android TextView 的圆角背景

实现方法：

定义类继承自Shape画成圆角矩形

public class MyShape extends Shape{

@Override
public void draw(Canvas canvas, Paint paint) {
// TODO Auto-generated method stub
paint.setColor(Color.RED);

canvas.drawRoundRect(new RectF(0, 0, 200, 30), 8, 8, paint);
}

}

ShapeDrawable mShapeDrawable = new ShapeDrawable();
mShapeDrawable.setShape(new MyShape());
textview.setBackgroundDrawable(mShapeDrawable);

自定义一个继承自TextView的类。重写onDraw方法，在onDraw方法中获得

Textview的实际大小，然后把参数传给RectF就可以画一个跟View大小一致的圆角矩形了。

这里有一个例子（还包含了写其他功能的代码）

package com.textview.style;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.RectF;import android.graphics.drawable.ShapeDrawable;import android.graphics.drawable.shapes.Shape;import android.text.TextPaint;import android.text.TextUtils;import android.util.AttributeSet;import android.util.Log;import android.widget.TextView;public class PatchView_New extends TextView{private static final String TAG = "lxy";private static final float ELLIPSIZE_COEFFICIENT = 12.0f;private RectF mRect ;private int mColor = Color.YELLOW;private ShapeDrawable mShapeDrawable;private String realString;private String showString;private int _num;public PatchView_New(Context context) {super(context);setWillNotDraw(false);drawDefaultBGColor();setSingleLine(true);//setEllipsize(TextUtils.TruncateAt.valueOf("MIDDLE"));Log.d(TAG, "__________________ PatchView_New().1 _____________________");}public PatchView_New(Context context, AttributeSet attrs) {super(context, attrs);setWillNotDraw(false);drawDefaultBGColor();setSingleLine(true);//setEllipsize(TextUtils.TruncateAt.valueOf("MIDDLE"));Log.d(TAG, "__________________ PatchView_New().2 _____________________");}@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);Log.d(TAG, "__________________ onDraw() _____________________ mRect = " + mRect);if(mRect == null){mRect = new RectF();}//mRect.left = this.getLeft();mRect.right = this.getRight() - this.getLeft();//mRect.top = this.getTop();mRect.bottom = this.getBottom() - this.getTop();Log.d(TAG, "mRect = " + mRect);Log.d(TAG, "______________ _num = " + _num);if(_num >= 1){//_num = 0;return;}_num ++;if(mRect.width() != 0 && mRect.height() != 0){showString = getRightDisplayString(realString, getAvail());Log.d(TAG, "onDraw()_______________showString = " + showString);this.setText(showString);}}public void drawDefaultBGColor(){if(mShapeDrawable == null){mShapeDrawable = new ShapeDrawable();}mShapeDrawable.setShape(new MyShape());setBackgroundDrawable(mShapeDrawable);}public void setMultiViewText(String headStr,String centerStr,  String tailStr){_num = 0;Log.d(TAG, "__________________ setMultiViewText() _____________________" + centerStr);realString = centerStr;setText(realString);}public void setCenterViewBGColor(int color){_num = 0;Log.d(TAG, "__________________ setCenterViewBGColor() _____________________" + color);this.mColor = color;}/*------------------------- 字符截断 START ---------------------- ----------*/private String getRightDisplayString(String real, float width){if(TextUtils.isEmpty(real)){return "";}return TextUtils.ellipsize(real, new TextPaint(), width, TextUtils.TruncateAt.valueOf("MIDDLE")).toString();}private float getAvail(){return ELLIPSIZE_COEFFICIENT * mRect.width()/getTextSize();}/*------------------------- END  ---------------------------------------*//*====================== Inner Class START===========================*/private class MyShape extends Shape{@Overridepublic void draw(Canvas canvas, Paint paint) {// TODO Auto-generated method stubpaint.setColor(mColor);Log.d(TAG, "__________________ draw() _____________________ mRect = " + mRect);if(mRect == null){mRect = new RectF();}canvas.drawRoundRect(mRect, 8f, 8f, paint);}}/*============================ END===================================*/}

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