最近公司項目愛用到圓角背景的RelativeLayout,一般圓角背景的實作思路無非就是兩種,第一種用.xml實作,需要用到.9圖檔,防止圖檔變形,如果要改變背景顔色的話,不可避免的要找美工妹子作圖,看着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,就是自已用代碼繪制一個,要改變角度,要改變顔色,改下設定就可以了,輕松又便捷,簡單又友善,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; //機關為像素
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);
}
}