Develop Reference

How to access an options menu item from outside the menu

How can an options menu item be accessed from an object outside of the menu itself? I'm trying to set an alpha value for one of the options menu items, but it's not working for some reason. The commented lines are what I tried.
I've seen the following code used before, but it's not clear on where and how it should be used:
Drawable drawable = item.getIcon();
if (drawable != null) {
drawable.mutate();
drawable.setAlpha(1);
}
Activity class
public class WebviewActivity extends AppCompatActivity {
private static final String TAG = WebviewActivity.class.getSimpleName();
WebView myWebView;
ProgressBar myProgressBar;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_webview);
}
#Override
protected void onStart() {
super.onStart();
setContentView(R.layout.fragment_webview);
String url = getIntent().getStringExtra("url");
myWebView = findViewById(R.id.web_view);
myWebView.setWebViewClient(new WebViewClient());
WebSettings webSettings = myWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
myWebView.loadUrl(url);
myWebView.setWebChromeClient(new WebChromeClient() {
#Override
public void onProgressChanged(WebView view, int newProgress) {
super.onProgressChanged(view, newProgress);
myProgressBar.setProgress(newProgress);
}
});
}
private class WebViewClient extends android.webkit.WebViewClient {
#Override
public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request){
String url=request.getUrl().toString();
view.loadUrl(url);
return true;
}
#Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
}
}
public void onBtnBackPressed() {
if (myWebView.canGoBack()){
myWebView.goBack();
} else {
onBackPressed();
}
}
public void onBtnForwardPressed() {
if (myWebView.canGoForward()){
myWebView.goForward();
} else {
// menu.getItem(R.id.action_webbrowser_forward).setEnabled(false);
// menu.getItem(R.id.action_webbrowser_forward).mutate();
// menu.getItem(R.id.action_webbrowser_forward).setAlpha(1);
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.web_browser, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
else if (item.getItemId() == R.id.action_webbrowser_back) {
onBtnBackPressed();
} else if (item.getItemId() == R.id.action_webbrowser_forward) {
onBtnForwardPressed();
}
return super.onOptionsItemSelected(item);
}
}

Define in your activity class this variable:
MenuItem action_webbrowser_forward;
In onCreateOptionsMenu() after the inflation of the menu, write this:
action_webbrowser_forward = menu.findItem(R.id.action_webbrowser_forward);
then you can use it anywhere in your class:
action_webbrowser_forward.setEnabled(false);
but mutate is used for drawables and not menu items, so get the icon of the item by action_webbrowser_forward.getIcon() and apply mutate to it.

Try passing MenuItem reference on your onBtnForwardPressed function parameters :
#Override
public boolean onOptionsItemSelected(MenuItem item) {
else if (item.getItemId() == R.id.action_webbrowser_back) {
onBtnBackPressed();
} else if (item.getItemId() == R.id.action_webbrowser_forward) {
onBtnForwardPressed(item);
}
return super.onOptionsItemSelected(item);
}
And :
public void onBtnForwardPressed(MenuItem menuItem) {
if (myWebView.canGoForward()){
myWebView.goForward();
} else {
menuItem.setEnabled(false);
menuItem.getIcon().setAlpha(50);
}
}
Hope this helps

Okay I spend couple of hour to get this solution.apparently you can get menuitem from your toolbar. So in my case.
var menuItem = toolbar.menu;
Now to get specfic item from menu item
favIcon = menuItem.findItem(R.id.favourite);
Note: favIcon is MenuItem declare global
Now if you can do whatever you want to do for this icon
eg. to make it invisible
favIcon?.isVisible=false

Prevent WebView from Loading if no internet

I programmed an app which opens a WebView via Imagebutton. If there is no Internet and the app is started a little popup comes up which says "No Internet". If i started the app with Internet and i lost the Internet during using the WebView a very ugly Screen shows up with error. How can i prevent my Webview loading a new side if there is no Internet, a small Toast should open or Textfield with "Sorry you lost your Connection :/", thanks!
Here my Code
public static boolean checkInternetConnection(Context context) {
ConnectivityManager con_manager = (ConnectivityManager)
context.getSystemService(Context.CONNECTIVITY_SERVICE);
if (con_manager.getActiveNetworkInfo() != null
&& con_manager.getActiveNetworkInfo().isAvailable()
&& con_manager.getActiveNetworkInfo().isConnected()) {
return true;
} else {
return false;
}
}
private ImageButton Ilias_link;
private ImageButton Lsf_link;
private WebView mWebView;
#Override
protected void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
AdView mAdView = (AdView) findViewById(R.id.adView);
AdRequest adRequest = new AdRequest.Builder().build();
mAdView.loadAd(adRequest);
if (!MainActivity.checkInternetConnection(this)) {
Toast.makeText(getApplicationContext(), "Du hast leider kein Internet", Toast.LENGTH_SHORT).show();
} else {
Ilias_link = (ImageButton) findViewById(R.id.ilias_link);
mWebView = new WebView(this);
Ilias_link.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
mWebView.getSettings().setJavaScriptEnabled(true);
mWebView.getSettings().setBuiltInZoomControls(true);
mWebView.getSettings().setDisplayZoomControls(false);
mWebView.getSettings().setSupportZoom(true);
if (savedInstanceState == null)
mWebView.loadUrl("https://elearns02.fh-biberach.de/ilias3/login.php?target=&soap_pw=&ext_uid=&cookies=nocookies&client_id=HSBC&lang=de");
mWebView.setWebViewClient(new WebViewClient());
setContentView(mWebView);}
});
Lsf_link = (ImageButton) findViewById(R.id.lsf_link);
mWebView = new WebView(this);
Lsf_link.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
mWebView.getSettings().setJavaScriptEnabled(true);
mWebView.getSettings().setBuiltInZoomControls(true);
mWebView.getSettings().setDisplayZoomControls(false);
mWebView.getSettings().setSupportZoom(true);
if (savedInstanceState == null)
mWebView.loadUrl("https://lsf.fh-biberach.de/qisserver/rds?state=user&type=0");
mWebView.setWebViewClient(new WebViewClient());
setContentView(mWebView);{
}};
})
;}
ImageButton imageButton = (ImageButton)findViewById((R.id.Mensaplan));
imageButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(MainActivity.this, "Comming soon ;)",Toast.LENGTH_LONG).show();
}
});}
public void onPageFinished(WebView view, String url) {
String javascript="javascript:document.getElementsByName('viewport')[0].setAttribute('content', 'initial-scale=1.0,maximum-scale=10.0');";
view.loadUrl(javascript);
}
#Override
protected void onSaveInstanceState(Bundle outState )
{
super.onSaveInstanceState(outState);
mWebView.saveState(outState);
}
#Override
protected void onRestoreInstanceState(Bundle savedInstanceState)
{
super.onRestoreInstanceState(savedInstanceState);
mWebView.restoreState(savedInstanceState);
}
private static final int TIME_INTERVAL = 3000;
private long mBackPressed;
#Override
public void onBackPressed() {
if (mWebView.canGoBack()) {
mWebView.goBack();
return;
} else
{ if (mBackPressed + TIME_INTERVAL > System.currentTimeMillis())
{
super.onBackPressed();
return;
}
else { Toast.makeText(getBaseContext(), "Tap back button in order to exit", Toast.LENGTH_SHORT).show(); }
mBackPressed = System.currentTimeMillis();
}
}
}

Try doing this -
May be it will work. I made a project and used this.
DetectConnection.java
public class DetectConnection {
public static boolean checkInternetConnection(Context context) {
ConnectivityManager con_manager = (ConnectivityManager)
context.getSystemService(Context.CONNECTIVITY_SERVICE);
if (con_manager.getActiveNetworkInfo() != null
&& con_manager.getActiveNetworkInfo().isAvailable()
&& con_manager.getActiveNetworkInfo().isConnected()) {
return true;
} else {
return false;
}
}
}
The main code will be :-
if (!DetectConnection.checkInternetConnection(this)) {
Toast.makeText(getApplicationContext(), "No Internet!", Toast.LENGTH_SHORT).show();
} else {
wv = (WebView) findViewById(R.id.donate_webView1);
c = new CustomWebViewClient();
wv.setWebViewClient(c);
wv.clearCache(true);
wv.clearHistory();
wv.getSettings().setJavaScriptEnabled(true);
wv.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
wv.getSettings().setBuiltInZoomControls(true);
wv.loadUrl("http://www.google.com");
}
// Function to load all URLs in same webview
private class CustomWebViewClient extends WebViewClient {
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if (!DetectConnection.checkInternetConnection(this)) {
Toast.makeText(getApplicationContext(), "No Internet!",Toast.LENGTH_SHORT).show();
} else {
view.loadUrl(url);
}
return true;
}
}
I hope it works :)

android app crash after adding actionbar.setsubtitle

I tried to run my app (from bignerdranch) and could not run it after adding the following code:
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
ActionBar actionBar = getActionBar();
actionBar.setSubtitle("Bodies of Water");
}
I get a runtime exception . If i remove these lines the app runs ok .
ofcourse i added the line #TargetApi(11)
i tried changing my target sdk, i tried copying other people's code. nothing works!!
this is my code :
private void updateQuestion() {
int question = mQuestionBank[mCurrentIndex].getQuestion();
mQuestionTextView.setText(question);
}
private void checkAnswer(boolean userPressedTrue) {
boolean answerIsTrue = mQuestionBank[mCurrentIndex].isTrueQuestion();
int messageResId = 0;
if (mIsCheater[mCurrentIndex]) {
messageResId = R.string.judgment_toast;
} else {
if (userPressedTrue == answerIsTrue) {
messageResId = R.string.correct_toast;
} else {
messageResId = R.string.incorrect_toast;
}
}
Toast.makeText(this, messageResId, Toast.LENGTH_SHORT).show();
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (data == null) {
return;
}
mIsCheater[mCurrentIndex] = data.getBooleanExtra(
CheatActivity.EXTRA_ANSWER_SHOWN, false);
}
#TargetApi(11)
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.d(TAG, "onCreate(Bundle) called");
setContentView(R.layout.activity_quiz);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
ActionBar actionBar = getActionBar();
actionBar.setSubtitle("Bodies of Water");
}
mQuestionTextView = (TextView) findViewById(R.id.question_text_view);
mTrueButton = (Button) findViewById(R.id.true_button);
mTrueButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
checkAnswer(true);
}
});
mFalseButton = (Button) findViewById(R.id.false_button);
mFalseButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
checkAnswer(false);
}
}
);
mNextButton = (Button) findViewById(R.id.next_button);
mNextButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
mCurrentIndex = (mCurrentIndex + 1) % mQuestionBank.length;
// mIsCheater=false;
updateQuestion();
}
});
if (savedInstanceState != null) {
mCurrentIndex = savedInstanceState.getInt(KEY_INDEX, 0);
mIsCheater[mCurrentIndex] = savedInstanceState.getBoolean(CHEATED);
}
mCheatButton = (Button) findViewById(R.id.cheat_button);
mCheatButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent i = new Intent(QuizActivity.this, CheatActivity.class);
boolean answerIsTrue = mQuestionBank[mCurrentIndex]
.isTrueQuestion();
i.putExtra(CheatActivity.EXTRA_ANSWER_IS_TRUE, answerIsTrue);
startActivityForResult(i, 0);
}
});
updateQuestion();
}
#Override
public void onSaveInstanceState(Bundle savedInstanceState) {
super.onSaveInstanceState(savedInstanceState);
Log.i(TAG, "onSaveInstanceState");
savedInstanceState.putInt(KEY_INDEX, mCurrentIndex);
savedInstanceState.putBoolean(CHEATED, mIsCheater[mCurrentIndex]);
}
#Override
public void onStart() {
super.onStart();
Log.d(TAG, "onStart() called");
}
#Override
public void onPause() {
super.onPause();
Log.d(TAG, "onPause() called");
}
#Override
public void onResume() {
super.onResume();
Log.d(TAG, "onResume() called");
}
#Override
public void onStop() {
super.onStop();
Log.d(TAG, "onStop() called");
}
#Override
public void onDestroy() {
super.onDestroy();
Log.d(TAG, "onDestroy() called");
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.quiz, 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();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
`
what could be the problem?
please help me..

I had the same problem with bignerdranch.
It seems that because QuizActivity is a subclass of ActionBarActivity
instead of Activity I have to use getSupportActionBar() instead of
getActionBar()

webview android with progress dialog

im trying to make an webview application for android with progress bar, i tried a lot of examples from here but none was working .. my problem is that on a frame page or a page with facebook likes or comment plugin the progressdialog never stoped .. here is my code.. please test it and tell me what is wrong.
private WebView webview;
private ProgressDialog progressDialog;
boolean loadingFinished = true;
boolean redirect = false;
int nr = 0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
webview = (WebView) findViewById(R.string.webview);
final Activity activity = this;
webview.getSettings().setJavaScriptEnabled(true);
webview.setWebViewClient(new WebViewClient() {
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if (!loadingFinished) {
redirect = true;
}
loadingFinished = false;
webview.loadUrl(url);
return true;
}
public void onLoadResource(WebView view, String url) {
if (progressDialog == null) {
progressDialog = new ProgressDialog(activity);
progressDialog.setTitle("PitziWorld");
progressDialog.setMessage(progressDialog.toString());
progressDialog.setCancelable(isFinishing());
progressDialog.show();
}
loadingFinished = false;
}
public void onPageFinished(WebView view, String url) {
if(!redirect){
loadingFinished = true;
}
if(loadingFinished && !redirect){
if (progressDialog.isShowing() || progressDialog!=null) {
progressDialog.hide();
progressDialog = null;
}
} else{
redirect = false;
}
}
});
webview.loadUrl("http://www.pitziworld.ro");
}
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
WebView webView = (WebView) findViewById(R.string.webview);
//Verifica daca tasta apasata a fost back si daca exista istoric
if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) {
webView.goBack();
return true;
}
// Daca nu a fost tasta back sau nu este istoric, returnam valoare buton
`

this is what you are looking for!
public void onPageStarted(WebView view, String url, Bitmap favicon) {
mProgress.show();
}
to load progress bar in every page
this is it!

How save two webview in SaveInstanceState?

First i will paste my code.
public class ZSEEActivity extends TabActivity {
private WebView webview ;
private WebView webviewtwo;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final Activity activity = this;
TabHost mTabHost = getTabHost();
mTabHost.addTab(mTabHost.newTabSpec("tab_test1").setIndicator("Zastępstwa").setContent(R.id.tab1));
mTabHost.addTab(mTabHost.newTabSpec("tab_test2").setIndicator("Plan Lekcji").setContent(R.id.tab2));
mTabHost.addTab(mTabHost.newTabSpec("tab_test3").setIndicator("O programie").setContent(R.id.tab3));
mTabHost.setCurrentTab(0);
webview = (WebView) findViewById(R.id.webView1);
webviewtwo = (WebView) findViewById(R.id.webView2);
WebSettings webviewtwoSettings = webviewtwo.getSettings();
if (savedInstanceState != null){
webview.restoreState(savedInstanceState);
webviewtwo.restoreState(savedInstanceState);
}
else{
webview.loadUrl("http://zsee.bytom.pl/ogloszenia.php");
webviewtwoSettings.setDefaultFontSize(30);
webviewtwo.loadUrl("http://zsee.bytom.pl/plany/index.html");
}
webview.setWebViewClient(new WebViewClient() {
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
String summary = "<html><body><meta http-equiv=\"Content-Type\" content=\"text/html;charset=utf-8\" ><center>Coś się zepsuło :(</center></body></html>";
webview.loadData(summary, "text/html","utf-8");
Toast.makeText(activity, "O nie! " + description, Toast.LENGTH_SHORT).show();
}
});
webviewtwo.setWebViewClient(new WebViewClient() {
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
String summary = "<html><body><meta http-equiv=\"Content-Type\" content=\"text/html;charset=utf-8\" ><center>Coś się zepsuło :(</center></body></html>";
webviewtwo.loadData(summary, "text/html","utf-8");
Toast.makeText(activity, "O nie! " + description, Toast.LENGTH_SHORT).show();
}
});
}
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.main, menu);
return true;
}
protected void onSaveInstanceState(Bundle outState, Bundle Test) {
webview.saveState(outState);
webviewtwo.saveState(Test);
}
public boolean onOptionsItemSelected(MenuItem item) {
// Handle item selection
switch (item.getItemId()) {
case R.id.item1:
AlertDialog alertdialog= new AlertDialog.Builder(this).create();
alertdialog.setTitle("Pomoc");
alertdialog.setMessage("Lepszy Planer od Sierran'a :>");
alertdialog.show();
return true;
case R.id.item2:
finish();
case R.id.item3:
webview.loadUrl("http://zsee.bytom.pl/ogloszenia.php");
System.out.print("ss");
default:
return super.onOptionsItemSelected(item);
}
}
}
Now is my question. I have two webview widget. One is called webview and another webviewtwo. I'm newbie in android programing so i have problem how save two widgets in onSaveInstanceState and how restore them. Now webviewtwo overwrite webview and in webview windows i have page from webviewtwo. How fix it and do it right ?
Sierran

It's my understanding that onSaveInstanceState should be used to persist any dynamic state information needed to rebuild the application. You wouldn't want to persist the actual widget but rather the information that the widget needs to restore itself.

onSaveInstanceState takes only one Bundle.
Save the webview states into separate Bundles, then put them into the saved one:
Bundle state1=new Bundle();
webview.saveState(state1);
Bundle state2=new Bundle();
webviewtwo.saveState(state2);
outState.putBundle("state1",state1);
outState.putBundle("state2",state2);
super.onSaveInstanceState(outState);
Restoring:
webview.restoreState(savedInstanceState.getBundle("state1"));
webviewtwo.restoreState(savedInstanceState.getBundle("state2"));