Question

我再次，iv尝试按照android复选框示例，虽然它已经工作了大部分，我需要代码只在单击按钮时启动，程序中只有一个按钮，此按钮也是曾经做过数学计算。我想我需要一个嵌套的if语句，但我只是想知道你们是否有人可以帮我构建这个，当检查checkBox时，我希望它检查文本字段旁边是否有数据复选框，如果有数据，我希望程序显示错误语句，虽然这只是在调用计算按钮后才能完成。任何人都可以给我任何帮助构建这个，我已经尝试添加监听器，但我已经有一个在calc按钮，如果我在此方法中添加更多，我收到错误消息：/ 有三个复选框，全部用于检查不同的字段，但是我也只想在任何时候检查一个复选框，并且只有在文本字段中没有适用于此的数据。欢呼的家伙，抱歉，如果我有点模糊，但我开始用我缺乏知识松开我的抹布。欢呼声

public class Current extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_current);
        // Show the Up button in the action bar.
        setupActionBar();

      Button calc1 = (Button)findViewById(R.id.current_calculate);

        calc1.setOnClickListener(new View.OnClickListener() {

              CheckBox checktime = (CheckBox) findViewById(R.id.custom1);
               CheckBox checkcurrent = (CheckBox) findViewById(R.id.custom2);
               CheckBox checkcharge = (CheckBox) findViewById(R.id.custom3);

               public void onClick(View v) {


                        //i would like this part to check that checktime is checked and that there is no data in editText Time1
                if (((CheckBox) v).isChecked()) {



                    Toast.makeText(Current.this,
                       "Bro, try Android :)", Toast.LENGTH_LONG).show();
                }





                        //i would like this part to check that checkCurrent is checked and that there is no data in editText current1
                if (((CheckBox) v).isChecked()) {
                    Toast.makeText(Current.this,
                       "Bro, i mean it ", Toast.LENGTH_LONG).show();
                }



                        //i would like this part to check that checkCharge is checked and that there is no data in editText charge1
                if (((CheckBox) v).isChecked()) {
                    Toast.makeText(Current.this,
                       "Bro, try Android :)", Toast.LENGTH_LONG).show();
                }


            // please note that i have not yet added the current.text field yet as i cannot be bothered with it throwing up errors just yet, please bear
           // in mind that i will be doing another two sums on this program, the next sum will be current1 / time1 and then the next will be charge1/current1
          // any help would be much appreciated, for now i only want the program to check that EditText current1 is empty and if so do the calculation bellow

                EditText Charge1 = (EditText)findViewById(R.id.number_input_2);    
                EditText Time1 = (EditText)findViewById(R.id.number_input_3);
                TextView Distances_answer = (TextView)findViewById(R.id.Distances_answer);
                double charge = Double.parseDouble(Charge1.getText().toString());
                double time = Double.parseDouble(Time1.getText().toString());
    //Time is a class in Java
                Distances_answer.setText("" +charge*time);

        }
    });
    }

Answer 1

 public void onClick(View v) {


                        //i would like this part to check that checktime is checked and that there is no data in editText Time1

if(Time1.length()==0){
               checktime.setChecked(true);


                    Toast.makeText(Current.this,
                       "Bro, try Android :)", Toast.LENGTH_LONG).show();
                }





                        //i would like this part to check that checkCurrent is checked and that there is no data in editText current1
              if(current1.length()==0){
               checkCurrent.setChecked(true);



                    Toast.makeText(Current.this,
                       "Bro, i mean it ", Toast.LENGTH_LONG).show();
                }



                        //i would like this part to check that checkCharge is checked and that there is no data in editText charge1
               if(charge1.length()==0){
               checkCharge.setChecked(true);



                    Toast.makeText(Current.this,
                       "Bro, tryAndroid ", Toast.LENGTH_LONG).show();
                }

            // please note that i have not yet added the current.text field yet as i cannot be bothered with it throwing up errors just yet, please bear
           // in mind that i will be doing another two sums on this program, the next sum will be current1 / time1 and then the next will be charge1/current1
          // any help would be much appreciated, for now i only want the program to check that EditText current1 is empty and if so do the calculation bellow

               // EditText Charge1 = (EditText)findViewById(R.id.number_input_2);    
             //   EditText Time1 = (EditText)findViewById(R.id.number_input_3);
               // TextView Distances_answer = (TextView)findViewById(R.id.Distances_answer);
                double charge = Double.parseDouble(Charge1.getText().toString());
                double time = Double.parseDouble(Time1.getText().toString());
    //Time is a class in Java
                Distances_answer.setText("" +charge*time);

        }
    });
Just make sure that you findviewbyid all the edit texts before the button click.

Answer 2

首先，因为它是onclicklistener的按钮，v在你的情况下总是按钮。所以((CheckBox) v).isChecked()会给出运行时错误。将其更改为checktime.isChecked()或您要检查其已检查状态的任何其他复选框。至于检查editext的空白，可以通过edittext.getText().toString().isEmpty()

来完成

使用复选框在单击按钮时检查数据

2 个答案: