Develop Reference

Android Tutorial - Adding Action Bar, duplicate class?

I'm trying to create the Action Bar by following the Android Studio tutorial. I am familiar with VBA, C++, and Python, but this is the first time I've ventured into an App, which uses java, xml, etc. in one. I say that because I think I've misplaced (or misnamed) something in my code, as when I try to run this, I get the error error: duplicate class: com.example.batman.myfirstapp.MyActivity.
I don't understand how it's a duplicate, I only have one "MyActivity.java", so am thinking that I can't do more than one public class MyActivity extends ... per .java file?
Here's what I have (please let me know if I need to include other code):
MyActivity.java
package com.example.batman.myfirstapp;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.EditText;
import android.support.v7.app.*;
public class MyActivity extends ActionBarActivity{
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu items for use in the action bar
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.main_activity_actions, menu);
return super.onCreateOptionsMenu(menu);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle presses on the action bar items
switch (item.getItemId()) {
case R.id.action_search:
// openSearch();
return true;
case R.id.action_settings:
// openSettings();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
}
public class MyActivity extends AppCompatActivity {
public final static String EXTRA_MESSAGE = ".com.batman.myfirstapp.MESSAGE";
/**
* Called when the user clicks the Send button
*/
public void sendMessage(View view) {
Intent intent = new Intent(this, DisplayMessageActivity.class);
EditText editText = (EditText) findViewById(R.id.edit_message);
String message = editText.getText().toString();
intent.putExtra(EXTRA_MESSAGE, message);
startActivity(intent);
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_display_message);
// getSupportActionBar().setDisplayHomeAsUpEnabled(true);
// If your minSdkVersion is 11 or higher, instead use:
getActionBar().setDisplayHomeAsUpEnabled(true);
}
}
main_activity_actions.xml
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:myfirstapp="http://schemas.android.com/apk/res-auto">
<!-- Search, should appear as action button -->
<item android:id="#+id/action_search"
android:icon="#drawable/ic_action_search"
android:title="#string/action_search"
myfirstapp:showAsAction="ifRoom" />
<!-- Settings, should always be in the overflow -->
<item android:id="#+id/action_settings"
android:title="#string/action_settings"
myfirstapp:showAsAction="never" />
</menu>
Again, I'm not sure what other files (strings.xml, DisplayMessageActivity.java, etc.) would be helpful to debug the above, so let me know what else I can include.
Thank you for any advice/help!

You're intuition is correct! You can only have one MyActivity class in your file, here's what it might look like:
public class MyActivity extends ActionBarActivity {
public final static String EXTRA_MESSAGE = ".com.batman.myfirstapp.MESSAGE";
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_display_message);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.main_activity_actions, menu);
return super.onCreateOptionsMenu(menu);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.action_search:
return true;
case R.id.action_settings:
return true;
default:
return super.onOptionsItemSelected(item);
}
}
private void sendMessage(View view) {
Intent intent = new Intent(this, DisplayMessageActivity.class);
EditText editText = (EditText) findViewById(R.id.edit_message);
String message = editText.getText().toString();
intent.putExtra(EXTRA_MESSAGE, message);
startActivity(intent);
}
}

Your assumption is correct. In your .java file you have two classes named MyActivity. You can only have one.

Webview back button won't go back

Please Help
When you press the Back Button to get out of the application
I tried a lot of solutions, but did not succeed
I will put you code
MainActivity
import android.content.Intent;
import android.net.Uri;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.app.Activity;
import android.view.Window;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.TextView;
import android.view.View;
public class MainActivity extends Activity{
WebView webview;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_PROGRESS);
setContentView(R.layout.activity_main);
webview = (WebView) findViewById(R.id.webView);
webview.getSettings().setJavaScriptEnabled(true);
webview.getSettings().setBuiltInZoomControls(false);
webview.getSettings().setLoadWithOverviewMode(true);
webview.getSettings().setUseWideViewPort(true);
webview.loadUrl("http://www.alrofaiy.com/");
webview.setWebChromeClient(new WebChromeClient() {
public void onProgressChanged(WebView view, int progress) {
setProgress(progress * 100);
}
});
webview.setWebViewClient(new InsideWebViewClient());
}
#Override
public void onBackPressed() {
super.onBackPressed();
if(webview.canGoBack()){
webview.goBack();
}
}
private class InsideWebViewClient extends WebViewClient {
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
}
#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.
switch (item.getItemId()){
case R.id.item1:
try {
Intent abb = new Intent(Intent.ACTION_SEND);
abb.setType("text/palin");
abb.putExtra(Intent.EXTRA_SUBJECT , "APP");
String aliwi = "/n /n/n";
aliwi = aliwi + "https:// /n/n";
abb.putExtra(Intent.EXTRA_TEXT, aliwi);
startActivity(Intent.createChooser(abb,""));
}
catch (Exception o)
{o.toString();}
return true;
case R.id.item2:
Intent AAA = new Intent(Intent.ACTION_VIEW, Uri.parse("mailto:info#alrofaiy.com?subhect= "));
startActivity(AAA);
return true;
case R.id.link1:
webview.loadUrl("http://www.alrofaiy.com/login_in");
return true;
}
return super.onOptionsItemSelected(item);
}
}
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="fill_parent"
android:layout_height="match_parent" android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin" tools:context=".MainActivity"
android:padding="0dp">
<WebView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:id="#+id/webView"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:focusableInTouchMode="false"
android:padding="0dp"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_alignParentBottom="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="30dp"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="#string/text_call"
android:id="#+id/textView"
android:layout_alignParentBottom="true"
android:gravity="center"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignRight="#+id/webView"
android:layout_alignEnd="#+id/webView"
android:autoLink="phone"
android:clickable="true"
android:linksClickable="false"
android:textColor="#fff"
android:background="#000"
android:paddingTop="2dp" />
</RelativeLayout>
What's the solution?
When you run the application and view the site does go out when you press the back button

#Override
public void onBackPressed() {
super.onBackPressed();
if(webview.canGoBack()){
webview.goBack();
}
}
Should be
#Override
public void onBackPressed() {
if(webview.canGoBack()){
webview.goBack();
} else {
super.onBackPressed();
}
}

Selecting Menu Items has no effect

I'm creating an app for Android and I wanted to make items in the context menu.
This wasn't a Problem and they were shown. But when I click on them, nothing happens.
I configured the things I needed to configure, but I really am not able to find the Problem. Do you see something? Here my complete code of the Main-Java-Code.
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.webkit.WebView;
public class MainActivity extends Activity{
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
WebView myWebView = (WebView) findViewById(R.id.webView);
myWebView.loadUrl("ABC");}
#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);
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.optionsmenu, menu);
return true;
}
public boolean onOptionsItemSelected(MenuItem about) {
//respond to menu item selection
switch (R.menu.optionsmenu) {
case R.id.about:
startActivity(new Intent(this, SecondActivity.class));
return true;
case R.id.download:
startActivity(new Intent(this, DownloadActivity.class));
return true;
case R.id.impressum:
startActivity(new Intent(this, ImpressumActivity.class));
case R.id.license:
startActivity(new Intent(this, LicenseActivity.class));
}
return false;
}
I want them to Show the Activitys, but nothing happens.
Thanks for your help
Thanks to Phil, the item selection is now working. Here my other codes, the app breaks down every time I select the others.
Here is LicenseActivity:
import android.app.Activity;
import android.os.Bundle;
import android.webkit.WebView;
/**
* Created by Florent on 16.08.13.
*/
public class LicenseActivity extends Activity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
WebView myWebView = (WebView) findViewById(R.id.licenseview);
myWebView.loadUrl("URL");
}
}
Second Activity is only a design activity, the other activitys are the sames as the License Activity.

I see your misstake. You need to get the menuitems Id inside the switch using MenuItem.getItemId(), and return return super.onOptionsItemSelected();:
public boolean onOptionsItemSelected(MenuItem about) {
//respond to menu item selection
switch (about.getItemId()) { // call this here
case R.id.about:
startActivity(new Intent(this, SecondActivity.class));
return true;
case R.id.download:
startActivity(new Intent(this, DownloadActivity.class));
return true;
case R.id.impressum:
startActivity(new Intent(this, ImpressumActivity.class));
case R.id.license:
startActivity(new Intent(this, LicenseActivity.class));
}
return super.onOptionsItemSelected(about); // return this instead of false
}
Also, do not forget to register your Activities inside your Manifest file.
And make sure you are calling setContentView(...) inside your Activity's onCreate() method.
public class LicenseActivity extends Activity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.whateveryourlayoutis); // DONT FORGET THIS
WebView myWebView = (WebView) findViewById(R.id.licenseview);
myWebView.loadUrl("URL");
}
}

Displaying Menu items through webview in android application

I am new to Android application development and still learning. I have created a simple web app using webview and that is working well now I have created a menu in my app and trying to add an about and help and exit item on that. Now I would like them to open inside another webview or the existing webview that I have created. I am confused that should I create another method or a class or another way you prefer
I mean when I will choose about from menu then I will be redirected to a page in my asset folder called about.html and for help it will be help.html .
this is my MainActivity.java
package com.example.mywebapp;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.Window;
import android.webkit.WebView;
import android.webkit.WebViewClient;
public class MainActivity extends Activity {
private WebView mWebView;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().requestFeature(Window.FEATURE_NO_TITLE);
mWebView = new WebView(this);
mWebView.loadUrl("file:///android_asset/index.html");
mWebView.setWebViewClient(new WebViewClient() {
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
});
this.setContentView(mWebView);
}
// For Options Menu
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.main, menu);
return true;
}
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.about:
// Then it should redirect to "file:///android_asset/about.html"
return true;
case R.id.help:
// Then it will be redirect to "file:///android_asset/help.html"
return true;
case R.id.exit:
finish();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
#Override
public boolean onKeyDown(final int keyCode, final KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK) && mWebView.canGoBack()) {
mWebView.goBack();
return true;
}
return super.onKeyDown(keyCode, event);
}
}
And my main.xml from layout folder
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<WebView
android:id="#+id/webView1"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>

Found a solution
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.about:
startActivity(new Intent(this, About.class));
return true;
case R.id.exit:
finish();
return true;
default:
return super.onOptionsItemSelected(item);
}
and then creating a About.class with these code
package com.example.mywebapp;
import android.app.Activity;
import android.os.Bundle;
import android.webkit.WebView;
public class About extends Activity {
private WebView webView;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.about);
webView = (WebView) findViewById(R.id.webView);
//webView.getSettings().setJavaScriptEnabled(true);
//webView.loadUrl("http://www.google.com");
webView.loadUrl("file:///android_asset/about.html");
}
}
and finally in AndroidManifest
<activity
android:name=".About"
android:theme="#android:style/Theme.NoTitleBar" />
i hope this ans would help newbie like me ...

Android Webview: Why Doesn't Refresh Work In Options Menu?

I've been racking my brains over this for ages, but think I'm too close to the woods to see the trees. Can anyone tell me why item1 in the menu below doesn't work to refresh the webview?
(The exit button (item2) works just fine, if that matters.)
package com.my.project;
import android.app.Activity;
import android.os.Bundle;
import android.webkit.WebView;
import android.view.View;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.Window;
public class MyProjectActivity extends Activity
{
final Activity activity = this;
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
getWindow().requestFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main);
WebView WebView = (WebView) findViewById(R.id.webview);
WebView.getSettings().setJavaScriptEnabled(true);
WebView.setScrollBarStyle(View.SCROLLBARS_OUTSIDE_OVERLAY);
WebView.loadUrl("http://www.mydomain.php");
}
// Create Menu Buttons
#Override
public boolean onCreateOptionsMenu(Menu menu)
{
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.options_menu, menu);
return true;
}
// Set Menu Button Actions
#Override
public boolean onOptionsItemSelected(MenuItem item)
{
switch (item.getItemId())
{
case R.id.item1:
reload();
return true;
case R.id.item2:
finish();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
}

try this just minor changes:::
public class MyProjectActivity extends Activity
{
final Activity activity = this;
WebView webView;
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
getWindow().requestFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main);
webView = (WebView) findViewById(R.id.webview);
webView.getSettings().setJavaScriptEnabled(true);
webView.setScrollBarStyle(View.SCROLLBARS_OUTSIDE_OVERLAY);
webView.loadUrl("http://www.mydomain.php");
}
// Create Menu Buttons
#Override
public boolean onCreateOptionsMenu(Menu menu)
{
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.options_menu, menu);
return true;
}
// Set Menu Button Actions
#Override
public boolean onOptionsItemSelected(MenuItem item)
{
switch (item.getItemId())
{
case R.id.item1:
webView.reload();
break;
case R.id.item2:
finish();
break
}
return super.onOptionsItemSelected(item);
}
}