Back button not working in fragments

Back button not working in fragments - android

I have a MainActivity and some fragments and am using WebView to load some site in all the fragments. Before I wasn't able to go to previous page on press of back button but now I am able to. I have everything working but I can't get a fragment to load on startup. If I add this code in the MainActivity to load a fragment automatically, it works but it breaks the back key navigation in other fragments,
getFragmentManager().beginTransaction()
.replace(R.id.content_frame
, new aboutus())
.addToBackStack(null).commit();
Is there any other way by which I can load a fragment by default on startup? Here is my MainActivity (including the code to open fragment automatically) ,
package com.science.s11;
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 {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getFragmentManager().beginTransaction()
.replace(R.id.content_frame
, new aboutus())
.addToBackStack(null).commit();
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 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);
}
#Override
public void onBackPressed() {
if (aboutus.mWebView!= null) {
if (aboutus.mWebView.canGoBack()) {
aboutus.mWebView.goBack();
} else {
if (getFragmentManager().getBackStackEntryCount() > 1) {
getFragmentManager().popBackStack();
}else{
finish();}
}
}
else if(amp.mWebView!= null){
if ( amp.mWebView.canGoBack()){
amp.mWebView.goBack();
}else {
if (getFragmentManager().getBackStackEntryCount() > 1) {
getFragmentManager().popBackStack();
}else{
finish();}
}
}
else if(ask.mWebView!= null){
if ( ask.mWebView.canGoBack()){
ask.mWebView.goBack();
}else {
if (getFragmentManager().getBackStackEntryCount() > 1) {
getFragmentManager().popBackStack();
}else{
finish();}
}
}
else if(feedback.mWebView!= null){
if ( feedback.mWebView.canGoBack()){
feedback.mWebView.goBack();
}else {
if (getFragmentManager().getBackStackEntryCount() > 1) {
getFragmentManager().popBackStack();
}else{
finish();}
}
}
else if(subscribe.mWebView!= null){
if ( subscribe.mWebView.canGoBack()){
subscribe.mWebView.goBack();
}else {
if (getFragmentManager().getBackStackEntryCount() > 1) {
getFragmentManager().popBackStack();
}else{
finish();}
}
}
else{
super.onBackPressed();
}
}
#SuppressWarnings("StatementWithEmptyBody")
#Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
android.app.FragmentManager fragmentManager = getFragmentManager();
if (id == R.id.nav_aboutus) {
fragmentManager.beginTransaction()
.replace(R.id.content_frame
, new aboutus())
.addToBackStack(null).commit();
// Handle the camera action
} else if (id == R.id.nav_amp) {
fragmentManager.beginTransaction()
.replace(R.id.content_frame
, new amp())
.addToBackStack(null).commit();
} else if (id == R.id.nav_ask) {
fragmentManager.beginTransaction()
.replace(R.id.content_frame
, new ask())
.addToBackStack(null).commit();
} else if (id == R.id.nav_feedback) {
fragmentManager.beginTransaction()
.replace(R.id.content_frame
, new feedback())
.addToBackStack(null).commit();
} else if (id == R.id.nav_subscribe) {
fragmentManager.beginTransaction()
.replace(R.id.content_frame
, new subscribe())
.addToBackStack(null).commit();
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
}
Here is a sample code which I have in all my fragments
package com.science.s11;
import android.app.Fragment;
import android.content.Context;
import android.graphics.Bitmap;
import android.net.ConnectivityManager;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.net.NetworkInfo;
public class aboutus extends Fragment {
public static WebView mWebView;
public ProgressBar progressBar;
public LinearLayout layoutProgress;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.aboutus, container, false);
mWebView = (WebView) v.findViewById(R.id.aboutuswebView);
progressBar = (ProgressBar) v.findViewById(R.id.progressBar);
layoutProgress = (LinearLayout) v.findViewById(R.id.layoutProgress);
mWebView.setVisibility(View.GONE);
mWebView.getSettings().setCacheMode(WebSettings.LOAD_DEFAULT);
WebSettings webSettings = mWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
mWebView.getSettings().setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK);
WebSettings settings = mWebView.getSettings();
settings.setSupportMultipleWindows(true);
settings.setBuiltInZoomControls(false);
settings.setSupportZoom(false);
settings.setDisplayZoomControls(false);
mWebView.setWebViewClient(new WebViewClient() {
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
#Override
public void onPageFinished(WebView view, String url) {
mWebView.setVisibility(View.VISIBLE);
layoutProgress.setVisibility(View.GONE);
progressBar.setIndeterminate(true);
super.onPageFinished(view, url);
}
#Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
layoutProgress.setVisibility(View.VISIBLE);
progressBar.setIndeterminate(false);
super.onPageStarted(view, url, favicon);
}
});
if (isOnline()) {
mWebView.loadUrl("http://science19.com/index.php");
} else {
mWebView.loadUrl("file:///android_asset/cti.html");
}
return v;
}
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK) && mWebView.canGoBack()) {
mWebView.goBack();
return true;
}
return onKeyDown(keyCode, event);
}
public static boolean canGoBack(){
return mWebView.canGoBack();
}
public static void goBack(){
mWebView.goBack();
}
public boolean isOnline() {
ConnectivityManager cm = (ConnectivityManager) getActivity().getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netInfo = cm.getActiveNetworkInfo();
return (netInfo != null && netInfo.isConnected());
}
}
EDIT (added explanation): I actually want to show a fragment on startup of app, the fragment contains WebView. I can do that using this code,
getFragmentManager().beginTransaction()
.replace(R.id.content_frame
, new aboutus())
.addToBackStack(null).commit();
But I even have other fragments and each and everyone has the ability to go back to previous page on back press. Whenever I use this code, I can't go back to previous page on back press on other fragments, it just works in the fragment which is opened using the code, here it is aboutus. So, why is this actually happening and how can I fix it?

With AppCompatActivity use
getSupportFragmentManager()
instead of
getFragmentManager()

Related

I can't click on my navigation drawer

I am struggling to get the Navigation drawer items to register and start and intent for a new activity. The drawer opens fine and is displayed correctly but nothing happens when I click on the items in the list. Here is my code
package radiofm.arabel;
import android.app.ProgressDialog;
import android.content.Intent;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.util.Log;
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.ImageButton;
import static android.widget.AbsListView.OnScrollListener.SCROLL_STATE_IDLE;
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
ImageButton id_play,id_pause;
private Button btn;
private boolean playPause;
private MediaPlayer mediaPlayer;
private ProgressDialog progressDialog;
private boolean initialStage = true;
FragmentTransaction fragmentTransaction;
NavigationView navigationView;
private DrawerLayout mDrawerLayout;
private ActionBarDrawerToggle mToggle;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
Log.d("myTag", "This is my toolbar");
id_play = (ImageButton) findViewById(R.id.id_play);
mediaPlayer = new MediaPlayer();
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
progressDialog = new ProgressDialog(this);
id_play.setEnabled(true);
id_play.setImageResource(R.drawable.play);
id_play.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (!playPause) {
id_play.setImageResource(R.drawable.pause);
if (initialStage) {
Log.d("myTag", "This is my excute");
new Player().execute("http://arabelfm.ice.infomaniak.ch/arabelprodcastfm.mp3");
} else {
Log.d("myTag", "This is my beforestart");
if (!mediaPlayer.isPlaying())
Log.d("myTag", "This is my afterstart");
mediaPlayer.start();
}
playPause = true;
} else {
id_play.setImageResource(R.drawable.play);
Log.d("myTag", "This is my beforestop");
if (mediaPlayer.isPlaying()) {
Log.d("myTag", "This is afterstop");
mediaPlayer.reset();
}
playPause = false;
}
}
});
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
protected void onPause() {
super.onPause();
if (mediaPlayer != null) {
mediaPlayer.reset();
mediaPlayer.release();
mediaPlayer = null;
}
}
class Player extends AsyncTask<String, Void, Boolean> {
#Override
protected Boolean doInBackground(String... strings) {
Boolean prepared = false;
try {
mediaPlayer.setDataSource(strings[0]);
mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
#Override
public void onCompletion(MediaPlayer mediaPlayer) {
Log.d("myTag", "This is my listnner");
initialStage = true;
playPause = false;
id_play.setImageResource(R.drawable.play);
mediaPlayer.stop();
mediaPlayer.reset();
}
});
mediaPlayer.prepare();
prepared = true;
} catch (Exception e) {
// Log.e("MyAudioStreamingApp", e.getMessage());
prepared = false;
}
return prepared;
}
#Override
protected void onPostExecute(Boolean aBoolean) {
super.onPostExecute(aBoolean);
if (progressDialog.isShowing()) {
progressDialog.cancel();
}
mediaPlayer.start();
initialStage = true;
}
#Override
protected void onPreExecute() {
super.onPreExecute();
progressDialog.setMessage("Buffering...");
//progressDialog.show();
}
}
#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);
}
private void displaySelectedScreen(int id)
{
Fragment fragment=null;
Log.d("myTag", "This is my displ");
switch (id){
case R.id.nav_alarm:
fragment = new Add_Alarm();
break;
}
if (fragment !=null)
{
FragmentTransaction ft =getSupportFragmentManager().beginTransaction();
ft.replace(R.id.content_main,fragment);
ft.commit();
}
}
#SuppressWarnings("StatementWithEmptyBody")
#Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
Fragment fragment = null;
if (id == R.id.nav_alarm) {
Intent goToNextActivity = new Intent(getApplicationContext(), Main2Activity.class);
startActivity(goToNextActivity);
}
FragmentTransaction ft =getSupportFragmentManager().beginTransaction();
ft.replace(R.id.content_main,fragment);
ft.addToBackStack(null);
ft.commit();
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
}

