如何将材料组件库中的芯片添加到android中的输入字段？

Question

我已经看到在android-P google中添加了包含材料芯片的新材料组件库:

android的材料组件

Material.io芯片使用

GitHub上的材质组件

所以我决定在我的项目中添加材料输入芯片,但遗憾的是没有找到任何教程如何制作.我想创建类似Gmail芯片的东西,但一开始没有图像.

因为我使用的程序兼容性库我试图通过使用材料的芯片android.support.design.chip.Chip和android.support.design.chip.ChipGroup.但结果只是芯片没有任何输入字段.此外,我尝试创建一个独立的ChipDrawable,然后将其添加到EditText使用

Editable text = editText.getText();

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

但是我没有任何芯片就得到了空的EditText.那么我如何使用这个材料组件库创建像Gmail一样的芯片输入呢？也许有人有经验或知道任何教程,我可以看到如何创建这个？

提前致谢!

Answer 1

如果您想使用多行芯片实现类似 gmail 的行为，所有以前的解决方案对我都不起作用。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" />

现在的诀窍是向该组添加一个新筹码，但作为倒数第二个位置。像这样的东西：

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 2

回答

没有用于在android中添加芯片的默认输入字段.他们提到输入芯片,但我没有找到输入芯片的任何布局或视图组.所以我用Chipdrawable在edittext中添加芯片的方法.这里使用AppCompatEdittext您可以更改为监听文本输入的任何视图. 参考.

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/ChipTextApperance"
 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(对于更改textStyle)

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

第2步

使用AppCompatEdittext在这里添加您的视图

  <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
将此代码添加到视图中以获得所需的行为.

 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.

OUTPUT

EDITED

您可以在此处找到有关如何将文本居中与span对齐的详细信息.

在这里,我添加了解决方案中的一些代码将为您修复..

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();
}

}

并改变你的imagespan类,如下所示

VerticalImageSpan span = new VerticalImageSpan(chip);

Answer 3

使用文本输入布局

芯片项目.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" />

标签输入布局.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>

标签输入视图.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

活动主文件

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

您还可以使用属性访问Chip内部的所有内容。ChipGrouptagInputView.chipGroup

输出