onClickListener获取外部对象

Question

我在用户点击时更改了背景按钮。

但是我需要更改2个按钮的背景：当我点击btnSim时我需要更改btnSim背景和btnNao背景：

holder.btnNao.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View arg0) {

        ImageButton botao = (ImageButton) arg0;

        if (botao.getBackground().getConstantState()==getResources().getDrawable(R.drawable.rdb_off).getConstantState())
        {
            botao.setBackgroundResource(R.drawable.rdb_on);
        }
        else
            botao.setBackgroundResource(R.drawable.rdb_off);
    }

});


holder.btnSim.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View arg0) {

        ImageButton botaoSim = (ImageButton) arg0;

        if (botaoSim.getBackground().getConstantState()==getResources().getDrawable(R.drawable.rdb_off).getConstantState())
        {
            botaoSim.setBackgroundResource(R.drawable.rdb_on);
        }
        else
            botaoSim.setBackgroundResource(R.drawable.rdb_off);

    }

});

编辑我的更多代码：http://pastebin.com/Jf1ZDek5

Answer 1

请注意if {}。

中的更改

Button botao = (Button) findViewById(R.id.button_1);
Button botaoSim = (Button) findViewById(r.id.button_2);
holder.btnNao.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View arg0) {

                    ImageButton botao = (ImageButton) arg0;

                    if (botao.getBackground().getConstantState()==getResources().getDrawable(R.drawable.rdb_off).getConstantState())
                    {
                        botao.setBackgroundResource(R.drawable.rdb_on);
                        botaoSim.setBackgroundResource(R.drawable.rdb_on);

                    }
                    else
                      botao.setBackgroundResource(R.drawable.rdb_off);
                }

            });


            holder.btnSim.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View arg0) {

                    ImageButton botaoSim = (ImageButton) arg0;

                    if (botaoSim.getBackground().getConstantState()==getResources().getDrawable(R.drawable.rdb_off).getConstantState())
                    {
                        botao.setBackgroundResource(R.drawable.rdb_on);
                        botaoSim.setBackgroundResource(R.drawable.rdb_on);
                    }
                    else
                        botaoSim.setBackgroundResource(R.drawable.rdb_off);

                }

            });

新代码段

public class MainActivity extends Activity implements OnClickListener {


@Override
public void onClick(View v) {
    if (botaoSim.getBackground().getConstantState()==getResources().getDrawable(R.drawable.rdb_off).getConstantState())
                    {
                        botao.setBackgroundResource(R.drawable.rdb_on);
                        botaoSim.setBackgroundResource(R.drawable.rdb_on);
                    }
                    else
                        botaoSim.setBackgroundResource(R.drawable.rdb_off);
}


private class CustomAdapter extends BaseAdapter
{
  /** All your implementations as in pastebin */
  ...
  public View getView(int position, View convertView, ViewGroup parent) {
                    ViewHolder holder = null;
                    if (convertView == null) {
                            holder = new ViewHolder();
                            /* Add reference to holder.btnNao and holder.btnSim */
                            holder.btnNao.setOnClickListener(MainActivity.this);
                            holder.btnSim.setOnClickListener(MainActivity.this);
                            /* Your remaining code */
   }
}

请注意，我已将customAdapter设为MainActivity中的私有内部类。

Answer 2

您可以实现onClickListener，因为两个按钮的一部分执行相同的操作：

示例：

public class MainActivity extends Activity implements OnClickListener {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        botao.setOnClickListener(this);
        botaoSim.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        //put your code here.
    }
}