将按钮恢复到其位置

Question

我搜索了stackoverflow的答案买不能找到一个所以我发帖子问。帮助之手非常感谢。

我正在创建一个测验应用程序。该布局包含六个textview框和12个带字母的按钮。当用户点击按钮textview时，每个字母都会填充，并根据位置递增textview，以便所有六个textview框都被填充。文本填充textview后，按钮也会消失。我成功实现了这些步骤，但我的问题是如何将填充的textview文本设置为空，以便相应的按钮重新出现？更清楚我将onClickListener添加到textview但是textview中的填充文本不会减少。希望你能理解这个问题。我还在学习，正在从头开发应用程序。

switch(v.getId())

    {
     case R.id.button1:
{
    b1=(Button) findViewById(R.id.button1);

    String name1=b1.getText().toString();       

        tv.setText(name1);

    position++;
    b1.setVisibility(View.INVISIBLE);

}
    break;

    case R.id.button2:
        b2=(Button) findViewById(R.id.button2);

        String name2=b2.getText().toString();       

        //blankbut.setText(name2);
        tv.setText(name2);

        position++;

        b2.setVisibility(View.INVISIBLE);


    break;

    case R.id.button3:
        b3=(Button) findViewById(R.id.button3);

        String name3=b3.getText().toString();       

        tv.setText(name3);
        //blankbut.setText(name3);
        position++;

        b3.setVisibility(View.INVISIBLE);


    break;
    case R.id.button4:
        b4=(Button) findViewById(R.id.button4);

        String name4=b4.getText().toString();       

        tv.setText(name4);
        //blankbut.setText(name4);

        position++;

        b4.setVisibility(View.INVISIBLE);


    break;
    case R.id.button5:
        b5=(Button) findViewById(R.id.button5);

        String name5=b5.getText().toString();       

        tv.setText(name5);
        //blankbut.setText(name5);

        position++;

        b5.setVisibility(View.INVISIBLE);


    break;
    case R.id.button6:
        b6=(Button) findViewById(R.id.button6);

        String name6=b6.getText().toString();       

        tv.setText(name6);
        //blankbut.setText(name6);

        position++;

        b6.setVisibility(View.INVISIBLE);


    break;

    case R.id.button7:
        b7=(Button) findViewById(R.id.button7);

        String name7=b7.getText().toString();       

        tv.setText(name7);
    //  blankbut.setText(name7);

        position++;

        b7.setVisibility(View.INVISIBLE);


    break;

    case R.id.button8:
        b6=(Button) findViewById(R.id.button8);

        String name8=b8.getText().toString();       

        tv.setText(name8);
        //blankbut.setText(name8);

        position++;

        b8.setVisibility(View.INVISIBLE);


    break;

    case R.id.button9:
        b9=(Button) findViewById(R.id.button9);

        String name9=b9.getText().toString();       

        tv.setText(name9);
        //blankbut.setText(name9);

        position++;

        b9.setVisibility(View.INVISIBLE);


    break;

    case R.id.button10:
        b10=(Button) findViewById(R.id.button10);

        String name10=b10.getText().toString();     

        tv.setText(name10);
        //blankbut.setText(name10);

        position++;

        b10.setVisibility(View.INVISIBLE);


    break;

    case R.id.button11:
        b11=(Button) findViewById(R.id.button11);

        String name11=b11.getText().toString();     

        tv.setText(name11);
        //blankbut.setText(name11);

        position++;

        b11.setVisibility(View.INVISIBLE);


    break;

    case R.id.button12:
        b12=(Button) findViewById(R.id.button12);

        String name12=b12.getText().toString();     

        tv.setText(name12);
        //blankbut.setText(name12);

        position++;

        b12.setVisibility(View.INVISIBLE);

            break;
    }