前言
本文例子实现了点击显示悬浮窗口,同时窗口可播放视频,拖动位置,点击关闭及返回 APP
页面,通过例子来讲述悬浮窗口实现原理及细节处理,效果图如下所示:
悬浮窗口.gif
原理
WindowManager
对 View
视图进行添加、移除、更新处理;
WindowManager.LayoutParams
对窗口参数进行一系列设置。
实现
首先,需要添加相对应悬浮窗权限:
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
在 Activity
页面中,需要判断悬浮窗权限是否获取,如果未曾获取,需要跳转系统页,进行对应的授权操作:
public boolean requestOverlayPermission() { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) { if (!Settings.canDrawOverlays(this)) { Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION, Uri.parse("package:" + getPackageName())); startActivityForResult(intent, REQUEST_OVERLAY_CODE); return true; } else { return false; } } return false; }
获取权限后,我们可以首先初始化我们要显示的视图,并且设置相对应的事件,这里我们采用了 VideoView
进行简单的视频播放,并且设置悬浮窗关闭及返回前台的操作:
private View initFloatView() { View view = View.inflate(this, R.layout.view_floating_window, null); // 设置视频封面 final ImageView mThumb = (ImageView) view.findViewById(R.id.thumb_floating_view); Glide.with(this).load(R.drawable.thumb).into(mThumb); // 悬浮窗关闭 view.findViewById(R.id.close_floating_view).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { mFloatingWindow.dismiss(); } }); // 返回前台页面 view.findViewById(R.id.back_floating_view).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { mFloatingWindow.setTopApp(FloatingWindowActivity.this); } }); final VideoView videoView = view.findViewById(R.id.video_view); //视频内容设置 videoView.setVideoPath("https://stream7.iqilu.com/10339/article/202002/18/2fca1c77730e54c7b500573c2437003f.mp4"); // 视频准备完毕,隐藏正在加载封面,显示视频 videoView.setOnPreparedListener(new MediaPlayer.OnPreparedListener() { @Override public void onPrepared(MediaPlayer mp) { mThumb.setVisibility(View.GONE); } }); // 循环播放 videoView.setOnCompletionListener(new MediaPlayer.OnCompletionListener() { @Override public void onCompletion(MediaPlayer mp) { videoView.start(); } }); // 开始播放视频 videoView.start(); return view; }
通过获取窗口管理 WindowManager
,设置悬浮窗口参数 WindowManager.LayoutParams
后,就可以通过 WindowManager
的 addView
方法,生成对应视图的悬浮窗口:
public void showFloatingWindowView(Context context, View view) { // 悬浮窗显示视图 mShowView = view; // 获取系统窗口管理服务 mWindowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE); // 悬浮窗口参数设置及返回 mFloatParams = getParams(); // 设置窗口触摸移动事件 mShowView.setOnTouchListener(new FloatViewMoveListener()); // 悬浮窗生成 mWindowManager.addView(mShowView, mFloatParams); }
WindowManager.LayoutParams
参数设置,主要设置悬浮窗口类型为 WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY
:
private WindowManager.LayoutParams getParams() { WindowManager.LayoutParams layoutParams = new WindowManager.LayoutParams(); //设置悬浮窗口类型 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { layoutParams.type = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY; } else { layoutParams.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT; } //设置悬浮窗口属性 layoutParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE | WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL | WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN | WindowManager.LayoutParams.FLAG_LAYOUT_INSET_DECOR | WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH; //设置悬浮窗口透明 layoutParams.format = PixelFormat.TRANSLUCENT; //设置悬浮窗口长宽数据 layoutParams.width = 600; layoutParams.height = 340; //设置悬浮窗显示位置 layoutParams.gravity = Gravity.START | Gravity.TOP; layoutParams.x = 100; layoutParams.y = 100; return layoutParams; }
窗口触摸移动事件,主要通过获取触摸位置,通过 WindowManager
的 updateViewLayout
方法设置悬浮窗口的参数,进行窗口视图位置更新:
private class FloatViewMoveListener implements View.OnTouchListener { //开始触控的坐标,移动时的坐标(相对于屏幕左上角的坐标) private int mTouchStartX; private int mTouchStartY; //开始时的坐标和结束时的坐标(相对于自身控件的坐标) private int mStartX, mStartY; //判断悬浮窗口是否移动,这里做个标记,防止移动后松手触发了点击事件 private boolean isMove; @Override public boolean onTouch(View view, MotionEvent motionEvent) { int action = motionEvent.getAction(); int x = (int) motionEvent.getX(); int y = (int) motionEvent.getY(); switch (action) { case MotionEvent.ACTION_DOWN: isMove = false; mTouchStartX = (int) motionEvent.getRawX(); mTouchStartY = (int) motionEvent.getRawY(); mStartX = x; mStartY = y; break; case MotionEvent.ACTION_MOVE: int mTouchCurrentX = (int) motionEvent.getRawX(); int mTouchCurrentY = (int) motionEvent.getRawY(); mFloatParams.x += mTouchCurrentX - mTouchStartX; mFloatParams.y += mTouchCurrentY - mTouchStartY; mWindowManager.updateViewLayout(mShowView, mFloatParams); mTouchStartX = mTouchCurrentX; mTouchStartY = mTouchCurrentY; float deltaX = x - mStartX; float deltaY = y - mStartY; if (Math.abs(deltaX) >= 5 || Math.abs(deltaY) >= 5) { isMove = true; } break; case MotionEvent.ACTION_UP: break; default: break; } //如果是移动事件不触发OnClick事件,防止移动的时候一放手形成点击事件 return isMove; } }
关闭悬浮窗,调用 WindowManager
的 removeView
方法即可:
public void dismiss() { if (mWindowManager != null && mShowView != null) { mWindowManager.removeView(mShowView); } }
悬浮窗点击返回前台方法:
public void setTopApp(Context context) { //获取ActivityManager ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE); //获得当前运行的task(任务) List<ActivityManager.RunningTaskInfo> taskInfoList = null; if (activityManager != null) { taskInfoList = activityManager.getRunningTasks(100); } if (taskInfoList != null) { for (ActivityManager.RunningTaskInfo taskInfo : taskInfoList) { //找到本应用的 task,并将它切换到前台 if (taskInfo.topActivity != null && taskInfo.topActivity.getPackageName().equals(context.getPackageName())) { activityManager.moveTaskToFront(taskInfo.id, 0); break; } } } }
关于悬浮窗的一些基本操作到这里就基本结束了,具体的布局内容及操作,欢迎查看具体的源码实现: Github开发记录