Develop Reference

How to send an Array list to another activity

I want to send a string array list from my MainActivity to Creating activity via using intent. but it gives me some error
I am dealing with it for some time-_-.
This arraylist is for adding some words. I tried putextra(); and putStringArrayListExtra();
MainActivity
Intent intent = new Intent(getApplicationContext(),creating.class);
intent.putStringArrayListExtra("w",Words);
intent.putStringArrayListExtra("m", Meanings);
startActivityForResult(intent,REQUEST_CODE);
CreatingActivity
private ArrayList<String> Words1;
private ArrayList<String> Meanings1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_creating);
Words1 = new ArrayList<String>();
Meanings1 = new ArrayList<String>();
Words1 = intent1.getStringArrayListExtra("w");
Meanings1 = intent1.getStringArrayListExtra("m");
when I click the button to come to this activity, this error appears:
java.lang.NullPointerException: Attempt to invoke virtual method 'java.util.ArrayList android.content.Intent.getStringArrayListExtra(java.lang.String)' on a null object reference

I thing You are missing something it should be like:
Words1 = getIntent().getStringArrayListExtra("w");
Meanings1 = getIntent().getStringArrayListExtra("m");
Right?
And if still you are facing issue try to debug because i think your way is correct.

How to play a specific sound for a Listview item when it is clicked

I am creating an android dictionary app with sounds... I have listview, when an item is selected, a new activity open, inside the new activity contains 4 textviews and an image button, the textviews function perfectly but the image button was not. The audio files are placed in raw folder. How can I put the specific sounds of an item that was clicked?
Here's the code:
MainActivityJava
public class MainActivity extends AppCompatActivity {
ListView lv;
SearchView sv;
String[] tagalog= new String[] {"alaala (png.)","araw (png.)","baliw (png.)","basura (png.)",
"kaibigan (png.)","kakatuwa (pu.)", "kasunduan (png.)","dambuhala (png.)",
"dulo (png.)","gawin (pd.)","guni-guni (png.)","hagdan (png.)","hintay (pd.)",
"idlip (png.)","maganda (pu.)","masarap (pu.)", "matalino (pu.)"};
int[] sounds= new int[]{R.raw.alaala,
R.raw.araw,
R.raw.baliw,
R.raw.basura,
R.raw.kaibigan,
R.raw.kakatuwa,
R.raw.kasunduan,
};
ArrayAdapter<String> adapter;
#TargetApi(Build.VERSION_CODES.HONEYCOMB)
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
lv = (ListView) findViewById(R.id.listView1);
sv = (SearchView) findViewById(R.id.searchView1);
adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,tagalog);
lv.setAdapter(adapter);
lv.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
String tagword =tagalog[position];
String[] definition = getResources().getStringArray(R.array.definition);
final String definitionlabel = definition[position];
String[] cuyuno = getResources().getStringArray(R.array.cuyuno);
final String cuyunodefinition = cuyuno[position];
String[] english = getResources().getStringArray(R.array.english);
final String englishdefinition = english[position];
Intent intent = new Intent(getApplicationContext(), DefinitionActivity.class);
intent.putExtra("tagword", tagword);
intent.putExtra("definitionlabel", definitionlabel);
intent.putExtra("cuyunodefinition",cuyunodefinition);
intent.putExtra("englishdefinition", englishdefinition);
startActivity(intent);
}
});
sv.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
#Override
public boolean onQueryTextSubmit(String text) {
return false;
}
#Override
public boolean onQueryTextChange(String text) {
adapter.getFilter().filter(text);
return false;
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
return super.onCreateOptionsMenu(menu);
}
}
DefinitionActivity.java
public class DefinitionActivity extends AppCompatActivity {
MediaPlayer mp;
String tagalogword;
String worddefinition;
String cuyunoword;
String englishword;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_definition);
TextView wordtv = (TextView) findViewById(R.id.wordtv);
TextView definitiontv = (TextView) findViewById(R.id.definitiontv);
TextView cuyunotv = (TextView) findViewById(R.id.cuyunotv);
TextView englishtv = (TextView) findViewById(R.id.englishtv);
ImageButton playbtn = (ImageButton) findViewById(R.id.playbtn);
final Bundle extras = getIntent().getExtras();
if (extras != null) {
tagalogword = extras.getString("tagword");
wordtv.setText(tagalogword);
worddefinition = extras.getString("definitionlabel");
definitiontv.setText(worddefinition);
cuyunoword = extras.getString("cuyunodefinition");
cuyunotv.setText(cuyunoword);
englishword = extras.getString("englishdefinition");
englishtv.setText(englishword);
}
playbtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
}
});
}

