是否可以在Android TextView周围绘制边框?


当前回答

使用材质组件库,可以使用MaterialShapeDrawable。

    <TextView
        android:id="@+id/textview"
        .../>

然后可以通过编程方式应用MaterialShapeDrawable:

    TextView textView = findViewById(R.id.textview);
    MaterialShapeDrawable shapeDrawable = new MaterialShapeDrawable();
    shapeDrawable.setFillColor(ContextCompat.getColorStateList(this,android.R.color.transparent));
    shapeDrawable.setStroke(1.0f, ContextCompat.getColor(this,R.color....));
    ViewCompat.setBackground(textView,shapeDrawable);

其他回答

更改康斯坦丁·布罗夫的答案,因为在我的情况下不起作用:

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <shape android:shape="rectangle">
            <solid android:color="@android:color/white" />
            <stroke android:width="2dip" android:color="#4fa5d5"/>
            <corners android:radius="7dp"/>
        </shape>
    </item>
</selector>

compileSdkVersion 26(Android 8.0),minSdkVersion 21(Android 5.0),targetSdkV版本26,实现“com.android.support:appcompat-v7:26.1.0”,等级:4.1

我找到了一种更好的方法来在TextView周围添加边框。

使用九块图像作为背景。它非常简单,SDK附带了一个制作9补丁图像的工具,而且它绝对不需要编码。

链接是http://developer.android.com/guide/topics/graphics/2d-graphics.html#nine-补丁。

我有一个非常简单的方法,我想分享一下。

当我想调整文本视图时,我只需将它们放在LinearLayout中。我设置了LinearLayout的背景色,并为TextView添加了边距。结果就像是将TextView平方一样。

这是我的“简单”助手类,它返回带有边框的ImageView。只需将其放在utils文件夹中,并按如下方式调用:

ImageView selectionBorder = BorderDrawer.generateBorderImageView(context, borderWidth, borderHeight, thickness, Color.Blue);

这是代码。

/**
 * Because creating a border is Rocket Science in Android.
 */
public class BorderDrawer
{
    public static ImageView generateBorderImageView(Context context, int borderWidth, int borderHeight, int borderThickness, int color)
    {
        ImageView mask = new ImageView(context);

        // Create the square to serve as the mask
        Bitmap squareMask = Bitmap.createBitmap(borderWidth - (borderThickness*2), borderHeight - (borderThickness*2), Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(squareMask);

        Paint paint = new Paint();
        paint.setStyle(Paint.Style.FILL);
        paint.setColor(color);
        canvas.drawRect(0.0f, 0.0f, (float)borderWidth, (float)borderHeight, paint);

        // Create the darkness bitmap
        Bitmap solidColor = Bitmap.createBitmap(borderWidth, borderHeight, Bitmap.Config.ARGB_8888);
        canvas = new Canvas(solidColor);

        paint.setStyle(Paint.Style.FILL);
        paint.setColor(color);
        canvas.drawRect(0.0f, 0.0f, borderWidth, borderHeight, paint);

        // Create the masked version of the darknessView
        Bitmap borderBitmap = Bitmap.createBitmap(borderWidth, borderHeight, Bitmap.Config.ARGB_8888);
        canvas = new Canvas(borderBitmap);

        Paint clearPaint = new Paint();
        clearPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));

        canvas.drawBitmap(solidColor, 0, 0, null);
        canvas.drawBitmap(squareMask, borderThickness, borderThickness, clearPaint);

        clearPaint.setXfermode(null);

        ImageView borderView = new ImageView(context);
        borderView.setImageBitmap(borderBitmap);

        return borderView;
    }
}

可以将可绘制的形状(带角的矩形)设置为视图的背景。

<TextView android:background="@drawable/frame"/>

矩形可绘制框架.xml(放入res/drawable文件夹):

<shape
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle" >
    <solid android:color="@android:color/white" />
    <stroke android:width="1dip"
     android:color="#3d4caf"/>
    <corners android:radius="50dp"/>
</shape>