如何将 Material 组件库中的芯片添加到 android 中的输入字段？

Question

我看到在 android-P google 中添加了新的 material 组件库，其中包含 material 芯片：

所以我决定将 material 输入芯片添加到我的项目中，但遗憾的是没有找到任何制作教程。我想创建类似 Gmail 芯片的东西，但一开始没有图像。

因为我正在使用 appcompat 库，所以我尝试使用 android.support.design.chip.Chip 和 android.support.design.chip.ChipGroup 的 material 芯片。但结果只是没有任何输入字段的芯片。我还尝试创建一个独立的 ChipDrawable，然后使用

将其添加到 EditText

Editable text = editText.getText();

text.setSpan(span, 0, text.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

但是我得到的是没有任何筹码的空 EditText。那么我如何使用这个 material 组件库像在 Gmail 中一样创建 chips 输入呢？也许有人有经验或知道我可以看到如何创建它的任何教程？

提前致谢！

Answer 1

回答

android 中没有用于添加筹码的默认输入字段。他们提到了输入芯片，但我没有找到输入芯片的任何布局或视图组。所以我用 Chipdrawable 方法在 edittext 中添加筹码。这里使用的是 AppCompatEdittext 你可以切换到任何监听文本输入的视图。 Reference.

步骤 1

添加芯片 xml 资源。 chip.xml

res -> xml -> chip.xml

<?xml version="1.0" encoding="utf-8"?>
<chip xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:app="http://schemas.android.com/apk/res-auto"
 android:textAppearance="@style/ChipTextAppearance"
 app:chipBackgroundColor="@color/colorAccent"
 app:chipIcon="@drawable/ic_call_white_24dp"
 app:closeIconEnabled="true"  <!--property for close icon if no need set to false. -->
 app:closeIconTint="@android:color/white" />

然后在style.xml中添加textappearance样式（用于更改textStyle）

<style name="ChipTextAppearance" parent="TextAppearance.MaterialComponents.Chip">
    <item name="android:textColor">@android:color/white</item>
</style>

步骤 2

在此处使用 AppCompatEdittext 添加您的视图

  <android.support.v7.widget.AppCompatEditText
    android:id="@+id/phone"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:layout_marginEnd="8dp"
    android:layout_marginLeft="8dp"
    android:layout_marginRight="8dp"
    android:layout_marginStart="8dp"
    android:layout_marginTop="8dp"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/tvt_Contact" />

步骤 3
将此代码添加到您的视图以获得所需的行为。

 private int SpannedLength = 0,chipLength = 4;

 AppCompatEditText Phone = findViewById(R.id.phone);

 Phone.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

        }

        @Override
        public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
            if (charSequence.length() == SpannedLength - chipLength)
            {
                SpannedLength = charSequence.length();
            }
        }

        @Override
        public void afterTextChanged(Editable editable) {

            if(editable.length() - SpannedLength == chipLength) {
                ChipDrawable chip = ChipDrawable.createFromResource(getContext(), R.xml.chip);
                chip.setChipText(editable.subSequence(SpannedLength,editable.length()));
                chip.setBounds(0, 0, chip.getIntrinsicWidth(), chip.getIntrinsicHeight());
                ImageSpan span = new ImageSpan(chip);
                editable.setSpan(span, SpannedLength, editable.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
                SpannedLength = editable.length();
            }

        }
    });

当需要在edittext中添加新芯片时，根据需要更改chipLength。

输出

已编辑

您可以找到有关如何将文本居中对齐的更多信息 Here。

我在这里添加了一些代码，解决方案将为您修复..

