I have a textview in my xml and I want to change the text from an intent. I've tried it before in the same class but on another xml and it works there. But after changing the contentView it don't work anymore. I want to set the displayName.
package de.myapp.app;
import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.view.View;
import android.support.design.widget.NavigationView;
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.view.Menu;
import android.view.MenuItem;
import android.widget.EditText;
import android.widget.TextView;
public class UserAreaActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setTitle("");
//setContentView(R.layout.nav_header_user_area);
//final TextView displayName = (TextView) findViewById(R.id.displayName);
//Intent intent = getIntent();
//String dpdisplayName = intent.getStringExtra("displayName");
//displayName.setText(dpdisplayName);
setContentView(R.layout.activity_user_area);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
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.setDrawerListener(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 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) {
// Handle the camera action
} else if (id == R.id.nav_gallery) {
} else if (id == R.id.nav_slideshow) {
} else if (id == R.id.nav_manage) {
} 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;
}
}
XML:
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="#dimen/nav_header_vertical_spacing"
android:text="Mr. Android"
android:textAppearance="#style/TextAppearance.AppCompat.Body1"
android:id="#+id/displayName" />
[UPDATED] Use like this:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setTitle("");
setContentView(R.layout.activity_user_area);
Intent intentMain = getIntent();
String dpdisplayName = intentMain.getStringExtra("displayName");
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
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.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
View headerView = navigationView.getHeaderView(0);
TextView navdisplayName = (TextView) headerView.findViewById(R.id.displayName);
navdisplayName.setText(dpdisplayName);
}
At First Remove
Calling Multiple time
setContentView(R.layout.activity_user_area); // Remove from 2nd time
Final View
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//Dont call setTitle(""); Here
setContentView(R.layout.nav_header_user_area);
final TextView displayName = (TextView) findViewById(R.id.displayName);
Intent intent = getIntent();
String dpdisplayName = intent.getStringExtra("displayName");
displayName.setText(dpdisplayName);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
setTitle("");
//code goes on here
}
while setting setContentView() second time, you have eventually changes your attached view hierarchy tree. Your changes to textview will no longer be visible since its not even attached to the activity
Related
I am trying to show email from login.java page in the navigation drawer after they login to Android App. I am getting a FATAL EXCEPTION error and java.lang.NullPointerException when I run.
I have put code into DoctorHome.java:
package com.example.medicationmanagementsystem;
import android.content.Intent;
import android.os.Bundle;
import android.view.MenuItem;
import android.widget.EditText;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.appcompat.app.ActionBarDrawerToggle;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import androidx.core.view.GravityCompat;
import androidx.drawerlayout.widget.DrawerLayout;
import com.example.medicationmanagementsystem.DAO.DatabaseHelper;
import com.google.android.material.navigation.NavigationView;
public class DoctorHome extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {
private DrawerLayout drawer;
TextView txtDisplayEmail;
DatabaseHelper myDb;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.doctor_layout);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
drawer = findViewById(R.id.drawer_layout);
txtDisplayEmail = findViewById(R.id.emaildisplay);
txtDisplayEmail.setText(myDb.getEmail());
NavigationView navigationView = findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this, drawer, toolbar,
R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.addDrawerListener(toggle);
toggle.syncState();
}
//END
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem menuItem) {
switch (menuItem.getItemId()) {
case R.id.nav_createprescription:
Intent createpresintent = new Intent(DoctorHome.this, MainActivity.class);
startActivity(createpresintent);
break;
case R.id.viewprescriptions:
Intent presintent = new Intent(DoctorHome.this, ViewListContents.class);
startActivity(presintent);
break;
case R.id.nav_addpatients:
Intent createpatientintent = new Intent(DoctorHome.this, NewPatient.class);
startActivity(createpatientintent);
break;
case R.id.nav_viewpatients:
Intent viewpatientintent = new Intent(DoctorHome.this, ViewPatientListContents.class);
startActivity(viewpatientintent);
break;
case R.id.nav_logout:
Intent logoutintent= new Intent(DoctorHome.this, Login.class);
startActivity(logoutintent);
break;
}
drawer.closeDrawer(GravityCompat.START);
return true;
}
#Override
public void onBackPressed() {
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
}
DatabaseHelper.java
//getting email
public String getEmail() throws SQLException {
String email = "";
Cursor cursor = this.getReadableDatabase().query(
TABLE_USERS, new String[] {COL_USER_EMAIL},
null, null, null, null, null);
if (cursor.moveToFirst()) {
do {
email = cursor.getString(0);
} while (cursor.moveToNext());
}
cursor.close();
return email;
}
I am using SQLite as the database to save user details. I just need the email from this to display in the textview emaildisplay in the navigation header. Any help would be appreciated. Thank you!!
First you have to initialize myDb before using it like this:
myDb = new DatabaseHelper(this);
Also txtDisplayEmail is not inside your activity's layout, so this:
txtDisplayEmail = findViewById(R.id.emaildisplay);
returns null.
What you should do is find txtDisplayEmail inside the NavigationView's header.
Change to this:
myDb = new DatabaseHelper(this);
drawer = findViewById(R.id.drawer_layout);
NavigationView navigationView = findViewById(R.id.nav_view);
View header = navigationView.getHeaderView(0);
txtDisplayEmail = (TextView) header.findViewById(R.id.emaildisplay);
txtDisplayEmail.setText(myDb.getEmail());
navigationView.setNavigationItemSelectedListener(this);
But the method getEmail() of DatabaseHelper does not return the user's email (if this is what it is supposed to do).
It just loops over all the emails of the table and returns the last one.
So change it to return the email of the logged in user.
instead of findViewById(R.id.emaildisplay);
try navigationView.findViewById(R.id.emaildisplay);
I assume emaildisplay is part of nvigationView not the activity layout.
I am creating a application which contains Navigation Drawer Activity. I am loading different Fragments in my main Screen. Now when I have to call Fragment at that time it works fine but when I want to call some sort of service like call, image picker at that time I added setNavigationItemSelectedListener which is works fine but all other fragments are not loading now.
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
drawer = findViewById(R.id.drawer_layout);
NavigationView navigationView = findViewById(R.id.nav_view);
// Passing each menu ID as a set of Ids because each
// menu should be considered as top level destinations.
mAppBarConfiguration = new AppBarConfiguration.Builder(
R.id.nav_home, R.id.nav_gallery, R.id.nav_slideshow, R.id.nav_franchise,
R.id.nav_tieUP, R.id.nav_giftVoucher, R.id.nav_faq, R.id.nav_privacy_policy,
R.id.nav_tools, R.id.nav_send)
.setDrawerLayout(drawer)
.build();
NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
NavigationUI.setupActionBarWithNavController(this, navController, mAppBarConfiguration);
NavigationUI.setupWithNavController(navigationView, navController);
navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem menuItem) {
int id = menuItem.getItemId();
if (id == R.id.callUs) {
Intent intent = new Intent(Intent.ACTION_CALL);
intent.setData(Uri.parse("tel:" + "XXXxxxXXX"));
if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.CALL_PHONE},REQUEST_PHONE_CALL);
}
else
{
startActivity(intent);
}
}
drawer.closeDrawer(GravityCompat.START);
return true;
}
});
}
When you call NavigationUI.setupWithNavController(navigationView, navController), you're saying that you want NavController to handle click events from your NavigationView, navigating to the related screen as per the NavigationUI documentation. This, by necessity, calls setNavigationItemSelectedListener() internally.
By calling setNavigationItemSelectedListener afterwards, you remove the original listener, which is why your other items don't do anything anymore. You can trigger the default behavior by calling NavigationUI.onNavDestinationSelected()
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem menuItem) {
int id = menuItem.getItemId();
if (id == R.id.callUs) {
Intent intent = new Intent(Intent.ACTION_CALL);
intent.setData(Uri.parse("tel:" + "XXXxxxXXX"));
if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.CALL_PHONE},REQUEST_PHONE_CALL);
}
else
{
startActivity(intent);
}
}
else
{
// Make your navController object final above
// or call Navigation.findNavController() again here
NavigationUI.onNavDestinationSelected(menuItem, navController);
}
drawer.closeDrawer(GravityCompat.START);
return true;
}
I tried to make a fragment and made a drawer here is my code:
import android.support.v4.app.FragmentManager;
import android.support.v4.app.Fragment;
import android.content.res.Configuration;
import android.support.design.widget.Snackbar;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.support.v7.widget.Toolbar;
import android.support.design.widget.NavigationView;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
public class MainActivity extends AppCompatActivity implements View.OnClickListener, NavigationView.OnNavigationItemSelectedListener{
private Toolbar mToolBar;
private NavigationView mDrawer;
private ActionBarDrawerToggle mdrawerToggle;
private DrawerLayout mDrawerLayout;
private RelativeLayout digitalFrontier;
private RelativeLayout forwardThinkers;
private RelativeLayout preferedActions;
private LinearLayout innerParent;
public String viewVar;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initViews();
digitalFrontier.setOnClickListener(this);
forwardThinkers.setOnClickListener(this);
preferedActions.setOnClickListener(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 onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
mdrawerToggle.onConfigurationChanged(newConfig);
}
private void initViews(){
mToolBar = (Toolbar) findViewById(R.id.app_bar);
setSupportActionBar(mToolBar);
mDrawer = (NavigationView) findViewById(R.id.main_drawer);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_parent);
mdrawerToggle = new ActionBarDrawerToggle(
this,
mDrawerLayout,
mToolBar,
R.string.drawer_open,
R.string.drawer_close);
mDrawerLayout.setDrawerListener(mdrawerToggle);
// indicator based on whether the drawerlayout is in open or closed
mdrawerToggle.syncState();
digitalFrontier = (RelativeLayout) findViewById(R.id.digital_frontier);
forwardThinkers = (RelativeLayout) findViewById(R.id.forward_thinkers);
preferedActions = (RelativeLayout) findViewById(R.id.prefered_actions);
innerParent = (LinearLayout) findViewById(R.id.inner_parent);
mDrawer.setNavigationItemSelectedListener(this);
}
#Override
public void onClick(View v) {
if(v.getId() == R.id.digital_frontier || v.getId() == R.id.forward_thinkers ||
v.getId() == R.id.prefered_actions ){
detailActivity(v);
}
}
private void detailActivity(View view){
switch (view.getId()){
case R.id.digital_frontier:
viewVar = "digital frontier";
break;
case R.id.forward_thinkers:
viewVar = "forward thinkers";
break;
case R.id.prefered_actions:
viewVar = "prefered actions";
break;
}
Snackbar.make(mDrawerLayout, viewVar , Snackbar.LENGTH_LONG).show();
}
#Override
public boolean onNavigationItemSelected(MenuItem menuItem) {
selectDrawerItem(menuItem);
return false;
}
public void selectDrawerItem(MenuItem menuItem) {
// Create a new fragment and specify the planet to show based on
// position
Fragment fragment = null;
Class fragmentClass = null;
switch(menuItem.getItemId()) {
case R.id.agency_menu_item:
fragmentClass = FragmentAgency.class;
break;
}
try {
fragment = (Fragment) fragmentClass.newInstance();
} catch (Exception e) {
e.printStackTrace();
}
// Insert the fragment by replacing any existing fragment
FragmentManager fragmentManager = this.getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.fragment_content,
fragment).commit();
// Highlight the selected item, update the title, and close the drawer
menuItem.setChecked(true);
setTitle(menuItem.getTitle());
//mDrawer.closeDrawers();
}
I am trying to include the generation of a random number in an android project with Navigation Drawer Menu. For the latter I’ve been following a youtube tutorial (Android Development Tutorials #12 - Generating a Random Number) which worked perfectly, but only in a basic android studio project. Being a java-newbie, I get stuck when trying to include the same Java Code into MainActivity.java that already contains the code for the Navigation Drawer Menu. I assume that the spot where I insert the respective sample code for number generation (Lines 114 to 126 in snippet) must be wrong somehow, and I’ve been trying different approaches within the file. But I always get the error: unreachable statement (in Line 114). Thx for any help in advance!
