Question

我在我的应用程序中使用Edittexts。但无法在运行时设置背景颜色。如果我做错了，请建议。

我已经采取了三个edittexts，它们应该根据do while循环中使用的编码来改变颜色。请检查并做出响应ASAp。提前谢谢。

这是我的代码。

public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);



            List<Map<String,String>> list = new ArrayList<Map<String,String >>();
            EditText ed1 = (EditText) findViewById(R.id.name);
            EditText ed2 = (EditText) findViewById(R.id.age);
            EditText ed3 = (EditText) findViewById(R.id.date);
            Map<String,String> map = new HashMap<String, String>();

            int i = 2;
            EmpDatabase empClick = new EmpDatabase(getApplicationContext());
            Cursor cursor = empClick.getDetails();
            if(cursor.moveToFirst()){
                do{
                    i= i+1;
                    if(i % 2 == 0)
                    {
                        // here is something wrong
                        ed1.setBackgroundColor(Color.BLUE);
                        ed2.setBackgroundColor(Color.BLUE);
                        ed3.setBackgroundColor(Color.BLUE);

                    }
                    else 
                    {
                        // here is something wrong
                        ed1.setBackgroundColor(Color.CYAN);
                        ed2.setBackgroundColor(Color.CYAN);
                        ed3.setBackgroundColor(Color.CYAN);
                    }
                    map = new HashMap<String, String>();
                    String name = cursor.getString(cursor.getColumnIndex("name"));
                    String age = cursor.getString(cursor.getColumnIndex("age"));
                    String time = cursor.getString(cursor.getColumnIndex("time"));
                    map.put("name",name);
                    map.put("age",age);
                    map.put("time", time);
                    list.add(map);

                }while(cursor.moveToNext());
                cursor.close();
            }


            SimpleAdapter adapter = new SimpleAdapter(this, list, R.layout.text_view, new String [] {"name", "age", "time"}, new int[] {R.id.name,R.id.age, R.id.date});
            setListAdapter(adapter);

    }

Answer 1

你对setContentView（YOUR_LAYOUT）的调用在哪里，基本上没有这个你的布局甚至没有生成，所以findViewById（R.id.name）将不会产生任何结果。

Answer 2

我得到了这个问题的答案。我做了一个适配器类，它扩展了简单的适配器..并编写以下代码..

public class EmpCustomAdapter extends SimpleAdapter{

    private int[] colors = new int[] { 0x30FF0000, 0x300000FF };

    public EmpCustomAdapter(Context context, List<Map<String, String>> list, int resource, String[] from, int[] to) {
        super(context, list, resource, from, to);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View view = super.getView(position, convertView, parent);
        int colorPos = position % colors.length;
        view.setBackgroundColor(colors[colorPos]);
        return view;
    }
}

并创建其对象并设置适配器..

EmpCustomAdapter adapter = new EmpCustomAdapter(this, list, R.layout.text_view, new String [] {"name", "age", "time"}, new int[] {R.id.name,R.id.age, R.id.date});
            setListAdapter(adapter);

它工作.. :) 感谢所有帮助我摆脱这个问题的人.. :)因信誉问题无法上传结果图片。:(

无法动态更改EditText背景颜色的颜色

2 个答案: