java - 无法为 GridView 布局设置背景颜色

Question

我从未在 Android 上使用过 GridView。我尝试在 GridView 中扩展我的布局，并且我希望每个布局都有不同的背景。我无法为每个布局单独设置背景颜色，每次我为所有布局设置灰色。

我的 XML 代码:

<RelativeLayout
    android:layout_width="200dp"
    android:layout_height="150dp"
    android:id="@+id/back">


    <ImageView
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:id="@+id/imageView"
        android:layout_marginTop="10dp"
        android:src="@drawable/splashscreen"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Science"
        android:textSize="15sp"
        android:layout_marginTop="10dp"
        android:id="@+id/categoryTextView"
        android:layout_below="@+id/imageView"
        android:layout_centerHorizontal="true" />

</RelativeLayout>

网格适配器:

public class CellAdapter extends BaseAdapter {
private Context context;
private LinkedList<CellGrid> list;

public CellAdapter(Context context, LinkedList<CellGrid> list){
    this.context = context;
    this.list = list;
}


@Override
public int getCount() {
    return list.size();
}

@Override
public Object getItem(int position) {
    return list.get(position);
}

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

@Override
public View getView(int position, View convertView, ViewGroup parent) {

    if (convertView == null) {
        LayoutInflater inflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = (View) inflater.inflate(
                R.layout.grid_cell_layout, null);
    }

    convertView.setBackgroundColor(list.get(position).getBackground());
    TextView categoryTextView = (TextView)convertView.findViewById(R.id.categoryTextView);
    ImageView imageView = (ImageView)convertView.findViewById(R.id.imageView);
    categoryTextView.setText(list.get(position).getText());
    imageView.setImageResource(list.get(position).getImageId());
    RelativeLayout relativeLayout = (RelativeLayout) convertView.findViewById(R.id.back);
    Log.d("COLOR", Integer.toString(list.get(position).getBackground()));
    return convertView;
}

Answer 1

如果不满足任何特定颜色，则可以将随机背景设置为每个 View :

@Override
public View getView(int position, View convertView, ViewGroup parent) {

// generate the random integers for r, g and b value
    int r = rand.nextInt(255);
    int g = rand.nextInt(255);
    int b = rand.nextInt(255);

    int randomColor = Color.rgb(r,g,b);

    if (convertView == null) {
        LayoutInflater inflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = (View) inflater.inflate(
                R.layout.grid_cell_layout, null);

 convertView.setBackgroundColor(randomColor);
    }