我已经看到,在android中,google添加了新的材料组件库,其中包含了材料芯片:
因此,我决定在我的项目中添加材料输入芯片,但不幸的是,我没有找到任何教程如何制作该芯片。我想创造一些类似Gmail芯片,但没有图像在一开始。
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的材料芯片。但结果只是芯片没有任何输入字段。另外,我尝试创建一个独立的ChipDrawable,然后使用以下方法将其添加到EditText
Editable text = editText.getText();
text.setSpan(span, 0, text.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);但是我没有任何芯片的EditText是空的。那么,如何使用这个材料组件库创建像Gmail中那样的芯片输入呢?也许有人有经验,或者知道有什么教程,我可以看到如何创建这个?
提前感谢!
发布于 2018-07-31 10:15:46
答案
没有在android中添加芯片的默认输入字段。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方法在编辑文本中添加芯片。这里使用的是AppCompatEdittext,您可以更改为任何监听文本输入的视图。参考文献。
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中添加文本外观样式(用于更改textStyle)
<style name="ChipTextAppearance" parent="TextAppearance.MaterialComponents.Chip">
<item name="android:textColor">@android:color/white</item>
</style>步骤2
使用AppCompatEdittext添加您在这里的视图
<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();
}
}
});当需要在编辑文本中添加新的芯片时,会根据需要更改chipLength。
输出

编辑的
您可以找到更多关于如何用span 这里对齐文本中心的信息。
在这里,我为您添加了一些解决方案中的代码。
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();
}
}并更改图片类如下所示
VerticalImageSpan span = new VerticalImageSpan(chip);发布于 2020-05-12 09:40:03
如果您想要在多行芯片上实现类似gmail的行为,那么前面所有的解决方案都不适用于我。为了做到这一点,我不得不避免使用FlexboxLayout.,而不是使用ChipGroup

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" />
现在的诀窍是在小组中增加一个新的芯片,但作为第二位。就像这样:
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) }
}发布于 2019-02-25 11:06:49
我们可以这样做,使用材料芯片设计本身,而不添加任何额外的风格。
将其添加到AndroidX的应用程序级上
实现'com.google.android.material:material:1.0.0-beta01‘
对于比AndroidX更早的用户,请使用此
实现“com.android.Support:design:28.0”

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>欲获得更多参考,单击此处
https://stackoverflow.com/questions/50574943
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