Edit: I am new to Android, I don't want to use databases or etc to store the credentials, I just want to make the if statement to work...
So, I am trying to make a simple login system for an app. After I
press login, the toast returns the false message, but the strings are true, what I am doing wrong when I am trying to verify those? (if statement)
package com.example.reevo.a02activities07;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import org.w3c.dom.Text;
import static android.R.attr.button;
import static android.R.attr.onClick;
import static android.icu.lang.UCharacter.GraphemeClusterBreak.T;
public class MainActivity extends AppCompatActivity {
TextView textViewUsername, textViewPassword;
Button loginButton;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textViewPassword = (TextView) findViewById(R.id.userInput);
textViewUsername = (TextView) findViewById(R.id.passwordInput);
loginButton = (Button) findViewById(R.id.buttonLogin);
}
public void onClick(View view){
if (textViewUsername.getText().toString().equals("admin") && textViewPassword.getText().toString().equals("pass")){
Toast.makeText(getApplicationContext(), "Succesfull!", Toast.LENGTH_SHORT).show();
} else Toast.makeText(getApplicationContext(), "Wrong credentials!", Toast.LENGTH_SHORT).show();
}
}
The textViewPassword is pointing to R.id.userInput and textViewUsername to R.id.passwordInput. You should change it
there is mistake in your binding controll check it
use this
textViewPassword = (TextView) findViewById(R.id.passwordInput);
textViewUsername = (TextView) findViewById(R.id.userInput);
insted of this
textViewPassword = (TextView) findViewById(R.id.userInput);
textViewUsername = (TextView) findViewById(R.id.passwordInput);
Related
I have code in which it has an editText box and a button. I want to save the text entered in the textbox and recall it the next time the app is opened.
import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class MainActivity extends Activity {
EditText txtLink;
Button btnOpenLink;
String defaultLink;
String secondLink;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
defaultLink = "http://";
secondLink = ".whatver.com";
txtLink = (EditText) findViewById(R.id.editText);
btnOpenLink = (Button) findViewById(R.id.button);
btnOpenLink.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
String server = txtLink.getText().toString();
if(!TextUtils.isEmpty(server)){
Intent intent=new Intent(MainActivity.this,webactivity.class);
intent.setData(Uri.parse(defaultLink+server+secondLink));
startActivity(intent);
}else{
Toast.makeText(MainActivity.this, "Please enter your server name.", Toast.LENGTH_LONG).show();
}
}
});
}
}
How can this be accomplished? I have tried numerous things that I have found through google but none have seemed to work right, I know it is something that I am doing most likely, I just can not make it work right.
Use the preferences....
Example
SharedPreferences spref = getSharedPreferences("your_prefs_name", Activity.MODE_PRIVATE);
SharedPreferences.Editor editor = spref.edit();
editor.putString("myTextViewValue", prefVal); //
editor.commit();
and somewhen latter when the app starts again read it back:
Example:
SharedPreferences preferences = getPreferences(Activity.MODE_PRIVATE);
String storedPreference = preferences.getStr("myTextViewValue", null);
so validate what you store and check if the preference you get is null, that means nothing was stored before...
I'm trying to make an help Dialog which provides some helpful tips to the users of my app. The tips should be in an #string resource to handle language issues. The dialog should pop up on click and the text in it should be scrollable. My current implementation fails to meet such requirements. Here is the code:
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;
import android.text.InputType;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import ch.OptiLab.visuscontroll.R;
public class MainActivity extends Activity implements OnClickListener {
TextView textView;
Button buttonende;
Button tipps;
Button btn1;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textView = (TextView) findViewById(R.id.textView);
tipps = (Button) findViewById(R.id.tipps);
btn1 = (Button) findViewById(R.id.buttonSTART);
buttonende = (Button) findViewById(R.id.buttonende);
btn1.setOnClickListener(this);
tipps.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v) {
// 1. Instantiate an AlertDialog.Builder with its constructor
AlertDialog.Builder builder = new AlertDialog.Builder (MainActivity.this.getActivity());
// 2. Chain together various setter methods to set the dialog characteristics
builder.setMessage(R.string.dialog_message)
.setTitle(R.string.dialog_title);
// 3. Get the AlertDialog from create()
AlertDialog dialog = builder.create();
}
});
Change your code to
(...)
AlertDialog dialog = builder.create();
dialog.show(); //Do not forget this line
Also, make sure to correctly initialize builder:
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
I am calling an intent that sets the 'To' field no problem of a GMail template from a String array, but I cannot get it to set the 'subject' and 'text' fields.
