无法调用适配器类中的构造函数

问题描述

我正在使用 Android image slider 一个用于图像滑块的github库。

我从库文档中复制了代码，但是仍然无法将数据传递到适配器类中。

MainActivity

public class MainActivity extends AppCompatActivity {

    private List<ModelSlider> mSlider;
    private SliderView sliderView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mSlider = new ArrayList<>();

        sliderView = findViewById(R.id.imageSlider);

        SliderAdapter adapter = new SliderAdapter(this);

        sliderView.setSliderAdapter(adapter);

        sliderView.setIndicatorAnimation(IndicatorAnimationType.WORM); //set indicator animation by using IndicatorAnimationType. :WORM or THIN_WORM or COLOR or DROP or FILL or NONE or SCALE or SCALE_DOWN or SLIDE and SWAP!!
        sliderView.setSliderTransformAnimation(SliderAnimations.SIMPLETRANSFORMATION);
        sliderView.setAutoCycleDirection(SliderView.AUTO_CYCLE_DIRECTION_BACK_AND_FORTH);
        sliderView.setIndicatorSelectedColor(Color.WHITE);
        sliderView.setIndicatorUnselectedColor(Color.GRAY);
        sliderView.setScrollTimeInSec(4); //set scroll delay in seconds :
        sliderView.startAutoCycle();

        getSliderImage(1);
    }

    private void getSliderImage(int id)
    {
        Call<ResponseSliderImage> call = apiclient.getInstance().getApi().getSliderImage(id);
        call.enqueue(new Callback<ResponseSliderImage>() {
            @Override
            public void onResponse(Call<ResponseSliderImage> call,Response<ResponseSliderImage> response) {
                if (response.isSuccessful())
                {
                    ResponseSliderImage responseSliderImage = response.body();
                    Toast.makeText(MainActivity.this,responseSliderImage.getMessage(),Toast.LENGTH_SHORT).show();
                    mSlider = responseSliderImage.getSliders();
                }
                else
                {
                    Toast.makeText(MainActivity.this,"Server Not Responding",Toast.LENGTH_SHORT).show();
                }
            }

            @Override
            public void onFailure(Call<ResponseSliderImage> call,Throwable t) {
                Toast.makeText(MainActivity.this,t.getMessage(),Toast.LENGTH_SHORT).show();
            }
        });
    }
}

我的适配器类

package com.socialcodia.msfazmi;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.Toast;

import com.smarteist.autoimageslider.SliderViewAdapter;
import com.socialcodia.omiggo.ModelSlider;
import com.squareup.picasso.Picasso;

import java.util.ArrayList;
import java.util.List;

public class SliderAdapter extends
        SliderViewAdapter<SliderAdapter.SliderAdapterVH> {

    private Context context;
    private List<ModelSlider> mSlider = new ArrayList<>();

    public SliderAdapter(Context context) {
        this.context = context;
    }

    public void renewItems(List<ModelSlider> sliderItems) {
        this.mSlider = sliderItems;
        notifyDataSetChanged();
    }

    public void deleteItem(int position) {
        this.mSlider.remove(position);
        notifyDataSetChanged();
    }

    public void addItem(ModelSlider sliderItem) {
        this.mSlider.add(sliderItem);
        notifyDataSetChanged();
    }

    @Override
    public SliderAdapterVH onCreateViewHolder(ViewGroup parent) {
        View inflate = LayoutInflater.from(parent.getContext()).inflate(R.layout.image_slider_layout_item,null);
        return new SliderAdapterVH(inflate);
    }

    @Override
    public void onBindViewHolder(SliderAdapterVH viewHolder,final int position) {

        ModelSlider modelSlider = mSlider.get(position);

        Picasso.get().load(modelSlider.getimageUrl()).into(viewHolder.sliderImage);

        viewHolder.itemView.setonClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(context,"This is item in position " + position,Toast.LENGTH_SHORT).show();
            }
        });
    }

    @Override
    public int getCount() {
        //slider view count Could be dynamic size
        return mSlider.size();
    }

    class SliderAdapterVH extends SliderViewAdapter.ViewHolder {

        View itemView;
        ImageView sliderImage;

        public SliderAdapterVH(View itemView) {
            super(itemView);
            sliderImage = itemView.findViewById(R.id.sliderImage);
            this.itemView = itemView;
        }
    }

}

在适配器类中，有一个构造函数addItem（）接受 ModelList 作为参数， 那么如何从主活动中调用此构造函数？

解决方法

将这段代码从onCreate方法移至getSliderImage(int id)方法中。

SliderAdapter adapter = new SliderAdapter(this);
sliderView.setSliderAdapter(adapter);

然后添加。

adapter.addItem(mSlider);

完整代码。

private void getSliderImage(int id)
{
    Call<ResponseSliderImage> call = ApiClient.getInstance().getApi().getSliderImage(id);
    call.enqueue(new Callback<ResponseSliderImage>() {
        @Override
        public void onResponse(Call<ResponseSliderImage> call,Response<ResponseSliderImage> response) {
            if (response.isSuccessful())
            {
                ResponseSliderImage responseSliderImage = response.body();
                Toast.makeText(MainActivity.this,responseSliderImage.getMessage(),Toast.LENGTH_SHORT).show();
                mSlider = responseSliderImage.getSliders();

                SliderAdapter adapter = new SliderAdapter(this);
                adapter.addItem(mSlider);
                sliderView.setSliderAdapter(adapter);
            }
            else
            {
                Toast.makeText(MainActivity.this,"Server Not Responding",Toast.LENGTH_SHORT).show();
            }
        }

        @Override
        public void onFailure(Call<ResponseSliderImage> call,Throwable t) {
            Toast.makeText(MainActivity.this,t.getMessage(),Toast.LENGTH_SHORT).show();
        }
    });
}