try change your code inside onNavigationItemSelected to this:
switch (item.getItemId()){
case R.id.nav_alarm:
//do stuff
Intent goToNextActivity = new Intent(getApplicationContext(), Main2Activity.class);
startActivity(goToNextActivity);
break;
}
FragmentTransaction ft =getSupportFragmentManager().beginTransaction();
ft.replace(R.id.content_main,fragment);
ft.addToBackStack(null);
ft.commit();
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;

You should check your onNavigationItemSelected(MenuItem item) method because while replacing the fragment you initailized you fragment null like Fragment fragment = null; .So, for replace the fragment you need to take actual fragment instead of null fragmnet.
You may go through about the fragments here.
`

Change the flow of the code as below:
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
item.setCheckable(false);
Fragment fragment=null;
switch (item.getItemId()) {
case R.id.navigation_home:
fragment = new HomeFragment();
break
}
loadHomeFragment(fragment);
mDrawerLayout.closeDrawer(GravityCompat.START);
return true;
}
private void loadHomeFragment(Fragment fragment) {
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.setCustomAnimations(android.R.anim.fade_in,
android.R.anim.fade_out);
fragmentTransaction.replace(R.id.frame, fragment);
fragmentTransaction.commitAllowingStateLoss();
}

Fragment doesn't replace in Navigation Drawer

I'm creating a Navigation Drawer like this
MainActivity.java
import android.support.v4.app.FragmentManager;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.NavigationView;
import android.support.design.widget.Snackbar;
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.view.View;
import com.paperwrrk.videos.FragmentVideo;
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 = getSupportFragmentManager();
if (id == R.id.nav_home) {
// Handle the camera action
} else if (id == R.id.nav_articles) {
} else if (id == R.id.nav_videos) {
fragmentManager.beginTransaction()
.replace(R.id.content_frame, new FragmentVideo())
.addToBackStack(null)
.commit();
} else if (id == R.id.fb_posts) {
} 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;
}
}
My FragmentVideo
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.paperwrrk.R;
public class FragmentVideo extends Fragment {
View myView;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
myView = inflater.inflate(R.layout.fragment_video, container, false);
return myView;
}
}
But when I click on the item from Navigation Drawer second fragment doesn't replace or hide the first one, it is overlapping like this
Please see the screenshot

