Question

我有一个问题，即在我的BaseAdapter中，我尝试仅针对在其中找到的特定字母来更改按钮的颜色，但是当我尝试这样做时，颜色会更改系统中的所有按钮，我该怎么办？干嘛？

更具体地说，在MainActivity类中，有两个列表： userAnswer和newList。在onCreate（）中创建类时，我向userAnswer添加了某些字母A，B，C等。并且我想在选择buttonAddLetter之后向userAnswer添加下一个字母，只有我想使这些新字母将颜色更改为另一个字母，而不是与其他字母相同。一切正常，但是问题是所有字母都更改为不同的颜色，尽管在BaseAdapter中，我检查数据是否来自newList，如果是，则更改颜色。我究竟做错了什么？为什么所有按钮的颜色都会改变？

感谢您的帮助。

GridViewAnswerAdapter.class

public class GridViewAnswerAdapter extends BaseAdapter {

    private List<String> answer;
private Context context;
private MainActivity mainActivity;

public GridViewAnswerAdapter(List<String> answer, Context context, MainActivity mainActivity) {
    this.answer = answer;
    this.context = context;
    this.mainActivity = mainActivity;
}

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

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

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

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

    Button buttonAnswerAdapter = null;

    if (convertView == null) {
        if (answer.get(position).equals(" ")) {

            buttonAnswerAdapter = new Button(context);
            buttonAnswerAdapter.setLayoutParams(new GridView.LayoutParams(100, 100));
            buttonAnswerAdapter.setPadding(8, 8, 8, 8);
            buttonAnswerAdapter.setBackgroundColor(Color.BLUE);

        }

//I want to change color button only where newList add some new letter, //everything is ok, but it's change every button colors, why?

        else if(mainActivity.newList.size() != 0){

            if (mainActivity.newList.get(position).equals(answer.get(position))) {

                buttonAnswerAdapter = new Button(context);
                buttonAnswerAdapter.setLayoutParams(new GridView.LayoutParams(100, 100));
                buttonAnswerAdapter.setPadding(8, 8, 8, 8);
                buttonAnswerAdapter.setBackgroundColor(Color.BLACK);

                buttonAnswerAdapter.setTextColor(Color.RED);


                buttonAnswerAdapter.setText(String.valueOf(mainActivity.newList.get(position)));
            }
        }

        else if(mainActivity.userAnswer.get(position).equals(answer.get(position))) {

            //Create new button
            buttonAnswerAdapter = new Button(context);
            buttonAnswerAdapter.setLayoutParams(new GridView.LayoutParams(100, 100));
            buttonAnswerAdapter.setPadding(8, 8, 8, 8);
            buttonAnswerAdapter.setBackgroundColor(Color.BLUE);


            buttonAnswerAdapter.setTextColor(Color.GREEN);


            buttonAnswerAdapter.setText(String.valueOf(answer.get(position)));

        }
        else
        {
            Toast.makeText(context, "Something is wrong!", Toast.LENGTH_SHORT).show();
        }

    }
        else {
            buttonAnswerAdapter = (Button) convertView;
        }

    return buttonAnswerAdapter;
}

}

MainActivity.class

public class MainActivity extends AppCompatActivity {


List<String> userAnswer = new ArrayList<>();
List<String> newList = new ArrayList<>();

GridViewAnswerAdapter gridViewAnswerAdapter;
GridView gridViewAnswer;

Button buttonAddLetter;

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

    gridViewAnswer = findViewById(R.id.gridViewAnswer);
    buttonAddLetter = findViewById(R.id.buttonWskazówka);


    buttonAddLetter.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            addMore();
        }
    });


    userAnswer.add(0, "A");
    userAnswer.add(1, "B");
    userAnswer.add(2, "C");
    userAnswer.add(3, "D");
    userAnswer.add(4, "E");
    userAnswer.add(5, "F");
    userAnswer.add(6, "G");


    gridViewAnswerAdapter = new GridViewAnswerAdapter(userAnswer, getApplicationContext(), MainActivity.this);
    gridViewAnswer.setAdapter(gridViewAnswerAdapter);

    gridViewAnswerAdapter.notifyDataSetChanged();

}

private void addMore()
{

    newList.clear();

    newList.addAll(userAnswer);
    newList.set(0, "A");
    newList.set(1, "B");
    newList.set(2, "C");


    gridViewAnswerAdapter = new GridViewAnswerAdapter(userAnswer, getApplicationContext(), MainActivity.this);
    gridViewAnswer.setAdapter(gridViewAnswerAdapter);

    gridViewAnswerAdapter.notifyDataSetChanged();

}

}

我添加图片是因为我不知道如何完全解释我想要实现的目标：

在一张图片上，我有一个带有6个按钮的列表视图，在第二张图片上，我们只有一个不同的按钮列表（新的List，在索引上添加了0,1,2-A，B，C）颜色。问题是我想从第三张图片中获得效果，即当我按下袜子时，我希望新添加的字母具有完全不同的颜色，而那些字母已经具有原来的颜色。

enter image description here

Answer 1

更改您的Adapter构造函数，并将List“ newList”直接传递给Adapter。传递Activity并不是一个好主意，只是为了使您可以访问Activity中的某些类变量。

private List<String> answer;
private List<String> newList;
private Context context;

public GridViewAnswerAdapter(List<String> answer, List<String> newList, Context context) {
    this.answer = answer;
    this.newList = newList;
    this.context = context;
}

在您的MainActivity中使用它：

gridViewAnswerAdapter = new GridViewAnswerAdapter(userAnswer, newList, MainActivity.this);

将您的getView()的{{1}}方法更改为此：

Adapter

在您的@Override public View getView(final int position, View convertView, ViewGroup parent) { Button buttonAnswerAdapter = null; if (convertView == null) { buttonAnswerAdapter = new Button(context); buttonAnswerAdapter.setLayoutParams(new GridView.LayoutParams(100, 100)); buttonAnswerAdapter.setPadding(8, 8, 8, 8); buttonAnswerAdapter.setBackgroundColor(Color.BLUE); buttonAnswerAdapter.setTextColor(Color.GREEN); buttonAnswerAdapter.setText(answer.get(position)); }else{ buttonAnswerAdapter = (Button) convertView; } if(newList.size() != 0){ if (newList.get(position).equals(answer.get(position))) { buttonAnswerAdapter.setBackgroundColor(Color.BLACK); buttonAnswerAdapter.setTextColor(Color.RED); } } return buttonAnswerAdapter; }方法中，不需要这样做：

addMore()

因为已经设置了gridViewAnswerAdapter = new GridViewAnswerAdapter(userAnswer, getApplicationContext(), MainActivity.this); gridViewAnswer.setAdapter(gridViewAnswerAdapter);并且已经添加了“ newList”。

我通常将自己的自定义xml布局用于Adapter中的View。但是，如果仅创建inflate对您有用。.为什么不呢？

Answer 2

我很难理解您想要的结果。如果要在初始化后更改按钮颜色，请存储对按钮适配器或按钮的引用。这样，您可以在运行时访问它并将其更改为所需的任何内容。

如何更改BaseAdapter中仅一个特定按钮的颜色？

2 个答案: