Android开发使用Drawable绘制圆角与圆形图案功能示例

/** * 圆角矩形 * @Project  App_View * @Package  com.android.view.drawable * @author   chenlin * @version  1.0 * @Date    2016年4月21日 * @Note    TODO */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;  }}

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);  }}