在 TextInputLayout 中垂直居中提示和 EditText

Question

我正在使用 TextInputLayout 来显示提示，但我无法将其垂直居中。我总是这样：

当 EditText / TextInputEditText 中没有文本时，我想将提示垂直居中。我已经尝试了基本的想法（重力，layout_gravity，等等）。到目前为止，唯一的方法是添加一些 "magic" 填充，但我想以更简洁的方式进行。我正在考虑测量顶部提示标签的高度并在它不可见时将其添加为底部边距，并在它可见时删除相同的边距，但我还不太了解 TextInputLayout 源代码.有人知道怎么做吗？

编辑：

我尝试了这个建议的答案：

<android.support.design.widget.TextInputLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="20dp"
    android:background="@color/grey_strong">

    <android.support.design.widget.TextInputEditText
        android:layout_width="match_parent"
        android:layout_height="90dp"
        android:background="@color/red_light"
        android:gravity="center_vertical"
        android:hint="Test"/>

</android.support.design.widget.TextInputLayout>

我明白了：

"big" 提示仍然没有垂直居中。它有点低于中心，因为 "small" 提示（在灰色背景中，在顶部，仅当字段聚焦时可见）在顶部占据一些 space 并推动 EditText .

Answer 1

找到解决方案：

    <android.support.design.widget.TextInputLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">

    <android.support.design.widget.TextInputEditText
        android:layout_width="200dp"
        android:layout_height="90dp"
        android:hint="Test"
        android:gravity="center_vertical" />

90dp 作为高度只是一个例子。如果您可以提供 xml，我可以根据您的情况进行调整。你只需要设置 android:gravity="center_vertical" 并且 TextInputLayout 应该有 wrap_content 作为高度

希望对您有所帮助:)

Answer 2

请使用此代码如果你想在中心显示 EditText 提示

<android.support.design.widget.TextInputLayout android:layout_width="match_parent"
android:layout_height="wrap_content"
xmlns:android="http://schemas.android.com/apk/res/android">

<android.support.design.widget.TextInputEditText
    android:layout_width="match_parent"
    android:layout_height="90dp"
    android:hint="Test"
    android:gravity="center" />

如果要在垂直居中和左对齐中显示 EditText 提示

<android.support.design.widget.TextInputLayout android:layout_width="match_parent"
android:layout_height="wrap_content"
xmlns:android="http://schemas.android.com/apk/res/android">

<android.support.design.widget.TextInputEditText
    android:layout_width="match_parent"
    android:layout_height="90dp"
    android:hint="Test"
    android:gravity="center_vertical" />

或

<android.support.design.widget.TextInputLayout android:layout_width="match_parent"
android:layout_height="wrap_content"
xmlns:android="http://schemas.android.com/apk/res/android">

<android.support.design.widget.TextInputEditText
    android:layout_width="match_parent"
    android:layout_height="90dp"
    android:hint="Test"
    android:gravity="center|left" />

Answer 3

TextInputLayout 的当前实施似乎无法做到这一点。但是你可以通过 TextInputEditText.

的填充来实现你想要的

假设您有一个 TextInputLayout 和一个 TextInputEditText，如下所示：

<android.support.design.widget.TextInputLayout
    android:id="@+id/text_input_layout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="#FAA"
    android:hint="Text hint">

    <android.support.design.widget.TextInputEditText
        android:id="@+id/text_input_edit_text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#AAF" />

</android.support.design.widget.TextInputLayout>

如您所见，TextInputLayout 由顶部区域组成，用于保存小版本的提示和底部区域，用于保存大版本的提示（以及输入内容）。当视图失去焦点并且编辑文本为空时，提示在蓝色 space 内移动。另一方面，当视图获得焦点或编辑文本中有一些文本时，提示将移至红色 space.

所以我们要做的是：

当TextInputEditText里面没有焦点和文字时，在底部添加一个额外的padding，这个padding等于红色区域的高度；
当 TextInputEditText 中有焦点或文本时删除此填充。

因此，视图将如下所示，大提示垂直居中：

假设您按如下方式检索您的观点：

private lateinit var textInputLayout: TextInputLayout
private lateinit var textInputEditText: TextInputEditText

override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
    ...
    textInputLayout = view.findViewById(R.id.text_input_layout)
    textInputEditText = view.findViewById(R.id.text_input_edit_text)
    ...
}

这是一个实现示例，您可以使用它来计算顶部红色 space（以像素为单位）。

private fun getTextInputLayoutTopSpace(): Int {
    var currentView: View = textInputEditText
    var space = 0
    do {
        space += currentView.top
        currentView = currentView.parent as View
    } while (currentView.id != textInputLayout.id)
    return space
}

然后你可以像这样更新填充：

private fun updateHintPosition(hasFocus: Boolean, hasText: Boolean) {
    if (hasFocus || hasText) {
        textInputEditText.setPadding(0, 0, 0, 0)
    } else {
        textInputEditText.setPadding(0, 0, 0, getTextInputLayoutTopSpace())
    }
}

现在你必须在两个地方调用这个方法：创建视图时（实际上我们需要等待视图完全测量）和焦点改变时。

textInputLayout.viewTreeObserver.addOnPreDrawListener(object : ViewTreeObserver.OnPreDrawListener {
    override fun onPreDraw(): Boolean {
        if (textInputLayout.height > 0) {
            textInputLayout.viewTreeObserver.removeOnPreDrawListener(this)
            updateHintPosition(textInputEditText.hasFocus(), !textInputEditText.text.isNullOrEmpty())
            return false
        }
        return true
    }
})

textInputEditText.setOnFocusChangeListener { _, hasFocus ->
    updateHintPosition(hasFocus, !textInputEditText.text.isNullOrEmpty())
}

一个问题是 TextInputLayout 的高度在变化，所以所有的视图都在移动，看起来并不真正居中。您可以通过将 TextInputLayout 放在具有固定高度的 FrameLayout 中并将其垂直居中来解决此问题。

你终于可以让所有的东西都动起来了。更改填充时，您只需使用支持库的 TransitionManager。

你可以在这个link中看到最终结果：https://streamable.com/la9uk

完整的代码如下所示：

布局：

<FrameLayout
    android:layout_width="match_parent"
    android:layout_height="60dp"> <-- Adapt the height for your needs -->

    <android.support.design.widget.TextInputLayout
        android:id="@+id/text_input_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical"
        android:background="#FAA"
        android:hint="Text hint">

        <android.support.design.widget.TextInputEditText
            android:id="@+id/text_input_edit_text"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="#AAF" />

    </android.support.design.widget.TextInputLayout>

</FrameLayout>

代码：

private lateinit var textInputLayout: TextInputLayout
private lateinit var textInputEditText: TextInputEditText

override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
    super.onCreateView(inflater, container, savedInstanceState)
    val view = inflater.inflate(R.layout.your_layout, container, false)

    textInputLayout = view.findViewById(R.id.text_input_layout)
    textInputEditText = view.findViewById(R.id.text_input_edit_text)

    textInputLayout.viewTreeObserver.addOnPreDrawListener(object : ViewTreeObserver.OnPreDrawListener {
        override fun onPreDraw(): Boolean {
            // Wait for the first draw to be sure the view is completely measured
            if (textInputLayout.height > 0) {
                textInputLayout.viewTreeObserver.removeOnPreDrawListener(this)
                updateHintPosition(textInputEditText.hasFocus(), !textInputEditText.text.isNullOrEmpty(), false)
                return false
            }
            return true
        }
    })

    textInputEditText.setOnFocusChangeListener { _, hasFocus ->
        updateHintPosition(hasFocus, !textInputEditText.text.isNullOrEmpty(), true)
    }

    return view
}

private fun updateHintPosition(hasFocus: Boolean, hasText: Boolean, animate: Boolean) {
    if (animate) {
        TransitionManager.beginDelayedTransition(textInputLayout)
    }
    if (hasFocus || hasText) {
        textInputEditText.setPadding(0, 0, 0, 0)
    } else {
        textInputEditText.setPadding(0, 0, 0, getTextInputLayoutTopSpace())
    }
}

private fun getTextInputLayoutTopSpace(): Int {
    var currentView: View = textInputEditText
    var space = 0
    do {
        space += currentView.top
        currentView = currentView.parent as View
    } while (currentView.id != textInputLayout.id)
    return space
}

