无法在Recyclerview中解析方法“clear（）”

Question

我试图用MOVIE db API获取的数据更新我的回收视图。我使用ASYNC任务来发出请求并从服务器获取结果，但是在onPostExecute（）中，当我尝试清除适配器并将新数据添加到适配器时，它显示“无法解析方法”clear（）' “

MAINACTIVITY

public class MainActivity extends AppCompatActivity { 

    final static QueryUtils queryUtils = new QueryUtils(); 
    final static String URL = "http://api.themoviedb.org/3/movie/popular? api_key="; 
    static String[] finalData = new  String[queryUtils.getLengthOfJsonArray(URL)]; 
    public RecyclerView mRecyclerView; 
    public 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.recylerView); 
     //using the grid layout manager 
     mLayoutManager = new GridLayoutManager(getApplicationContext(), 2); 
     mRecyclerView.setLayoutManager(mLayoutManager); 
     //setting the adpater. 
     mAdapter = new MovieAdapter(finalData, this); 
     mRecyclerView.setAdapter(mAdapter); 
     MovieTask task =new MovieTask(); 
     task.execute(URL);  
    } 

    private class MovieTask extends AsyncTask<String, Void, String[]> { 

     @Override 
     protected String[] doInBackground(String... params) { 
      String[] data = queryUtils.fetchMovieData(URL); 
      return data; 
     } 

     @Override 
     protected void onPostExecute(String[] data) { 
      mAdapter.clear(); 
     } 
    } 
} 

MOVIE-ADAPTER胡亚蓉

public class MovieAdapter extends RecyclerView.Adapter<MovieAdapter.ViewHolder>{ 

    private String[] adumyString; 
    private int[] adumyimage; 
    private Context context; 

    //Constructor for Movie Adapter 
    public MovieAdapter(String[] dummyDataSet,Context context) { 
     this.context=context; 
     adumyString=dummyDataSet; 
    } 

    // 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.movieImage); 
     } 
    } 
    /** 
    * Binds the data into 
    */ 
    @Override 
    public void onBindViewHolder(MovieAdapter.ViewHolder holder, int position) { 
     Picasso.with(context).load(adumyString[position]).into(holder.colorImageView); 
    } 

    @Override 
    public int getItemCount() { 
     return adumyString.length; 
    } 

    /** 
    * Inflates the out custom view on to the screen. 
    */ 
    @Override 
    public MovieAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
     View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.image_view,parent,false); 
     return new ViewHolder(v); 
    } 
} 

Answer 1

RecyclerView.Adapter抽象类不提供任何clear或add方法。请参阅here类的文档。

您必须在MovieAdapter类中声明并实现这些方法，并将mAdapter变量声明为MovieAdapter mAdapter;。

Answer 2

您可以在onPostExecute()方法中使用adapter.notifydatasetchanged()。

ps：对不起，在这里写评论，低代表:)