动态设置TextView边框颜色

1.在values文件下的attrs.xml中添加样式：

<declare-styleable name="TextViewBorder">    <attr name="tvborderColor" format="color" />    <attr name="tvBorderWidth" format="integer" /></declare-styleable>

2.自定义TextView：

public class TextViewBorder extends android.support.v7.widget.AppCompatTextView {    private int strokeWidth = 2; // 默认边框宽度    private int borderCol;    private Paint borderPaint;    public TextViewBorder(Context context, AttributeSet attrs) {        super(context, attrs);        TypedArray a = context.getTheme().obtainStyledAttributes(attrs,                R.styleable.TextViewBorder, 0, 0);        try {            borderCol = a.getInteger(R.styleable.TextViewBorder_tvborderColor, 0);//0 is default            strokeWidth=a.getInteger(R.styleable.TextViewBorder_tvborderColor,2);                    } finally {            a.recycle();        }        borderPaint = new Paint();        borderPaint.setStyle(Paint.Style.STROKE);        borderPaint.setStrokeWidth(strokeWidth);        borderPaint.setAntiAlias(true);    }    @Override    protected void onDraw(Canvas canvas) {        if (0 == this.getText().toString().length()) {            return;        }        borderPaint.setColor(borderCol);        int w = this.getMeasuredWidth();        int h = this.getMeasuredHeight();        RectF r = new RectF(2, 2, w - 2, h - 2);        canvas.drawRoundRect(r, 5, 5, borderPaint);        super.onDraw(canvas);    }    public int getBordderColor() {        return borderCol;    }    public void setBorderColor(int newColor) {        borderCol = newColor;        invalidate();        requestLayout();    }    public void setBorderWidth(int width){        strokeWidth=width;        invalidate();        requestLayout();    }

3.布局里使用：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:orientation="vertical">  
  <TextViewBorder    android:id="@+id/tv_text"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:gravity="center"    app:tvborderColor="@color/green"    tools:text="中国武术" />
</LinearLayout>

4.在调用处可以直接通过TextViewBorder.setBorderColor()赋值。