希望这能解决您的问题。

Answer 4

我在使用主题 "Widget.MaterialComponents.TextInputLayout.FilledBox.Dense" 和密码可见性切换按钮时遇到了这个问题。

所以我最终根据这个问题的答案创建了自定义 class。

之前：后：

自定义 class:

package com.mycompany

import android.content.Context
import android.util.AttributeSet
import android.view.View
import android.view.ViewTreeObserver
import com.google.android.material.textfield.TextInputEditText
import com.google.android.material.textfield.TextInputLayout
import com.mycompany.R

class CustomTextInputEditText : TextInputEditText {
    //region Constructors
    constructor(context: Context) : super(context)
    constructor(context: Context, attrs: AttributeSet) : super(context, attrs)
    constructor(context: Context, attrs: AttributeSet, defStyleAttr: Int) : super(context, attrs, defStyleAttr)
    //endregion

    //region LifeCycle
    override fun onAttachedToWindow() {
        super.onAttachedToWindow()
        textInputEditText.setOnFocusChangeListener { _, hasFocus ->
            updateHintPosition(hasFocus, !textInputEditText.text.isNullOrEmpty())
        }
        textInputEditText.viewTreeObserver.addOnPreDrawListener(object : ViewTreeObserver.OnPreDrawListener {
            override fun onPreDraw(): Boolean {
                if ((textInputLayout?.height ?: 0) > 0) {
                    textInputLayout?.viewTreeObserver?.removeOnPreDrawListener(this)
                    updateHintPosition(textInputEditText.hasFocus(), !textInputEditText.text.isNullOrEmpty())
                    return false
                }
                return true
            }
        })
    }
    //endregion

    //region Center hint
    private var paddingBottomBackup:Int? = null
    private var passwordToggleButtonPaddingBottomBackup:Float? = null
    private val textInputEditText: TextInputEditText
        get() {
            return this
        }
    private val textInputLayout:TextInputLayout?
        get(){
            return if (parent is TextInputLayout) (parent as? TextInputLayout) else (parent?.parent as? TextInputLayout)
        }
    private val passwordToggleButton:View?
        get() {
            return (parent as? View)?.findViewById(R.id.text_input_password_toggle)
        }

    private fun updateHintPosition(hasFocus: Boolean, hasText: Boolean) {
        if (paddingBottomBackup == null)
            paddingBottomBackup = paddingBottom

        if (hasFocus || hasText)
            textInputEditText.setPadding(paddingLeft, paddingTop, paddingRight, paddingBottomBackup!!)
        else
            textInputEditText.setPadding(paddingLeft, paddingTop, paddingRight, paddingBottomBackup!! + getTextInputLayoutTopSpace())

        val button = passwordToggleButton
        if (button != null){
            if (passwordToggleButtonPaddingBottomBackup == null)
                passwordToggleButtonPaddingBottomBackup = button.translationY

            if (hasFocus || hasText)
                button.translationY =  - getTextInputLayoutTopSpace().toFloat() * 0.50f
            else
                button.translationY = passwordToggleButtonPaddingBottomBackup!!
        }
    }

    private fun getTextInputLayoutTopSpace(): Int {
        var currentView: View = textInputEditText
        var space = 0
        do {
            space += currentView.top
            currentView = currentView.parent as View
        } while (currentView !is TextInputLayout)
        return space
    }
    //endregion

    //region Internal classes
    data class Padding(val l: Int, val t: Int, val r: Int, val b: Int)
    //endregion
}

用法：

        <com.google.android.material.textfield.TextInputLayout
            style="@style/Widget.MaterialComponents.TextInputLayout.FilledBox.Dense"
            android:layout_height="wrap_content"
            android:layout_width="match_parent"
            android:hint="Password"
            app:passwordToggleEnabled="true">

            <com.mycompany.CustomTextInputEditText
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:inputType="textPassword" />

