我是一名新的android开发人员,不知道出了什么问题。请帮忙。
public class MainActivity extends Activity {
private EditText studentid, password;
private ImageView login, reset;
@Override
protected void onCreate(Bundle savedInstanceState) {
studentid = (EditText) findViewById(R.id.studentid);
password = (EditText) findViewById(R.id.password);
login = (ImageView) findViewById(R.id.login);
login.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
String un = studentid.getText().toString();
String pw = password.getText().toString();
String setun = "s123";
String setpw = "456";
if (un.equals(setun) && pw.equals(setpw)) {
loginsuccess();
} else {
studentid.setText("");
password.setText("");
Toast toast = Toast.makeText(v.getContext(),
"Wrong username or password...", Toast.LENGTH_LONG);
toast.show();
}
}
});
}
private void loginsuccess() {
Intent intent = new Intent(MainActivity.this, edit.class);
startActivity(intent);
}
}
它不能在模拟器中运行。
最佳答案
您缺少setContentView(R.layout.your_layout)
在studentid = (EditText) findViewById(R.id.studentid);
之前添加以上行
它应该看起来像这样
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.your_layout); // this line is missing
studentid = (EditText) findViewById(R.id.studentid);
关于android - 无法在模拟器中运行,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/25195819/