java - 在 Gridview 中更新图像时出现问题

Question

我正在 android 中构建一个简单的 floodit 游戏，并且正在努力使 gridview 或者更确切地说是“ImageAdapterGridView”在单击时更新图像。当用户点击一个单元格时，游戏会记录该单元格的颜色并使左上角的单元格颜色相同。问题是我无法重绘网格。我在网上找到的所有解决方案似乎都以与我不同的方式填充网格。

public class GameActivity extends AppCompatActivity {

public int clickedCell;

public String colour = "error";

public int[] numbers = new int[64];

public Context mContext;

public GridView androidGridView;

public Integer[] imageIDs = {
        R.drawable.blue, R.drawable.orange, R.drawable.pink, R.drawable.purple, R.drawable.red, R.drawable.yellow, R.drawable.blue, R.drawable.orange,
        R.drawable.blue, R.drawable.orange, R.drawable.pink, R.drawable.purple, R.drawable.red, R.drawable.yellow, R.drawable.blue, R.drawable.orange,
        R.drawable.blue, R.drawable.orange, R.drawable.pink, R.drawable.purple, R.drawable.red, R.drawable.yellow, R.drawable.blue, R.drawable.orange,
        R.drawable.blue, R.drawable.orange, R.drawable.pink, R.drawable.purple, R.drawable.red, R.drawable.yellow, R.drawable.blue, R.drawable.orange,
        R.drawable.blue, R.drawable.orange, R.drawable.pink, R.drawable.purple, R.drawable.red, R.drawable.yellow, R.drawable.blue, R.drawable.orange,
        R.drawable.blue, R.drawable.orange, R.drawable.pink, R.drawable.purple, R.drawable.red, R.drawable.yellow, R.drawable.blue, R.drawable.orange,
        R.drawable.blue, R.drawable.orange, R.drawable.pink, R.drawable.purple, R.drawable.red, R.drawable.yellow, R.drawable.blue, R.drawable.orange,
        R.drawable.blue, R.drawable.orange, R.drawable.pink, R.drawable.purple, R.drawable.red, R.drawable.yellow, R.drawable.blue, R.drawable.orange,
};

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_game);

    Random random= new Random();

    for(int i = 0; i < numbers.length; i++) {
        int number= random.nextInt(6);
        numbers[i]= number;
    }

    for(int i =0; i < numbers.length; i++)  {
        if(numbers[i]==0)   {
            imageIDs[i] = R.drawable.blue;
        }
        else if(numbers[i]==1)   {
            imageIDs[i] = R.drawable.orange;
        }
        else if(numbers[i]==2)   {
            imageIDs[i] = R.drawable.pink;
        }
        else if(numbers[i]==3)   {
            imageIDs[i] = R.drawable.purple;
        }
        else if(numbers[i]==4)   {
            imageIDs[i] = R.drawable.red;
        }
        else if(numbers[i]==5)   {
            imageIDs[i] = R.drawable.yellow;
        }
    }

    androidGridView = (GridView) findViewById(R.id.gridview_android_example);
    androidGridView.setAdapter(new ImageAdapterGridView(this));

    androidGridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        public void onItemClick(AdapterView<?> parent,
                                View v, int position, long id) {

            ImageAdapterGridView IAGV = new ImageAdapterGridView(mContext);

            clickedCell = position;
            if(numbers[clickedCell]==0) {
                imageIDs[0] = R.drawable.blue;
                colour = "blue";
                Toast.makeText(getBaseContext(), "Tile " + (position + 1) + " Selected.  It is " + colour, Toast.LENGTH_SHORT).show();
                IAGV.getView(0, null, parent);
            }
            else if(numbers[clickedCell]==1)    {
                imageIDs[0] = R.drawable.orange;
                colour = "orange";
                Toast.makeText(getBaseContext(), "Tile " + (position + 1) + " Selected.  It is " + colour, Toast.LENGTH_SHORT).show();
                IAGV.getView(0, null, parent);
            }
            else if(numbers[clickedCell]==2)    {
                imageIDs[0] = R.drawable.pink;
                colour = "pink";
                Toast.makeText(getBaseContext(), "Tile " + (position + 1) + " Selected.  It is " + colour, Toast.LENGTH_SHORT).show();
                IAGV.getView(0, null, parent);
            }
            else if(numbers[clickedCell]==3)    {
                imageIDs[0] = R.drawable.purple;
                colour = "purple";
                Toast.makeText(getBaseContext(), "Tile " + (position + 1) + " Selected.  It is " + colour, Toast.LENGTH_SHORT).show();
                IAGV.getView(0, null, parent);
            }
            else if(numbers[clickedCell]==4)    {
                imageIDs[0] = R.drawable.red;
                colour = "red";
                Toast.makeText(getBaseContext(), "Tile " + (position + 1) + " Selected.  It is " + colour, Toast.LENGTH_SHORT).show();
                IAGV.getView(0, null, parent);
            }
            else if(numbers[clickedCell]==5)    {
                imageIDs[0] = R.drawable.yellow;
                colour = "yellow";
                Toast.makeText(getBaseContext(), "Tile " + (position + 1) + " Selected.  It is " + colour, Toast.LENGTH_SHORT).show();
                IAGV.getView(0, null, parent);
            }
        }
    });
}

public class ImageAdapterGridView extends BaseAdapter {

    public ImageAdapterGridView(Context c) {
        mContext = c;
    }

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

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

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

    public View getView(int position, View convertView, ViewGroup parent) {
        ImageView mImageView;

        if (convertView == null) {
            mImageView = new ImageView(mContext);
            mImageView.setLayoutParams(new GridView.LayoutParams(130, 130));
            mImageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
            mImageView.setPadding(1, 4, 1, 4);
        } else {
            mImageView = (ImageView) convertView;
        }
        mImageView.setImageResource(imageIDs[position]);
        return mImageView;
    }
}

这是我的主课。目前我正在尝试重新调用 getView() 类，希望这会重新绘制图像，但我不知道这是否可能。如果需要任何其他信息，请告诉我。

非常感谢。

Answer 1

将适配器提取到变量中:

//// extract adapter into a variable instead of creating inline
// androidGridView.setAdapter(new ImageAdapterGridView(this));

ImageAdapterGridView adapter = new ImageAdapterGridView(this);
androidGridView.setAdapter(adapter);

然后您可以调用 .notifyDataSetChanged 来刷新您的 onclick 中的 View :

adapter.notifyDataSetChanged();

您可以在 onClick 方法的底部执行一次。

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您还在点击处理程序中创建了第二个适配器:

ImageAdapterGridView IAGV = new ImageAdapterGridView(mContext);

这完全是在创建一个新的适配器，因此此时您将有两个适配器，但其中一个未附加到 View 。

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另一件小事是它的名字有点令人困惑，因为它是一个适配器，但命名时就好像它是一个 View 一样。我可能会将其命名为 ImageGridViewAdapter。