android开发分享Android实现未读消息小红点显示实例

目录

• 代码实现
• 小红点实现
• 总结

import android.graphics.canvas;  import android.graphics.colorfilter;  import android.graphics.paint;  import android.graphics.pixelformat;  import android.graphics.drawable.drawable;  import android.graphics.drawable.shapedrawable;    import androidx.annotation.intrange;  import androidx.annotation.nonnull;  import androidx.annotation.nullable;      public class circledrawable extends shapedrawable {      private paint mpaint;      private int mradio;        public circledrawable(int radio, int paincolor) {          mpaint = new paint();          mpaint.setantialias(true);          mpaint.setcolor(paincolor);          mradio = radio;      }        @override      public void draw(@nonnull canvas canvas) {          canvas.drawcircle(mradio, mradio, mradio, mpaint);      }        @override      public void setalpha(@intrange(from = 0, to = 255) int i) {          mpaint.setalpha(i);      }        @override      public void setcolorfilter(@nullable colorfilter colorfilter) {          mpaint.setcolorfilter(colorfilter);      }        @override      public int getopacity() {          return pixelformat.translucent;      }        /***       * drawable实际宽高，圆形关键       *       * @return       */      @override      public int getintrinsicwidth() {          return mradio * 2;      }        @override      public int getintrinsicheight() {          return mradio * 2;      }  }    

import android.content.context;  import android.graphics.canvas;  import android.graphics.color;  import android.graphics.rect;  import android.graphics.drawable.colordrawable;  import android.graphics.drawable.shapedrawable;  import android.graphics.drawable.shapes.ovalshape;  import android.graphics.drawable.shapes.roundrectshape;  import android.util.attributeset;  import android.util.printer;  import android.view.gravity;  import android.view.view;  import android.view.viewgroup;  import android.widget.framelayout;  import android.widget.textview;    import androidx.annotation.nullable;    import com.primer.common.constant.gravitydirection;  import com.primer.common.mvp.logininterface;  import com.primer.common.util.loghelper;  import com.primer.common.util.uihelper;  import com.primer.common.view.drawable.circledrawable;    public class badgeview extends textview {        private final int default_badge_radio = 5;      private final int default_text_size = 5;      private final int default_text_color = color.white;      private final int default_badge_color = color.red;      private final int default_badge_gravity = gravitydirection.direct_top_left;        private string mtext;      private int mbadgecolor = default_badge_color;      private int mtextcolor = default_text_color;      private int mtextsize = default_text_size;      private int mbadgeradio = default_badge_radio;      private int mbadgegravity = default_badge_gravity;        private framelayout mfragmentlayout;      private viewgroup mtargetviewgroup;      private view mtarget;      private context mcontext;        public badgeview(context context) {          super(context);          init(context);      }        public badgeview(context context, @nullable attributeset attrs) {          super(context, attrs);          init(context);      }        public badgeview(context context, @nullable attributeset attrs, int defstyleattr) {          super(context, attrs, defstyleattr);          init(context);      }        public badgeview(context context, @nullable attributeset attrs, int defstyleattr, int defstyleres) {          super(context, attrs, defstyleattr, defstyleres);          init(context);      }        private void init(context context) {          mfragmentlayout = new framelayout(context);          mfragmentlayout.setlayoutparams(new framelayout.layoutparams(                  viewgroup.layoutparams.match_parent, viewgroup.layoutparams.match_parent));          mcontext = context;      }        /***       *       * @param content       * @param target       * @param textcolor       * @param textsize       * @param badgecolor       * @param badgeradio       */      public void showbadgeview(string content, view target, int textcolor, int textsize, int badgecolor, int badgeradio) {          if (target == null) {              throw new illegalargumentexception("target view must not be null");          }            mtarget = target;          mtargetviewgroup = (viewgroup) target.getparent();          mtargetviewgroup.removeview(target);          mtargetviewgroup.addview(mfragmentlayout, target.getlayoutparams());            settextcolor(mtextcolor);          settextsize(mtextsize);          setgravity(gravity.center);          if (content != null && content.length() <= 3) {              settext(content);          }              //文字和半径之间的适配          if (content != null) {              rect rect = new rect();              this.getpaint().gettextbounds(content, 0, content.length(), rect);              if (content.length() <= 3 && rect.width() >= mbadgeradio) {                  mbadgeradio = (uihelper.px2dip(mcontext, rect.width()) / 2) + 1;              }          }            setbackgrounddrawable(getshapedrawable());          mfragmentlayout.addview(target);          mfragmentlayout.addview(this);          mtargetviewgroup.invalidate();      }          private shapedrawable getshapedrawable() {          int radio = uihelper.dip2px(mcontext, mbadgeradio);          circledrawable drawable = new circledrawable(radio, mbadgecolor);          return drawable;      }        /***       *       * @param content       * @param target       */      public void showbadgeview(string content, view target) {          showbadgeview(content, target,                  default_text_color,                  default_text_size,                  default_badge_color,                  default_badge_radio);      }        public void showbadgeview(view target) {          showbadgeview(null, target,                  default_text_color,                  default_text_size,                  default_badge_color,                  default_badge_radio);      }        @override      protected void onmeasure(int widthmeasurespec, int heightmeasurespec) {          super.onmeasure(widthmeasurespec, heightmeasurespec);      }        @override      protected void ondraw(canvas canvas) {          super.ondraw(canvas);      }        @override      protected void onlayout(boolean changed, int left, int top, int right, int bottom) {          super.onlayout(changed, left, top, right, bottom);      }  }    

    private badgeview mreadbadgeview;      private textview mread;    	mreadbadgeview = new badgeview(getactivity());      mreadbadgeview.showbadgeview("+99", mread);