在TextView中显示乘法表

Question

我正在尝试生成一个乘法表，其中第一个EditText取实际数字，而第二个EditText取乘法表的实际范围。 当我运行项目时，结果只有数字*范围。任何人都可以在下面提到的循环或代码中帮助我，或者在GridLayout或TableLayout显示表而不是TextView任何替代方法。

protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_multiplication_table);
    number = (EditText)findViewById(R.id.numberTable);
    range = (EditText)findViewById(R.id.numberRange);
    click = (Button)findViewById(R.id.click);
    result = (TextView)findViewById(R.id.display);
    final String x = range.getText().toString();
    click.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View view) {
          int   a = Integer.parseInt(number.getText().toString());
          int   b = Integer.parseInt(range.getText().toString());



             for(int i = 1 ; i <= 10; i++)
            {
                for(int j = 1 ; j <= 10; j++)
                {
                    int res = a * b;
                            result. setText(a +" * " + b + " = " + res);

                }





            }
            return;
        }
    });

}
}

Answer 1

您正在为每一行调用setText() ，但是setText()会重置TextView的文本，您可能想使用append()代替

result.setText("");
int a = Integer.parseInt(number.getText().toString());
int b = Integer.parseInt(range.getText().toString());

for(int i = 1 ; i <= b; i++){       
    int res = a * i;
    result.append(a +" * " + i + " = " + res + "\n");       
}

或者使用StringBuilder

int a = Integer.parseInt(number.getText().toString());
int b = Integer.parseInt(range.getText().toString());
StringBuilder builder = new StringBuilder();

for(int i = 1 ; i <= b; i++){       
    int res = a * i;
    builder.append(a +" * " + i + " = " + res + "\n");      
}

result.setText(builder.toString())