错误：不兼容的类型：上下文无法转换为 ArrayList<datamodel></datamodel>

Question

I don't know what am I supposed to do, can somebody help me??

error: incompatible types: Context cannot be converted to ArrayList adapter = new myAdapter(getApplicationContext());

can you help me to solve my problem??

this is my MainActivity.java:

adapter = new myAdapter(getApplicationContext());
recycler.setAdapter(adapter);

here is myAdapter.java:

public class myAdapter extends RecyclerView.Adapter<myAdapter.myHolder> {
    ArrayList<dataModel> dataHolder;
    Context context;

    public myAdapter(ArrayList<dataModel> dataHolder) {
        this.dataHolder = dataHolder;
        //this.context = context;
    }
}

Answer 1

So, your getApplicationContext() method returns Context , but in your constructor you expect parameter of type ArrayList<dataModel> , that's why it throws exception. Now you have 2 options:

• keep your constructor, but pass different parameter

  adapter = new myAdapter(someArrayList);

• change constructor, so that it accepts Context

   public myAdapter(Context context) { this.dataHolder = new ArrayList<>(); this.context = context; }