本文共 2739 字，大约阅读时间需要 9 分钟。

1.创建悬浮窗和显示

private void showFloatWindow() {        mResultTv = new TextView(mContext);        mResultTv.setBackgroundColor(mContext.getColor(R.color.float_bg));        mResultTv.setTextColor(mContext.getColor(R.color.white));        mResultTv.setOnTouchListener(new View.OnTouchListener() {            int lastX = 0;            int lastY = 0;            int paramX = 0;            int paramY = 0;            @Override            public boolean onTouch(View view, MotionEvent motionEvent) {                switch (motionEvent.getAction()) {                    case MotionEvent.ACTION_DOWN:                        lastX = (int) motionEvent.getRawX();                        lastY = (int) motionEvent.getRawY();                        paramX = mParams.x;                        paramY = mParams.y;                        break;                    case MotionEvent.ACTION_MOVE:                        int dx = (int) motionEvent.getRawX() - lastX;                        int dy = (int) motionEvent.getRawY() - lastY;                        mParams.x = paramX + dx;                        mParams.y = paramY + dy;                        // update float window                        mWm.updateViewLayout(mResultTv, mParams);                        break;                }                return true;            }        });        mParams = new WindowManager.LayoutParams();        mParams.width = WindowManager.LayoutParams.WRAP_CONTENT;        mParams.height = WindowManager.LayoutParams.WRAP_CONTENT;        // 悬浮窗的核心        mParams.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT;        // 设置浮动窗口不可聚焦（实现操作除浮动窗口外的其他可见窗口的操作）        mParams.flags = WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL                | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;        mParams.format = PixelFormat.TRANSPARENT;        mWm.addView(mResultTv, mParams);    }

2.隐藏悬浮窗

private void hideFloatWindow() {        mWm.removeView(mResultTv);    }

3.权限判断和添加

AndroidManifest.xml

//判断权限    private boolean isCanDrawOverlays(Context context) {        Boolean result = true;        if (Build.VERSION.SDK_INT >= 23) {            try {                Class clazz = Settings.class;                Method canDrawOverlays = clazz.getDeclaredMethod("canDrawOverlays", Context.class);                result = (Boolean) canDrawOverlays.invoke(null, context);            } catch (Exception e) {                e.printStackTrace();            }        }        return result;    }    //申请权限    private void requestAlertWindowPermission() {        Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION);        intent.setData(Uri.parse("package:" + mContext.getPackageName()));        startActivityForResult(intent, REQUEST_CODE);    }

4.UI 效果

5.完整源码下载