这是我的 MainMenu.java 的一部分
public class MainMenu extends Activity{
Button userinfo,requestservice,makepayment,trackparcel,checkcard;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_menu);
// Show the Up button in the action bar.
setupActionBar();
userinfo = (Button) findViewById(R.id.userinfo);
requestservice = (Button) findViewById(R.id.requestservice);
makepayment = (Button) findViewById(R.id.makepayment);
trackparcel = (Button) findViewById(R.id.trackparcel);
checkcard = (Button) findViewById(R.id.checkcard);
userinfo.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent(MainMenu.this, UserInfo.class);
startActivity(intent);
}
});
requestservice.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent(MainMenu.this, RequestService.class);
startActivity(intent);
}
});
makepayment.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent(MainMenu.this, Payment.class);
startActivity(intent);
}
});
trackparcel.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent(MainMenu.this, TrackParcel.class);
startActivity(intent);
}
});
checkcard.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent(MainMenu.this, CheckCard.class);
startActivity(intent);
}
});
}
public void onBackPressed() {
new AlertDialog.Builder(MainMenu.this).setTitle("Logout")
.setMessage("Would you like to logout?")
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Intent intent = new Intent(MainMenu.this, Login.class);
SharedPreferences sp = PreferenceManager
.getDefaultSharedPreferences(MainMenu.this);
Editor edit = sp.edit();
edit.clear();
edit.commit();
startActivity(intent);
}
})
.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// user doesn't want to logout
}
})
.show();
}
这是我的 Login.java 的一部分
public class Login extends ActionBarActivity implements OnClickListener {
private Button login, register;
private EditText email, password;
JSONArray loginposition = null;
// Progress Dialog
private ProgressDialog pDialog;
// JSON parser class
JSONParser jsonParser = new JSONParser();
private static final String LOGIN_URL = "http://XXX.XXX.X.XX:1234/PMSS/login.php";
// JSON element ids from repsonse of php script:
private static final String TAG_SUCCESS = "success";
private static final String TAG_MESSAGE = "message";
private static final String TAG_POSTS = "posts";
private static final String TAG_EMAIL = "email";
private static final String TAG_POSITION = "position";
@SuppressLint("NewApi")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
login = (Button) findViewById(R.id.login);
register = (Button) findViewById(R.id.registerlauncher);
email = (EditText) findViewById(R.id.userid);
password = (EditText) findViewById(R.id.password);
login.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String Username = email.getText().toString();
String Password = password.getText().toString();
new AttemptLogin(Username, Password).execute();
}
});
register.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent(Login.this, Register.class);
startActivity(intent);
}
});
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
// For the main activity, make sure the app icon in the action bar
// does not behave as a button
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
}
public void onBackPressed() {
Intent intent = new Intent(this, SplashScreen.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
intent.putExtra("EXIT", true);
startActivity(intent);
finish();
}
我只是不知道为什么在 MainMenu.java 中选择"is"注销后，它会返回到我想要的登录页面，但是一旦我到达登录页面，我又按回车键它将返回主菜单而没有任何 logcat..
最佳答案
我认为您需要在MainMenu 的onBackPressed 方法中调用finish。这将从返回堆栈中删除 Activity 。
public void onBackPressed() {
new AlertDialog.Builder(MainMenu.this).setTitle("Logout")
.setMessage("Would you like to logout?")
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Intent intent = new Intent(MainMenu.this, Login.class);
SharedPreferences sp = PreferenceManager
.getDefaultSharedPreferences(MainMenu.this);
Editor edit = sp.edit();
edit.clear();
edit.commit();
startActivity(intent);
finish(); // Call finish here.
}
})
.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// user doesn't want to logout
}
})
.show();
}
关于android - 当我在登录页面上按下后退按钮时，它将转到主菜单(在我选择是后在 MainMenu Activity 中注销)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/20586925/