如何在Android中利用Drawable绘制一个圆角？相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。
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1. 创建类RoundCircleDrawable继承Drawable
public class RoundCircleDrawable extends Drawable{
private Paint mPaint;//画笔
private int mWidth;//图片宽与长度的最小值
private int mRadius;//半径
private int mRound;//圆角
private RectF mRectF;//矩形
private Bitmap mBitmap;//图片
private Type mType = Type.TYPE_ROUND;//默认是矩形
//设置类型
enum Type{
TYPE_ROUND, TYPE_CICLE;
}
public RoundCircleDrawable(Bitmap bitmap){
this.mBitmap = bitmap;
//初始化画笔
mPaint = new Paint();
mPaint.setAntiAlias(true);
BitmapShader shader = new BitmapShader(mBitmap, TileMode.CLAMP, TileMode.CLAMP);
mPaint.setShader(shader);
mWidth = Math.min(mBitmap.getWidth(), mBitmap.getHeight());
mRadius = mWidth / 2;
}
/**
* 向外提供设置图片类型的方法
* @param type
*/
public void setType(Type type){
this.mType = type;
}
/**
* 暴露给外面设置圆角的大小
*
* @param round
*/
public void setRound(int round) {
this.mRound = round;
}
@Override
public void setBounds(int left, int top, int right, int bottom) {
super.setBounds(left, top, right, bottom);
mRectF = new RectF(left, top, right, bottom);
}
@Override
public void draw(Canvas canvas) {
if (mType == Type.TYPE_ROUND) {
canvas.drawRoundRect(mRectF, mRound, mRound, mPaint);
}else {
canvas.drawCircle(mWidth / 2, mWidth / 2, mRadius, mPaint);
}
}
@Override
public int getIntrinsicWidth() {
if (mType == Type.TYPE_CICLE) {
return mWidth;
}else {
return mBitmap.getWidth();
}
}
@Override
public int getIntrinsicHeight() {
if (mType == Type.TYPE_CICLE) {
return mWidth;
}else {
return mBitmap.getHeight();
}
}
@Override
public void setAlpha(int alpha) {
mPaint.setAlpha(alpha);
}
@Override
public void setColorFilter(ColorFilter cf) {
mPaint.setColorFilter(cf);
}
@Override
public int getOpacity() {
return PixelFormat.TRANSLUCENT;
}
}2. 实现方法
public class RoundActivity extends Activity {
private ImageView mImageView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_round_drawable);
mImageView = (ImageView) findViewById(R.id.iv_round);
Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.aa);
//RoundImageDrawable drawable = new RoundImageDrawable(bitmap);
//drawable.setRound(30);
RoundCircleDrawable drawable = new RoundCircleDrawable(bitmap);
drawable.setRound(50);
mImageView.setImageDrawable(drawable);
}
}看完上述内容，你们掌握如何在Android中利用Drawable绘制一个圆角的方法了吗？如果还想学到更多技能或想了解更多相关内容，欢迎关注创新互联行业资讯频道，感谢各位的阅读！
