Question

我正在尝试制作虚线。我现在正在使用它来获得一条实线：

LinearLayout divider = new LinearLayout( this );
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams( LinearLayout.LayoutParams.FILL_PARENT, 2 );
divider.setLayoutParams( params );
divider.setBackgroundColor( getResources().getColor( R.color.grey ) );

我需要这样的东西，但点缀而不是坚固。我想避免在透明布局和实体布局之间交替进行数百种布局。

Answer 1

没有java代码：

抽拉/ dotted.xml：

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="line">

    <stroke
       android:color="#C7B299"
       android:dashWidth="10px"
       android:dashGap="10px"
       android:width="1dp"/>
</shape>

view.xml用：

<ImageView
    android:layout_width="match_parent"
    android:layout_height="5dp"
    android:src="@drawable/dotted"
    android:layerType="software" />

Answer 2

路径效果在绘画对象

上设置

Paint fgPaintSel = new Paint();
fgPaintSel.setARGB(255, 0, 0,0);
fgPaintSel.setStyle(Style.STROKE);
fgPaintSel.setPathEffect(new DashPathEffect(new float[] {10,20}, 0));

您可以通过在int []数组中提供更多数字来创建各种虚线图案，它指定了破折号和间隙的比率。这是一个简单的，同样虚线的行。

Answer 3

这会对你有所帮助。使用XML创建虚线。在可绘制文件夹中创建xml，并将该背景提供给要设置虚线边框的项目。

----＆GT;创建XML背景“dashed_border”

<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
    <item>
        <shape>
            <solid android:color="#ffffff" />
            <stroke
                android:dashGap="5dp"
                android:dashWidth="5dp"
                android:width="1dp"
                android:color="#0000FF" />
            <padding
                android:bottom="5dp"
                android:left="5dp"
                android:right="5dp"
                android:top="5dp" />
        </shape>
    </item>
</layer-list>

- - - - ＆GT;将该背景添加到项目

<Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/dashed_border"/>

Answer 4

创建xml（view_line_dotted.xml）：

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
        <item
            android:bottom="-1dp"
            android:left="-1dp"
            android:right="-1dp"
            android:top="0dp">

            <shape android:shape="rectangle">
                <stroke
                    android:width="1dp"
                    android:color="#ffff0017"
                    android:dashGap="3dp"
                    android:dashWidth="1dp" />

                <solid android:color="@android:color/transparent" />

                <padding
                    android:bottom="10dp"
                    android:left="10dp"
                    android:right="10dp"
                    android:top="10dp" />
            </shape>
        </item>
</layer-list>

设置为视图的背景：

<View
    android:layout_width="match_parent"
    android:layout_height="1dp"
    android:background="@drawable/view_line_dotted" />

Answer 5

当我想画一条虚线时，我做的是定义一个可绘制的 dash_line.xml ：

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" 
    android:shape="line" >
<stroke
    android:dashGap="3dp"
    android:dashWidth="2dp"
    android:width="1dp"
    android:color="@color/black" />
</shape>

然后在布局中，只需将背景定义为 dash_line 。请注意包含 android：layerType =＆＃34;软件＆＃34; ，否则它将无法正常工作。

<View
            android:layout_width="match_parent"
            android:layout_height="5dp"
            android:background="@drawable/dash_line"
            android:layerType="software" />

Answer 6

我自定义了一条支持水平和垂直虚线的虚线。代码如下：

public class DashedLineView extends View
{
private float density;
private Paint paint;
private Path path;
private PathEffect effects;

public DashedLineView(Context context)
{
    super(context);
    init(context);
}

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

public DashedLineView(Context context, AttributeSet attrs, int defStyle)
{
    super(context, attrs, defStyle);
    init(context);
}

private void init(Context context)
{
    density = DisplayUtil.getDisplayDensity(context);
    paint = new Paint();
    paint.setStyle(Paint.Style.STROKE);
    paint.setStrokeWidth(density * 4);
    //set your own color
    paint.setColor(context.getResources().getColor(R.color.XXX));
    path = new Path();
    //array is ON and OFF distances in px (4px line then 2px space)
    effects = new DashPathEffect(new float[] { 4, 2, 4, 2 }, 0);

}

@Override
protected void onDraw(Canvas canvas)
{
    // TODO Auto-generated method stub
    super.onDraw(canvas);
    paint.setPathEffect(effects);
    int measuredHeight = getMeasuredHeight();
    int measuredWidth = getMeasuredWidth();
    if (measuredHeight <= measuredWidth)
    {
        // horizontal
        path.moveTo(0, 0);
        path.lineTo(measuredWidth, 0);
        canvas.drawPath(path, paint);
    }
    else
    {
        // vertical
        path.moveTo(0, 0);
        path.lineTo(0, measuredHeight);
        canvas.drawPath(path, paint);
    }

}
}

Answer 7

通过使用此课程，您可以应用＆＃34;虚线和下划线＆＃34;对多行文字的影响。要使用DashPathEffect，您必须关闭TextView的hardwareAccelerated（尽管DashPathEffect方法有长文本问题）。你可以在这里找到我的示例项目：https://github.com/jintoga/Dashed-Underlined-TextView/blob/master/Untitled.png。

public class DashedUnderlineSpan implements LineBackgroundSpan, LineHeightSpan {

    private Paint paint;
    private TextView textView;
    private float offsetY;
    private float spacingExtra;

    public DashedUnderlineSpan(TextView textView, int color, float thickness, float dashPath,
                               float offsetY, float spacingExtra) {
        this.paint = new Paint();
        this.paint.setColor(color);
        this.paint.setStyle(Paint.Style.STROKE);
        this.paint.setPathEffect(new DashPathEffect(new float[] { dashPath, dashPath }, 0));
        this.paint.setStrokeWidth(thickness);
        this.textView = textView;
        this.offsetY = offsetY;
        this.spacingExtra = spacingExtra;
    }

    @Override
    public void chooseHeight(CharSequence text, int start, int end, int spanstartv, int v,
                             Paint.FontMetricsInt fm) {
        fm.ascent -= spacingExtra;
        fm.top -= spacingExtra;
        fm.descent += spacingExtra;
        fm.bottom += spacingExtra;
    }

    @Override
    public void drawBackground(Canvas canvas, Paint p, int left, int right, int top, int baseline,
                               int bottom, CharSequence text, int start, int end, int lnum) {
        int lineNum = textView.getLineCount();
        for (int i = 0; i < lineNum; i++) {
            Layout layout = textView.getLayout();
            canvas.drawLine(layout.getLineLeft(i), layout.getLineBottom(i) - spacingExtra + offsetY,
                    layout.getLineRight(i), layout.getLineBottom(i) - spacingExtra + offsetY,
                    this.paint);
        }
    }
}

结果：

Answer 8

对于画布上的虚线效果，将此属性设置为paint对象：

paint.setPathEffect(new DashPathEffect(new float[] {0,30}, 0));

并根据您的渲染效果更改值30：它表示每个点之间的“距离”。

Answer 9

我使用以下作为布局的背景：

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
       android:shape="rectangle">
<stroke
   android:width="1dp"
    android:dashWidth="10px"
   android:dashGap="10px"
    android:color="android:@color/black" 
   />
</shape>

Answer 10

如果您正在寻找垂直线，请使用此drawable。

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:top="-8dp"
        android:bottom="-8dp"
        android:left="-8dp">
        <shape>
            <solid android:color="@android:color/transparent"/>
            <stroke
                android:width="4dp"
                android:color="#ffffff"
                android:dashGap="4dp"
                android:dashWidth="4dp"/>
        </shape>
    </item>
</layer-list>

负的顶部底部和左侧值会移除形状的不需要的边，只留下一条虚线。

在这样的视图中使用它。

<View
android:layout_width="4dp"
android:layout_height="match_parent"
android:background="@drawable/dash_line_vertical"
android:layerType="software" />

Answer 11

我喜欢Ruidge中的解决方案，但是我需要从XML获得更多控制。所以我将其更改为Kotlin并添加了属性。

1）复制Kotlin类：

import android.content.Context
import android.graphics.*
import android.util.AttributeSet
import android.view.View

class DashedDividerView : View {
constructor(context: Context) : this(context, null, 0)
constructor(context: Context, attributeSet: AttributeSet) : this(context, attributeSet, 0)

companion object {
    const val DIRECTION_VERTICAL = 0
    const val DIRECTION_HORIZONTAL = 1
}