Use a container instead of using fragment tag
<FrameLayout
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="Hello World!" />
Now in activity
if(condition)
getSupportFragmentManager().beginTransaction().replace(R.id.container,new FirstFragment()).commit();
else
getSupportFragmentManager().beginTransaction().replace(R.id.container, new SecondFragment()).commit();
if this not works try to get the fragment container view ID..Here's the code:
transaction.replace(((ViewGroup)(getView().getParent())).getId(), fragment);

It works for me...
int id = item.getItemId();
android.app.Fragment fragment = null;
if (id == R.id.nav_profile) {
fragment = new ProfileActivity();
if (fragment != null) {
android.app.FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.content_frame, fragment).commit();
}

issues with onBackpressed and ProgressDialog in android fragment for webview

In my android app i have created 4 tabs with the fragment and each tab loads different URL, which works fine but,
1) how do i add onBackpressed to each webview to load previous page on back click? I know how to do it in java class but Override doesn't work in Fragment.
2) my second question is I have added a ProgressDialog to each webview which works fine but covers whole layout until full webpage is loaded, how do i make it show only on top like browsers, while able to view and scroll loaded webpage?
Following is my code for fragment.
GoogleFragment.java
Public class GoogleFragment extends Fragment {
WebView myWebView;
ProgressDialog pd;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_webview, container, false);
final ProgressDialog pd = ProgressDialog.show(getContext(), "", "Loading Please wait...", true);
myWebView = (WebView) v.findViewById(R.id.WebView);
myWebView.getSettings().setJavaScriptEnabled(true);
myWebView.loadUrl("http://www.google.com/");
WebSettings webSettings = myWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
//improve webView performance
myWebView.getSettings().setRenderPriority(WebSettings.RenderPriority.HIGH);
myWebView.getSettings().setCacheMode(WebSettings.LOAD_DEFAULT);
myWebView.getSettings().setAppCacheEnabled(true);
myWebView.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
webSettings.setDomStorageEnabled(true);
webSettings.setLayoutAlgorithm(WebSettings.LayoutAlgorithm.NARROW_COLUMNS);
webSettings.setUseWideViewPort(true);
webSettings.setSavePassword(true);
webSettings.setSaveFormData(true);
webSettings.setEnableSmoothTransition(true);
myWebView.setWebViewClient(new WebViewClient() {
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
}
#Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
pd.show();
}
#Override
public void onPageFinished(WebView view, String url) {
pd.dismiss();
String webUrl = myWebView.getUrl();
}
});
return v;
}
}
MainActivity.java
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.support.design.widget.NavigationView;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
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.MenuInflater;
import android.view.MenuItem;
import android.widget.Toast;
import com.google.android.gms.ads.InterstitialAd;
import com.google.android.gms.analytics.GoogleAnalytics;
import com.nav.R;
import com.nav.fragments.TabFragment;
import java.util.Timer;
public class MainActivity extends AppCompatActivity {
Toolbar toolbar;
DrawerLayout mDrawerLayout;
NavigationView mNavigationView;
FragmentManager mFragmentManager;
FragmentTransaction mFragmentTransaction;
private InterstitialAd interstitial;
public Timer AdTimer;
SharedPreferences preferences;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
preferences = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
toolbar = (Toolbar) findViewById(R.id.toolbar);
if (toolbar != null) {
setSupportActionBar(toolbar);
}
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mNavigationView = (NavigationView) findViewById(R.id.main_drawer) ;
int width = getResources().getDisplayMetrics().widthPixels/2;
DrawerLayout.LayoutParams params = (android.support.v4.widget.DrawerLayout.LayoutParams) mNavigationView.getLayoutParams();
params.width = width;
mNavigationView.setLayoutParams(params);
mFragmentManager = getSupportFragmentManager();
mFragmentTransaction = mFragmentManager.beginTransaction();
mFragmentTransaction.replace(R.id.frame_container, new TabFragment()).commit();
mNavigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(MenuItem menuItem) {
menuItem.setChecked(true);
mDrawerLayout.closeDrawers();
//setTitle(menuItem.getTitle());
if (menuItem.getItemId() == R.id.drawer_home) {
FragmentTransaction fragmentTransaction = mFragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.frame_container, new TabFragment()).commit();
}
if (menuItem.getItemId() == R.id.drawer_facebook){
Toast.makeText(MainActivity.this,
"Replace with your own function", Toast.LENGTH_LONG).show();
}
if (menuItem.getItemId() == R.id.drawer_gPlus){
Toast.makeText(MainActivity.this,
"Replace with your own function", Toast.LENGTH_LONG).show();
}
if (menuItem.getItemId() == R.id.drawer_rate) {
Toast.makeText(MainActivity.this,
"Replace with your own function", Toast.LENGTH_LONG).show();
}
if (menuItem.getItemId() == R.id.drawer_more) {
Toast.makeText(MainActivity.this,
"Replace with your own function", Toast.LENGTH_LONG).show();
}
if (menuItem.getItemId() == R.id.drawer_profile) {
Toast.makeText(MainActivity.this,
"Replace with your own function", Toast.LENGTH_LONG).show();
}
if (menuItem.getItemId() == R.id.drawer_share) {
Toast.makeText(MainActivity.this,
"Replace with your own function", Toast.LENGTH_LONG).show();
}
if (menuItem.getItemId() == R.id.drawer_youtube) {
Toast.makeText(MainActivity.this,
"Replace with your own function", Toast.LENGTH_LONG).show();
}
if (menuItem.getItemId() == R.id.drawer_exit) {
Toast.makeText(MainActivity.this,
"Replace with your own function", Toast.LENGTH_LONG).show();
}
return false;
}
});
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
ActionBarDrawerToggle mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, toolbar, R.string.drawer_open, R.string.drawer_close);
mDrawerLayout.setDrawerListener(mDrawerToggle);
mDrawerToggle.syncState();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem menuItem) {
switch (menuItem.getItemId()) {
case android.R.id.home:
onBackPressed();
return true;
default:
return super.onOptionsItemSelected(menuItem);
}
}
#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 void onStart() {
super.onStart();
// analytics
GoogleAnalytics.getInstance(this).reportActivityStart(this);
} }
TabFragment.java
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.design.widget.TabLayout;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.nav.R;
public class TabFragment extends Fragment {
public static TabLayout tabLayout;
public static ViewPager viewPager;
public static int int_items = 6 ;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.tab_layout, container, false);
tabLayout = (TabLayout) v.findViewById(R.id.tabs);
viewPager = (ViewPager) v.findViewById(R.id.viewpager);
viewPager.setAdapter(new MyAdapter(getChildFragmentManager()));
tabLayout.post(new Runnable() {
#Override
public void run() {
tabLayout.setupWithViewPager(viewPager);
}
});
return v;
}
class MyAdapter extends FragmentPagerAdapter {
public MyAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position)
{
switch (position){
case 0 : return new GoogleFragment();
case 1 : return new SportsFragment();
case 2 : return new GamesFragment();
case 3 : return new PhotographyFragment();
case 4 : return new WildFragment();
case 5 : return new TravelFragment();
}
return null;
}
#Override
public int getCount() {
return int_items;
}
#Override
public CharSequence getPageTitle(int position) {
switch (position){
case 0 :
return getResources().getString(R.string.tab1);
case 1 :
return getResources().getString(R.string.tab2);
case 2 :
return getResources().getString(R.string.tab3);
case 3 :
return getResources().getString(R.string.tab4);
case 4 :
return getResources().getString(R.string.tab5);
case 5 :
return getResources().getString(R.string.tab6);
}
return null;
}
}
}

You can change onBackPressed in the activity:
http://pastebin.com/3DR4nDWM
And in your fragment class:
public boolean goBack()
{
if(webView.canGoBack())
{
webView.goBack();
return true;
}
return false;
}
Try adding ProgressBar on top of the WebView.

