Android Hello GridView Tutorial Will Not Display Images

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心在旅途
心在旅途 2021-02-13 12:25

First time poster!

I am new to Android development and have been following Google\'s HelloView tutorials without problems... until the HelloGridView tutorial. For some r

4条回答
  •  囚心锁ツ
    2021-02-13 12:53

    replace your adapter class by given code

    package com.marnbeast.android; 
    
    import android.content.Context;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.BaseAdapter;
    import android.widget.GridView;
    import android.widget.ImageView;
    
    public class ImageAdapter extends BaseAdapter {
        private Context mContext;
    
        public ImageAdapter(Context c) {
            mContext = c;
        }
    
        public int getCount() {
            return mThumbIds.length;
        }
    
        public Object getItem(int position) {
            return mThumbIds[position];
        }
    
        public long getItemId(int position) {
            return position;
        }
    
        // create a new ImageView for each item referenced by the Adapter
        public View getView(int position, View convertView, ViewGroup parent) {
            ImageView imageView;
            if (convertView == null) {  // if it's not recycled, initialize some attributes
                imageView = new ImageView(mContext);
                imageView.setLayoutParams(new GridView.LayoutParams(85, 85));
                imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
                imageView.setPadding(8, 8, 8, 8);
            } else {
                imageView = (ImageView) convertView;
            }
    
            imageView.setImageResource(mThumbIds[position]);
            return imageView;
        }
    
        // references to our images
        private Integer[] mThumbIds = {
                R.drawable.sample_2, R.drawable.sample_3,
                R.drawable.sample_4, R.drawable.sample_5,
                R.drawable.sample_6, R.drawable.sample_7,
                R.drawable.sample_0, R.drawable.sample_1,
                R.drawable.sample_2, R.drawable.sample_3,
                R.drawable.sample_4, R.drawable.sample_5,
                R.drawable.sample_6, R.drawable.sample_7,
                R.drawable.sample_0, R.drawable.sample_1,
                R.drawable.sample_2, R.drawable.sample_3,
                R.drawable.sample_4, R.drawable.sample_5,
                R.drawable.sample_6, R.drawable.sample_7
        };
    }
    

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