Develop Reference

Android studio's run button does not work [duplicate]

I'm toying with Android Studio making a very simple very stupid app to learn about saving key preferences and I ran into a weird obstacle. I'll try to provide as much as I can since it may be hard to reproduce this bug but honestly both apps I'm running are super basic and there no compile errors.
Specs:
No emulator, I'm running a Samsung Galaxy Tablet. Windows 7, Android Studio 1.2, Gradle 2.2.1.
In the question title, I mean that I have a project named Kitty (pretty much hello world and a button). I click Run->'Run app'->(Dialogue box opens)->OK->Within moments the app launches on my tablet.
^^^THIS IS THE BEAUTIFUL SCREEN I WANT TO SEE ON Sharedpreferences, but it's only on kitty.
Now I started another project called SharedPreferences (gist: two checkboxes ask you "do you like chocolate" and "do you like luigi" and you check one none or both and press save. Two textviews underneath will update to say if you like those things and even later if you reopen the app the textviews will remember Chocolate Luigi preferences). It is just a main_activity.
I don't think I changed any settings or project preferences between the two and neither give me an error. MainActivity.java OUTDATED ORIGINAL SEE EDIT:
package gaga.sharedpreferences;
import android.content.SharedPreferences;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.CheckBox;
import android.widget.CheckedTextView;
import android.widget.TextView;
public class MainActivity extends ActionBarActivity {
public final class setup extends MainActivity {
public void setup () {
//Nothing to see here!
}
// Define the File of Prefs; created if nonexistent
public static final String PREFS_NAME = "MyPrefsFile";
// Start up
#Override
public void onCreate(Bundle state) {
super.onCreate(state);
// Restore preferences on Startup
SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
boolean Chocolate = settings.getBoolean("checkChocolate", false);
boolean Luigi = settings.getBoolean("checkLuigi", false);
// Function set to Whatever
// setSilent(silent);
/* Note:
* CheckedTextView and CheckBox::isChecked()
* CheckBox::setChecked()
* */
CheckBox checkHandleChocolate = (CheckBox) findViewById(R.id.checkChocolate);
CheckBox checkHandleLuigi = (CheckBox) findViewById(R.id.checkLuigi);
// What was the preference? On Start set it to the bool it left off in
checkHandleChocolate.setChecked(Chocolate);
checkHandleLuigi.setChecked(Luigi);
// Change report text on Start
TextView buttonHandleChocolate = (TextView) findViewById(R.id.chocolate);
TextView buttonHandleLuigi = (TextView) findViewById(R.id.luigi);
if(Chocolate)
buttonHandleChocolate.setText("I do prefer Chocolate");
else
buttonHandleChocolate.setText("I do not prefer Chocolate");
if(Luigi)
buttonHandleLuigi.setText("I do prefer Luigi");
else
buttonHandleLuigi.setText("I do not prefer Luigi");
}
public void saveChocolate(Boolean c) {
// All objects from android.context.Context
SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
SharedPreferences.Editor editor = settings.edit();
editor.putBoolean("Chocolate", c);
// Commit the edits
editor.commit();
}
public void saveLuigi(Boolean l) {
// All objects from android.context.Context
SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
SharedPreferences.Editor editor = settings.edit();
editor.putBoolean("Chocolate", l);
// Commit the edits
editor.commit();
}
}
#Override
protected void onStop(){
super.onStop();
// Objects are from android.context.Context
//Normally I'd put the edit commits here, but that's not true
}
// Clicks on Done
public void userDone (View view) {
// View is which widget
boolean checked = ((CheckBox) view).isChecked();
// Which checkbox was clicked
switch(view.getId()) {
case R.id.checkChocolate:
setup instance1 = new setup();
instance1.saveChocolate(checked);
// No break; continue along
case R.id.checkLuigi:
setup instance2 = new setup();
instance2.saveLuigi(checked);
break;
}
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