Hopefully someone can see where I'm going wrong
Here's my code:
package com.example.flybase2;
import android.app.Activity;
import android.app.Dialog;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class ContactsEmail extends Activity implements OnClickListener{
String emailPassed;
String emailAdd;
String emailSub;
String emailMess;
EditText setEmailAddress;
EditText setEmailSubject;
EditText setEmailMessage;
Button btnSendEmail;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.emaillayout);
Bundle extras = getIntent().getExtras();
if (extras != null) {
emailPassed = extras.getString("passedEmailAdd");
}
setEmailAddress = (EditText) findViewById (R.id.inputEmailAddress);
setEmailAddress.setText(emailPassed);
setEmailSubject = (EditText) findViewById (R.id.inputEmailSubject);
setEmailMessage = (EditText) findViewById (R.id.inputEmailMessage);
emailAdd = setEmailAddress.getText().toString();
emailSub = setEmailSubject.getText().toString();
emailMess = setEmailMessage.getText().toString();
btnSendEmail = (Button)findViewById(R.id.btnSendEmail);
btnSendEmail.setOnClickListener(this);
}
#Override
public void onClick(View sendEmailClick) {
Intent sendEmailIntent = new Intent(Intent.ACTION_SEND);
sendEmailIntent.setType("plain/text");
sendEmailIntent.putExtra(Intent.EXTRA_EMAIL,new String[] {emailAdd});
sendEmailIntent.putExtra(Intent.EXTRA_SUBJECT, emailSub);
sendEmailIntent.putExtra(Intent.EXTRA_TEXT, emailMess);
startActivity(Intent.createChooser(sendEmailIntent, "Send mail..."));
}
}
Try this.
Actually When activity create you get the value of these editext. At that time value of these all are empty. so you need to write these in onclick method.
When you click on button then you will get the current edit text value.
I hope this will solve your problem.
#Override
public void onClick(View sendEmailClick) {
emailAdd = setEmailAddress.getText().toString();
emailSub = setEmailSubject.getText().toString();
emailMess = setEmailMessage.getText().toString();
Intent sendEmailIntent = new Intent(Intent.ACTION_SEND);
sendEmailIntent.setType("plain/text");
sendEmailIntent.putExtra(Intent.EXTRA_EMAIL,new String[] {emailAdd});
sendEmailIntent.putExtra(Intent.EXTRA_SUBJECT, emailSub);
sendEmailIntent.putExtra(Intent.EXTRA_TEXT, emailMess);
startActivity(Intent.createChooser(sendEmailIntent, "Send mail..."));
}
and remove these three lines from onCreate() method.
emailAdd = setEmailAddress.getText().toString();
emailSub = setEmailSubject.getText().toString();
emailMess = setEmailMessage.getText().toString();
I am new in the android programming. I see many ways to do the event handling, but when I try to do it by calling the handler class it give error on handling class name:
package com.example.test;
import android.app.Activity;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//attach an instance of HandleClick to the Button
findViewById(R.id.button1).setOnClickListener(new HandleClick());
}
private class HandleClick implements OnClickListener{
public void onClick(View arg0) {
Button btn = (Button)arg0; //cast view to a button
// get a reference to the TextView
TextView tv = (TextView) findViewById(R.id.textview1);
// update the TextView text
tv.setText("You pressed " + btn.getText());
}
}
}
"HandleClick" error come on this it say class should be abstract type?
I do not understand why it is giving this error can any one help me?
That's the wrong OnClickListener class. You have
import android.content.DialogInterface.OnClickListener;
You need:
import android.view.View.OnClickListener;
For future reference, the error you get is "The type must implement the inherited abstract method...". This is because you need to implement the DialogInterface's onClick, which should have led you to notice that it was the wrong import (since you have onClick(View))
you imported the wrong OnClickListener, you should import the one from android.view.View
Make it simple & use this,
b1 = (Button) findViewById(R.id.button1);
TextView tv = (TextView) findViewById(R.id.textview1);
b1.setOnClickListener(new OnClickListener()
{
public void onClick(View v)
{
Toast msg = Toast.makeText(getBaseContext(),
"You have clicked Button 1", Toast.LENGTH_LONG);
msg.show();
tv.setText("You pressed " + btn.getText());
}
});
ok if you didnt see my previous question I asked how 2 Command button to import text to textview from edittext using Scanner? Here is what I have done:
I keep geting this error
"Syntax error on token
"setOnClickListener",
VariableDeclaratorId expected after
this token"
what am I missing or doing wrong?
package test.app;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.view.View.OnClickListener;
import java.util.Scanner;
import android.R.layout;
public class test extends Activity {
Scanner what = (new Scanner(System.in));
private int addbtn;
Button btn = (Button) findViewById(addbtn);
btn.setOnClickListener = (new OnClickListener() {
public void onClick(View v) {
int txtbox;
EditText txt = (EditText) findViewById(txtbox);
int tv1;
TextView txt1 = (TextView) findViewById(tv1);
txt.setText( txt.getText().toString() );}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
}
You're missing a closing brace } on the new OnClickListener block.
Also you shouldn't be attempting Button btn = (Button) findViewById(addbtn); before the onCreate(...) method has called setContentView(...).
On top of that, addbtn isn't a valid resource id.
Use findViewById() method before setContentView(...).
On top of which your closing brackets look messed up. What's matching the ( before the new onClickListener?