        </com.google.android.material.textfield.TextInputLayout>

Answer 5

可能有点晚了但是...基于@JFrite 的回复...您可以创建一个 class 来改进代码：

class TextInputCenterHelper constructor(val textInputLayout: TextInputLayout, val textInputEditText: TextInputEditText){

init {
    textInputLayout.viewTreeObserver.addOnPreDrawListener(object : ViewTreeObserver.OnPreDrawListener {
        override fun onPreDraw(): Boolean {
            if (textInputLayout.height > 0) {
                textInputLayout.viewTreeObserver.removeOnPreDrawListener(this)
                updateHintPosition(textInputEditText.hasFocus(), !textInputEditText.text.isNullOrEmpty(), false)
                return false
            }
            return true
        }
    })

    textInputEditText.setOnFocusChangeListener { _, hasFocus ->
        updateHintPosition(hasFocus, !textInputEditText.text.isNullOrEmpty(), true)
    }
}

private fun updateHintPosition(hasFocus: Boolean, hasText: Boolean, animate: Boolean) {
    if (animate) {
        TransitionManager.beginDelayedTransition(textInputLayout)
    }
    if (hasFocus || hasText) {
        textInputEditText.setPadding(0, 0, 0, 0)
    } else {
        textInputEditText.setPadding(0, 0, 0, getTextInputLayoutTopSpace())
    }
}

private fun getTextInputLayoutTopSpace(): Int {
    var currentView: View = textInputEditText
    var space = 0
    do {
        space += currentView.top
        currentView = currentView.parent as View
    } while (currentView.id != textInputLayout.id)
    return space
}

并使用它：

 TextInputCenterHelper(your_text_input_layout, your_text_input_edit_text)

希望对大家有所帮助！

Answer 6

问题已于 2019 年 4 月 5 日解决。这是提交： https://github.com/material-components/material-components-android/commit/4476564820ff7a12f94ffa7fc8d9e10221b18eb1

您可以使用已解决该错误的最新版本（2020 年 7 月 23 日）。查看变更日志（“TextInputLayout”部分）： https://github.com/material-components/material-components-android/releases/tag/1.3.0-alpha02

只需更新 gradle 中的库：

implementation 'com.google.android.material:material:1.3.0-alpha02'

它对我有用。

Answer 7

我发现此处发布的解决方案存在一些问题，因此再添加一个覆盖基础更好的解决方案：

public class CenteredTextInputEditText extends TextInputEditText {

  private Integer paddingBottomBackup = null;

  // region Constructors
  public CenteredTextInputEditText(Context context) {
    super(context);
  }

  public CenteredTextInputEditText(Context context, AttributeSet attrs) {
    super(context, attrs);
  }

  public CenteredTextInputEditText(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
  }
  // endregion

  // region LifeCycle
  @Override
  protected void onAttachedToWindow() {
    super.onAttachedToWindow();
    if (getOnFocusChangeListener() == null) {
      setOnFocusChangeListener((v, hasFocus) -> updateHintPosition(hasFocus));
    }

    getViewTreeObserver()
        .addOnPreDrawListener(
            new OnPreDrawListener() {
              @Override
              public boolean onPreDraw() {
                if (getHeight() > 0) {
                  getViewTreeObserver().removeOnPreDrawListener(this);
                  updateHintPosition(hasFocus());
                  return false;
                }
                return true;
              }
            });
  }
  // endregion

  // region Center hint
  private void updateHintPosition(boolean hasFocus) {
    boolean hasText = getText() != null && !Strings.isNullOrEmpty(getText().toString());
    if (paddingBottomBackup == null) {
      paddingBottomBackup = getPaddingBottom();
    }

    int bottomPadding = paddingBottomBackup;
    if (!hasFocus && !hasText) {
      bottomPadding += getTextInputTopSpace();
    }
    setPadding(getPaddingLeft(), getPaddingTop(), getPaddingRight(), bottomPadding);

    if (hasFocus) {
      KeyboardUtils.openKeyboardFrom(this);
    }
  }

  private int getTextInputTopSpace() {
    View currentView = this;
    int space = 0;
    do {
      space += currentView.getTop();
      currentView = (View) currentView.getParent();
    } while (!(currentView instanceof TextInputLayout));

    return space;
  }
  // endregion

  public void addAdditionalFocusListener(Consumer<Boolean> consumer) {
    setOnFocusChangeListener(
        new OnFocusChangeListener() {
          @Override
          public void onFocusChange(View v, boolean hasFocus) {
            consumer.accept(hasFocus);
            updateHintPosition(hasFocus);
          }
        });
  }
}