private var dGap = 5.25f
private var dWidth = 5.25f
private var dColor = Color.parseColor("#EE0606")
private var direction = DIRECTION_HORIZONTAL
private val paint = Paint()
private val path = Path()

constructor(context: Context, attrs: AttributeSet?, defStyleAttr: Int) : super(
    context,
    attrs,
    defStyleAttr
) {
    val typedArray = context.obtainStyledAttributes(
        attrs,
        R.styleable.DashedDividerView,
        defStyleAttr,
        R.style.DashedDividerDefault
    )

    dGap = typedArray.getDimension(R.styleable.DashedDividerView_dividerDashGap, dGap)
    dWidth = typedArray.getDimension(R.styleable.DashedDividerView_dividerDashWidth, dWidth)
    dColor = typedArray.getColor(R.styleable.DashedDividerView_dividerDashColor, dColor)
    direction =
        typedArray.getInt(R.styleable.DashedDividerView_dividerDirection, DIRECTION_HORIZONTAL)

    paint.color = dColor
    paint.style = Paint.Style.STROKE
    paint.pathEffect = DashPathEffect(floatArrayOf(dWidth, dGap), 0f)
    paint.strokeWidth = dWidth

    typedArray.recycle()
}

override fun onDraw(canvas: Canvas) {
    super.onDraw(canvas)
    path.moveTo(0f, 0f)

    if (direction == DIRECTION_HORIZONTAL) {
        path.lineTo(measuredWidth.toFloat(), 0f)
    } else {
        path.lineTo(0f, measuredHeight.toFloat())
    }
    canvas.drawPath(path, paint)
}

}

2）在 / res 目录中创建一个 attr 文件，并将其添加

 <declare-styleable name="DashedDividerView">
    <attr name="dividerDashGap" format="dimension" />
    <attr name="dividerDashWidth" format="dimension" />
    <attr name="dividerDashColor" format="reference|color" />
    <attr name="dividerDirection" format="enum">
        <enum name="vertical" value="0" />
        <enum name="horizontal" value="1" />
    </attr>
</declare-styleable>

3）将样式添加到样式文件

 <style name="DashedDividerDefault">
    <item name="dividerDashGap">2dp</item>
    <item name="dividerDashWidth">2dp</item>
    <!-- or any color -->
    <item name="dividerDashColor">#EE0606</item>
    <item name="dividerDirection">horizontal</item>
</style>

4）现在您可以使用默认样式

<!-- here will be your path to the class -->
<com.your.package.app.DashedDividerView
    android:layout_width="match_parent"
    android:layout_height="2dp"
    />

或以XML设置属性

<com.your.package.app.DashedDividerView
    android:layout_width="match_parent"
    android:layout_height="2dp"
    app:dividerDirection="horizontal"
    app:dividerDashGap="2dp"
    app:dividerDashWidth="2dp"
    app:dividerDashColor="@color/light_gray"/>

Answer 12

这些答案都不对我有用。这些答案大多数都为您提供了半透明的边框。为避免这种情况，您需要用另一个具有您喜欢的颜色的容器再次包装您的容器。这是一个示例：

This is how it looks

dashed_border_layout.xml

<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:backgroundTint="@color/black"
android:background="@drawable/dashed_border_out">
<LinearLayout
    android:layout_width="150dp"
    android:layout_height="50dp"
    android:padding="5dp"
    android:background="@drawable/dashed_border_in"
    android:orientation="vertical">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="This is&#10;Dashed Container"
        android:textSize="16sp" />
</LinearLayout>

dashed_border_in.xml

<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<item>
    <shape>
        <corners android:radius="10dp" />
        <solid android:color="#ffffff" />
        <stroke
            android:dashGap="5dp"
            android:dashWidth="5dp"
            android:width="3dp"
            android:color="#0000FF" />
        <padding
            android:bottom="5dp"
            android:left="5dp"
            android:right="5dp"
            android:top="5dp" />
    </shape>
</item>

dashed_border_out.xml

<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<item>
    <shape>
        <corners android:radius="12dp" />
    </shape>
</item>

Answer 13

使用ShapeDrawable而不是LinearLayout并使用dashWidth和dashGap

http://developer.android.com/guide/topics/resources/drawable-resource.html#Shape

Answer 14

对我来说唯一有用的东西，我认为最简单的方法是使用带有这样的绘图对象的Path：

    Paint paintDash = new Paint();
    paintDash.setARGB(255, 0, 0, 0);
    paintDash.setStyle(Paint.Style.STROKE);
    paintDash.setPathEffect(new DashPathEffect(new float[]{10f,10f}, 0));
    paintDash.setStrokeWidth(2);
    Path pathDashLine = new Path();

