java - 简单的 Android 密码检查器不起作用

Question

我正在创建一个 Android 应用程序，将打开的第一个 Activity 是密码输入。要知道密码已经设置在值为“admit”的变量中。我创建了一个 if 语句来检查用户输入的值，然后将其与变量进行比较，如果值匹配，则转到主屏幕，但它一直说这是错误的密码。任何人都可以看一下我的代码并建议我是否出错了。

public class Password extends ActionBarActivity implements View.OnClickListener {
    protected String password = "admin";
    String getPassword;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_password);
        Button passwordButton = (Button) findViewById(passwordbutton);
        EditText passwordInput = (EditText) findViewById(R.id.password);
        getPassword = (passwordInput.getText().toString());
        passwordButton.setOnClickListener(this);

    }

    public void onClick(View v) {

        if (getPassword.equals(password)) {
            Intent goHome;
            goHome = new Intent(this, home.class);
            startActivity(goHome);
        } else {
             AlertDialog.Builder wrongPasswordBuilder = new AlertDialog.Builder(this);
            wrongPasswordBuilder.setTitle(getString(R.string.wrongPasswordTitle));
            wrongPasswordBuilder.setMessage(getString(R.string.wrongPasswordTryAgain));
            wrongPasswordBuilder.setPositiveButton("ok", null);
            AlertDialog dialog = wrongPasswordBuilder.show();
        }
    }

Answer 1

如果你在onCreate()中编写passwordInput.getText().toString()，它总是返回空字符串。因此，请在 onClick() 中写入这些行。代码写在下面

public void onClick(View v) {
getPassword = passwordInput.getText().toString()
if (getPassword.equals(password)) {
    Intent goHome;
    goHome = new Intent(this, home.class);
    startActivity(goHome);
} else {
     AlertDialog.Builder wrongPasswordBuilder = new AlertDialog.Builder(this);
    wrongPasswordBuilder.setTitle(getString(R.string.wrongPasswordTitle));
    wrongPasswordBuilder.setMessage(getString(R.string.wrongPasswordTryAgain));
    wrongPasswordBuilder.setPositiveButton("ok", null);
    AlertDialog dialog = wrongPasswordBuilder.show();
       }
}