Android 当我尝试创建此代码onClick（）时，为什么我的应用程序会关闭？
我试着比较两个值两个EditText中的一个，但要创建按钮并运行项目，它出错并关闭应用程序：Android 当我尝试创建此代码onClick（）时，为什么我的应用程序会关闭？,android,onclick,Android,Onclick,我试着比较两个值两个EditText中的一个，但要创建按钮并运行项目，它出错并关闭应用程序： public class MainActivity extends ActionBarActivity implements OnClickListener { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);
public class MainActivity extends ActionBarActivity implements OnClickListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
Button button = (Button) findViewById(R.id.button1);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
final EditText username = (EditText) findViewById(R.id.editText1);
final EditText password = (EditText) findViewById(R.id.editText2);
if (username.getText().toString() == "admin"
&& password.getText().toString() == "admin") {
Context context = getApplicationContext();
CharSequence text = "Logado com sucesso!";
int duration = Toast.LENGTH_SHORT;
Toast toast = Toast.makeText(context, text, duration);
toast.show();
} else {
Context context = getApplicationContext();
CharSequence text = "Erro! Dados inválidos";
int duration = Toast.LENGTH_SHORT;
Toast toast = Toast.makeText(context, text, duration);
toast.show();
}
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container,
false);
return rootView;
}
}
//
// @Override
// public void onClick(DialogInterface dialog, int which) {
// // TODO Auto-generated method stub
//
// final EditText username = (EditText) findViewById(R.id.editText1);
// final EditText password = (EditText) findViewById(R.id.editText2);
//
// if (username.getText().toString() == "admin"
// && password.getText().toString() == "admin") {
//
// Context context = getApplicationContext();
// CharSequence text = "Logado com sucesso!";
// int duration = Toast.LENGTH_SHORT;
//
// Toast toast = Toast.makeText(context, text, duration);
// toast.show();
//
// } else {
// Toast.makeText(
// this,
// "Your username or password is not correct! Please, insert again",
// Toast.LENGTH_SHORT).show();
//
// }
//
// }
@Override
public void onClick(DialogInterface arg0, int arg1) {
// TODO Auto-generated method stub
}
}
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:background="#1c5a6d"
tools:context="com.isckosta.app.MainActivity$PlaceholderFragment" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/editText1"
android:layout_alignParentTop="true"
android:layout_alignRight="@+id/editText1"
android:layout_marginTop="104dp"
android:gravity="left"
android:text="@string/usuario"
android:textSize="25sp"
android:textColor="#ffffff" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/editText1"
android:layout_below="@+id/editText1"
android:text="@string/senha"
android:textSize="25sp"
android:textColor="#ffffff"/>
<EditText
android:id="@+id/editText2"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView2"
android:layout_alignRight="@+id/editText1"
android:layout_below="@+id/textView2"
android:ems="10"
android:inputType="textPassword"
android:textSize="16sp"
android:hint="@string/digite_sua_senha_"
android:textColor="#ffffff" />
<Button
android:id="@+id/button1"
style="?android:attr/buttonStyleSmall"
android:layout_width="100dp"
android:layout_height="50dp"
android:layout_below="@+id/editText2"
android:layout_centerHorizontal="true"
android:text="@string/entrar"
android:textSize="20sp"
android:textColor="#ffffff" />
<Button
android:id="@+id/button2"
android:layout_width="200dp"
android:layout_height="50dp"
android:layout_below="@+id/button1"
android:layout_centerHorizontal="true"
android:layout_marginTop="32dp"
android:text="@string/criar_uma_conta"
android:textColor="#ffffff" />
<EditText
android:id="@+id/editText1"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:layout_below="@+id/textView1"
android:layout_centerHorizontal="true"
android:ems="8"
android:hint="@string/digite_seu_usuario"
android:textSize="16sp"
android:textColor="#ffffff" >
<requestFocus />
</EditText>
<TextView
android:id="@+id/welcome"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="34dp"
android:gravity="center_horizontal"
android:text="@string/welcome"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textSize="20sp"
android:textColor="#ffffff" />
</RelativeLayout>
我不知道还能做什么：（根据我的翻译和理解，您试图比较两个字符串，这就是您面临的问题。请尝试使用
username.getText（）.toString（）.equals（“admin”）和&password.getText（）.toString（）.equals（“admin”）