Tried everything like cleaning the project,installing SDK build tools,checking for errors in XML layout files. Still no way I can get rid of this "unexpected R error".
Below is the code for First.java
package com.example.wctm;
import android.os.Bundle;
import android.app.Activity;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class First extends Activity implements OnClickListener {
EditText name;
EditText pass;
Button submit;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_first);
name=(EditText)findViewById(R.id.editText1);
pass=(EditText)findViewById(R.id.editText2);
submit=(Button)findViewById(R.id.button1);
submit.setOnClickListener((android.view.View.OnClickListener) this);
}
public void onClick(View v)
{
String na=name.getText().toString();
String pa=pass.getText().toString();
switch (v.getId()) {
case R.id.button1:
if(na.equals("wctm") && (pa.equals("wctm")))
{
Intent i=new Intent(this,Second.class);
startActivity(i);
}
break;
default:
break;
}
}
enter code here
#Override
public void onClick(DialogInterface arg0, int arg1) {
}
}
Related
I am doing a saving system with sharedPreferences, the problem is that when I run the application it seems that if the String is saved but when converting it to int later it returns null values or 0...
the edit text only receives numbers, and what I try is to obtain its value as a string and then convert it to int, since I want to use that value in another activity
package com.example.ml_prototipe_a;
import androidx.appcompat.app.AppCompatActivity;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import org.w3c.dom.Text;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
public class MainActivity extends AppCompatActivity {
private EditText inputLimiter;
private TextView mostrarLimite;
public String limiterStr;
public int limiterInt;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mostrarLimite = (TextView)findViewById(R.id.MostrarAciertos);
inputLimiter = (EditText) findViewById(R.id.InLimAciertos);
limiterStr = inputLimiter.getText().toString().trim();
Button btnRecNotas = findViewById(R.id.recNotasBtn);
Button btnGuardarLim = findViewById(R.id.GuardarLimite);
btnRecNotas.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intRecNotas = new Intent(MainActivity.this, MainRecNotas.class);
startActivityForResult(intRecNotas, 0);
}
});
btnGuardarLim.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
}
});
}
public void Cargar(View view){
SharedPreferences limitPrefs= getBaseContext().getSharedPreferences("limitData", Context.MODE_PRIVATE);
String recovaStr = limitPrefs.getString("numbreLimiter", "");
if(!"".equals(recovaStr)) {
limiterInt = Integer.parseInt(recovaStr);
mostrarLimite.setText("aciertos: " + limiterInt);
System.out.println(limiterInt);
}
}
public void Guardar(View view){
if(mostrarLimite!=null) {
SharedPreferences limitPrefs = getBaseContext().getSharedPreferences("limitData", Context.MODE_PRIVATE);
SharedPreferences.Editor editer = limitPrefs.edit();
editer.putString("numberLimiter", limiterStr);
editer.apply();
}
}
}
NEW CODE!!!!********************************
package com.example.ml_prototipe_a;
import androidx.appcompat.app.AppCompatActivity;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import org.w3c.dom.Text;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
public class MainActivity extends AppCompatActivity {
private EditText inputLimiter;
private TextView mostrarLimite;
public String limiterStr;
public int limiterInt;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mostrarLimite = (TextView) findViewById(R.id.MostrarAciertos);
inputLimiter = (EditText) findViewById(R.id.InLimAciertos);
Button btnRecNotas = findViewById(R.id.recNotasBtn);
Button btnGuardarLim = findViewById(R.id.GuardarLimite);
Button btnCargarLimTEMP = findViewById(R.id.cargarTemp);
btnRecNotas.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intRecNotas = new Intent(MainActivity.this, MainRecNotas.class);
startActivityForResult(intRecNotas, 0);
}
});
btnGuardarLim.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Guardar();
}
});
btnCargarLimTEMP.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Cargar();
}
});
}
private void Cargar() {
SharedPreferences limitPrefs = getBaseContext().getSharedPreferences("limitData", Context.MODE_PRIVATE);
String recovaStr = limitPrefs.getString("numbreLimiter", "");
try {
limiterInt = Integer.parseInt(recovaStr);
} catch (NumberFormatException nfe) {
System.out.println("Could not parse " + nfe);
}
mostrarLimite.setText("aciertos: " + limiterInt);
System.out.println(limiterInt);
Toast.makeText(this, "Limite de aciertos: " + limiterInt, Toast.LENGTH_SHORT).show();
}
private void Guardar() {
if (mostrarLimite != null) {
SharedPreferences limitPrefs = getBaseContext().getSharedPreferences("limitData", Context.MODE_PRIVATE);
SharedPreferences.Editor editer = limitPrefs.edit();
editer.putString("numberLimiter", limiterStr);
editer.apply();
limiterStr = inputLimiter.getText().toString().trim();
Toast.makeText(this, "Limite de aciertos actualizado: " + limiterStr, Toast.LENGTH_SHORT).show();
System.out.println(limiterStr);
}
}
}
I am beginner. I have made a simple log in form in android studio. I face a fault in if condition. Please solve this.
If username box is empty then control should go in if(...) but it goes to else part and open next intent
code is here:
package com.android.dumbseraaz;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
private EditText uname;
private EditText pwd;
private Button login;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
uname = (EditText)findViewById(R.id.txt_userName);
pwd = (EditText)findViewById(R.id.txt_Password);
login = (Button)findViewById(R.id.button);
login.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
validate(uname.getText().toString(),pwd.getText().toString());
}
});
}
private void validate(String myuname, String Pswd) {
if(myuname == "")
{
uname.setText("user");
}
else if(Pswd == "")
{
pwd.setText("PasswordMe");
}
else {
Intent intent = new Intent(MainActivity.this, app_home.class);
startActivity(intent);
}
}
}
I have the code for the sound and the next activity. I do not know how to merge the two codes in order to execute them at the same time or in sequence.
package com.example.testmessages;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageButton;
public class MainActivity extends AppCompatActivity {
ImageButton imageButton;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Add sound
final MediaPlayer gunSoundMP = MediaPlayer.create(this, R.raw.gunsound);
ImageButton GunSound=(ImageButton)this.findViewById(R.id.imageButton3);
GunSound.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
gunSoundMP.start();
}
});
//Image button to execute new Activity
imageButton=(ImageButton) findViewById(R.id.imageButton3);
imageButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intentLoadMain2Activity = new Intent(MainActivity.this, Main2Activity.class);
startActivity(intentLoadMain2Activity);
gunSoundMP.start();
}
});
}
}
as posts are limited in size on this platform I will post in parts first my mainactivity.java file package com.cancunsteve.aboutcancunsteve;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.MainActivity;
import android.NewActivity2;
public class MainActivity extends AppCompatActivity {
Button button;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button = (Button) findViewById(R.id.MyButton);
button.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
Intent myIntent = new Intent(MainActivity.this,
NewActivity2.class);
startActivity(myIntent);
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
You have to create a NewActivity2 class/activity
Your import is wrong for the NewActivity2, I doubt it is part of the android package.
I have 2 screen on first i have Text field and when i pressed the button it takes me to second screen with data from the Text Field but while pressing the back button from screen 2 to screen 1.
I want that the text field(screen 1) will show the previously added data through variables.
////////////////////////////////////Screen 1 code://///////////////////////////
package com.example.abids.savingdataonbackbutton;
import android.content.Intent;
import android.os.PersistableBundle;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
Button button;
EditText name;
#Override
protected void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button=(Button)findViewById(R.id.buttonNext1);
name=(EditText)findViewById(R.id.editTextName);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
String namevalue= name.getText().toString();
savedInstanceState.putString("MyString", "Welcome back to Android");
Intent intent=new Intent(MainActivity.this,Main3Activity.class);
intent.putExtra("Name",namevalue);
startActivity(intent);
}
});
}
}
////////////////**Screen 2 code:**////////////////////////////////////////////
package com.example.abids.savingdataonbackbutton;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import org.w3c.dom.Text;
public class Main3Activity extends AppCompatActivity {
TextView t1;
Button b1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main3);
b1=(Button) findViewById(R.id.button);
t1=(TextView)findViewById(R.id.textView2);
t1=(TextView)findViewById(R.id.textView2);
getIntent().getStringExtra("Name");
t1.setText("Name :" +getIntent().getStringExtra("Name"));
b1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent= new Intent(Main3Activity.this,MainActivity.class);
startActivity(intent);
}
});
}
}
Screen 2
package com.example.abids.savingdataonbackbutton;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import org.w3c.dom.Text;
public class Main3Activity extends AppCompatActivity {
TextView t1;
Button b1;
String valueOfName;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main3);
b1=(Button) findViewById(R.id.button);
t1=(TextView)findViewById(R.id.textView2);
t1=(TextView)findViewById(R.id.textView2);
getIntent().getStringExtra("Name");
valueOfName = getIntent().getStringExtra("Name");
t1.setText("Name :" +getIntent().getStringExtra("Name"));
b1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
screen2Done();
}
});
}
public void screen2Done() {
Intent intent=new Intent();
intent.putExtra("RESULT_STRING", valueOfName);
setResult(RESULT_OK, intent);
finish();
}
#Override
public void onBackPressed() {
screen2Done();
}
On screen 1, capture the value in onActivityResult() method, similarly as in screen 2.