Question

所以我有一个程序Gallery（用资源文件夹中的图片制作），一个按钮和一个ImageView

我想从图库中选择一个图像，按下按钮，然后更改ImageView位图以显示从图库中选择的图像...

我有从活动到活动的不断变化的方法都已修复...但我只是难以获得所选图像的 id ，整数，< strong> drawable ，long，string ......或者它有什么帮助...

以下是代码：

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.gallery);

            Gallery g = (Gallery) findViewById(R.id.gallery);
            g.setAdapter(new ImageAdapter(this));

            g.setOnItemClickListener(new OnItemClickListener() {
                public void onItemClick(AdapterView parent, View v, int position, long id) {

                    //CODE TO KNOW IF PICKED THE 1ST OR 2ND IMAGE

                    //Toast.makeText(Galeria.this, v.getId() + "", Toast.LENGTH_SHORT).show();
                    //Toast.makeText(Galeria.this, parent.getItemIdAtPosition(position) + "", Toast.LENGTH_SHORT).show();
                    //Toast.makeText(Galeria.this, id + "", Toast.LENGTH_SHORT).show();
                   }
            });
}

public class ImageAdapter extends BaseAdapter {
    int mGalleryItemBackground;
    private Context mContext;

    private Integer[] mImageId = {
            R.drawable.image1, //first image 
            R.drawable.image2, //second image
    };

    public ImageAdapter(Context c) {
        mContext = c;
        TypedArray a = c.obtainStyledAttributes(R.styleable.Gallery1);
        mGalleryItemBackground = a.getResourceId(R.styleable.Gallery1_android_galleryItemBackground, 0);
        a.recycle();
    }

    public int getCount() 
        return mImageId.length;         
    }

    public Object getItem(int position) {
        return position;
    }

    public long getItemId(int position) {
        return position;
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        ImageView i = new ImageView(mContext);          

        i.setImageResource(mImageId[position]); 

        i.setLayoutParams(new Gallery.LayoutParams(400, 225));
        i.setScaleType(ImageView.ScaleType.FIT_XY);
        i.setBackgroundResource(mGalleryItemBackground);

        return i;
    }
}

OnItemClick虚空中的三个Toast是我尝试显示id ...但只显示图库中图像的位置。

还有其他解决方案吗？我已经读过关于动力学的东西......但是可以理解......

我应该把代码放在哪里以获得我想要的ID？

任何帮助？感谢。

Answer 1

 g.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView parent, View v, int position, long id) {

                //CODE TO KNOW IF PICKED THE 1ST OR 2ND IMAGE
                int imageId = (Integer) (parent.getItemAtPosition(position));
                myImageView.setImageResource(imageId);
                //Toast.makeText(Galeria.this, v.getId() + "", Toast.LENGTH_SHORT).show();
                //Toast.makeText(Galeria.this, parent.getItemIdAtPosition(position) + "", Toast.LENGTH_SHORT).show();
                //Toast.makeText(Galeria.this, id + "", Toast.LENGTH_SHORT).show();
               }
        });

在你的适配器中，getItem应该返回数据集的对象

public Object getItem(int position) {
        return (mImageId[position]);
 }

Answer 2

您可以执行以下操作，将image view resource drawable作为itemClickListener：

(ImageView)view.getBackground()

这将返回图像作为所选图像视图资源的可绘制对象。

android - 从库中获取资源ID

2 个答案: