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
创建xml (view_line_dot .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>
设置为视图背景:
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="@drawable/view_line_dotted" />
其他回答
创建xml (view_line_dot .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>
设置为视图背景:
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="@drawable/view_line_dotted" />
当我想要绘制虚线时，我所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>
然后在布局中定义一个带背景的视图为dash_line。注意要包括android:layerType="software"，否则它将无法工作。
<View
android:layout_width="match_parent"
android:layout_height="5dp"
android:background="@drawable/dash_line"
android:layerType="software" />
通过使用这个类，您可以对多行文本应用“虚线和下划线”效果。使用dashpatheeffect你必须关闭你的TextView的hardwareAccelerated(虽然dashpatheeffect方法有一个长文本的问题)。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:
最佳解决方案的虚线背景工作完美
<?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>
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" />
