java - 如何根据动态可绘制名称设置 PNG 图像

Question

如何根据动态可绘制名称设置 PNG 图像？

我使用以下代码来获取错误。

我有 PNG:

R.drawable.model_1.png
R.drawable.model_2.png
... and etc

代码

try
{
    String imageName = "model_" + uv.categoryID;
    int id = context.getResources().getIdentifier(imageName, "drawable", context.getPackageName());
    imageView.setImageResource(id);
}
catch(Exception ex)
{
    Log.e(TAG, ex);
}

错误

Attempt to invoke virtual method 'void android.widget.ImageView.setImageResource(int)' on a null object reference

Answer 1

试试这个:

    try
    {
        ImageView imageView = (ImageView)findViewById(R.id.imageView);
        int categoryID = 0;
        String imageName = "model_" + categoryID;
        int id = this.getResources().getIdentifier(imageName, "drawable", this.getPackageName());
        imageView.setImageResource(id);
    }
    catch(Exception ex)
    {
        Log.e("NIKHIL", ex.toString());
    }