Question

我想创建一个游戏，我需要创建一个类，我将发送ImageView的ID，并且该类创建一个具有此id的对象，以便我可以在ImageView上运行所有类函数。

示例：

假设我有3个带有id的M1，M2和M3的ImageView。我想创建一个名为“myimg”的类，所以当我调用“myimg（M1）”时，该类创建一个对象，该对象将影响具有ID M1的“ImageView”并在M1上运行类“myimg”的所有函数。 / p>

public class myimg{

        private ImageView m;

        myimg(int id){
            m = (ImageView) findViewById(R.id...)

        }
    }

Answer 1

如果id值为R.id.XXXX，那么它将起作用：

 myimg(int id){
        m = (ImageView) findViewById(id);
    }

Id id是一个String，它的值是R.id.XXXX中的XXXX然后它将起作用：

myimg(String res) {
  int id = context.getResources().getIdentifier(res ,"id",getActivity().getPackageName());
  m = (ImageView) findViewById(id);
}

Answer 2

public class myimg{

    ImageView m1,m2,m3 ;
    ImageView chosenImageID ;

    m1 = (ImageView) findViewById(R.id.imageView);
    m2 = (ImageView) findViewById(R.id.imageView1);
    m3 = (ImageView) findViewById(R.id.imageView2);

    public ImageView myimg(ImageView id){
        chosenImageID = id;
        if(chosenImageID == m1)
            return m1;
        else if(chosenImageID == m2)
            return m2;
        else
            return m3;
    }
}

您可以使用myimg（ImageView）为您的其他方法确定所选的imageView。

Answer 3

抓住这个。

public class MyImage {

    private ImageView mImageView;
    private Activity mActivity;
    private ViewGroup mViewGroup;

    public MyImage(Activity activity) {
       mActivity = activity;
    }

    public MyImage(ViewGroup viewGroup) {
       mViewGroup = viewGroup;
    }

    public MyImage(Activity activity,int id) {
       mActivity = activity;
       mImageView = createViewById(id);
    }

    public MyImage(ViewGroup viewGroup,int id) {
       mViewGroup = viewGroup;
       mImageView = createViewById(id);
    }

    public ImageView createViewById(int id) {
        if (mActivity != null) {
            ImageView view = mAcitivity.findViewById(id);
            if (view == null)
                throw new IllegalStateException("Can't find resource with id = " + id);
            return view;
        }
        if (mViewGroup != null) {
            ImageView view = mViewGroup.findViewById(id);
            if (view == null)
                throw new IllegalStateException("Can't find resource with id = " + id);
            return view;
        }
        throw new IllegalStateException("Can't create view. Looks like a parent null.");
    }
}

使用

public void onCreate(...) {
    MyImage image = new MyImage(this,R.id.my_image);
    //Or
    MyImage image = new MyImage(this);
    image.createViewById(R.id.myImage);
}

注意：如果你将使用MyImage类，你应该确信ViewGroup（LinearLayout等）不是null。

如何为类动态创建findViewById（）

3 个答案:

使用