My button code keeps giving me error in Android Studio - android

So I cant figure out how to get my button working I am having some problems in ANdroid Studio I am a very begginer so please be patient with me. Do you guys have any idea. I know I am doing something wrong but I cant figure out what it is.
thanks
package com.example.moemo.myapplication;
import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import java.util.concurrent.Future;
public class MainActivity extends AppCompatActivity {
private Button button4;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
button = (Button) findViewById(R.id.button4);
button.setOnClickListner(new View.OnClickListener() {
#Override
public void onClick(View v) {
openFutureEvents();
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
}
public void openFutureEvents() {
Intent intent = new Intent( this, FutureEvents.class )
startFutureEvents();
})
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.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();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
private void startFutureEvents() {
}


Since there are no error logs, somethings that I see wrong straight away:
You have your setContentView() inside your button onClickListener and alot of other code that shouldn't be inside onClickListener
Change your code as below:
public class MainActivity extends AppCompatActivity {
private Button button4;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button = (Button) findViewById(R.id.button4);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
button.setOnClickListner(new View.OnClickListener() {
#Override
public void onClick(View v) {
openFutureEvents();
});
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});


Copy the following code and run!
import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import java.util.concurrent.Future;
public class MainActivity extends AppCompatActivity {
private Button button4;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
button = (Button) findViewById(R.id.button4);
button.setOnClickListner(new View.OnClickListener() {
#Override
public void onClick(View v) {
startActivity(new Intent(FutureEvents.class);
}
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).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.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();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
What I have corrected is,
(1) removed unnecessary functions, openFutureEvents() & startFutureEvents().
(2) added startActivity() to call Activity.
Keep note that if you want to start an activity, you have to call startActivity(new Intent(YourActivity.class);


Try this one
public class MainActivity extends AppCompatActivity {
private Button button4;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
button4 = (Button) findViewById(R.id.button4);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
button4.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
openFutureEvents();
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.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();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public void openFutureEvents() {
Intent intent = new Intent(this, FutureEvents.class);
startActivity(intent);
}
private void startFutureEvents() {}
}


within your onCreate() method start by invoking
super.onCreate() method of the parent class
then setContentView(R.layout.activity_main); to inflate the layout
get reference to the view widgets (button,...)
button = (Button) findViewById(R.id.button);
then your event handlers... CHEERS


package com.example.moemo.myapplication;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends AppCompatActivity {
private Button button;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button = (Button) findViewById(R.id.button);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
button.setOnClickListner(new View.OnClickListener() {
#Override
public void onClick(View v) {
openFutureEvents();
});
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).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.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();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}

