Question

我是Android的新手。你能教我如何在editText中分配一个变量吗？请参阅下面的示例代码。

EditText assignVariable = (EditText) findViewById(R.id.variable);

if(assignVariable == 12 ) {
    Toast.makeText(getApplicationContext(), "Assign Varialbe Successfull", Toast.LENGTH_SHORT);
    return true;
} else {
    Toast.makeText(getApplicationContext(), "Not Successfully Assign!", Toast.LENGTH_SHORT);
    return true;
}

Answer 1

如果要在edittext中设置文本，则可以使用：

assignVariable.setText("your text goes here");

如果您需要从edittext检索文本，则需要将此代码置于按钮单击上。（不仅仅是在EditText初始化之后。）

String assignedText = assignVariable.getText().toString();

并且您无法将String与==运算符进行比较。您应该使用equals或equalsIgnoreCase

if (assignedText.equals("12")) {
    Toast.makeText(getApplicationContext(), "Assign Varialbe Successfull",   Toast.LENGTH_SHORT);
    return true;
} else {
    Toast.makeText(getApplicationContext(), "Not Successfully Assign!", Toast.LENGTH_SHORT);
    return true;
}

希望这有帮助。

Answer 2

EditText assignVariable = (EditText) findViewById(R.id.variable);

if(assignVariable.getText().toString().equals("12") ) {
    Toast.makeText(getApplicationContext(), "Assign Varialbe Successfull", Toast.LENGTH_SHORT);
    return true;
} else {
    Toast.makeText(getApplicationContext(), "Not Successfully Assign!", Toast.LENGTH_SHORT);
    return true;
}

在EditText中分配变量

2 个答案: