Android LayoutFlater中的空指针异常

我创建了一个Bean类，在这个类中我们获取并设置name和image的值，并创建了另外两个类。 我制作了

MainActivity

类和

ListAdapterPlay

类，我想在其中设置listView项中的图像。 但是在

LayoutInflater

public class ListAdapterPlay extends BaseAdapter {
// private Bean bean;
private ArrayList<Bean> objarraylist;
private Context context;
private LayoutInflater objlayoutinflater;

public ListAdapterPlay(ArrayList<Bean> objarraylist, Context context) {
    this.context = context;
    this.objarraylist = objarraylist;
    objlayoutinflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); //error at this line 
    // TODO Auto-generated constructor stub
}

@Override
public int getCount() {
    // TODO Auto-generated method stub
    return 0;
}

@Override
public Object getItem(int position) {
    // TODO Auto-generated method stub
    return position;
}

@Override
public long getItemId(int position) {
    // TODO Auto-generated method stub
    return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    Bean bean = (Bean) getItem(position);
    convertView = objlayoutinflater.inflate(R.layout.listviewrow,null);
    // TODO Auto-generated method stub
    TextView txt = (TextView) convertView.findViewById(R.id.textView1);
    // bean= new Bean();
    txt.setText(bean.getName());

    ImageView img = (ImageView) convertView.findViewById(R.id.imageView1);
    String uri = "drawable/" + bean.getImage();
    int imageResource = context.getResources().getIdentifier(uri, null,
            context.getPackageName());
    Drawable image = context.getResources().getDrawable(imageResource);
    img.setImageDrawable(image);
    // img.setBackgroundResource()

    return convertView;
}
}

我想在listView项中设置图像，但它是通过

ListAdapterPlay

类中的

NullPointerException

设置的。 错误在这一行

objlayoutinflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

我被困在这种情况下为什么？它给出

空点异常

public ListAdapterPlay(ArrayList<Bean> objarraylist, Context context) {
    this.context = context;
    this.objarraylist = objarraylist;
    objlayoutinflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); //error at this line 
    // TODO Auto-generated constructor stub
}

在构造

列表适配器播放时

试一试

---

在哪一行，ListAdapterPlay中出现空指针异常。

public ListAdapterPlay(ArrayList<Bean> objarraylist, Context context) {
    this.context = context;
    this.objarraylist = objarraylist;
    objlayoutinflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); //error at this line 
    // TODO Auto-generated constructor stub
}

objlistadapter= new ListAdapterPlay(objarraylist,context);

objlistadapter= new ListAdapterPlay(objarraylist,this);