Related

Error Occurs in implementing the Navigation drawer

I have one Login Activity if user click on login button than automatically its go to Navigation Drawer but i got an error. Please Help me out from this error.
MainActivity.java
import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.NavigationView;
import android.support.v4.app.FragmentManager;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
import android.widget.AdapterView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener, AdapterView.OnItemSelectedListener, AdapterView.OnItemClickListener {
private Toolbar toolbar;
private DrawerLayout drawer;
public String emailRegistration;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_business);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
//toolbar.setTitle("toolbar");
setSupportActionBar(toolbar);
//Set adapter to AutoCompleteTextView
// FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
// if (!emailRegistration.matches("[a-zA-Z0-9._-]+#[a-z]+.[a-z]+")) {
//
// email.setError("Invalid Email Address");
//
// }
// fab.setOnClickListener(new View.OnClickListener() {
// #Override
// public void onClick(View v) {
// Snackbar.make(v, "Replace with your own action", Snackbar.LENGTH_LONG)
// .setAction("Action", null).show();
// }
// });
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.addDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
}
#Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
#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();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
#SuppressWarnings("StatementWithEmptyBody")
#Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_camera) {
setTitle("Home");
Intent i = new Intent(MainActivity.this, HomeFragment.class);
startActivity(i);
} else if (id == R.id.nav_gallery) {
setTitle("Edit Profile");
EditFragment editFragment = new EditFragment();
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.fragment,editFragment).commit();
} else if (id == R.id.nav_slideshow) {
setTitle("Business");
BusinessFragment businessFragment = new BusinessFragment();
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.fragment,businessFragment).commit();
} else if (id == R.id.nav_manage) {
setTitle("Message");
MessageFragment messageFragment = new MessageFragment();
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.fragment,messageFragment).commit();
} else if (id == R.id.nav_share) {
} else if (id == R.id.nav_send) {
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
#Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
// TODO Auto-generated method stub
//Log.d("AutocompleteContacts", "onItemSelected() position " + position);
}
#Override
public void onNothingSelected(AdapterView<?> adapterView) {
InputMethodManager imm = (InputMethodManager) getSystemService(
INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(getCurrentFocus().getWindowToken(), 0);
}
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
// TODO Auto-generated method stub
// Show Alert
Toast.makeText(getBaseContext(), "Position:"+i+" Country:"+adapterView.getItemAtPosition(i),
Toast.LENGTH_LONG).show();
Log.d("AutocompleteContacts", "Position:"+i+" Country:"+adapterView.getItemAtPosition(i));
}
}
LoginActivity.java
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class LoginActivity extends AppCompatActivity {
public EditText email, password;
public TextView textView;
public Button login;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.login);
email = (EditText) findViewById(R.id.email);
// if( email.getText().toString().length() == 0 )
// email.setError("Email is required!" );
password = (EditText) findViewById(R.id.text_input_password_toggle);
// if( password.getText().toString().length() == 0 )
// password.setError("Password is required!" );
textView = (TextView) findViewById(R.id.text2);
login = (Button) findViewById(R.id.login);
login.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(LoginActivity.this, MainActivity.class);
startActivity(intent);
}
});
textView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent i = new Intent(LoginActivity.this,signupactivity.class);
startActivity(i);
}
});
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:openDrawer="start">
<include
layout="#layout/app_bar_main"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<android.support.design.widget.NavigationView
android:id="#+id/nav_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
android:fitsSystemWindows="true"
app:headerLayout="#layout/nav_header_main"
app:menu="#menu/activity_main_drawer" />
</android.support.v4.widget.DrawerLayout>
Error
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v4.widget.DrawerLayout.addDrawerListener(android.support.v4.widget.DrawerLayout$DrawerListener)' on a null object reference
SignupActivity. java
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.Button;
import android.widget.EditText;
import java.util.ArrayList;
import java.util.List;
public class signupactivity extends AppCompatActivity {
public EditText firstname, lastname, email;
private AutoCompleteTextView actv;
public Button signup;
String[] languages={"Indore","Ujjain","Bhopal","Delhi","Bangalore","Chennai"};
List<CharSequence> list = new ArrayList<CharSequence>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.content_main);
for (int i=0;i<20;i++){
list.add("test " + i); // Add the item in the list
}
firstname = (EditText)findViewById(R.id.firstname);
lastname = (EditText)findViewById(R.id.lastname);
actv = (AutoCompleteTextView) findViewById(R.id.autoCompleteTextView1);
email = (EditText) findViewById(R.id.email);
signup = (Button)findViewById(R.id.signup);
ArrayAdapter adapter = new
ArrayAdapter(this,android.R.layout.simple_list_item_1,languages);
actv.setAdapter(adapter);
actv.setThreshold(1);
signup.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent i = new Intent(signupactivity.this, LoginActivity.class);
startActivity(i);
}
});
}
}
Image I want the blank fragment when i click on the home, edit profile but its show everywhere signup activity because my content_main framelayout id is fragment and its call in mainactivity and its my signup page too (fragmentManager.beginTransaction().replace(R.id.fragment,editFragment).commit();) So how to solve this problem

In your MainActivity.java you are using
setContentView(R.layout.fragment_business);
But your drawer is in activity_main.xml
So your drawer is a null and you cannot add a listener to a null object.
Change the setContentView to
setContentView(R.layout.activity_main);

No resource found for abc_test_vector.xml

I recently updated with Support Library 24.2.1 and I rebuild my App with it..
But the App crashed on Startup..
Logcat shows error like -
No resource found for abc_test_vector.xml
I've searched in AppCompat 24.2.1 & found the file in res/drawable/ then why this error?
Even the Sample App didn't work -
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).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.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();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}

Android Studio MainActivity.java:: error: ';' expected

I am new to Android development, When Android Studio in "MainActivity" class is compiled I get the following error
I have pasted the error log below:
:\Users\kanak\AndroidStudioProjects\SelfDistructText\app\src\main\java\com\example\kanak\selfdistructtext\MainActivity.java:61: error: ';' expected
public boolean onCreateOptionsMenu(Menu menu){
^
C:\Users\kanak\AndroidStudioProjects\SelfDistructText\app\src\main\java\com\example\kanak\selfdistructtext\MainActivity.java:61: error: ';' expected
public boolean onCreateOptionsMenu(Menu menu){
^
C:\Users\kanak\AndroidStudioProjects\SelfDistructText\app\src\main\java\com\example\kanak\selfdistructtext\MainActivity.java:69: error: ';' expected
public boolean onOptionsItemSelected (MenuItem item){
^
C:\Users\kanak\AndroidStudioProjects\SelfDistructText\app\src\main\java\com\example\kanak\selfdistructtext\MainActivity.java:69: error: ';' expected
public boolean onOptionsItemSelected (MenuItem item){
I have pasted my MainActivity Class code below:
enter code here
package com.example.kanak.selfdistructtext;
import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.app.ActionBar;
import android.util.Log;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import com.parse.Parse;
import com.parse.ParseAnalytics;
import com.parse.ParseObject;
import com.parse.ParseUser;
public class MainActivity extends AppCompatActivity{`enter code here`
public static final String TAG = MainActivity.class.getSimpleName();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
// Parase Analytice
ParseAnalytics.trackAppOpenedInBackground(getIntent());
ParseUser currentUser = ParseUser.getCurrentUser();
if (currentUser == null) {
Intent intent = new Intent(this, LoginActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
} else {
Log.i(TAG, currentUser.getUsername());
}
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).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.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();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
}

Replace your code with the following code:
public class MainActivity extends AppCompatActivity{
public static final String TAG = MainActivity.class.getSimpleName();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
// Parase Analytice
ParseAnalytics.trackAppOpenedInBackground(getIntent());
ParseUser currentUser = ParseUser.getCurrentUser();
if (currentUser == null) {
Intent intent = new Intent(this, LoginActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
} else {
Log.i(TAG, currentUser.getUsername());
}
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).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.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();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
}

Functions are not closed properly.
import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.app.ActionBar;
import android.util.Log;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import com.parse.Parse;
import com.parse.ParseAnalytics;
import com.parse.ParseObject;
import com.parse.ParseUser;
public class MainActivity extends AppCompatActivity{
public static final String TAG = MainActivity.class.getSimpleName();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
// Parase Analytice
ParseAnalytics.trackAppOpenedInBackground(getIntent());
ParseUser currentUser = ParseUser.getCurrentUser();
if (currentUser == null) {
Intent intent = new Intent(this, LoginActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
} else {
Log.i(TAG, currentUser.getUsername());
}
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
}//CLOSE ONCREATE here
#Override
public boolean onCreateOptionsMenu(Menu menu){
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.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();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}

replace
#Override
public boolean onCreateOptionsMenu(Menu menu){
with
}
#Override
public boolean onCreateOptionsMenu(Menu menu){
and replace
**public boolean onOptionsItemSelected (MenuItem item){**
with
public boolean onOptionsItemSelected (MenuItem item){

