android给图片添加边框

16lz 2021-01-26

方案一：继承ImageView，在onDraw重写画图函数，在图片边延画条灰色的线

方案二：在灰色背景下，内缩2个像索，再内嵌个图片。

view plain

packagecom.xmz.activity;
importandroid.content.Context;
importandroid.graphics.Canvas;
importandroid.graphics.Color;
importandroid.graphics.Paint;
importandroid.graphics.Rect;
importandroid.util.AttributeSet;
importandroid.widget.ImageView;
publicclassImageViewBorderextendsImageView{
privateStringnamespace="http://xmz.com";
privateintcolor;
publicImageViewBorder(Contextcontext,AttributeSetattrs){
super(context,attrs);
color=Color.parseColor(attrs.getAttributeValue(namespace,"BorderColor"));
}
@Override
protectedvoidonDraw(Canvascanvas){
super.onDraw(canvas);
//画边框暂时去除小边框
Rectrec=canvas.getClipBounds();
rec.bottom--;
rec.right--;
Paintpaint=newPaint();
paint.setColor(color);
paint.setStyle(Paint.Style.STROKE);
canvas.drawRect(rec,paint);
}
}

view plain

<?xmlversion="1.0"encoding="utf-8"?>
<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
xmlns:xmz="http://xmz.com"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="方案一："
/>
<com.xmz.activity.ImageViewBorder
android:layout_width="124px"
android:layout_height="180px"
android:background="@drawable/movie"
xmz:BorderColor="GRAY"
/>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="方案二："
/>
<LinearLayout
android:layout_width="124px"
android:layout_height="180px"
android:background="@drawable/image_bg"
android:padding="2px">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/movie"
/>
</LinearLayout>
</LinearLayout>

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