Question

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

如果EditText / TextInputEditText中没有任何文字，我想垂直显示提示。我尝试过基本的想法（重力，layout_gravity等）。到目前为止，唯一的方法是添加一些“魔术”填充，但我想以更清洁的方式做到这一点。我正在考虑测量顶部提示标签高度，并在它不可见时将其添加为底部边距，并在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：

“大”提示仍未垂直居中。它略低于中心，因为“小”提示（在灰色背景中，在顶部，仅在场聚焦时可见）在顶部占据一些空间并推动EditText。

Answer 1

TextInputLayout的当前实现似乎无法做到这一点。但是你可以通过使用TextInputEditText的填充来实现你想要的效果。

假设你有TextInputLayout和TextInputEditText这样：

<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>

正如您所看到的，TextInputLayout由一个顶部区域组成，用于保存小版本中的提示，一个底部区域用于保存大版本中的提示（以及输入内容）。当视图失去焦点且编辑文本为空时，提示将在蓝色空间内移动。另一方面，当视图获得焦点或编辑文本内部有一些文本时，提示将移动到红色空间。

所以我们想做的是：

在TextInputEditText底部没有焦点和文字时添加额外的填充，此填充等于红色区域高度;
当TextInputEditText内置焦点或文字时删除此填充。

因此，视图将显示为垂直居中的大提示：

假设你按照以下方式检索你的观点：

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)
    ...
}

以下是一个可用于计算顶部红色空间（以像素为单位）的实现示例。

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的高度正在变化，因此所有视图都在移动，并且它看起来并不真正居中。您可以通过将TextInputLayout置于FrameLayout内并固定高度并将其垂直居中来解决此问题。

最后，你可以动画所有的东西。更改填充时，您只需使用支持库的TransitionManager。

您可以在此链接中看到最终结果：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
}

我希望这能解决你的问题。

Answer 2

请使用此代码如果要在Center

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" />

如果要在垂直居中显示EditText提示以及左对齐

<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

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作为高度就是一个例子。如果你能提供你的xml，我可以根据你的情况进行调整。您只需设置android:gravity="center_vertical"，TextInputLayout应该wrap_content作为身高

希望有所帮助：）

Answer 4

当我使用主题"Widget.MaterialComponents.TextInputLayout.FilledBox.Dense"和密码可见性切换按钮时，我遇到了这个问题。

所以我最终根据这个问题的答案创建了自定义类。

之前：后：

自定义类别：

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

也许有点晚了，但是...基于@JFrite答复...您可以创建一个类来改进代码：

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)

我希望这可以帮助某人！

Answer 6

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

您可以使用已解决错误的最新版本（2020年7月23日）。看一下changelog（“ TextInputLayout”部分）： https://github.com/material-components/material-components-android/releases/tag/1.3.0-alpha02

只需更新您的gradle中的库即可：

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

对我有用。

Answer 7

我发现此处发布的解决方案存在一些问题，因此增加了一个涵盖基础的问题：

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

我发现以TextInput Layout为中心的最简单方法是仅在XML中启用SetHelperEnabled或通过在TextInputLayout中以编程方式插入这些属性

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

您还可以通过在内部EditText中添加paddingTop来进一步调整多余的填充

 <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

这是我们如何实现

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>

Answer 11

我知道这不是最好的解决方案，但它有效。您只需要向“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>

它对我来说非常好。

TextInputLayout

11 个答案: