Android仿IOS悬浮拖动按钮

拖动效果

开发是我们有时候需要一些快捷通道，类似ios系统的拖动方块。
Android6.0及其以上版本手机使用悬浮窗功能会正常使用，在23及以上版本下编译，悬浮窗权限默认是关闭没有权限，然在23以下版本下编译悬浮窗权限是开启有权限的。所以在大于23版本下编译时需要去检测悬浮窗权限，并且获取悬浮窗权限，下面我就罗列下怎么去检测悬浮窗权限并且获取悬浮窗权限。

    int version = Build.VERSION.SDK_INT;
    // 悬浮窗Settings.canDrawOverlays获取权限是否开通
    if (version < 23 || (version >= 23 && Settings.canDrawOverlays(this))) {
        //初始化小方块的布局
        initDragLayout();
        return;
    }
    //弹出是否授权悬浮的dialog
    AuthorizationDialogFragment dialogFragment = new AuthorizationDialogFragment();
    dialogFragment.show(getSupportFragmentManager(), "AuthorizationDialogFragment");
    dialogFragment.setClickListener(new AuthorizationDialogFragment.onClickListener() {
        @Override
        public void click(int type) {
            if (type == 0) {
                mainFastView.setVisibility(View.VISIBLE);
                home_red_image.setVisibility(AppConstantUtils.isClickNewTask(context) ? View.GONE : View.VISIBLE);
            } else {
                try {
                    //同意开启悬浮权限
                    Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION);
                    startActivityForResult(intent, 10);
                } catch (Exception e) {

                }
            }
        }
    });

授权dialog
系统授权界面.jpg

授权之后返回

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == 10) {
        if (Build.VERSION.SDK_INT >= 23) {
            if (Settings.canDrawOverlays(this)) {
                 //初始化小方块的布局
                initDragLayout();
            } else {
                mainFastView.setVisibility(View.VISIBLE);
                home_red_image.setVisibility(AppConstantUtils.isClickNewTask(context) ? View.GONE : View.VISIBLE);
            }
        }
    }
}

@SuppressLint("ResourceAsColor")
public void showAddress() {
    if (AppConstantUtils.hasFastButton(this) && null != fast_image) return;
    SPUtils.put(this, "hasFastButton", "hasFastButton");
    wm = (WindowManager) getApplicationContext().getSystemService(Context.WINDOW_SERVICE);
    params = ((App) getApplicationContext()).getMywmParams();
    fast_image = LayoutInflater.from(getApplicationContext()).inflate(R.layout.fast_market_layout, null);
    fast_image.findViewById(R.id.image).setAlpha(0.68f);
    params.gravity = Gravity.LEFT | Gravity.TOP;
    params.x = (int) SPUtils.get(this, "lastx", 4 * ScreenUtils.getScreenWidth(this) / 5);
    params.y = (int) SPUtils.get(this, "lasty", 2 * ScreenUtils.getScreenHeight(this) / 3);
    params.height = ScreenUtils.dp2px(this, 48f);
    params.width = ScreenUtils.dp2px(this, 48f);
    View red_image = fast_image.findViewById(R.id.red_image);
    red_image.setVisibility(AppConstantUtils.isClickNewTask(context) ? View.GONE : View.VISIBLE);
    // 定义控件 可以触摸 删除一个flag
    params.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
    // | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON;
    params.format = PixelFormat.TRANSLUCENT;

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {//API26
        params.type = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;
    } else {
        params.type = WindowManager.LayoutParams.TYPE_PHONE;
    }
    wm.addView(fast_image, params);
    fast_image.setOnTouchListener(new View.OnTouchListener() {
        int startX;
        int startY;
        long startTime;
        long endTime;
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    startX = (int) event.getRawX();
                    startY = (int) event.getRawY();
                    startTime = System.currentTimeMillis();
                    break;
                case MotionEvent.ACTION_MOVE:
                    int newX = (int) event.getRawX();
                    int newY = (int) event.getRawY();
                    int dx = newX - startX;
                    int dy = newY - startY;
                    // 更改view对象在窗体上显示的位置.
                    params.x += dx;
                    params.y += dy;
                    if (params.x < 0) {
                        params.x = 0;
                    }
                    if (params.y < 0) {
                        params.y = 0;
                    }
                    if (params.x > wm.getDefaultDisplay().getWidth()) {
                        params.x = wm.getDefaultDisplay().getWidth();
                    }
                    if (params.y > wm.getDefaultDisplay().getHeight()) {
                        params.y = wm.getDefaultDisplay().getHeight();
                    }
                    wm.updateViewLayout(fast_image, params);
                    // 重新初始化手指的位置
                    startX = (int) event.getRawX();
                    startY = (int) event.getRawY();
                    break;
                case MotionEvent.ACTION_UP:
                    SPUtils.put(BaseAcyivity.this, "lastx", params.x);
                    SPUtils.put(BaseAcyivity.this, "lasty", params.y);
                    endTime = System.currentTimeMillis();
                    if (endTime - startTime < 300) {
                        EventBus.getDefault().post(new MessageEvent("showFast"));
                    }
                    return false;
            }
            return true;
        }
    });
}
// 权限添加
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />