Android实现触摸移动的悬浮窗口功能

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

<--! 说明一下，第一个权限是8.0之后悬浮窗窗口类型设置需要，第二个权限假如不加的话，我oppo手机跳转悬浮窗设置时，找不到这个app -->

package com.zh.pullrefresh;
 
import android.content.context;
import android.graphics.pixelformat;
import android.view.gravity;
import android.view.motionevent;
import android.view.viewconfiguration;
import android.view.viewgroup;
import android.view.windowmanager;
import android.widget.framelayout;
import android.widget.imageview;
 
import androidx.annotation.nonnull;
 
public class smallwindowsview extends framelayout {
 
  private int mslop;//触发移动事件的最小距离
  private float downx;//手指放下去的x坐标
  private float downy;//手指放下去的y坐标
  /**
   * 下面四个数据都为像素
   */
  private int screenwidth;//屏幕宽度
  private int screenheight;//屏幕高度
  private int viewwidth;//小窗的宽度
  private int viewheight;//小窗的高度
 
  private windowmanager wm;//窗口管理器，用来把view添加进窗口层
  private windowmanager.layoutparams wmparams;
 
  public smallwindowsview(@nonnull context context) {
    super(context);
    init();
  }
 
  private void init() {
    viewconfiguration vc = viewconfiguration.get(getcontext());
    mslop = vc.getscaledtouchslop();
    screenwidth = getcontext().getresources().getdisplaymetrics().widthpixels;
    screenheight = getcontext().getresources().getdisplaymetrics().heightpixels;
    viewwidth = dp2px(getcontext(), 130);
    viewheight = dp2px(getcontext(), 130);
 
    //可以根据你的实际情况在这个framelayout里添加界面控件之类的，
    // 我之前是用的实时音视频，把相关业务代码去掉了，直接放一个图标
    // 实际上就是拿到一个view从windowmanager给addview进去
    imageview imageview = new imageview(getcontext());
    imageview.setimageresource(r.mipmap.ic_launcher);
    layoutparams params = new layoutparams(viewgroup.layoutparams.match_parent,
        viewgroup.layoutparams.match_parent);
    addview(imageview, params);
  }
 
  //dp转px
  public int dp2px(context context, int dp) {
    return (int) (getdensity(context) * dp + 0.5);
  }
  public float getdensity(context context) {
    return context.getresources().getdisplaymetrics().density;
  }
 
  public void show() {
    wm = (windowmanager) getcontext().getsystemservice(context.window_service);
    wmparams = new windowmanager.layoutparams(
        viewwidth, viewheight,
        windowmanager.layoutparams.type_application_overlay,//8.0以上需要用这个权限
        windowmanager.layoutparams.flag_not_focusable
            | windowmanager.layoutparams.flag_not_touch_modal,
        pixelformat.translucent);
    wmparams.gravity = gravity.no_gravity;
    wmparams.x = screenwidth/2 - viewwidth/2;
    wmparams.y = screenheight/2 - viewheight/2;
    wm.addview(this, wmparams);
  }
 
  @override
  protected void onmeasure(int widthmeasurespec, int heightmeasurespec) {
    super.onmeasure(widthmeasurespec, heightmeasurespec);
    //本来想在这边直接设置宽高，但是有问题
//    setmeasureddimension(qmuidisplayhelper.dp2px(getcontext(), 130), qmuidisplayhelper.dp2px(getcontext(), 130));
  }
  //拦截触摸事件自己消费
  @override
  public boolean onintercepttouchevent(motionevent ev) {
    return true;
  }
  private long downtime;
  private float lastmovex;
  private float lastmovey;
  //消费触摸事件
  @override
  public boolean ontouchevent(motionevent event) {
    switch (event.getaction()) {
      case motionevent.action_down:
        downx = event.getrawx();
        downy = event.getrawy();
        lastmovex = downx;
        lastmovey = downy;
        downtime = system.currenttimemillis();
        break;
      case motionevent.action_move:
        float movex = event.getrawx();
        float movey = event.getrawy();
        //就两个坐标算他们距离要大于触发移动事件的最小距离
        //这里也可以减去lastmovex lastmovey 但是移动会有卡顿感 因此这里使用的还是downx downy
        if (math.pow(math.abs(movex - downx), 2) + math.pow(math.abs(movey - downy), 2) > math.pow(mslop, 2)) {
          updateviewposition(movex - lastmovex, movey - lastmovey);
          lastmovex = movex;
          lastmovey = movey;
        }
 
        break;
      case motionevent.action_up:
        float upx = event.getrawx();
        float upy = event.getrawy();
        long uptime = system.currenttimemillis();
        long time = uptime - downtime;
        //点击事件实现 点击小窗口消失
        //这里加了时间判断，是因为假如移动到原来的地方，也会触发成点击事件
        if (math.pow(math.abs(upx - downx), 2) + math.pow(math.abs(upy - downy), 2) < math.pow(mslop, 2) && time < 1000) {
          showrtcvideo();
        } else {
 
        }
        break;
    }
    return true;
  }
  private void showrtcvideo() {
    dismiss();
//    toast.maketext(getcontext(), "aaaaaaaaa", toast.length_short).show();
  }
 
  public void dismiss() {
    wm.removeview(this);
  }
 
  private void updateviewposition(float movex, float movey) {
    wmparams.gravity = gravity.no_gravity;
    //更新浮动窗口位置参数
    //    log.d("movex, movey", movex + "--" + movey);
    wmparams.x = (int) (wmparams.x + movex);
    wmparams.y = (int) (wmparams.y + movey);
    //    刷新显示
    wm.updateviewlayout(this, wmparams);
 
  }
}

@override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_main);
 
    final smallwindowsview smallwindowsview = new smallwindowsview(getapplicationcontext());
 
    button btshowwindow = findviewbyid(r.id.bt_show_window);
    btshowwindow.setonclicklistener(new view.onclicklistener() {
      @override
      public void onclick(view v) {
        if (build.version.sdk_int >= 23) {
          if (!(settings.candrawoverlays(mainactivity.this))) {
            intent intent = new intent(settings.action_manage_overlay_permission);
            intent.addflags(intent.flag_activity_new_task);
            startactivity(intent);
            return;
          }
        } else {
          if (!easypermissions.haspermissions(mainactivity.this, manifest.permission.system_alert_window)) {
            easypermissions.requestpermissions(mainactivity.this, "需要权限用以展示悬浮窗",
                2048, manifest.permission.system_alert_window);
            return;
          }
        }
        smallwindowsview.show();
      }
    });
  }