Question

我有5个EditText，当我单击按钮时，我想检查它们是否都为空，以便从中获取数据并将其放入数据库中，然后开始另一个活动。如果全部为空，将显示一条消息，“您需要填写所有内容”。但是，当所有EditTexts为空并且我按下按钮时，应用程序崩溃。我该如何解决这个问题，我该怎么做才能获得理想的结果？（代码尚未结束。）

public class Main2Activity extends AppCompatActivity {

DatabaseHelper myDB;
Button btnAdd;
EditText editText1,editText2,editText3,editText4,editText5;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main2);

    editText1 = (EditText) findViewById(R.id.name);
    editText2 = (EditText) findViewById(R.id.year);
    editText3 = (EditText) findViewById(R.id.month);
    editText4 = (EditText) findViewById(R.id.day);
    editText5 = (EditText) findViewById(R.id.price);



    btnAdd = (Button) findViewById(R.id.btn_add);
    myDB = new DatabaseHelper(this);




    btnAdd.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            String name1 = editText1.getText().toString();
            String year2 = editText2.getText().toString();
            int year1 = Integer.parseInt(year2);
            String month2 = editText3.getText().toString();
            int month1 = Integer.parseInt(month2);
            String day2 = editText4.getText().toString();
            int day1 = Integer.parseInt(day2);
            String price2 = editText5.getText().toString();
            int price1 = Integer.parseInt(price2);


            if (name1.length() != 0 && year2.length() != 0 && month2.length() != 0 && day2.length() != 0 && price2.length() != 0) {

                AddData(name1, year1, month1, day1, price1);

                editText1.setText("");
                editText2.setText("");
                editText3.setText("");
                editText4.setText("");
                editText5.setText("");

                Intent intent = new Intent(Main2Activity.this, MainActivity.class);
                startActivity(intent);

            } else {

                Toast.makeText(Main2Activity.this, "You need to fill everything", Toast.LENGTH_LONG).show();
            }


        }
    });
}




public void AddData(String name1, int year1, int month1, int day1, int price1) {

    boolean insertData = myDB.addData(name1,year1,month1,day1,price1);

    if(insertData==true){
        Toast.makeText(this, "Data Successfully Inserted!", Toast.LENGTH_LONG).show();
    }else{
        Toast.makeText(this, "Something went wrong :(.", Toast.LENGTH_LONG).show();
        }
    }
}

Answer 1

崩溃发生在这里：

int year1 = Integer.parseInt(year2);

当EditText为空时，您正在向Integer.parseInt传递一个空字符串，结果为NumberFormatException。为了避免这种情况，请将解析代码移到验证块中。

@Override
public void onClick(View v) {
    String name1 = editText1.getText().toString();
    String year2 = editText2.getText().toString();
    String month2 = editText3.getText().toString();
    String day2 = editText4.getText().toString();
    String price2 = editText5.getText().toString();

    if (name1.length() != 0 && year2.length() != 0 && month2.length() != 0 && day2.length() != 0 && price2.length() != 0) {

        // Move parsing code here
        int year1 = Integer.parseInt(year2);
        int month1 = Integer.parseInt(month2);
        int day1 = Integer.parseInt(day2);
        int price1 = Integer.parseInt(price2);
        AddData(name1, year1, month1, day1, price1);

        editText1.setText("");
        editText2.setText("");
        editText3.setText("");
        editText4.setText("");
        editText5.setText("");

        Intent intent = new Intent(Main2Activity.this, MainActivity.class);
        startActivity(intent);

    } else {

        Toast.makeText(Main2Activity.this, "You need to fill everything", Toast.LENGTH_LONG).show();
    }
}

Answer 2

仅在向所有您的editText输入文本后，您才允许用户按下按钮：

if (all editTexts got text inside) {
  //not all editTexts got text inside them, user cant press the button
  button.setClickable(false);  
}
else{
  //all editTexts got text inside them, user can now press the button
  button.setClickable(true);  
}

注意-我在if语句中写的“所有editTexts都包含文本”。

检查所有EditTexts是否为空的问题

2 个答案: