Question

当我想在列表视图中设置不同的背景按钮时，我遇到了问题。

public class ColorAdapter extends BaseAdapter{
private LayoutInflater inflater;
private Activity activity;
private String[] colors;

public ColorAdapter(Activity activity, String[] colors){
    this.activity=activity;
    this.colors=colors;
}


@Override
public View getView(int position, View convertView, ViewGroup parent) {
    if(inflater==null){
        inflater=(LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }
    if(convertView ==null){
        convertView=inflater.inflate(R.layout.color_layout,null);
    }

    Button button= (Button) convertView.findViewById(R.id.button);
    String thisColor = colors[position].toString();
    button.setText(thisColor);
    String attributeValue = button.getText().toString().toLowerCase();


    if(thisColor == "black"){
         button.setBackgroundColor(Color.BLACK);
    }
    return convertView;
}

}

它没有改变颜色。但是这段代码： String thisColor = colors[position].toString(); button.setText(thisColor); 将文本设置为＆＃34;黑色＆＃34;。我错过了什么？

谢谢。

Answer 1

我已经更新了我的答案。

for String你需要使用string.equals（“string_value”）;

示例：

if(thisColor.equals("black")){
  //your code.
}

Answer 2

试试此代码

   public class ColorAdapter extends BaseAdapter{
    private LayoutInflater inflater;
    private Activity activity;
    private int[] colors={Color.BLACK,Color.YELLOW,Color.RED,Color.GREEN};//pass this arrary through constructor

    public ColorAdapter(Activity activity){
        this.activity=activity;

    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        if(inflater==null){
            inflater=(LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        }
        if(convertView ==null){
            convertView=inflater.inflate(R.layout.color_layout,null);
        }

        Button button= (Button) convertView.findViewById(R.id.button);
        int thisColor = colors[position];
        button.setText(thisColor);
        String attributeValue = button.getText().toString().toLowerCase();
        button.setBackgroundColor(thisColor);
        return convertView;
    }
}

Android Studio在列表视图中动态按钮背景

2 个答案: