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Faster activity transition

I have created a basic Activity with a WebView. I have added a method in the WebView which loads an error.html page from the asset folder when the WebView receives a HTTP error. I wanted to hide the Share menu item when this error.html page was loaded and so, I moved this to a new Activity.
Now, what's happening is, when there's a connectivity error, the default connectivity error of Android loads first and then the Activity transition takes place. Thus, even though the transition is working fine, users can see the deault Android connectivity error page for a few milliseconds. Is there any way in which I can hide that error page completely as such the users can only see my custom error page.
Here's my MainActivity.java:
package com.ananya.brokenhearts;
import android.annotation.SuppressLint;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.webkit.WebChromeClient;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.Toast;
#SuppressWarnings("deprecation")
public class MainActivity extends AppCompatActivity
{
private WebView WebView;
private ProgressBar ProgressBar;
private LinearLayout LinearLayout;
private String currentURL;
#SuppressLint("SetJavaScriptEnabled")
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
WebView = findViewById(R.id.webView);
ProgressBar = findViewById(R.id.progressBar);
LinearLayout = findViewById(R.id.layout);
ProgressBar.setMax(100);
WebView.loadUrl("https://www.brokenhearts.ml/index.html");
WebView.getSettings().setJavaScriptEnabled(true);
WebView.getSettings().setUserAgentString("Broken Hearts/1.0");
WebView.setWebViewClient(new WebViewClient()
{
#Override
public void onPageStarted(WebView view, String url, Bitmap favicon)
{
LinearLayout.setVisibility(View.VISIBLE);
super.onPageStarted(view, url, favicon);
}
#Override
public void onPageFinished(WebView view, String url)
{
LinearLayout.setVisibility(View.GONE);
super.onPageFinished(view, url);
currentURL = url;
}
#Override
public void onReceivedError(WebView webview, int i, String s, String s1)
{
Intent intent = new Intent(MainActivity.this, ErrorActivity.class);
startActivity(intent);
finish();
}
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url2)
{
if (url2.contains("www.brokenhearts.ml"))
{
view.loadUrl(url2);
return false;
} else
{
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url2));
startActivity(intent);
return true;
}
}
});
WebView.setWebChromeClient(new WebChromeClient()
{
#Override
public void onProgressChanged(WebView view, int newProgress)
{
super.onProgressChanged(view, newProgress);
ProgressBar.setProgress(newProgress);
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu)
{
MenuInflater menuInflater = getMenuInflater();
menuInflater.inflate(R.menu.menu, menu);
return super.onCreateOptionsMenu(menu);
}
#Override
public boolean onOptionsItemSelected(MenuItem item)
{
switch (item.getItemId())
{
case R.id.backward:
onBackPressed();
break;
case R.id.forward:
onForwardPressed();
break;
case R.id.refresh:
WebView.reload();
break;
case R.id.share:
Intent shareIntent = new Intent(Intent.ACTION_SEND);
shareIntent.setType("text/plain");
shareIntent.putExtra(Intent.EXTRA_TEXT,currentURL);
shareIntent.putExtra(Intent.EXTRA_SUBJECT,"Copied URL");
startActivity(Intent.createChooser(shareIntent,"Share URL"));
break;
case R.id.update:
Intent intent = new Intent(MainActivity.this, UpdateActivity.class);
startActivity(intent);
finish();
break;
case R.id.exit:
new AlertDialog.Builder(this,R.style.AlertDialog)
.setIcon(R.drawable.ic_error_black_24dp)
.setTitle("Are you sure you want to exit?")
.setMessage("Tapping 'Yes' will close the app. Tap 'No' to continue using the app")
.setPositiveButton("Yes",
new DialogInterface.OnClickListener()
{
#Override
public void onClick(DialogInterface dialog, int which)
{
finish();
}
})
.setNegativeButton("No", null)
.show();
break;
}
return super.onOptionsItemSelected(item);
}
private void onForwardPressed()
{
if (WebView.canGoForward())
{
WebView.goForward();
} else
{
Toast.makeText(this, "Can't go further", Toast.LENGTH_SHORT).show();
}
}
#Override
public void onBackPressed ()
{
if (WebView.canGoBack())
{
WebView.goBack();
} else
{
new AlertDialog.Builder(this,R.style.AlertDialog)
.setIcon(R.drawable.ic_error_black_24dp)
.setTitle("Are you sure you want to exit?")
.setMessage("Tapping 'Yes' will close the app. Tap 'No' to continue using the app")
.setPositiveButton("Yes",
new DialogInterface.OnClickListener()
{
#Override
public void onClick(DialogInterface dialog, int which)
{
finish();
}
})
.setNegativeButton("No", null)
.show();
}
}
}
Prior to this, I was directly loading the error.html page in the MainActivity itself when there was an error and thus, the default error page wasn't visible. But, I wanted to hide the Share button when error.html page was loaded. I didn't know how to do and I didn't get any response to that question where I had posted it. Thus, I thought of creating a seperate Activity to load the error.html which can let me hide the Share menu icon.
Also, I've tried to add the WebView.loadUrl("file:///android_asset/error.html"); in the same method before that intent hoping that it'll load before the Activity transition, however, that didn't help. I can still see the default Android connectivity error page.
Just to clarify, this is the default error page that I'm talking about: https://i.stack.imgur.com/bMMHh.png
and there's a custom one that I've made that I'm displaying now in the ErrorActivity.java.
What can I do about this?

Hide the webview when an error occured.
#Override
public void onReceivedError(WebView webview, int i, String s, String s1)
{
WebView.setVisibility(View.GONE);**hide the webview when an error occured**
Intent intent = new Intent(MainActivity.this, ErrorActivity.class);
startActivity(intent);
finish();
}

Regarding hiding the share menu icon, you could always use onPrepareOptionsMenu() to hide your share menu if there is any error flag.
#Override
public boolean onPrepareOptionsMenu(Menu menu) {
super.onPrepareOptionsMenu(menu);
menu.findItem(R.id.share).setVisible(!isPageError);
return true;
}
which would require you to have a isPageError boolean set to true in your
#Override
public void onReceivedError(WebView webview, int i, String s, String s1{
isPageError = true;
}

android app, Java - Overflow Menu Error and it's not displaying in the action bar

I did not expect an error to come up but the 3-dot ActionBar menu is not displaying and I am getting an unexpected error. I am not sure where I went wrong in my code.
Please help,
thanks in advance!
MainActivity.java
package com.example.it5.foothillers;
import android.app.Activity;
import android.content.Intent;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
Button button;
Button button2;
Button button3;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Display app icon in the ActionBar
ActionBar actionBar = getSupportActionBar();
actionBar.setDisplayShowHomeEnabled(true);
actionBar.setIcon(R.mipmap.ic_launcher);
button = (Button) findViewById(R.id.button);
button.setOnClickListener(this);
button2 = (Button) findViewById(R.id.button2);
button2.setOnClickListener(this);
button3 = (Button) findViewById(R.id.button3);
button3.setOnClickListener(this);
}
private void buttonClick() {
startActivity(new Intent("it5.foothillers.news"));
}
private void button2Click() {
startActivity(new Intent("it5.foothillers.sports"));
}
private void button3Click() {
startActivity(new Intent("it5.foothillers.events"));
}
#Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.button:
buttonClick();
break;
case R.id.button2:
button2Click();
break;
case R.id.button3:
button3Click();
break;
}
}
#Override
public void onPause() {
super.onPause();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
}
#Override
public boolean onCreateOptionsMenu(MenuItem item) {
int id = item.getItemId();
}
}

You have 3 onCreateOptionsMenu methods. Remove the last 2, you only need the first one with inflater. Also, Override the onOptionsItemSelected method to control the actions.

GetExtra PutExtra

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

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

Null pointer exception when getting extra from intent?

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity {
int count = 0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button abButton = (Button) findViewById(R.id.button1);
final TextView changelingtext = (TextView) findViewById(R.id.changeling);
abButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Toast.makeText(getBaseContext(), "Buttons are working baby", Toast.LENGTH_LONG).show();
count++;
String a = Integer.toString(count);
changelingtext.setText(a);
gotonextpage(v);
}
});
}
public void gotonextpage(View view){
Intent intent = new Intent(this, SecondpageActivity.class);
startActivity(intent);
intent.putExtra("count", count);
//finish(); if you want to end this page
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
First class is above, second class is below
package com.example.collegematch;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class SecondpageActivity extends Activity {
int values;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.secondpage);
Intent intent = getIntent();
values = intent.getExtras().getInt("count");
Button exitButton = (Button) findViewById(R.id.exit);
Button textbutton = (Button) findViewById(R.id.coolbutton);
TextView texty = (TextView) findViewById(R.id.cooltext);
textbutton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Toast.makeText(getBaseContext(), Integer.toString(values), Toast.LENGTH_LONG).show();
System.out.println(values);
}
});
exitButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Toast.makeText(getBaseContext(), "Seeya", Toast.LENGTH_LONG).show();
finish();
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.secondpage, menu);
return true;
}
}
In the mainActivity, everytime button abButton is pressed, it increases the count variable by 1. It also creates a new intent and sends that variable via extra to that intent.
In the second activity, the "values" variable getting the data from the intent is giving me a null pointer exception. Why?

Intent intent = new Intent(this, SecondpageActivity.class);
startActivity(intent);
intent.putExtra("count", count);
Change to
Intent intent = new Intent(this, SecondpageActivity.class);
intent.putExtra("count", count);
startActivity(intent);
You are setting the extra after you've already started the 2nd activity

just alter these two code lines,
Intent intent = new Intent(this, SecondpageActivity.class);
intent.putExtra("count", count);
startActivity(intent);
Your SecondActivity Intent start before setting the extra count to it.

Trouble loading random image on button press

What i'm trying to do is just simply have the button load an image at random. However, the button doesn't seem to be working. When i first load the activity there it works fine and there is a random image....But when i press the button it's not loading another like i need it to. Any idea what i have wrong here? It looks fine to me :/
package com.my.package;
import java.util.Random;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View.OnClickListener;
public class Randomimage extends Activity implements OnClickListener{
private Integer [] mImageIds = {
R.drawable.one,
R.drawable.two,
R.drawable.three,
};
private static final Random rgenerator = new Random();
private ImageView iv;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Integer q = mImageIds[rgenerator.nextInt(mImageIds.length)];
iv = (ImageView) findViewById(R.id.imageviewyeah);
iv.setImageResource(q);
View nextButton = findViewById(R.id.next_image_button);
nextButton.setOnClickListener(this);
}
#Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.next_image_button:
iv.setImageResource(rgenerator.nextInt(mImageIds.length));
break;
}
}
#Override
public boolean onCreateOptionsMenu (Menu menu) {
super.onCreateOptionsMenu(menu);
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu3, menu);
return true;
}
#Override
public boolean onOptionsItemSelected (MenuItem item) {
switch (item.getItemId()) {
case R.id.menu:
startActivity(new Intent(this, Main.class));
return true;
case R.id.startnhie:
startActivity(new Intent(this, startnhie.class));
return true;
}
return false;
}
}

In your button press handling code, change
iv.setImageResource(rgenerator.nextInt(mImageIds.length));
to
iv.setImageResource(mImageIds[rgenerator.nextInt(mImageIds.length)]);