Android实现悬浮窗全系统版本

悬浮窗是在系统上显示的内容，好像微信视频聊天时的小窗口一样，在退出软件后依然存在的一个窗口，本博客以窗口中放一个button组件为例，简单展示悬浮窗，其中包括了对android 6.0以下、android 6.0到android 8.0、android 8.0以上版本的处理，下面开始介绍实现方法：

1、mainactivity中的代码

public button mfloatingbutton;
 
 @override
 protected void oncreate(bundle savedinstancestate) {
  super.oncreate(savedinstancestate);
  setcontentview(r.layout.activity_main);
 
  //初始化view
  initview();
 }
 //初始化view
 private void initview() {
  mfloatingbutton=(button) findviewbyid(r.id.floating_btn);
  mfloatingbutton.setonclicklistener(this);
 }
 
 public void startfloatingbuttonservice(view view) {
  log.e("测试流程", "测试流程");
  if (floatingservice_button.isstarted) {
   log.e("测试流程2", "测试流程2");
   return;
  }
  if (build.version.sdk_int >= build.version_codes.m) {//判断系统版本
   if (!settings.candrawoverlays(this)) {
    toast.maketext(this, "当前无权限，请授权", toast.length_short);
    log.e("测试流程3", "测试流程3");
    startactivityforresult(new intent(settings.action_manage_overlay_permission, uri.parse("package:" + getpackagename())), 0);
   } else {
    log.e("测试流程4", "测试流程4");
    startservice(new intent(mainactivity.this, floatingservice_button.class));
   }
  } else {
   startservice(new intent(mainactivity.this, floatingservice_button.class));
  }
 
 }
 
 @override
 protected void onactivityresult(int requestcode, int resultcode, intent data) {
  if (requestcode == 0) {
   if (!settings.candrawoverlays(this)) {
    log.e("测试流程5", "测试流程5");
    toast.maketext(this, "授权失败", toast.length_short).show();
   } else {
    log.e("测试流程6", "测试流程6");
    toast.maketext(this, "授权成功", toast.length_short).show();
    startservice(new intent(mainactivity.this, floatingservice_button.class));
   }
  }
 }
 
 @override
 public void onclick(view v) {
  switch (v.getid()){
   case r.id.floating_btn :
    startfloatingbuttonservice(v);
    break;
  }
 }

思路简单解释：点击弹出悬浮窗按钮时，获取版本并判断“build.version.sdk_int >= build.version_codes.m”如果系统版本在6.0以下这不需要请求权限，如果系统版本在6.0以上需要进行权限检测以及请求，获取权限后，弹出悬浮框

2、activity_main.xml代码

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical"
 tools:context="com.example.jack_lin.suspendwindow.mainactivity">
 
 <button
  android:id="@+id/floating_btn"
  style="@style/floatingbtn"
  android:text="@string/floating_btn" />
 
 
</linearlayout>

简单解释：xml中没什么特别东西，线性布局中放一个按钮

3、floatingservice_button的代码

public static boolean isstarted = false;
 
 private windowmanager windowmanager;
 private windowmanager.layoutparams layoutparams;
 
 private button button;
 
 @override
 public void oncreate() {
  super.oncreate();
  log.e("进入服务1", "进入服务1");
  isstarted = true;
  windowmanager = (windowmanager) getsystemservice(window_service);
  layoutparams = new windowmanager.layoutparams();
  if (build.version.sdk_int >= build.version_codes.o) {
   layoutparams.type = windowmanager.layoutparams.type_application_overlay;
  } else {
   layoutparams.type = windowmanager.layoutparams.type_phone;
  }
  layoutparams.format = pixelformat.rgba_8888;
  layoutparams.gravity = gravity.left | gravity.top;
  layoutparams.flags = windowmanager.layoutparams.flag_not_touch_modal | windowmanager.layoutparams.flag_not_focusable;
  layoutparams.width = 500;
  layoutparams.height = 100;
  layoutparams.x = 300;
  layoutparams.y = 300;
 }
 
 @nullable
 @override
 public ibinder onbind(intent intent) {
  log.e("进入服务2", "进入服务2");
 
  return null;
 }
 
 @override
 public int onstartcommand(intent intent, int flags, int startid) {
  log.e("进入服务3", "进入服务3");
  showfloatingwindow();
  return super.onstartcommand(intent, flags, startid);
 }
 
 private void showfloatingwindow() {
  if (build.version.sdk_int >= build.version_codes.m) {//判断系统版本
   if (settings.candrawoverlays(this)) {
    button = new button(getapplicationcontext());
    button.settext("我是个button窗口");
    button.setbackgroundcolor(color.blue);
    windowmanager.addview(button, layoutparams);
 
    button.setontouchlistener(new floatingontouchlistener());
   }
  } else {
   button = new button(getapplicationcontext());
   button.settext("我是个button窗口");
   button.setbackgroundcolor(color.blue);
   windowmanager.addview(button, layoutparams);
 
   button.setontouchlistener(new floatingontouchlistener());
  }
 }
 
 private class floatingontouchlistener implements view.ontouchlistener {
  private int x;
  private int y;
 
  @override
  public boolean ontouch(view view, motionevent event) {
   switch (event.getaction()) {
    case motionevent.action_down:
     x = (int) event.getrawx();
     y = (int) event.getrawy();
     break;
    case motionevent.action_move:
     int nowx = (int) event.getrawx();
     int nowy = (int) event.getrawy();
     int movedx = nowx - x;
     int movedy = nowy - y;
     x = nowx;
     y = nowy;
     layoutparams.x = layoutparams.x + movedx;
     layoutparams.y = layoutparams.y + movedy;
     windowmanager.updateviewlayout(view, layoutparams);
     break;
    default:
     break;
   }
   return false;
  }
 }

思路简单解释：首先获取windowmanager服务，然后定义并设置在window上显示的layoutparams（此处需注意android 8.0以上版本中layoutparam里的type变量变为type_application_overlay与android 8.0以下版本layoutparam里的type变量type_phone不一样，需要通过判断系统版本进行区分），然后定义并设置在layoutparams上面显示的button按钮以及监听事件（此处的监听事件主要是悬浮窗口拖动的监听）最后将设置好的button与layoutparams添加入window中

4、androidmanifest.xml中权限添加

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

5、效果图

源码下载地址：android悬浮窗 源码下载

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