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Not able to resolve identify member class attribute in android studio

package com.example.android.sunshine;
import android.content.Intent;
import android.content.SharedPreferences;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.view.MenuItemCompat;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.ShareActionProvider;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class DetailActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_detail);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new DetailFragment())
.commit();
}
}
#Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
// Inflate the menu; this adds items to the action bar if it is present.
inflater.inflate(R.menu.detailfragment, menu);
MenuItem menuItem=menu.findItem(R.id.action_share);
ShareActionProvider mShareActionProvider= (ShareActionProvider) MenuItemCompat.getActionProvider(menuItem);
if(mShareActionProvider!=null)
{
mShareActionProvider.setShareIntent(createShareForecastIntent());
}
else
{
Log.d(LOG_TAG,"Amen");
}
//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();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
startActivity(new Intent(this,SettingsActivity.class));
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class DetailFragment extends Fragment {
private static final String LOG_TAG = DetailFragment.class.getSimpleName();
private static final String FORECAST_SHARE_HASHTAG = " #SunshineApp";
private String mForecastStr;
public DetailFragment() {
setHasOptionsMenu(true);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
Intent intent = getActivity().getIntent();
View rootView = inflater.inflate(R.layout.fragment_detail, container, false);
if (intent != null && intent.hasExtra(Intent.EXTRA_TEXT)) {
mForecastStr = intent.getStringExtra(Intent.EXTRA_TEXT);
((TextView) rootView.findViewById(R.id.detail_text)).setText(mForecastStr);
}
return rootView;
}
private Intent createShareForecastIntent() {
Intent shareIntent = new Intent(Intent.ACTION_SEND);
shareIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
shareIntent.setType("text/plain");
shareIntent.putExtra(Intent.EXTRA_TEXT, mForecastStr + FORECAST_SHARE_HASHTAG);
return shareIntent;
}
}
}
In the code above when the line in the onCreateOptionsMenu where I use LOG_TAG and where I use createShareForecastIntent says cannot resolve symbol and method. I tried googling it but couldn't find anything. I am new to android and java both.

You need to define LOG_TAG in your DetailActivity first as such:
private static final String LOG_TAG = "Some tag string";

Declare createShareForecastIntent as static since FORECAST_SHARE_HASHTAG is static. if you want to use them inside a non-static class method, you can either declare it public and call it like this: DetailFragment.FORECAST_SHARE_HASHTAG, or simply declare the method that's using it without class reference as static.
i.e.:
public static final String FORECAST_SHARE_HASHTAG = " #SunshineApp";
// call it like this, referencing the class name
shareIntent.putExtra(Intent.EXTRA_TEXT, mForecastStr + DetailFragment.FORECAST_SHARE_HASHTAG);

Android Java code to set redirect to new activity after login?

Hi I have an android app created which is a basic login screen which I want to take you to a new activity screen if logged in correctly. However I am having trouble with the redirect. Here is my code:
package com.example.loginscreen;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity {
private EditText username=null;
private EditText password=null;
private TextView attempts;
private Button login;
int counter = 3;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
username = (EditText)findViewById(R.id.editText1);
password = (EditText)findViewById(R.id.editText2);
attempts = (TextView)findViewById(R.id.textView5);
attempts.setText(Integer.toString(counter));
login = (Button)findViewById(R.id.button1);
}
public void login(View view){
if(username.getText().toString().equals("mara") &&
password.getText().toString().equals("mara")){
Toast.makeText(getApplicationContext(), "Login Successful!",
Toast.LENGTH_LONG).show();
startActivity(new Intent(MainActivity.this,HomePage.class));
}
else{
Toast.makeText(getApplicationContext(), "Wrong Credentials",
Toast.LENGTH_SHORT).show();
attempts.setBackgroundColor(Color.RED);
counter--;
attempts.setText(Integer.toString(counter));
if(counter==0){
login.setEnabled(false);
}
}
}
#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;
}
}
At the moment if you login with the wrong credentials everything works as it should but if you login correctly the app just exits and says that it has stopped working. I know the problem it with my startActivity intent because if I remove
startActivity(new Intent(MainActivity.this,HomePage.class));
it at least puts up the toast to notify you that you have logged in correctly. Thanks!
Here is the code for the HomePage:
package com.example.loginscreen;
import android.widget.ImageView;
public class HomePage extends MainActivity{
ImageView image;
public void addListenerOnButton() {
image = (ImageView) findViewById(R.id.imageView1);
}
}

Firstly,
register HomePage activity in manifest.
And
change
public class HomePage extends MainActivity{
}
to
public class HomePage extends Activity{
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
}
}
Hope this helps.

How do I use setResult when returning from an activity?

I need help, I am making a simple application, and I don´t know how to return to the MainActivity the string from the spinner and the name of the person when i click in the "Aceptar" button.
MainActivity.java
package com.example.holaamigos;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.EditText;
import android.widget.Toast;
public class MainActivity extends Activity {
public final static String EXTRA_SALUDO = "com.example.holaamigos.SALUDO";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final EditText txtNombre = (EditText)findViewById(R.id.TxtNombre);
final Button btnHola = (Button)findViewById(R.id.BtnHola);
final CheckBox checkbox1 =(CheckBox)findViewById(R.id.checkBox1);
checkbox1.setOnCheckedChangeListener(new OnCheckedChangeListener(){
#Override
public void onCheckedChanged(CompoundButton arg0,
boolean checked) {
if (checked)
{
Toast.makeText(checkbox1.getContext(), "Activo", Toast.LENGTH_LONG).show();
btnHola.setVisibility(0);
btnHola.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this, ActivitySaludo.class);
String saludo = txtNombre.getText().toString();
intent.putExtra(EXTRA_SALUDO, saludo);
startActivity(intent);
}
});
}
else
{
Toast.makeText(checkbox1.getContext(), "Inactivo", Toast.LENGTH_SHORT).show();
btnHola.setVisibility(View.INVISIBLE);
}
}
});
}
public void HobbyReturn(int requestcode, int resultadocode, Intent data) {
if (resultadocode == ActivitySaludo.ACEPTAR_OK); {
String string = data.getStringExtra(ActivitySaludo.ACEPTAR_OK);
}
}
#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;
}
}
ActivitySaludo
package com.example.holaamigos;
import com.example.holaamigos.R.string;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;
import android.widget.TextView;
public class ActivitySaludo extends Activity {
public static final String ACEPTAR_OK = "com.example.holaamigos.ACEPTAR_OK";
String myspinner;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_saludo);
Intent intent = getIntent();
String saludo = intent.getStringExtra(MainActivity.EXTRA_SALUDO);
TextView txtCambiado = (TextView) findViewById(R.id.TxtSaludo);
txtCambiado.setText(getString(R.string.hola_saludo) + " " + saludo);
final Spinner spinner = (Spinner)findViewById(R.id.SpinnerSaludo);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.hobby, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_item);
spinner.setAdapter(adapter);
spinner.setOnItemSelectedListener(new OnItemSelectedListener () {
#Override
public void onItemSelected(AdapterView<?> parent, View view,
int pos, long id) {
parent.getItemAtPosition(pos);
myspinner = spinner.getItemAtPosition(pos).toString();
}
#Override
public void onNothingSelected(AdapterView<?> arg0) {
//another call
}
});
final Button BtnAceptar=(Button) findViewById(R.id.buttonAceptar);
BtnAceptar.setOnClickListener(new OnClickListener (){
#Override
public void onClick(View v) {
Intent iboton = new Intent();
iboton.putExtra("HOBBY", myspinner);
setResult(ACEPTAR_OK, iboton);
finish();
}
});
}
}

You need to start your second activity with the flag that you are waiting for a result, so instead of startActivity you need to make use of startActivityForResult.
If you need a little bit more information take a look at this tutorial it should cover all you need to get things working.

android development View.OnClickListener error

I'm starting learning android development but im facing a an error which says :
Multiple markers at this line
- view cannot be resolved to a type
- The method setOnClickListener(View.OnClickListener) in the type View is not applicable
for the arguments (new
OnClickListener(){})
my program is :
package com.sc.uploader;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends Activity {
int counter;
Button add;
Button sub;
TextView disply;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
counter = 0;
add =(Button) findViewById(R.id.badd);
sub=(Button) findViewById(R.id.bsub);
disply= (TextView) findViewById(R.id.tvdisplay);
add.setOnClickListener(new view.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
}
});
}
#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;
}
}
so please if you could help me resolving the error i will be grateful
thanks

Change this line
add.setOnClickListener(new view.OnClickListener() {
to
add.setOnClickListener(new View.OnClickListener() {
capital "V". It is looking for a variable view when it should be set on the View Class.
OnClickListener Docs

GetExtra PutExtra

Ok So i want to pass values from One activity to another using getextrand putextra method.
In Second Activity in which I want to receive data is full of contents like Buttons and Text view. and i want to set that certain value which i have received from MainActivity to a particular text box.
setContenView(R.id.intent)
is the easiest one method to show a string but what if I want to Set this value to one or more textview. My code is here
MainActivity
package com.prashant.cookbook;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends Activity {
static String Message_send="Prashant";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
EditText et=(EditText)findViewById(R.id.editText1);
Button send=(Button)findViewById(R.id.send);
final Intent msg_send= new Intent(this,Second.class);
String MSG= et.getText().toString();
msg_send.putExtra(Message_send, MSG);
send.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
startActivity(msg_send);
}
});
}
#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;
}
}
SecondAvtivity
package com.prashant.cookbook;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.widget.TextView;
public class Second extends Activity {
private TextView tv;
private Intent rcv;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
tv = (TextView) findViewById(R.id.msg_show);
rcv = getIntent();
String Show_msg;
Show_msg=rcv.getStringExtra(MainActivity.Message_send);
tv.setText(Show_msg);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.second, menu);
return true;
}
}
but when I run this code I got nothing but a blank second Activity Not even a default text

get Value entered by user in EditText on Button click and then use msg_send.putExtra for placing value in Intent as:
send.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
String MSG= et.getText().toString(); //<< get value from EditText here
msg_send.putExtra(Message_send, MSG);
startActivity(msg_send);
}
});