所以我在这里有这些代码,它运行时不会崩溃。但是,当我将“ this”传递给gridadapter时,mContext为null。我试图通过getApplicationContext(),但是仍然无法使getImage方法正常运行,因为Context为null,因此getResources.getIdentifier行不返回任何内容。如果有人可以教我这是怎么回事以及如何解决它,我对此表示赞赏。谢谢。

public class ChampionInfo extends FragmentActivity {

GridView gridtable;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_champion_info);

    gridtable = (GridView) findViewById(R.id.gridtable);
    gridtable.setAdapter(new GridAdapter(getApplicationContext()));

}

public class GridAdapter extends BaseAdapter {
    private Context mContext;

    String[] list = getResources().getStringArray(R.array.championlist);

    int[] champImage = getImage();

    public int[] getImage() {

        int[] tempImage = new int[list.length];

        for (int i = 0; i < list.length; i++) {
            tempImage[i] = getResources().getIdentifier(list[i],
                    "drawable", getPackageName());
        }

        return tempImage;

    }

    // Constructor
    public GridAdapter(Context c) {

        mContext = c;

    }

    public int getCount() {
        return champImage.length;
    }

    public Object getItem(int position) {
        return null;
    }

    public long getItemId(int position) {
        return 0;
    }

    // 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) {
            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(champImage[position]);
        return imageView;
    }

    // Keep all Images in array

}


}

最佳答案

问题的根源在于您尝试使用以下命令内联初始化成员变量

int[] champImage = getImage();


这在将mContext设置为有效值的构造函数之前执行。但是,在mContext调用中nullgetImage()的事实应该是无关紧要的,因为您实际上从未在该方法中使用mContext

总体问题是,您需要注意执行顺序。

10-04 13:53