package...
import android.app.FragmentManager;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.view.View;
import android.support.design.widget.NavigationView;
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.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
#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();
}
});
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.setDrawerListener(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();
FragmentManager fragmentManager = getFragmentManager();
if (id == R.id.nav_first_layer) {
fragmentManager.beginTransaction()
.replace(R.id.content_frame
, new FirstFragment())
.commit();
} else if (id == R.id.nav_second_layer) {
fragmentManager.beginTransaction()
.replace(R.id.content_frame
, new SecondFragment())
.commit();
} else if (id == R.id.nav_third_layer) {
fragmentManager.beginTransaction()
.replace(R.id.content_frame
, new ThirdFragment())
.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;
final TextView textOne = (TextView) findViewById(R.id.rndsampletext);
Button pushMe = (Button) findViewById(R.id.rndsamplebutton);
final String [] txtOptions = {"One", "Two", "Three"};
pushMe.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v) {
int rando = (int) (Math.random() * 3);
textOne.setText(txtOptions[rando]);
};
});
}
}
you are returning true at begining:
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true; // here
it should be after u generate the random number:
I suggest u add the code to your onCreate() method of the activity
Like:
#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();
}
});
//move this here
final TextView textOne = (TextView) findViewById(R.id.rndsampletext);
Button pushMe = (Button) findViewById(R.id.rndsamplebutton);
final String [] txtOptions = {"One", "Two", "Three"};
pushMe.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v) {
int rando = (int) (Math.random() * 3);
textOne.setText(txtOptions[rando]);
};
});
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.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
}
public class Navigationmenu extends AppCompatActivity {
private DrawerLayout mDrawerLayout;
private ActionBarDrawerToggle mToggle;
private Toolbar mToolbar;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_navigationmenu);
mDrawerLayout = (DrawerLayout)findViewById(R.id.drawerLayout);
mToggle = new ActionBarDrawerToggle(this,mDrawerLayout,R.string.Open,R.string.Close );
mToolbar = (Toolbar)findViewById(R.id.nav_action);
setSupportActionBar(mToolbar);
mDrawerLayout.addDrawerListener(mToggle);
mToggle.syncState();
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
if(mToggle.onOptionsItemSelected(item))
{
return true;
}
return super.onOptionsItemSelected(item);
}
}
Error.
How can I fix it?? My app is being forced to close when I click the button. Any one can help me please?
Error showing at "super.onCreate(savedInstanceState);" I don't know how to fix it.
I am unsure by your pictures but it seems that you are trying to add a navigation drawer to your project. You cannot add a navigation drawer on top of pre-existing code, rather it would be more cumbersome to do it that way.
In order to get the navigation drawer working you have to add some other code rather than what Android Studio provides. If you are adding a navigation drawer than the code needs to be added to MainActivity.java rather than its own file, and then you can implement that in each other fragment class to make the navigation drawer work.
What you might try adding is something like
public class Navigationmenu extends AppCompatActivity {
//Try this piece here
NavigationView navigationView = null;
private DrawerLayout mDrawerLayout;
private ActionBarDrawerToggle mToggle;
private Toolbar mToolbar;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_navigationmenu);
mDrawerLayout = (DrawerLayout)findViewById(R.id.drawerLayout);
mToggle = new ActionBarDrawerToggle(this,mDrawerLayout,R.string.Open,R.string.Close );
mToolbar = (Toolbar)findViewById(R.id.nav_action);
setSupportActionBar(mToolbar);
mDrawerLayout.addDrawerListener(mToggle);
mToggle.syncState();
//Try adding this to the code
navigationView = (NavigationView) findViewById(R.id.nav_view); //Declared in activity_main.xml
navigationView.setNavigationItemSelectedListener(this);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
if(mToggle.onOptionsItemSelected(item))
{
return true;
}
return super.onOptionsItemSelected(item);
}
}
If you are trying to make a Navigation Drawer with fragments, look to this complete MainActivity.java I have made, and note that everything in Navigation drawers runs on Fragments.
import android.net.Uri;
import android.os.Bundle;
import android.support.design.widget.NavigationView;
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.view.Menu;
import android.view.MenuItem;
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener, MainFragment.OnFragmentInteractionListener, LoginFragment.OnFragmentInteractionListener {
NavigationView navigationView = null;
Toolbar toolbar = null;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
MainFragment fragment = new MainFragment();
android.support.v4.app.FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, fragment);
fragmentTransaction.commit();
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.setDrawerListener(toggle);
toggle.syncState();
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.main) {
MainFragment fragment = new MainFragment();
android.support.v4.app.FragmentTransaction fragmentTransaction =
getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, fragment);
fragmentTransaction.commit();
} else if (id == R.id.login) {
LoginFragment fragment = new LoginFragment();
android.support.v4.app.FragmentTransaction fragmentTransaction =
getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.fragment_container, fragment);
fragmentTransaction.commit();
} else if (id == R.id.nav_slideshow) {
} else if (id == R.id.nav_manage) {
} 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 onFragmentInteraction(Uri uri) {
//Leave blank
}
}
I have a class named MainActivity.java, this java contains Navigation Bar code.
If I want to build another activity named Contact.java and there also contains Navigation Bar code. How do I reuse Navigation Bar code from MainActivity.java to Contact.java? Can I create a class to solve it?
Here is my code:
package com.thisistap.isuper.www.contactbook;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.support.design.widget.NavigationView;
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.view.MenuItem;
import android.widget.Button;
import android.widget.TabHost;
import com.thisistap.isuper.www.contactbook.nav.*;
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
private Button contact_button;
private TabHost mTabHost = null;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// defined elements from layout (it can be modified)
contact_button = (Button) findViewById(R.id.contact_button);
// --- [Start] defined elements from Navigation Bar (it cannot be modified from here) ---
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
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.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
// --- [End] defined elements from Navigation Bar (it cannot be modified from here) ---
// --- [Start] Button Group ---
contact_button.setOnClickListener(new Button.OnClickListener() {
#Override
public void onClick(View v) {
Intent myIntent = new Intent(MainActivity.this,Contact.class);
MainActivity.this.startActivity(myIntent);
}
});
// --- [End] Button Group ---
}
// --- [Start] Navigation Bar Action (it cannot be modified from here) ---
#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 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();
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) {
Intent myIntent = new Intent(MainActivity.this,Contact.class);
MainActivity.this.startActivity(myIntent);
} else if (id == R.id.nav_gallery) {
} else if (id == R.id.nav_slideshow) {
} else if (id == R.id.nav_manage) {
} 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;
}
// --- [End] Navigation Bar Action (it cannot be modified from here) ---
}
I suggest you extendig your activities from a base activity and implement your common logic into this parent.
Just do this - Take all your drawer code in a BaseActivity and in XML of BaseActivity put DrawerLayout as parent along with a container(like you do it for fragments) and NavigationView. You can also look at this answer. It addresses the same issue.
Then extend BaseActivity to your MainActivity and instead of using setContentView(), inflate it in the container of your BaseActivity.
public class BaseActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// --- [Start] defined elements from Navigation Bar (it cannot be modified from here) ---
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
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.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
// --- [End] defined elements from Navigation Bar (it cannot be modified from here) ---
}
// --- [Start] Navigation Bar Action (it cannot be modified from here) ---
#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 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();
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) {
Intent myIntent = new Intent(MainActivity.this,Contact.class);
MainActivity.this.startActivity(myIntent);
} else if (id == R.id.nav_gallery) {
} else if (id == R.id.nav_slideshow) {
} else if (id == R.id.nav_manage) {
} 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;
}
// --- [End] Navigation Bar Action (it cannot be modified from here) ---
}
Then extend in your MainActivity -
public class MainActivity extends BaseActivity{
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
FrameLayout containerParent = (FrameLayout) findViewById(R.id.container);
getLayoutInflater().inflate(R.layout.activity_main, containerParent);
contact_button = (Button) findViewById(R.id.contact_button);
}
}
Your BaseActivity XML should be like this -
<DrawerLayout --->
<FrameLayout ---/>
<NavigationView-------/>
</DrawerLayout/>