Red parts of logcat:
06-02 20:49:57.245 25557-25557/? I/SDP.PUB_CRYPTOD﹕ Starting
06-02 20:49:57.245 25557-25557/? I/SDP.PUB_CRYPTOD﹕ Socket created with fd:-1
06-02 20:49:57.245 25557-25557/? E/SDP.PUB_CRYPTOD﹕ Failed to open the netlink socket with error: Protocol not supported
06-02 20:49:57.245 25557-25557/? E/SDP.PUB_CRYPTOD﹕ Exiting
06-02 20:49:59.995 2866-3012/? V/AlarmManager﹕ waitForAlarm result :8
06-02 20:50:02.280 25633-25633/? I/SDP.PUB_CRYPTOD﹕ Starting
06-02 20:50:02.280 25633-25633/? I/SDP.PUB_CRYPTOD﹕ Socket created with fd:-1
06-02 20:50:02.280 25633-25633/? E/SDP.PUB_CRYPTOD﹕ Failed to open the netlink socket with error: Protocol not supported
06-02 20:50:02.280 25633-25633/? E/SDP.PUB_CRYPTOD﹕ Exiting
Thanks for any help. I haven't seen this issue while prowling the internet so it might be excessively noob.
EDIT: Rewritten with the only onCreate in the larger MainActivity class
package gaga.sharedpreferences;
import android.content.SharedPreferences;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.CheckBox;
import android.widget.CheckedTextView;
import android.widget.TextView;
public class MainActivity extends ActionBarActivity {
public final class setup extends MainActivity {
public void setup () {
//Nothing to see here!
}
// Define the File of Prefs; created if nonexistent
public static final String PREFS_NAME = "MyPrefsFile";
// Start up
public void onCreateSubclass() {
// super.onCreate(state);
// Restore preferences on Startup
SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
boolean Chocolate = settings.getBoolean("checkChocolate", false);
boolean Luigi = settings.getBoolean("checkLuigi", false);
// Function set to Whatever
// setSilent(silent);
/* Note:
* CheckedTextView and CheckBox::isChecked()
* CheckBox::setChecked()
* */
CheckBox checkHandleChocolate = (CheckBox) findViewById(R.id.checkChocolate);
CheckBox checkHandleLuigi = (CheckBox) findViewById(R.id.checkLuigi);
// What was the preference? On Start set it to the bool it left off in
checkHandleChocolate.setChecked(Chocolate);
checkHandleLuigi.setChecked(Luigi);
// Change report text on Start
TextView buttonHandleChocolate = (TextView) findViewById(R.id.chocolate);
TextView buttonHandleLuigi = (TextView) findViewById(R.id.luigi);
if(Chocolate)
buttonHandleChocolate.setText("I do prefer Chocolate");
else
buttonHandleChocolate.setText("I do not prefer Chocolate");
if(Luigi)
buttonHandleLuigi.setText("I do prefer Luigi");
else
buttonHandleLuigi.setText("I do not prefer Luigi");
}
public void saveChocolate(Boolean c) {
// All objects from android.context.Context
SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
SharedPreferences.Editor editor = settings.edit();
editor.putBoolean("Chocolate", c);
// Commit the edits
editor.commit();
}
public void saveLuigi(Boolean l) {
// All objects from android.context.Context
SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
SharedPreferences.Editor editor = settings.edit();
editor.putBoolean("Chocolate", l);
// Commit the edits
editor.commit();
}
}
#Override
protected void onStop(){
super.onStop();
// Objects are from android.context.Context
//Normally I'd put the edit commits here, but that's not true
}
// Clicks on Done
public void userDone (View view) {
// View is which widget
boolean checked = ((CheckBox) view).isChecked();
// Which checkbox was clicked
switch(view.getId()) {
case R.id.checkChocolate:
setup instance1 = new setup();
instance1.saveChocolate(checked);
// No break; continue along
case R.id.checkLuigi:
setup instance2 = new setup();
instance2.saveLuigi(checked);
break;
}
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setup startInstance = new setup();
startInstance.onCreateSubclass();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}

In Android Studio you need create a Run Configuration in your project.
Go to this link to left run icon
And click on Edit Configuration, after in the windows configure like this:
And save it, for test click run icon.

It appears that you have two onCreate methods. Try removing the second one and running it again.

Intent from MainActivity options menu to second Activity Error/Android Manifest

I am having a difficult time understanding this error. I have an inent that starts in the Main_Activitie option menu.
I am getting this error in my LogCat:
07-07 20:09:40.317: E/AndroidRuntime(2803): FATAL EXCEPTION: main
07-07 20:09:40.317: E/AndroidRuntime(2803): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.TS.3000/com.TS.3000.AddRestaurantActivity}:java.lang.NullPointerException
When I debug there says there is NPE and No Source Found Window comes up. I've tried add new source folders but not change in error. Here is the section in my main activity that is calling the intent:
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
super.onCreateOptionsMenu(menu);
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.add, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// this handles when user selects add button
Intent addRestaurant = new Intent(MainActivity.this,
AddRestaurantActivity.class);
Log.i("First", "Log.v");
startActivity(addRestaurant);
Log.i("Second", "Log.v");
return super.onOptionsItemSelected(item);
}
*****AddRestaurantActivity****** second activity being called
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.add_restaurant);
Log.i("fourth", "Log.v");
restName = (EditText) findViewById(R.id.edtT_rest_name);
restStreet = (EditText) findViewById(R.id.edtT_restaurant_street_address);
restCity = (EditText) findViewById(R.id.edtT_restaurant_city_address);
phoneNumber = (EditText) findViewById(R.id.edtT_restaurant_phone);
Button saveRestaurant = (Button) findViewById(R.id.btn_saveRestaurant);
saveRestaurant.setOnClickListener(saveRestaurantButtonClicked);
}
OnClickListener saveRestaurantButtonClicked = new OnClickListener() {
String restaurantName = restName.getText().toString();
#Override
public void onClick(View v) {
if (restName.getText().length() != 0) {
Intent intent = new Intent(AddRestaurantActivity.this,
MainActivity.class);
intent.putExtra("restName", restaurantName);
startActivity(intent);
Log.i("fifth", "Log.v");
} else {
AlertDialog.Builder builder = new AlertDialog.Builder(
AddRestaurantActivity.this);
builder.setTitle(R.string.errorTitle);
builder.setMessage(R.string.errorMessage);
builder.setPositiveButton(R.string.errorButton, null);
builder.show();
}
}
};
Here is the XML where I added the intent:
<activity
android:name=".AddRestaurantActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.VIEW" />
<action android:name="android.intent.action.DEFAULT" />
</intent-filter>
</activity>
When I comment out my OnClickListner the intent from the MainActivity to the AddRestaurantActivity operates fine.
I'm not sure if the problem is in declaring my intent in the manifest for the AddRestaurantActivity, or needing to add a source to android.jar. I'm new to android and debugging this problem is difficult. Thanks

Are Main Activity and AddRestaurantActivity in the same package? You could try to change android:name=".AddRestaurantActivity" to full package name, like android:name="com.myapplication.activity.AddRestaurantActivity".

There was protected in a file created automatically what was private

When I make a new Android Application Project
I see the automatic generate MainActivity.java file.
Why was the "OnCreate" protected
I remember this was private. I don't understand. why made this?
For example this:
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
#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;
}
}

It never was private, if it was private then how you were able to Override it?? You might have seen it public because subclass can not reduce the visibility of a method. Read this question for clarification. Why can't you reduce the visibility of a method in a Java subclass?

Refreshing the activities that are present in the back stack

I have a Enter you details option on the action bar as an action item and I am setting that option visible on all activities by extending the below class.
public abstract class ActionActivity extends SherlockActivity {
protected boolean mIsEnterDetailsScreen = true;
protected userName = "";
SessionManager session;
#Override
public boolean onCreateOptionsMenu(Menu menu) {
if(mIsEnterDetailsScreen)
{
menu.add("Enter Your Details")
.setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);
}
else
{
menu.add(userName)
.setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);
}
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
//This uses the imported MenuItem from ActionBarSherlock
switch(item.getItemId())
{
case 0:
Intent intent = new Intent(ActionActivity.this,EnterDetails.class);
startActivity(intent);
return true;
}
return false;
}
#Override
protected void onCreate(Bundle savedInstanceState) {
session = new SessionManager(getApplicationContext());
sessionCheck(); // This method's body is separated for the easiness and pasted below.
super.onCreate(savedInstanceState);
getSupportActionBar().setHomeButtonEnabled(true);
}
}
So, by the above code, if the user enters details, I am saving it in preferences and at the same time setting the mIsEnterDetailsScreen = false; so that this option would be invisible and user name taken from his entered details would be visible. This works fine only for the activities that are started later. But not on the previous activities. So, my doubt is how to refresh the activities that are there in the back stack. So that even when he presses the back button, still the username has to be displayed even in the previous activities after he entered details instead of Enter you details option.
Suppose if user clicks the Enter you details action item on the 3 rd activity, the changes reflect in the later activities(4, 5, 6....), but not on 1st activity and 2nd activity. Is there any way to refresh activities so that the changes persist.
This is the sessionCheck() method in ActionActivity
public void sessionCheck()
{
if(session.isLoggedIn())
{
mIsEnterDetailsScreen = false;
HashMap<String, String> userHashMap = session.getUserDetails();
// name
String name = userHashMap.get(SessionManager.KEY_USER_NAME);
userName = name;
}
else{
mIsEnterDetailsScreen = true;
}
}

When the user enters details, save them somewhere persistent, I would suggest using SharedPreferences. Then override onResume in your Activities that will be in the backstack and load the details (from the SharedPreferences for example) there.
Android does not use an onRefresh method.

You should have to implement the override method onRefresh on the first activity.
While you close come back from Details Activity or you close/finish the Second Activity(that is your Enter Your Details Activity), onRefresh method of the First activity is called. At that time you can set the Value from the SharedPreference. So, that way you can get the Values reflacted on your view.
Hope you got my point.
Feel free for any comments.

How do you turn off share history when using ShareActionProvider?

The new ShareActionProvider available in Android 4.0 (or in earlier versions if you're using ActionBarSherlock) has a feature where the last used item is displayed in the action bar. Is there anyway to turn this off?

For me, the best solution for avoid the history icon is don't use ShareActionProvider, instead of it, create it as any other action:
<item
android:id="#+id/menu_action_share"
android:showAsAction="ifRoom"
android:icon="#drawable/ic_action_share"
android:title="#string/share"/>
at the menu/activity_actions.xml put a item with the ic_action_share icon...
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_actions, menu);
return super.onCreateOptionsMenu(menu);
}
Inflate the menu normally...
private void actionShare(){
Intent i = new Intent(Intent.ACTION_SEND);
i.setType("text/plain");
i.putExtra(Intent.EXTRA_SUBJECT, "my string");
i.putExtra(Intent.EXTRA_TEXT, "another string");
startActivity(i);
//Or like above will always display the chooser
//startActivity(Intent.createChooser(i, getResources().getText(R.string.share)));
}
Create a method with an ACTION_SEND intent
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.menu_item_share:
actionShare();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
And finally call to this method from onOptionsItemSelected
more info ->Sending Simple Data to Other Apps

Start the share activity by yourself:
shareActionProvider.setShareIntent(intent);
shareActionProvider.setOnShareTargetSelectedListener(this);
#Override
public boolean onShareTargetSelected(ShareActionProvider source, Intent intent) {
// start activity ourself to prevent search history
context.startActivity(intent);
return true;
}
Then the ShareActionProvider will not add the chosen activity to the share history.

I created my own version of the ShareActionProvider (and supporting classes), you can copy them into your project (https://gist.github.com/saulpower/10557956). This not only adds the ability to turn off history, but also to filter the apps you would like to share with (if you know the package name).
private final String[] INTENT_FILTER = new String[] {
"com.twitter.android",
"com.facebook.katana"
};
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.journal_entry_menu, menu);
// Set up ShareActionProvider's default share intent
MenuItem shareItem = menu.findItem(R.id.action_share);
if (shareItem instanceof SupportMenuItem) {
mShareActionProvider = new ShareActionProvider(this);
mShareActionProvider.setShareIntent(ShareUtils.share(mJournalEntry));
mShareActionProvider.setIntentFilter(Arrays.asList(INTENT_FILTER));
mShareActionProvider.setShowHistory(false);
((SupportMenuItem) shareItem).setSupportActionProvider(mShareActionProvider);
}
return super.onCreateOptionsMenu(menu);
}

There is no API to do this. However, the class is really simple and you could very easily create your own version of ShareActionProvider that did not keep a history. You would just have to determine the sort order of the possible targets using some other means of ordering (e.g., alphabetically).

Point of clarification: It's not the "last used", it's "most often used", across a sliding window period of time.
If you prefer not to use history, then before creating your views, call
yourShareActionProvider.setShareHistoryFileName(null);
Description of this method, from the official docs (emphasis mine):
Sets the file name of a file for persisting the share history which history will be used for ordering share targets. This file will be used for all view created by onCreateActionView(). Defaults to DEFAULT_SHARE_HISTORY_FILE_NAME. Set to null if share history should not be persisted between sessions.
EDIT: I should clarify — The "most often used" item won't show up if there's no history, so this is currently the only way of removing that button.

Although It's been 2 years ago today but I'd like to share my experience as I made a custom ShareActionProvider class and add this line chooserView.getDataModel().setHistoryMaxSize(0); inside onCreateActionView() which did all the magic for me ! .. I tested it on Lollipop device and on API 16 emulator device and it works perfectly. here is my custom class :
import android.content.Context;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.support.v7.internal.widget.ActivityChooserView;
import android.support.v7.widget.ShareActionProvider;
import android.view.View;
public class MyShareActionProvider extends ShareActionProvider {
/**
* Creates a new instance.
*
* #param context Context for accessing resources.
*/
public MyShareActionProvider(Context context) {
super(context);
}
#Override
public View onCreateActionView() {
ActivityChooserView chooserView = (ActivityChooserView) super.onCreateActionView();
Drawable icon;
if (Build.VERSION.SDK_INT >= 21) {
icon = getContext().getDrawable(R.drawable.share_icon);
}else{
icon = getContext().getResources().getDrawable(R.drawable.share_icon);
}
chooserView.setExpandActivityOverflowButtonDrawable(icon);
chooserView.getDataModel().setHistoryMaxSize(0);
return chooserView;
}
}

add the code like this:
private void addShareSelectedListener() {
if (null == mShareActionProvider) return;
OnShareTargetSelectedListener listener = new OnShareTargetSelectedListener() {
public boolean onShareTargetSelected(ShareActionProvider source, Intent intent) {
mContex.startActivity(intent);
return true;
}
};
//Set to null if share history should not be persisted between sessions.
mShareActionProvider.setShareHistoryFileName(null);
mShareActionProvider.setOnShareTargetSelectedListener(listener);
}

getSupportMenuInflater().inflate(R.menu.share_action_provider, menu);
// Set file with share history to the provider and set the share intent.
MenuItem actionItem = menu.findItem(R.id.menu_item_share_action_provider_action_bar);
ShareActionProvider actionProvider = (ShareActionProvider) actionItem.getActionProvider();
***actionProvider.setShareHistoryFileName(null);
OnShareTargetSelectedListener listener = new OnShareTargetSelectedListener() {
public boolean onShareTargetSelected(ShareActionProvider source, Intent intent) {
startActivity(intent);
return true;
}
};
actionProvider.setOnShareTargetSelectedListener(listener);***