Android：向EditText条目添加验证

Question

我想在EditText的输入中添加验证，以便用户输入1-12之外的数字时，应用程序不会移动到下一个Activity，而是我想要它什么都不做，允许用户重新输入有效的号码。我不知道该怎么做。

当前代码EditText部分：

//Setting up next activity to open  via intent
Intent intent = new Intent(this, PracticeTest.class);
//Validation to ensure number is between 1 and 12
if (convertedNumber2 >= 1 && convertedNumber2 <= 12) {
    //pass int value
    intent.putExtra("convertedNumber2", convertedNumber2);

} else {

}
//open activity
startActivity(intent);

Answer 1

        //Validation to ensure number is between 1 and 12
        if (convertedNumber2 >= 1 && convertedNumber2 <= 12) {
             //Setting up next activity to open via intent
             Intent intent = new Intent(this, PracticeTest.class);

            //pass int value
            intent.putExtra("convertedNumber2", convertedNumber2);

            //open activity
            startActivity(intent);
        } else {
            Toast.makeText(this, "Opss, wrong value!", Toast.LENGTH_SHORT).show(); 
        }