自定義圓形背景RelativeLayout
阿新 • • 發佈:2018-11-12
最近公司專案愛用到圓角背景的RelativeLayout,一般圓角背景的實現思路無非就是兩種,第一種用.xml實現,需要用到.9圖片,防止圖片變形,如果要改變背景顏色的話,不可避免的要找美工妹子作圖,看著我的美工妹子一臉幽怨的小表情,我打算還是用第二種方法吧,就是自已用程式碼繪製一個,要改變角度,要改變顏色,改下設定就可以了,輕鬆又便捷,簡單又方便,媽媽再也不用擔心我的明天了~~~~
import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.PorterDuff; import android.graphics.PorterDuffXfermode; import android.graphics.RectF; import android.util.AttributeSet; import android.view.View; import android.widget.RelativeLayout; public class RoundRelativeLayoutTest extends RelativeLayout { private final RectF roundRect = new RectF(); private float rect_adius = 10; //單位為畫素 private final Paint maskPaint = new Paint(); private final Paint zonePaint = new Paint(); private View mView; private Context mContext; public RoundRelativeLayoutTest(Context context) { super(context); init(); } public RoundRelativeLayoutTest(Context context, AttributeSet attrs) { super(context, attrs); init(); } public RoundRelativeLayoutTest(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); init(); } private void init() { maskPaint.setAntiAlias(true); maskPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN)); // zonePaint.setAntiAlias(true); zonePaint.setColor(Color.WHITE); } @Override protected void onLayout(boolean changed, int left, int top, int right, int bottom) { super.onLayout(changed, left, top, right, bottom); int w = getWidth(); int h = getHeight(); roundRectSet(w, h); } @Override public void draw(Canvas canvas) { canvasSetLayer(canvas); super.draw(canvas); canvas.restore(); } /** * 從新設定圓角 * @param adius */ public void setRectAdius(float adius) { rect_adius = adius; if (mView != null) { mView.invalidate(); } } /** * 圓角區域設定 * @param width * @param height */ public void roundRectSet(int width, int height) { roundRect.set(0, 0, width, height); } /** * 畫布區域裁剪 * @param canvas */ public void canvasSetLayer(Canvas canvas) { canvas.saveLayer(roundRect, zonePaint, Canvas.ALL_SAVE_FLAG); canvas.drawRoundRect(roundRect, rect_adius, rect_adius, zonePaint); // canvas.saveLayer(roundRect, maskPaint, Canvas.ALL_SAVE_FLAG); } }