当我尝试使用 recylerview 和 picaso 加载图像时，出现此错误“IllegalArgumentException:上下文不得为空。”
*我尝试使用recylerview来显示一堆图像，我已经完成了，然后我尝试使用picaso来加载图像负载。 *我也尝试使用“this”关键字，但这不起作用。
主要 Activity 。
public class MainActivity extends AppCompatActivity {
//Dummydata or place holderdata.
final static int[] dummyImages={R.drawable.color_black,R.drawable.color_white,R.drawable.color_brown,R.drawable.color_dusty_yellow,R.drawable.color_mustard_yellow,R.drawable.color_red};
private RecyclerView mRecyclerView;
private RecyclerView.Adapter mAdapter;
private RecyclerView.LayoutManager mLayoutManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mRecyclerView = (RecyclerView) findViewById(R.id.my_recycler_view);
// use a linear layout manager
mLayoutManager = new GridLayoutManager(getApplicationContext(),2);
mRecyclerView.setLayoutManager(mLayoutManager);
// specify an adapter (see also next example)
mAdapter = new RecycleAdapter(dummyImages);
mRecyclerView.setAdapter(mAdapter);
}
}
我的适配器
public class RecycleAdapter extends RecyclerView.Adapter<RecycleAdapter.ViewHolder> {
private String[] adumyDataSet;
private int[] adumyimage;
private Context context;
// Provide a direct reference to each of the views within a data item
// Used to cache the views within the item layout for fast access
public static class ViewHolder extends RecyclerView.ViewHolder {
// Your holder should contain a member variable
// for any view that will be set as you render a row
public ImageView colorImageView;
// We also create a constructor that accepts the entire item row.
// and does the view lookups to find each subview
public ViewHolder(View itemView) {
// Stores the itemView in a public final member variable that can be used
// to access the context from any ViewHolder instance.
super(itemView);
colorImageView = (ImageView) itemView.findViewById(R.id.colorsBitch);
}
}
public RecycleAdapter (int[] dummyDataSet){
adumyimage=dummyDataSet;
}
@Override
public RecycleAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_view,parent,false);
return new ViewHolder(v);
}
@Override
public void onBindViewHolder(RecycleAdapter.ViewHolder holder, int position) {
Picasso.with(context).load(adumyimage[position]).into(holder.colorImageView);
}
@Override
public int getItemCount()
{
return adumyimage.length;
}
}
最佳答案
使用这个: 将上下文作为构造函数发送到适配器
public RecycleAdapter (int[] dummyDataSet,Context context){
this.context=context;
adumyimage=dummyDataSet;
}
在您的 Activity 中
mAdapter = new RecycleAdapter(dummyImages,this);
关于java - 在 Recyclerview 中使用 picasso 时出现 IllegalArgumentException : Context must not be null.，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/39645723/