Android app webview opens in browser instead of the app

package com.slimolobeapp.slimolobe;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.view.KeyEvent;
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.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import java.net.URL;
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
//initilizing webview
private WebView mywebView;
#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);
mywebView = (WebView) findViewById(R.id.myWebView);
WebSettings webSettings = mywebView.getSettings();
webSettings.setJavaScriptEnabled(true);
mywebView.loadUrl("http://www.slimolobeapp.com");
//force links open in webview
mywebView.setWebViewClient(new MyWebClient());
}
#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_shop) {
mywebView.loadUrl("http://www.slimolobeapp.com/shop");
} else if (id == R.id.nav_category) {
mywebView.loadUrl("http://www.slimolobeapp.com/category");
} else if (id == R.id.nav_price) {
mywebView.loadUrl("http://www.slimolobeapp.com/price");
} else if (id == R.id.nav_contact) {
mywebView.loadUrl("http://www.slimolobeapp.com/contact");
} else if (id == R.id.nav_facebook) {
mywebView.loadUrl("http://www.facebook.com/slimolobe");
} else if (id == R.id.nav_instagram) {
mywebView.loadUrl("http://www.instagram.com/slimolobe");
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
private class MyWebClient extends WebViewClient {
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if (Uri.parse(url).getHost().equals("www.slimolobeapp.com")) {
//open url content in webview
return false;
} else {
//here open external links in external browser or app
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
startActivity(intent);
return true;
}
}
}
//goto previous page when pressing back button
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (event.getAction() == KeyEvent.ACTION_DOWN) {
switch (keyCode) {
case KeyEvent.KEYCODE_BACK:
if (mywebView.canGoBack()) {
mywebView.goBack();
} else {
finish();
}
return true;
}
return super.onKeyDown(keyCode, event);
}
return false;
}
}
Here is my main activity code, I don't know where I am doing it wrong. Every time I open the app, the web view launches a browser, the apps did not load the web page, it only loads in the browser and I don't want this.

I believe you need to set your WebView client before you call loadUrl().

try this code
import android.app.Activity;
import android.os.Bundle;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;
public class Main extends Activity {
private WebView mWebview ;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mWebview = new WebView(this);
mWebview.getSettings().setJavaScriptEnabled(true); // enable javascript
final Activity activity = this;
mWebview.setWebViewClient(new WebViewClient() {
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
Toast.makeText(activity, description, Toast.LENGTH_SHORT).show();
}
});
mWebview .loadUrl("http://www.google.com");
setContentView(mWebview );
}
}

calling a fragment from fragment

I want to call another fragment from the current fragment on the click of the button in the current fragment.
Here is my Mainactivity :
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 com.asd.fragments.RecommendationsFragment;
import com.asd.ibitz4college.fragments.SearchCoachingFragment;
import com.asd.fragments.SearchCollegesFragment;
import com.asd.fragments.MainFragment;
import com.asd.fragments.SearchConsultanciesFragment;
import com.asd.fragments.TrendingFragment;
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);
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);
FragmentManager fm = getFragmentManager();
fm.beginTransaction().replace(R.id.content_frame,new MainFragment()).commit();
}
#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 fm = getFragmentManager();
fm.beginTransaction().replace(R.id.content_frame,new MainFragment()).commit();
if (id == R.id.search_colleges) {
// Handle the Search Colleges action
fm.beginTransaction().replace(R.id.content_frame,new SearchCollegesFragment()).commit();
}
else if (id == R.id.search_consultancies) {
fm.beginTransaction().replace(R.id.content_frame,new SearchConsultanciesFragment()).commit();
}
else if (id == R.id.search_coaching) {
fm.beginTransaction().replace(R.id.content_frame,new SearchCoachingFragment()).commit();
}
else if (id == R.id.my_recommendations) {
fm.beginTransaction().replace(R.id.content_frame, new RecommendationsFragment()).commit();
}
else if (id == R.id.trending) {
fm.beginTransaction().replace(R.id.content_frame, new TrendingFragment()).commit();
} else if (id == R.id.profile) {
} else if (id == R.id.logout) {
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
}
Here is one of my fragment :
import android.app.Fragment;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.asd.k4c.R;
public class SearchCoachingFragment extends Fragment {
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootview = inflater.inflate(R.layout.fragment_search_coaching,container,false);
return rootview;
}
} //Update code formatting
Suppose I want to call resultsfragment from the above fragment on the click
of a button whose id is btn_search, then what should I do?
I tried some already existing answers here, no luck!
P.S: I'm a starter to the world of android dev.

For doing a fragment transaction.Please do the following.
Eg..
A and B are fragments.
Currently A is visible to the User. If you want to do a transaction.
Just create as like below
B b = new B();
((YourActivity)getActivity).setnewFragment(b,true);
public void setNewFragment(Fragment fragment,boolean addbackstack) {
FragmentManager manager = getSupportFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();
transaction.replace(R.id.fragment_content, fragment);
if (addbackstack)
transaction.addToBackStack(title);
transaction.commit();
}

Use an interface to communicate between fragments. For example
public YourFirstFragment extends Fragment {
public interface FragmentCallBack {
void callBack();
}
private FragmentCallBack fragmentCallBack;
public void setFragmentCallBack(FragmentCallBack fragmentCallBack) {
this.fragmentCallBack = fragmentCallBack;
}
private void callThisWhenYouWantToCallTheOtherFragment(){
fragmentCallBack.callBack();
}
}
Then in You activity
private void setCallToFragment{
yourFirstFragment.setFragmentCallBack(new FragmentCallBack(){
void callBack(){
yourSecondFragment.doWhatEver();
}})
}

First you need to create an interface which defines methods that will be used by your fragment to invoke code from the respective activity it is attached to
public interface OnFragmentInteractionlistener {
// the method that you call from your fragment,
// add whatever parameter you need in the implementation of this
// method.
void onClickOfMyView();
}
once you have created the interface, implement it any and all activities that use this fragment.
public class MainActivity extends AppCompatActivity
implements OnMyFragmentInteractionListener {
#Override
public void onClickOfMyView() {
// DO your on click logic here, like starting the transaction
// to add/replace another fragment.
}
}
Then in the onAttach of your fragment to an activity be sure to check if the attaching activity implements this interface, else throw a RunTimeException like so
#Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnMyFragmentInteractionListener) {
mListener = (OnMyFragmentInteractionListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OnMyFragmentInteractionListener");
}
}
Here mListener is a interface reference you hold in your fragment class through which you invoke the onClickOfMyView() method when actually the click happens
Your fragment class where the view's click code is there.
myView.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v) {
mListener.onClickOfMyview();
}
});

You should create some method in your activity. Supposedly it will look like this :
public void startFragment(Fragment fragment) {
fm.beginTransaction().replace(R.id.content_frame,new fragment).commit();
}
As you already done in youronNavigationItemSelected
Then, from your fragment, you can call
((MainActivity)getActivity()).startFragment(new SearchConsultanciesFragment())
for example

Create a method switchFragment in your MainActivity
FragmentTransaction ft;
public void switchFrag() {
try {
ft = getActivity().getFragmentManager().beginTransaction();
ft.replace(R.id.frame_container, new Your_Fragment.class);
ft.commit();
} else {
Log.e("test", "else part fragment ");
}
} catch (Exception e) {
e.printStackTrace();
}
}
Now from your current Fragment you can call this MainActivity's funciton throught the below code:
((MainActivity)getActivity()).switchFrag();
Let me know if this works for you! :)

Develop Reference

The Android operating system is a mobile operating system that was developed by Google (GOOGL?) to be primarily used for touchscreen devices, cell phones, and tablets.

Back button not working in fragments - android

With AppCompatActivity use getSupportFragmentManager() instead of getFragmentManager()

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Android app webview opens in browser instead of the app

calling a fragment from fragment

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