false) return binding.root } override fun onViewCreated(view: View, savedInstanceState: Bundle?) { super.onViewCreated(view, savedInstanceState) // 默认选中 A binding.buttonA.isChecked = true binding.optionGroup.addOnButtonCheckedListener { group, checkedId, isChecked -> if (!isChecked) return@addOnButtonCheckedListener when (checkedId) { R.id.buttonA -> { Log.d("Click", "ClickA") binding.buttonA.backgroundTintList = ColorStateList.valueOf( ContextCompat.getColor(requireContext(), R.color.skyblue) ) binding.buttonA.setTextColor(Color.WHITE) binding.buttonB.backgroundTintList = ColorStateList.valueOf(Color.WHITE) binding.buttonB.setTextColor(Color.BLACK) } R.id.buttonB -> { Log.d("Click", "ClickB") binding.buttonB.backgroundTintList = ColorStateList.valueOf( ContextCompat.getColor(requireContext(), R.color.skyblue) ) binding.buttonB.setTextColor(Color.WHITE) binding.buttonA.backgroundTintList = ColorStateList.valueOf(Color.WHITE) binding.buttonA.setTextColor(Color.BLACK) } } } } override fun onDestroyView() { super.onDestroyView() _binding = null } }<?xml version="1.0" encoding="utf-8"?> <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" xmlns:app="http://schemas.android.com/apk/res-auto" tools:context=".editpreset.EditPresetFragment"> <ImageView android:id="@+id/imageView3" android:layout_width="24dp" android:layout_height="24dp" android:scaleType="centerInside" android:src="@drawable/close" android:layout_marginStart="16dp" app:layout_constraintBottom_toBottomOf="@+id/edit_auto_white" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="@+id/edit_auto_white" /> <TextView android:id="@+id/edit_auto_white" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="16dp" android:text="Edit Auto White" android:textSize="20dp" app:layout_constraintStart_toEndOf="@+id/imageView3" app:layout_constraintTop_toTopOf="parent"> </TextView> <ImageView android:layout_width="24dp" android:layout_height="24dp" android:scaleType="centerInside" android:src="@drawable/ok" android:layout_marginEnd="16dp" app:layout_constraintBottom_toBottomOf="@+id/edit_auto_white" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintTop_toTopOf="@+id/edit_auto_white" app:layout_constraintVertical_bias="1.0" /> <!-- res/layout/fragment_tab_selector.xml --> <androidx.cardview.widget.CardView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="16dp" app:cardCornerRadius="50dp" app:cardElevation="4dp" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toBottomOf="@+id/edit_auto_white"> <com.google.android.material.button.MaterialButtonToggleGroup android:id="@+id/optionGroup" android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="horizontal" app:selectionRequired="true"> <com.google.android.material.button.MaterialButton android:id="@+id/buttonA" android:layout_width="120dp" android:layout_height="48dp" android:text="A" android:checkable="true" android:checked="true" app:backgroundTint="@android:color/white" app:rippleColor="@android:color/transparent" /> <com.google.android.material.button.MaterialButton android:id="@+id/buttonB" android:layout_width="120dp" android:layout_height="48dp" android:text="B" android:checkable="true" app:backgroundTint="@android:color/white" app:rippleColor="@android:color/transparent" /> </com.google.android.material.button.MaterialButtonToggleGroup> </androidx.cardview.widget.CardView> </androidx.constraintlayout.widget.ConstraintLayout>
08-26
<?xml version="1.0" encoding="utf-8"?> <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" xmlns:app="http://schemas.android.com/apk/res-auto" tools:context=".editpreset.EditPresetFragment"> <ImageView android:id="@+id/imageView3" android:layout_width="24dp" android:layout_height="24dp" android:scaleType="centerInside" android:src="@drawable/close" android:layout_marginStart="16dp" app:layout_constraintBottom_toBottomOf="@+id/edit_auto_white" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="@+id/edit_auto_white" /> <TextView android:id="@+id/edit_auto_white" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="16dp" android:text="Edit Auto White" android:textSize="20dp" app:layout_constraintStart_toEndOf="@+id/imageView3" app:layout_constraintTop_toTopOf="parent"> </TextView> <ImageView android:layout_width="24dp" android:layout_height="24dp" android:scaleType="centerInside" android:src="@drawable/ok" android:layout_marginEnd="16dp" app:layout_constraintBottom_toBottomOf="@+id/edit_auto_white" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintTop_toTopOf="@+id/edit_auto_white" app:layout_constraintVertical_bias="1.0" /> <!-- res/layout/fragment_tab_selector.xml --> <androidx.cardview.widget.CardView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="16dp" app:cardCornerRadius="50dp" app:cardElevation="4dp" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toBottomOf="@+id/edit_auto_white"> <com.google.android.material.button.MaterialButtonToggleGroup android:id="@+id/optionGroup" android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="horizontal" app:selectionRequired="true"> <com.google.android.material.button.MaterialButton android:id="@+id/buttonA" android:layout_width="120dp" android:layout_height="48dp" android:text="A" android:checkable="true" android:checked="true" app:backgroundTint="@android:color/white" app:rippleColor="@android:color/transparent" /> <com.google.android.material.button.MaterialButton android:id="@+id/buttonB" android:layout_width="120dp" android:layout_height="48dp" android:text="B" android:checkable="true" app:backgroundTint="@android:color/white" app:rippleColor="@android:color/transparent" /> </com.google.android.material.button.MaterialButtonToggleGroup> </androidx.cardview.widget.CardView> </androidx.constraintlayout.widget.ConstraintLayout>package com.example.bulbpage.editpreset import android.content.res.ColorStateList import android.graphics.Color import androidx.fragment.app.viewModels import android.os.Bundle import android.util.Log import androidx.fragment.app.Fragment import android.view.LayoutInflater import android.view.View import android.view.ViewGroup import android.widget.Button import androidx.core.content.ContextCompat import com.example.bulbpage.R import com.example.bulbpage.databinding.FragmentEditPresetBinding class EditPresetFragment : Fragment() { private var _binding: FragmentEditPresetBinding? = null private val binding get() = _binding!! override fun onCreateView( inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle? ): View { _binding = FragmentEditPresetBinding.inflate(inflater, container, false) return binding.root } override fun onViewCreated(view: View, savedInstanceState: Bundle?) { super.onViewCreated(view, savedInstanceState) // 默认选中 A binding.buttonA.isChecked = true binding.optionGroup.addOnButtonCheckedListener { group, checkedId, isChecked -> if (!isChecked) return@addOnButtonCheckedListener when (checkedId) { R.id.buttonA -> { Log.d("Click", "ClickA") binding.buttonA.backgroundTintList = ColorStateList.valueOf( ContextCompat.getColor(requireContext(), R.color.skyblue) ) binding.buttonA.setTextColor(Color.WHITE) binding.buttonB.backgroundTintList = ColorStateList.valueOf(Color.WHITE) binding.buttonB.setTextColor(Color.BLACK) } R.id.buttonB -> { Log.d("Click", "ClickB") binding.buttonB.backgroundTintList = ColorStateList.valueOf( ContextCompat.getColor(requireContext(), R.color.skyblue) ) binding.buttonB.setTextColor(Color.WHITE) binding.buttonA.backgroundTintList = ColorStateList.valueOf(Color.WHITE) binding.buttonA.setTextColor(Color.BLACK) } } } } override fun onDestroyView() { super.onDestroyView() _binding = null } }点击两次才生效
08-26
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