Answer 8

我发现居中 TextInput 布局的最简单方法是在我的 XML 中启用 SetHelperEnabled 或通过编程方式将这些属性插入 TextInputLayout

app:helperTextEnabled="true"
app:helperText=" "

您还可以通过将 paddingTop 添加到内部 EditText

来进一步调整额外的填充

 <androidx.cardview.widget.CardView
    android:id="@+id/cardView2"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:layout_marginStart="16dp"
    android:layout_marginTop="32dp"
    android:layout_marginEnd="32dp"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toEndOf="@+id/textView2"
    app:layout_constraintTop_toBottomOf="@+id/textViewSeekModText">

    <com.google.android.material.textfield.TextInputLayout
        android:layout_width="409dp"
        android:layout_height="wrap_content"
        android:background="#FDFDFD"
        app:helperText=" "
        app:helperTextEnabled="true">

        <com.google.android.material.textfield.TextInputEditText
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@null"
            android:hint="hint" />
    </com.google.android.material.textfield.TextInputLayout>
</androidx.cardview.widget.CardView>

Answer 9

只需在 editText 或其后代中添加 paddingVertical

Answer 10

我知道这不是最好的解决方案，但它确实有效。您只需向“TextInputEditText”添加填充：

android:paddingTop="18dp"
android:paddingBottom="18dp"

完整示例：

<com.google.android.material.textfield.TextInputLayout
        android:id="@+id/inputLoginEmail"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="15dp"
        android:layout_marginEnd="15dp"
        android:layout_marginTop="5dp"
        android:backgroundTint="@color/light_blue_background"
        android:textColor="@color/blue_button"
        app:hintEnabled="false"
        android:layout_gravity="center"
        app:boxStrokeWidth="0dp"
        app:boxStrokeWidthFocused="0dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textLabelEmail"
        app:passwordToggleEnabled="false">

        <com.google.android.material.textfield.TextInputEditText
            android:id="@+id/etLoginEmail"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:backgroundTint="@color/light_blue_background"
            android:hint="@string/hint_email"
            android:inputType="textEmailAddress"
            android:paddingTop="18dp"
            android:paddingBottom="18dp"
            android:maxLines="1"
            android:textColor="@color/blue_button" />
    </com.google.android.material.textfield.TextInputLayout>

它对我来说很完美。

Answer 11

下面是我们可以实现的方法

要使提示居中，请使用app:boxBackgroundMode="filled"
如果要删除编辑文本底线，请使用

            app:boxStrokeWidth="0dp"
            app:boxStrokeWidthFocused="0dp"
            app:boxStrokeColor="@color/white"
            app:boxBackgroundColor="@color/white"

完整代码

           <com.google.android.material.textfield.TextInputLayout
            app:boxBackgroundMode="filled"
            app:boxStrokeWidth="0dp"
            app:boxStrokeWidthFocused="0dp"
            app:boxStrokeColor="@color/white"
            app:boxBackgroundColor="@color/white"
            android:id="@+id/layout_main"
            android:paddingVertical="@dimen/dp_6"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginHorizontal="@dimen/dp_4"
            android:hint="@string/your_hint"
            android:paddingHorizontal="@dimen/dp_16"
            app:layout_constraintTop_toTopOf="parent">

               <com.google.android.material.textfield.TextInputEditText
                android:id="@+id/ed_txt"
                android:inputType="textNoSuggestions"
                android:layout_width="match_parent"
                android:layout_height="?listPreferredItemHeightSmall"
                android:gravity="bottom"
                android:paddingVertical="@dimen/dp_8" />

           </com.google.android.material.textfield.TextInputLayout>

在 TextInputLayout 中垂直居中提示和 EditText

Center hint and EditText vertically in TextInputLayout

android

android-edittext

android-textinputlayout

android-gravity