Android 实现自定义圆形listview功能的实例代码

最近遇到一个需求需要圆形listview作为悬浮窗，费了九牛二虎之力终于开发出来了，特别有成就感，下面分享下案例，项目原因，只能分享一部分供大家参考
1.有图有真相

下面就来讲解下代码：
1.自定义listview

import android.content.context;
import android.content.res.typedarray;
import android.graphics.bitmap;
import android.graphics.bitmapfactory;
import android.graphics.canvas;
import android.graphics.paint;
import android.graphics.rect;
import android.util.attributeset;
import android.view.view;
import android.view.viewgroup;

public class circlelistview extends viewgroup {

  private static final double intervalangel = 60;//子view之间的间隔角
  int circler;//圆的半径
  int ccx;//圆心的x轴坐标
  int ccy;//圆心的y轴坐标
  double angel = 0;//偏移角度
  private float oldtouchy;//上一次触摸的y轴位置
  private boolean isscrolling = false;//是否在滑动状态
  private bitmap circlebitmap = null;
  private rect src;
  private rect dst;
  private paint paint;
  private adapter adapter = new adapter(this) {
    @override
    public view getview(int position) {
      return new view(getcontext());
    }
  };

  public circlelistview(context context) {
    super(context);
    setwillnotdraw(false);
    paint = new paint();
  }

  public circlelistview(context context, attributeset attrs) {
    super(context, attrs);
    setwillnotdraw(false);
    paint = new paint();
//    typedarray ta = context.obtainstyledattributes(attrs, r.styleable.circlelistview);
//    setcirclebitmap(ta.getresourceid(r.styleable.circlelistview_circledrawable, 0));
//    ta.recycle();
  }

  private void setcirclebitmap(int drawableid) {
    if (drawableid != 0) {
      circlebitmap = bitmapfactory.decoderesource(getresources(), drawableid);
    } else {
      circlebitmap = null;
    }
  }

  public void setadapter(adapter adapter) {
    this.adapter = adapter;
    refreshlist();
  }

  @override
  protected void onmeasure(int widthmeasurespec, int heightmeasurespec) {
    measurechildren(widthmeasurespec, heightmeasurespec);
    super.onmeasure(widthmeasurespec, heightmeasurespec);
  }

  @override
  protected void ondraw(canvas canvas) {
    super.ondraw(canvas);
    if (circlebitmap != null) {
      if (src == null) {
        src = new rect();
      }
      src.left = 0;
      src.top = 0;
      src.right = circlebitmap.getwidth();
      src.bottom = circlebitmap.getheight();
      if (dst == null) {
        dst = new rect();
      }
      dst.left = ccx - circlebitmap.getwidth()/4;
      dst.top = ccy - circlebitmap.getheight()/4;
      dst.right = ccx + circlebitmap.getwidth()/4;
      dst.bottom = ccy + circlebitmap.getheight()/4;
      canvas.drawbitmap(circlebitmap, src, dst, paint);
    }
  }

  @override
  protected void onlayout(boolean changed, int l, int t, int r, int b) {
    circler = (getright() - getleft()) / 10 * 5;
    ccy = (int) (getheight() * 0.5);
    ccx = getwidth() / 2;
    for (int i = 0; i < adapter.getcount(); i++) {
      view childview = getchildat(i);
      double childviewangel = i * intervalangel + angel;
      int x = ccx + (int) (math.sin(math.toradians(childviewangel)) * circler*0.6);
      int y = ccy - (int) (math.cos(math.toradians(childviewangel)) * circler*0.6);
      int vl = x - childview.getmeasuredwidth() / 2;
      int vt = y - childview.getmeasuredheight() / 2;
      int vr = x + childview.getmeasuredwidth() / 2;
      int vb = y + childview.getmeasuredheight() / 2;
      childview.layout(vl, vt, vr, vb );
    }
  }

