自定义view实现未读消息提示（小红点）

来源：互联网发布：java数字金字塔代码编辑：程序博客网时间：2024/06/05 06:30

转载：http://blog.csdn.net/qq_28268507/article/details/70314844

自定义view继承RadioButton

public class NotifyRadioButton extends RadioButton {Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);float radius;boolean notify;public NotifyRadioButton(Context context, AttributeSet attrs) {    super(context, attrs);    paint.setColor(Color.RED);    radius = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_PX, 12.0f, context.getResources().getDisplayMetrics());}@Overrideprotected void onDraw(Canvas canvas) {    super.onDraw(canvas);    if (notify) {      //获取到DrawableTop,  0 drawableleft 1 drawabletop 2 drawableright 3 drawablebottom        Drawable drawable = getCompoundDrawables()[1];         //获取到Drawable的left right top bottom的值        Rect bounds = drawable.getBounds();        //float cx, float cy, float radius, @NonNull Paint paint        float cx = getMeasuredWidth() / 2 + bounds.width() / 2 - radius / 2;        float cy = getPaddingTop() + bounds.height() / 4;        canvas.drawCircle(cx, cy, radius, paint);    }}/** * 新消息提醒 * * @param notify */public void notify(boolean notify) {    this.notify = notify;    invalidate();}}

在代码中，通过id找到控件，调用notify(true),就可看到小红点的显示

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