我要画一条虚线。我现在用这个来画实线:
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，但不是实心的，而是虚线的。我想避免在透明布局和固体布局之间交替制作数百个布局。
当前回答
这些答案对我都没用。大多数答案都给出了一个半透明的边框。为了避免这种情况，您需要再次用另一个具有您喜欢的颜色的容器包装您的容器。这里有一个例子:
这就是它的样子
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 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>
其他回答
我自定义了一个虚线，支持水平和垂直虚线。下面的代码:
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);
}
}
}
我使用下面的作为布局的背景:
<?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>
使用XML创建虚线。 在可绘制文件夹中创建xml，并给你想要设置虚线边界的项目提供背景。
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>
添加背景到项目:
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/dashed_border"/>
我不知道为什么，但投票的答案不适合我。我这样写，效果很好。 定义一个自定义视图:
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);
}
}
然后你可以在你的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"/>
如果你正在寻找一条垂直线使用这个绘图。
<?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>
顶部、底部和左侧的负值删除形状不需要的边，只留下一条虚线。
在视图中使用它。
<View
android:layout_width="4dp"
android:layout_height="match_parent"
android:background="@drawable/dash_line_vertical"
android:layerType="software" />
