【Android-Zxing框架】二维码扫描框区域大小与不同手机分辨率适配问题

Zxing框架进行二维码扫描时候会发现,随着分辨率的增加,扫描框会越来越小,SurfaceView扫描窗口就看不见了,我们可以自己定义扫描窗口的大小,以及适配屏幕问题。

 

 Zxing包中有个类CameraManager,它是来设置扫描框的大小

 扫描框框初始化数值

  private static  int MIN_FRAME_WIDTH = 240;
  private static  int MIN_FRAME_HEIGHT = 240;
  private static  int MAX_FRAME_WIDTH = 480;
  private static  int MAX_FRAME_HEIGHT = 360;

 

此类里面有个getFramingRect方法用来设置扫描的框的大小,如果要修改扫描框的大小可以在这个方法里修改

  public Rect getFramingRect() {
    Point screenResolution = configManager.getScreenResolution();
    if (framingRect == null) {
      if (camera == null) {
        return null;
      }

      MIN_FRAME_WIDTH = Dp2Px(context,180);
      MIN_FRAME_HEIGHT =Dp2Px(context,180);
      MAX_FRAME_WIDTH = Dp2Px(context,280);
      MAX_FRAME_HEIGHT =Dp2Px(context,240);

int width = screenResolution.x * 3 / 4; if (width < MIN_FRAME_WIDTH) { width = MIN_FRAME_WIDTH; } else if (width > MAX_FRAME_WIDTH) { width = MAX_FRAME_WIDTH; } int height = screenResolution.y * 3 / 4; if (height < MIN_FRAME_HEIGHT) { height = MIN_FRAME_HEIGHT; } else if (height > MAX_FRAME_HEIGHT) { height = MAX_FRAME_HEIGHT; } int leftOffset = (screenResolution.x - width) / 2; int topOffset = (screenResolution.y - height) / 2; framingRect = new Rect(leftOffset, topOffset, leftOffset + width, topOffset + height); Log.d(TAG, "Calculated framing rect: " + framingRect); } return framingRect; }

 

要让扫描框适应不同的分辨率,我们需要根据分辨率将扫描框的初始值转化就好。

      MIN_FRAME_WIDTH = Dp2Px(context,180);
      MIN_FRAME_HEIGHT =Dp2Px(context,180) ;
      MAX_FRAME_WIDTH = Dp2Px(context,280);
      MAX_FRAME_HEIGHT =Dp2Px(context,240) ;


dp转为px的方法为

  public static  int Dp2Px( Context context,float dp) { 
        final float scale = context.getResources().getDisplayMetrics().density; 
        return (int) (dp * scale + 0.5f); 
    }

 

posted @ 2017-11-23 16:02  发明创造小能手  阅读(2058)  评论(0编辑  收藏  举报
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