public class VerticalImageSpan extends ImageSpan {

public VerticalImageSpan(Drawable drawable) {
    super(drawable);
}

@Override
public int getSize(@NonNull Paint paint, CharSequence text, int start, int end,
                   Paint.FontMetricsInt fontMetricsInt) {
    Drawable drawable = getDrawable();
    Rect rect = drawable.getBounds();
    if (fontMetricsInt != null) {
        Paint.FontMetricsInt fmPaint = paint.getFontMetricsInt();
        int fontHeight = fmPaint.descent - fmPaint.ascent;
        int drHeight = rect.bottom - rect.top;
        int centerY = fmPaint.ascent + fontHeight / 2;

        fontMetricsInt.ascent = centerY - drHeight / 2;
        fontMetricsInt.top = fontMetricsInt.ascent;
        fontMetricsInt.bottom = centerY + drHeight / 2;
        fontMetricsInt.descent = fontMetricsInt.bottom;
    }
    return rect.right;
}

@Override
public void draw(@NonNull Canvas canvas, CharSequence text, int start, int end,
                 float x, int top, int y, int bottom, @NonNull Paint paint) {

    Drawable drawable = getDrawable();
    canvas.save();
    Paint.FontMetricsInt fmPaint = paint.getFontMetricsInt();
    int fontHeight = fmPaint.descent - fmPaint.ascent;
    int centerY = y + fmPaint.descent - fontHeight / 2;
    int transY = centerY - (drawable.getBounds().bottom - drawable.getBounds().top) / 2;
    canvas.translate(x, transY);
    drawable.draw(canvas);
    canvas.restore();
}

}

并像下面这样更改图像跨度 class

VerticalImageSpan span = new VerticalImageSpan(chip);

Answer 2

我们可以通过使用 material chips 设计本身来做到这一点，而无需添加任何额外的样式。

将其添加到应用程序 gradle 对于 AndroidX

implementation 'com.google.android.material:material:1.0.0-beta01'

AndroidX 之前使用这个

implementation 'com.android.support:design:28.0.0'

片段

class EntryChipDemoFragment : Fragment() {
    private lateinit var mView: View

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
                              savedInstanceState: Bundle?): View? {
        mView = inflater.inflate(R.layout.fragment_entry_chip_demo, container, false)

        mView.etValue.setOnEditorActionListener(TextView.OnEditorActionListener { v, actionId, _ ->
            if (actionId == EditorInfo.IME_ACTION_DONE) {
                val txtVal = v.text
                if(!txtVal.isNullOrEmpty()) {
                    addChipToGroup(txtVal.toString(), mView.chipGroup2)
                    mView.etValue.setText("")
                }

                return@OnEditorActionListener true
            }
            false
        })

        return mView
    }


    private fun addChipToGroup(txt: String, chipGroup: ChipGroup) {
        val chip = Chip(context)
        chip.text = txt
//        chip.chipIcon = ContextCompat.getDrawable(requireContext(), baseline_person_black_18)
        chip.isCloseIconEnabled = true
        chip.setChipIconTintResource(R.color.chipIconTint)

        // necessary to get single selection working
        chip.isClickable = false
        chip.isCheckable = false
        chipGroup.addView(chip as View)
        chip.setOnCloseIconClickListener { chipGroup.removeView(chip as View) }
        printChipsValue(chipGroup)
    }

    private fun printChipsValue(chipGroup: ChipGroup) {
        for (i in 0 until chipGroup.childCount) {
            val chipObj = chipGroup.getChildAt(i) as Chip
            Log.d("Chips text :: " , chipObj.text.toString())

        }
    }

    companion object {
        @JvmStatic
        fun newInstance() = EntryChipDemoFragment()
    }
}

XML 文件:

<HorizontalScrollView
    android:id="@+id/chipGroup2HorizontalView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginStart="8dp"
    android:layout_marginTop="16dp"
    android:scrollbars="none"
    app:layout_constraintVertical_bias="0.62">

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center_vertical"
        android:orientation="horizontal">

        <androidx.appcompat.widget.AppCompatTextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Skills: " />

        <com.google.android.material.chip.ChipGroup
            android:id="@+id/chipGroup2"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:duplicateParentState="false">

        </com.google.android.material.chip.ChipGroup>

        <com.google.android.material.textfield.TextInputLayout
            android:id="@+id/textInputLayout"
            android:layout_width="wrap_content"
            android:layout_height="43dp"
            android:layout_marginStart="8dp"
            android:layout_marginEnd="8dp"
            android:layout_marginBottom="5dp"
            android:minWidth="32dp"
            android:visibility="visible"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toEndOf="@id/chipGroup2HorizontalView"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintWidth_min="32dp">

            <androidx.appcompat.widget.AppCompatEditText
                android:id="@+id/etValue"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:background="@android:color/transparent"
                android:imeOptions="actionDone"
                android:maxLines="1"
                android:singleLine="true" />

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

    </LinearLayout>


</HorizontalScrollView>

更多参考Click Here

Answer 3

可以使用material芯片"com.google.android.material.chip.Chip"和"implementation 'com.google.android.material:material:1.0.0' "加入build.gradle

过滤器 style="@style/Widget.MaterialComponents.Chip.Filter"

选择筹码 style="@style/Widget.MaterialComponents.Chip.Choice"

条目输入： style="@style/Widget.MaterialComponents.Chip.Entry"

Answer 4

如果你想在多行上实现类似 gmail 的行为，那么所有以前的解决方案都不适合我。为了做到这一点，我不得不避免使用 ChipGroup，而是使用 FlexboxLayout.

your_recipient_layout:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal">

    <TextView
        android:id="@+id/recipient_label_TV"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginEnd="8dp"
        android:layout_gravity="center_vertical" />

    <com.google.android.flexbox.FlexboxLayout
        android:id="@+id/recipient_group_FL"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_gravity="center_vertical"
        app:flexWrap="wrap"
        app:alignItems="stretch"
        app:alignContent="space_around"
        app:showDivider="beginning|middle|end"
        app:dividerDrawable="@drawable/divider">

        <EditText
            android:id="@+id/recipient_input_ET"
            android:layout_width="wrap_content"
            android:layout_height="32dp"
            app:layout_flexGrow="1"
            android:background="@android:color/transparent"
            android:imeOptions="actionDone"
            android:inputType="text"/>

    </com.google.android.flexbox.FlexboxLayout>

</LinearLayout>

<androidx.recyclerview.widget.RecyclerView
    android:id="@+id/recipients_list_RV"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:visibility="gone" />

现在的诀窍是向组中添加一个新筹码，但要放在倒数第二个位置。像这样：

private fun addNewChip(person: String, chipGroup: FlexboxLayout) {
    val chip = Chip(context)
    chip.text = person
    chip.chipIcon = ContextCompat.getDrawable(requireContext(), R.mipmap.ic_launcher_round)
    chip.isCloseIconEnabled = true
    chip.isClickable = true
    chip.isCheckable = false
    chipGroup.addView(chip as View, chipGroup.childCount - 1)
    chip.setOnCloseIconClickListener { chipGroup.removeView(chip as View) }
}

Answer 5

不是理想的解决方案，但绝对简单

<FrameLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <com.google.android.material.chip.Chip
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                app:chipMinTouchTargetSize="0dp" />

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="horizontal"
                android:weightSum="10">

                <EditText
                    android:id="@+id/add_frag_label_et_name"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center"
                    android:layout_marginStart="8dp"
                    android:layout_weight="9"
                    android:background="@null"
                    android:hint="Enter Label"
                    android:inputType="text"
                    android:paddingStart="8dp"
                    android:paddingEnd="0dp"
                    android:textAppearance="@style/TextAppearance.AppCompat.Medium"
                    android:textColor="@color/black"
                    android:textSize="14sp" />

                <ImageView
                    android:id="@+id/add_frag_label_iv_add"
                    android:layout_width="32dp"
                    android:layout_height="32dp"
                    android:layout_gravity="center"
                    app:tint="#6b6a6c"
                    android:layout_weight="1"
                    android:contentDescription="Add Label to note."
                    android:src="@mipmap/ic_plus_foreground" />
            </LinearLayout>
        </FrameLayout>