//  @override
//  public boolean dispatchtouchevent(motionevent ev) {
//    switch (ev.getaction()) {
//      case motionevent.action_down:
//        oldtouchy = ev.gety();
//        super.dispatchtouchevent(ev);
//        return true;
//      case motionevent.action_move:
//        if (!isscrolling && math.abs(oldtouchy - ev.gety()) > 50) {
//          isscrolling = true;
//          float offsety = 0;
//          oldtouchy = ev.gety();
//          angel += offsety / 20;
//          requestlayout();
//          return true;
//        } else if (isscrolling) {
//          float offsety = ev.gety() - oldtouchy;
//          oldtouchy = ev.gety();
//          if ((angel + offsety / 20) < ((adapter.getcount() - 1) * -intervalangel)) {
//            angel = (adapter.getcount() - 1) * -intervalangel;
//          } else if ((angel + offsety / 20) > 0) {
//            angel = 0;
//          } else {
//            angel += offsety / 20;
//          }
//          requestlayout();
//          return true;
//        }
//        return super.dispatchtouchevent(ev);
//      case motionevent.action_up:
//        boolean notdispatch = isscrolling;
//        isscrolling = false;
//        if (notdispatch) {
//          return false;
//        } else {
//          performclick();
//          return super.dispatchtouchevent(ev);
//        }
//      default:
//        isscrolling = false;
//        return super.dispatchtouchevent(ev);
//    }
//  }

  protected void refreshlist() {
    removeallviews();
    for (int i = 0; i < adapter.getcount(); i++) {
      if (i == 0 && angel < -intervalangel * (adapter.getcount() - 1)) {
        angel = -intervalangel * (adapter.getcount() - 1);
      }
      addview(adapter.getview(i));
      if (adapter.getcount() == 1) {
        setposition(0);
      }
    }
    invalidate();
  }

  protected void setposition(int position) {
    angel = -position * intervalangel;
  }
}

2.实体类

import android.graphics.drawable.drawable;

public class files {
  private int id;

  public int getid() {
    return id;
  }

  public void setid(int id) {
    this.id = id;
  }

  public string getapp_name() {
    return app_name;
  }

  public void setapp_name(string app_name) {
    this.app_name = app_name;
  }

  public string getpackagename() {
    return packagename;
  }

  public void setpackagename(string packagename) {
    this.packagename = packagename;
  }

  public int getimg_bg_id() {
    return img_bg_id;
  }

  public void setimg_bg_id(int img_bg_id) {
    this.img_bg_id = img_bg_id;
  }

  public boolean isshow() {
    return isshow;
  }

  public void setshow(boolean show) {
    isshow = show;
  }
  private drawable imgdrawable;

  public drawable getimgdrawable() {
    return imgdrawable;
  }

  public void setimgdrawable(drawable imgdrawable) {
    this.imgdrawable = imgdrawable;
  }

  private boolean isshow;
  private string app_name;
  private string packagename;
  private int img_bg_id;
}

3.适配器

import android.view.view;

import java.util.arraylist;

public abstract class adapter {

  private circlelistview circlelistview;
  private arraylist<files> allapplist;
  public adapter(circlelistview circlelistview) {
    this.circlelistview = circlelistview;
  }

  public int getcount() {
    return allapplist.size();
  }

  public abstract view getview(int position);

  public void notifydatachanged() {
    circlelistview.refreshlist();
  }

  public void setposition(int position) {
    if (position > getcount() - 1) {
      position = getcount() - 1;
    } else if (position < 0) {
      position = 0;
    }
    circlelistview.setposition(position);
  }
}

4.float.xml 引用：

<?xml version="1.0" encoding="utf-8"?>
<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent">

  <imageview
    android:id="@+id/float_btn"
    android:layout_width="79px"
    android:layout_height="79px"
    android:scaletype="fitcenter"
    android:layout_centerinparent="true"
    android:background="@drawable/main_selector_floatbtn"
    android:clickable="true"
    />
  <relativelayout
    android:id="@+id/float_area"
    android:layout_width="300px"
    android:layout_height="300px"
    android:layout_centerinparent="true"
    android:background="@drawable/float_display_bg"
    android:visibility="gone">
    <com.xinrui.headsettest.circlelistview.circlelistview
      android:id="@+id/circle_list_view"
      android:layout_width="300px"
      android:layout_height="300px"
      android:layout_centerhorizontal="true"/>
    <imageview
      android:id="@+id/float_main_img"
      android:layout_width="70px"
      android:layout_height="70px"
      android:scaletype="fitcenter"
      android:layout_centerinparent="true"
      android:background="@drawable/float_main_icon"
      android:clickable="true"/>
  </relativelayout>
</relativelayout>

5.activity中应用：

import android.app.activity;
import android.os.bundle;
import android.provider.contactscontract;
import android.view.layoutinflater;
import android.view.view;
import android.widget.imageview;
import android.widget.relativelayout;
import android.widget.textview;
import android.widget.toast;

import com.xinrui.headsettest.circlelistview.adapter;
import com.xinrui.headsettest.circlelistview.circlelistview;
import com.xinrui.headsettest.circlelistview.files;
import java.util.arraylist;

public class floatactivity extends activity implements view.onclicklistener{
  private imageview floatimg, float_main_img;
  private relativelayout float_area;
  private circlelistview circle_list_view;
  private adapter adapter;
  private arraylist<files> appdatalist;
  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.float_layout);
    getdata();
    init();
  }

  private void getdata(){
    appdatalist=new arraylist<>();
    files files = new files();
    files.setapp_name(this.getresources().getstring(r.string.calculator_txt));
    files.setimg_bg_id(r.drawable.main_selector_calculator);
    appdatalist.add(files);
    files files0 = new files();
    files0.setapp_name(this.getresources().getstring(r.string.calendar_txt));
    files0.setimg_bg_id(r.drawable.main_selector_calendar);
    appdatalist.add(files0);
    files files1 = new files();
    files1.setapp_name(this.getresources().getstring(r.string.timer_txt));
    files1.setimg_bg_id(r.drawable.main_selector_clock);
    appdatalist.add(files1);
    files files2 = new files();
    files2.setapp_name(this.getresources().getstring(r.string.vip_txt));
    files2.setimg_bg_id(r.drawable.main_selector_vip);
    appdatalist.add(files2);
    files files3 = new files();
    files3.setapp_name(this.getresources().getstring(r.string.screen_shots_txt));
    files3.setimg_bg_id(r.drawable.main_selector_screenshot);
    appdatalist.add(files3);
    files files4 = new files();
    files4.setapp_name(this.getresources().getstring(r.string.recording_screen_txt));
    files4.setimg_bg_id(r.drawable.main_selector_recordingscreen);
    appdatalist.add(files4);
  }

  private void init() {
    float_area = (relativelayout) findviewbyid(r.id.float_area);
    floatimg = (imageview) findviewbyid(r.id.float_btn);
    float_main_img = (imageview) findviewbyid(r.id.float_main_img);
    float_main_img.bringtofront();
    floatimg.setonclicklistener(this);
    float_main_img.setonclicklistener(this);
    circle_list_view = findviewbyid(r.id.circle_list_view);
    adapter = new adapter(circle_list_view) {
      @override
      public view getview(final int position) {
        view view = layoutinflater.from(floatactivity.this).inflate(r.layout.item_app,null);
        textview app_name = view.findviewbyid(r.id.app_name);
        imageview app_img = view.findviewbyid(r.id.app_img);
        imageview delete_img = view.findviewbyid(r.id.delete_icon);
        delete_img.bringtofront();
        final files files = appdatalist.get(position);
        app_name.settext(files.getapp_name());
        app_img.setimageresource(files.getimg_bg_id());
        if(files.isshow()){
          delete_img.setvisibility(view.visible);
        }else{
          delete_img.setvisibility(view.invisible);
        }
        delete_img.setonclicklistener(new view.onclicklistener() {
          @override
          public void onclick(view v) {
            appdatalist.remove(position);
            files file = new files();
            file.setshow(false);
            file.setimg_bg_id(r.drawable.main_selector_additem);
            file.setapp_name(floatactivity.this.getresources().getstring(r.string.custom_txt));
            appdatalist.add(position,file);
            adapter.notifydatachanged();
          }
        });
        view.setonclicklistener(new view.onclicklistener() {
          @override
          public void onclick(view v) {
            toast.maketext(floatactivity.this,"my is "+files.getapp_name(),toast.length_short).show();
          }
        });
        view.setonlongclicklistener(new view.onlongclicklistener() {
          @override
          public boolean onlongclick(view v) {
            if(!files.getapp_name().equals(floatactivity.this.getresources().getstring(r.string.custom_txt))) {
              for (files file : appdatalist) {
                if (file.getapp_name().equals(files.getapp_name())) {
                  file.setshow(true);
                } else {
                  file.setshow(false);
                }
              }
              adapter.notifydatachanged();
            }
            return true;
          }
        });
        return view;
      }
      @override
      public int getcount() {
        return appdatalist.size();
      }
    };
    circle_list_view.setadapter(adapter);
    adapter.setposition(0);
  }

  @override
  public void onclick(view v) {
    switch (v.getid()) {
      case r.id.float_main_img:
        float_area.setvisibility(view.gone);
        floatimg.setvisibility(view.visible);
        break;
      case r.id.float_btn:
        float_area.setvisibility(view.visible);
        floatimg.setvisibility(view.gone);
        break;
    }
  }
}

大功告成就这样实现了圆形listview…

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