然后onDraw（）:(如果你在ondraw调用之间更改这些点，重要的调用重置，导致Path保存所有的移动）

    pathDashLine.reset();
    pathDashLine.moveTo(porigenX, porigenY);
    pathDashLine.lineTo(cursorX,cursorY);
    c.drawPath(pathDashLine, paintDash);

Answer 15

虚线背景的最佳解决方案完美无缺

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
       android:shape="rectangle">
  <stroke
    android:dashGap="3dp"
    android:dashWidth="2dp"
    android:width="1dp"
    android:color="@color/colorBlack" />
</shape>

Answer 16

我为EditText创建了虚线。干得好。创建您的新xml。例如dashed_border.xml此处的代码：

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item
    android:bottom="1dp"
    android:left="-2dp"
    android:right="-2dp"
    android:top="-2dp">
    <shape android:shape="rectangle">
        <stroke
            android:width="2dp"
            android:color="#000000"
            android:dashGap="3dp"
            android:dashWidth="1dp" />

        <solid android:color="#00FFFFFF" />

        <padding
            android:bottom="10dp"
            android:left="10dp"
            android:right="10dp"
            android:top="10dp" />
    </shape>
</item></layer-list>

并在EditText中使用新的xml文件，例如：

<EditText
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@drawable/dashed_border"/>

干杯！：）

Answer 17

我不知道为什么，但投票的答案对我不起作用。我这样写，并且运作良好定义自定义视图：

public class XDashedLineView extends View {

private Paint   mPaint;
private Path    mPath;
private int     vWidth;
private int     vHeight;

public XDashedLineView(Context context) {
    super(context);
    init();
}

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

public XDashedLineView(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    init();
}

private void init() {
    mPaint = new Paint();
    mPaint.setColor(Color.parseColor("#3F577C"));
    mPaint.setStyle(Paint.Style.STROKE);
    mPaint.setPathEffect(new DashPathEffect(new float[] {10,10}, 0));
    mPath = new Path();
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    this.vWidth = getMeasuredWidth();
    this.vHeight = getMeasuredHeight();
    mPath.moveTo(0, this.vHeight / 2);
    mPath.quadTo(this.vWidth / 2, this.vHeight / 2, this.vWidth, this.vHeight / 2);
}

@Override
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    canvas.drawPath(mPath, mPaint);
}
}

然后你可以在xml中使用它：

        <com.YOUR_PACKAGE_NAME.XDashedLineView
        android:layout_width="690dp"
        android:layout_height="1dp"
        android:layout_marginLeft="30dp"
        android:layout_marginTop="620dp"/>

Answer 18

我已经创建了一个带有自定义视图的库来解决这个问题，它应该非常简单易用。有关详情，请参阅https://github.com/Comcast/DahDit。您可以添加如下虚线：

<com.xfinity.dahdit.DashedLine
    android:layout_width="250dp"
    android:layout_height="wrap_content"
    app:dashHeight="4dp"
    app:dashLength="8dp"
    app:minimumDashGap="3dp"
    app:layout_constraintRight_toRightOf="parent"
    android:id="@+id/horizontal_dashes"/>

Answer 19

类似于tier777，这是一条水平线的解决方案：

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:top="-1dp">
        <shape android:shape="line">
            <stroke
                android:width="1dp"
                android:color="#111"
                android:dashWidth="8dp"
                android:dashGap="2dp"
                />
            <solid android:color="@android:color/transparent" />
        </shape>
    </item>
</layer-list>

线索是<item android:top="-1dp">。

为了在旧设备（<= API 21）上显示虚线，您应该使用android:layerType="software"（请参阅Android dashed line drawable potential ICS bug）创建视图：

<?xml version="1.0" encoding="utf-8"?>
<View xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="1dp"
    android:background="@drawable/dashed_line"
    android:layerType="software"
    />

此外，您可以将不带android:layerType="software"的同一视图添加到layout-v23以获得更好的性能，但是我不确定它是否可以在所有使用API 23的设备上使用。

如何在Android中创建虚线/虚线？

19 个答案: