小编Nam*_*ngh的帖子

我有这个主要活动.我在Login按钮上调用了validate方法.但是,当我点击按钮时,我没有收到错误消息,我的应用程序崩溃了.任何帮助,将不胜感激.谢谢.这是我的MainActivity Java类

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

public Button blogin;
public TextView signup;
public EditText uname, pass;

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

    uname = (EditText) findViewById(R.id.uname);
    pass = (EditText) findViewById(R.id.pass);
    signup = (TextView) findViewById(R.id.signup);
    blogin = (Button) findViewById(R.id.blogin);

    blogin.setOnClickListener(this);
    signup.setOnClickListener(this);


}

@Override
public void onClick(View v) {
    switch (v.getId()) {
        case R.id.blogin:


            validate();




            break;

        case R.id.signup:
            startActivity(new Intent(this, SignUp.class));
            break;
    }
}

@Override
protected void onPause() {
    super.onPause();
}

public boolean validate() {
    boolean …