Android: Navigation drawer indication not working

I am following a tutorial on YouTube, but I'm stuck at (+/- 41 min).
I'm expected to see a indication when I click on a menu item, but this doesn't happen.
The picture below shows how it's supposed to look:
how it should look:
Main Code:
package com.example.flori.mylordring;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Adapter;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ImageButton;
import android.widget.ListView;
import android.widget.Toast;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity implements AdapterView.OnItemClickListener{
private static ImageButton imgView;
private int test;
int [] images = {R.drawable.im1,R.drawable.im2,R.drawable.im3,R.drawable.im4,R.drawable.im5,R.drawable.im6,R.drawable.im7};
private ActionBarDrawerToggle actionBarDrawerToggle;
private DrawerLayout drawerLayout;
private ListView navList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
drawerLayout = (DrawerLayout)findViewById(R.id.drawerLayout);
navList = (ListView)findViewById(R.id.navlist);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
ArrayList<String> navArray = new ArrayList<String>();
navArray.add("Home");
navArray.add("Fragment 1");
navArray.add("Fragment 2");
navArray.add("Fragment 3");
navArray.add("Fragment 4");
navArray.add("Fragment 5");
navList.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,navArray);
navList.setAdapter(adapter);
actionBarDrawerToggle = new ActionBarDrawerToggle(this,drawerLayout,R.string.opendrawer,R.string.closedrawer);
drawerLayout.setDrawerListener(actionBarDrawerToggle);
ActionBar actionBar = getSupportActionBar();
actionBar.setDisplayShowHomeEnabled(true);
actionBar.setDisplayHomeAsUpEnabled(true);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Rolololo", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
}
#Override
protected void onPostCreate(Bundle saveInstancesState){
super.onPostCreate(saveInstancesState);
actionBarDrawerToggle.syncState();
}
public void image(View view){
imgView=(ImageButton)findViewById(R.id.imageButton);
imgView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
test++;
test = test % images.length;
imgView.setImageResource(images[test]);
}
}
);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.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();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}else if(id == android.R.id.home){
if(drawerLayout.isDrawerOpen(navList)){
drawerLayout.closeDrawer(navList);
}else{
drawerLayout.openDrawer(navList);
}
}
return super.onOptionsItemSelected(item);
}
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
switch (position){
case 0:
break;
case 1:
break;
case 2:
break;
case 3:
break;
case 4:
break;
case 5:
break;
}
}
}
thank you in advance ;)

try to implement NavigationView.OnNavigationItemSelectedListener instead of AdapterView.OnItemClickListener and implement this method:
#SuppressWarnings("StatementWithEmptyBody")
#Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_camara) {
// Handle the camera action
} else if (id == R.id.nav_manage) {
} else if (id == R.id.nav_share) {
} else if (id == R.id.nav_send) {
} else if (id == R.id.add_goal) {
}
Implementing NavigationDrawer is easy with the latest version of Android Studio. Just create new Activity from File-New-Activity-Navigation Drawer Activity.
Here is a good tutorial with the latest Navigation View

setOnCheckedChangeListener(this) error

I'm beginner in android.
I read some books. I create checkbox
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
public class MainActivity extends AppCompatActivity implements OnCheckedChangeListener {
CheckBox cb;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
cb = (CheckBox) findViewById(R.id.mycheckbox);
cb.setOnCheckedChangeListener(this);
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.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();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
#Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked) {
cb.setText("Checked");
} else {
cb.setText("UnCheck");
}
}
}
When use cb.setOnCheckedChangeListener(this); android studio error:
setOnCheckedChangeListener(android.widget.CompoundButton.OnCheckedChangeListener) in CompoundButton cannot be applied (anonymous android.view.View.onClickListener)
If i change code such as:
cb.setOnCheckedChangeListener(new OnCheckedChangeListener() {
#Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
//do stuff
}
});
Then ok
Can you help me. i want to use "this".

Use MainActivity.this instead of this :
cb.setOnCheckedChangeListener(MainActivity.this);
Because in current code this refer to the Button onClick method context instead of MainActivity class in which OnCheckedChangeListener interface in implemented.

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