详解android6.0版本下悬浮窗实现

悬浮窗在安卓中实现起来还是比较容易的，这几天在网上温习了相关资料，运行在我安卓6.0手机上才发现，原来在6.0手机上不是行的。

第一反应肯定是权限相关问题，做了相关处理后，果然让悬浮窗原形毕露了。直接贴代码。

public class mainactivity extends appcompatactivity {
  private static final int alert_window_permission_code = 100;
  private button start_float;

  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_main);
    start_float = (button) findviewbyid(r.id.start_float);
    this.start_float.setonclicklistener(new view.onclicklistener() {
      @override
      public void onclick(view view) {
        if (build.version.sdk_int > 22) {
          sdk23permission();
        } else {
          startservice(new intent(mainactivity.this, floatservice.class));
          finish();
        }
      }
    });
  }

  /**
   * @description 安卓6.0下权限处理
   * @author ldm
   * @time 2017/3/20 15:00
   */
  public void sdk23permission() {
    if (!settings.candrawoverlays(this)) {
      toast.maketext(mainactivity.this, "当前无权限使用悬浮窗，请授权！", toast.length_short).show();
      intent intent = new intent(settings.action_manage_overlay_permission,
          uri.parse("package:" + getpackagename()));
      startactivityforresult(intent, alert_window_permission_code);
    } else {
      startservice(new intent(mainactivity.this, floatservice.class));
      finish();
    }
  }

  /**
   * 用户返回
   */
  protected void onactivityresult(int requestcode, int resultcode, intent data) {
    if (requestcode == alert_window_permission_code) {
      if (!settings.candrawoverlays(this)) {
        toast.maketext(mainactivity.this, "权限授予失败，无法开启悬浮窗", toast.length_short).show();
      } else {
        startservice(new intent(mainactivity.this, floatservice.class));
        finish();
      }

    }
  }
}

对应service:

public class floatservice extends service {
  @nullable
  @override
  public ibinder onbind(intent intent) {
    return null;
  }

  @override
  public void oncreate() {
    floatviewutils.getinstance(this).addfloatview();
    super.oncreate();
  }
}

简单地floatview:

public class floatview extends view {
  public static final int width = 150;
  public static final int height = 150;
  private paint circlepaint;
  private paint textpaint;
  private static final string text = "50%";

  public floatview(context context) {
    this(context, null, 0);
  }

  public floatview(context context, @nullable attributeset attrs) {
    this(context, attrs, 0);
  }

  public floatview(context context, @nullable attributeset attrs, int defstyleattr) {
    super(context, attrs, defstyleattr);
    initpaints();
  }

  /**
   * @description 初始化相关画笔paint
   * @author ldm
   * @time 2017/3/20
   */
  private void initpaints() {
    circlepaint = new paint();
    circlepaint.setantialias(true);
    circlepaint.setcolor(color.gray);
    textpaint = new paint();
    //设置抗锯齿
    textpaint.setantialias(true);
    //设置字体大小
    textpaint.settextsize(30);
    //设置颜色
    textpaint.setcolor(color.white);
    //设置（仿）粗体
    textpaint.setfakeboldtext(true);
  }

  @override
  protected void onmeasure(int widthmeasurespec, int heightmeasurespec) {
    setmeasureddimension(width, height);
  }

  @override
  protected void ondraw(canvas canvas) {
    super.ondraw(canvas);
    canvas.drawcircle(width / 2, height / 2, width / 2, circlepaint);
    float textwidth = textpaint.measuretext(text);
    float x = width / 2 - textwidth / 2;
    paint.fontmetrics fms = textpaint.getfontmetrics();
    float dy = -(fms.descent + fms.ascent) / 2;
    float y = height / 2 + dy;
    canvas.drawtext(text, x, y, textpaint);
  }
}

以及floatview管理工具类：

public class floatviewutils {
  private static floatviewutils instance;
  private context mcontext;
  private windowmanager manager;
  private floatview floatview;

  private floatviewutils(context mcontext) {
    this.mcontext = mcontext;
    manager = (windowmanager) mcontext.getsystemservice(context.window_service);
    floatview = new floatview(mcontext);
  }

  public static floatviewutils getinstance(context mcontext) {
    if (null == instance) {
      synchronized (floatviewutils.class) {
        if (null == instance) {
          instance = new floatviewutils(mcontext);
        }
      }
    }
    return instance;
  }

  public void addfloatview() {
    windowmanager.layoutparams lp = new windowmanager.layoutparams();
    //悬浮窗口大小
    lp.width = floatview.width;
    lp.height = floatview.height;
    // 调整悬浮窗口位置
    lp.gravity = gravity.left | gravity.center;
    // 以屏幕左上角为原点，设置x、y初始值
//    lp.x = 0;
//    lp.y = 0;
    //设置悬浮窗口类型
    lp.type = windowmanager.layoutparams.type_phone;
    //设置悬浮窗口不接受焦点及触摸事件
    lp.flags = windowmanager.layoutparams.flag_not_focusable | windowmanager.layoutparams.flag_not_touchable;
    //设置图片格式，效果为背景透明
    lp.format = pixelformat.rgba_8888;
    manager.addview(floatview, lp);
  }
}

最后不要忘记在androidmanifest.xml中添加权限（当然还有注册service）：

<uses-permission android:name="android.permission.system_alert_window"/>

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。