Answer 6

使用 TextInputLayout

chip_item.xml

<?xml version="1.0" encoding="utf-8"?>
<com.google.android.material.chip.Chip xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_height="wrap_content"
    style="@style/Widget.MaterialComponents.Chip.Action"
    app:closeIconEnabled="true"
    android:layout_width="wrap_content" />

tags_input_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

        <com.google.android.material.textfield.TextInputLayout
            android:id="@+id/i_input_v"
            style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
            android:layout_width="0dp"
            android:layout_height="0dp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            android:hint="Tags">

            <com.google.android.material.textfield.TextInputEditText
                android:layout_width="match_parent"
                android:gravity="bottom"
                android:paddingBottom="22dp"
                android:layout_height="match_parent" />
        </com.google.android.material.textfield.TextInputLayout>

    <com.google.android.material.chip.ChipGroup
        android:id="@+id/i_flex_box"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:alignContent="space_around"
        app:alignItems="stretch"
        app:flexWrap="wrap"
        android:layout_marginTop="12dp"
        android:layout_marginBottom="50dp"
        android:layout_marginStart="10dp"
        android:layout_marginEnd="10dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:showDivider="beginning|middle|end">


    </com.google.android.material.chip.ChipGroup>

</androidx.constraintlayout.widget.ConstraintLayout>

TagInputView.kt

class TagInputView @JvmOverloads constructor(
    context: Context, attrs: AttributeSet? = null
) : ConstraintLayout(context, attrs) {

    val chipGroup: ChipGroup

    init {
        LayoutInflater.from(context).inflate(R.layout.tags_input_layout, this, true)

        val inputLayout = findViewById<TextInputLayout>(R.id.i_input_v)
        val editText = inputLayout.editText!!
        chipGroup = findViewById(R.id.i_flex_box)

        editText.onFocusChangeListener = OnFocusChangeListener { _, hasFocus ->
            if (hasFocus) {
                if (editText.text.toString() == " "){
                    editText.text.clear()
                }
            } else {
                if (editText.text.isNullOrEmpty() && chipGroup.childCount > 0) {
                    editText.setText(" ")
                }
            }
        }

        editText.setOnKeyListener { _, _, event ->
            if (event.action == KeyEvent.ACTION_DOWN) {
//                onBackspacePressed, also edittext is empty
                if (chipGroup.childCount <= 0) return@setOnKeyListener false
                val lastChip = chipGroup.getChildAt(chipGroup.childCount - 1) as Chip
                editText.append(lastChip.text)
                chipGroup.removeView(lastChip)
            }
            false
        }

        editText.addTextChangedListener(object : TextWatcher {
            override fun beforeTextChanged(charSequence: CharSequence, i: Int, i1: Int, i2: Int) {}
            override fun onTextChanged(charSequence: CharSequence, i: Int, i1: Int, i2: Int) {}

            override fun afterTextChanged(editable: Editable) {
                val text = editable.toString()
                if (text.isNotEmpty() && text.endsWith(",")) {
                    addNewChip(text.removeSuffix(","))
                    editable.clear()
                }
            }
        })
    }

    private fun addNewChip(text: String) {
        val newChip =
            LayoutInflater.from(context).inflate(R.layout.chip_item, chipGroup, false) as Chip
        newChip.id = ViewCompat.generateViewId()
        newChip.text = text
        newChip.setOnCloseIconClickListener {
            chipGroup.removeView(newChip)
        }
        chipGroup.addView(newChip)
    }
}

用法

activity_main.xml

...
<com.shubhamgupta16.yourappid.utils.TagInputView
    android:id="@+id/tagInputView"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"/>
...

您还可以使用 tagInputView.chipGroup 属性.

访问 ChipGroup 内的所有 Chip

如何将 Material 组件库中的芯片添加到 android 中的输入字段？

How to add chips from Material Components library to input field in android?

android

material-design

material-components-android

material-components

android-chips

使用 TextInputLayout

用法

输出