you can pass the raw id in the intent extra and play it on meadiaPlayer

What you want to accomplish is pretty simple.
you can ofcourse pass the id.
But I created this method for your case you can paste it in your activity or class and make a call to it. In my case, I put this method in a class that holds all the common functions, methods, strings, etc. The choice is yours :
public static void playDisSound(Context c, int soundID){
//Play short tune
MediaPlayer mediaPlayer = MediaPlayer.create(c, soundID);
mediaPlayer.setOnCompletionListener( new OnCompletionListener(){
#Override
public void onCompletion( MediaPlayer mp){
mp.release();
}
});
mediaPlayer.start();
}
And this is how to use it in your case :
Example I want to play an audio track from :
int[] sounds= new int[]{R.raw.alaala,
R.raw.araw,
R.raw.baliw,
R.raw.basura,
R.raw.kaibigan,
R.raw.kakatuwa,
R.raw.kasunduan,
};
So I just do :
//TODO ~ pls. remember to define context inside "onCreate" as
//call this before "onCreate"
Context context;
//And do this inside "onCreate" :
context = getApplicationContext();
OR
context = MainActivity.this;
//Then here comes the solution, just make a call to the playDisSound method with the id , in this case the "sounds[postion_referencer_i]"
playDisSound(context, sounds[postion_referencer_i]);
//And now on the question of what your "position_referencer_i" would be .... it also depends on how you intend to pass the id.
Are your going to make a match between the position picked and the position of the sound. It depends on you. But I would have created a set of integers to signify which try I want to play and do a matching simple calculation between the position picked for the item clicked to arrive at the position_referencer_id.
//But simply : note that in your array if I want to play for example "R.raw.baliw" I would just call :
playDisSound(context, R.raw.baliw);
I hope this works perfectly for you. So if I elaborated too much. Do let me know if you may need to stream the sound so I would just paste/send you a very cool method I have been using here in an app am working.
//FINALLY PLS. Remember this : this method would play the sound alright but it wont hesitate to play the sound all over again if you repeat the process. So do remember to check if the sound did play and finished before allowing the user to repeat, if not it could lead to repeated or kind of two speakers playing from the same song but at different time. (And the user may start to think that there is problem with the app. Pls. be very logical and sensitive in using this method)
In solving that, you can disable the button or the UI element that initiates the sound playing until the sound has finished playing, by way of monitoring duration of the track (which I am sure you should know and inculcate into your logic or by simply listening if sound is already playing)
All the best. Era. :)

Android ListView only shows one item at a time

My program is that when a user enteres some information and clicks the "Submit" button, this data will be stored in a separate activity's list View.I have a Shared Preferences incorporated so that the data will be stored. The problem is that only one piece of information gets stored at a time. If I enter a new piece of data, the previous one is overwritten.
public class PreviousPractices extends Activity {
int minutes,hours;
String description;
String date;
ListView practiceList;
ArrayAdapter<String> adapter;
ArrayList<String> listItems = new ArrayList<String>();
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.previous_practices_layout);
practiceList=(ListView)findViewById(R.id.practiceList);
adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1,listItems);
practiceList.setAdapter(adapter);
getIntents();
LoadPreferences();
}
public void getIntents(){
if (getIntent().getExtras() == null) {
}
else {
Bundle extras = getIntent().getExtras();
hours = extras.getInt("Hours");
minutes = extras.getInt("Minutes");
description = extras.getString("Description");
date = extras.getString("dateOfPractice");
adapter.notifyDataSetChanged();
SavePreferences("LISTS", date);
}
}
Right now I'm only working with the date to simplify things. I'm not sure what the issue is, and I'd appreciate some help.

Convert string array to int array android

I'm trying to convert an string array (listview_array) to int array, and then compare numbers. Unfortunately, the app is crashing everytime I execute it.
Here is the code:
public class FindStop3 extends Activity implements OnItemClickListener{
private String stop,line,listview_array[],buschain,dayweek,weekly;
private int selected,day;
private TextView tvLine,tvToday,tvNext;
private ListView lv;
String currentdate = java.text.DateFormat.getDateInstance().format(Calendar.getInstance().getTime());//Get current time
String currenttime = java.text.DateFormat.getTimeInstance().format(Calendar.getInstance().getTime());//Get current time
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_find_stop3);
FindStop3.this.overridePendingTransition(android.R.anim.slide_in_left, android.R.anim.slide_out_right);//Lateral transition
Intent intent = getIntent();//Take data from last activity
Bundle bundle = intent.getExtras();
line=bundle.getString("Line");//Takes the previous selected line from the last activity
stop=bundle.getString("Stop");//Takes the previous selected stop from the last activity
setTitle("Selected stop: "+stop);//Modifies title
getDayOfWeek();//Gets day of week
getBusChain(line,stop,weekly);//Calls method to get the xml chain name
tvLine = (TextView) findViewById(R.id.tvLine);
tvLine.setText("Line from "+line);
tvNext = (TextView) findViewById(R.id.tvNext);
tvNext.setText("Next bus arrives at "+currenttime);
tvToday = (TextView) findViewById(R.id.tvToday);
tvToday.setText(dayweek+","+currentdate+" schedule:");
selected= getResources().getIdentifier(buschain, "array",
this.getPackageName());//Lets me use a variable as stringArray
listview_array = getResources().getStringArray(selected);
lv = (ListView) findViewById(R.id.lvSchedule);
lv.setAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, listview_array));
getNextBus();
}
And here is the method to convert it:
public void getNextBus () {
//Converts listview_array into an integer array
int myar[]=new int[listview_array.length];
for(int i=0;i<listview_array.length;i++){
myar[i]=Integer.parseInt(listview_array[i]);
}
If the method is not executed, the application works perfectly. The values are taken from an xml file as follows:
<string-array name="Schedule">
<item>05:40</item>
<item>06:00</item>
<item>06:16</item>
<item>06:28</item>
<item>06:40</item>
<item>07:16</item>
<item>07:29</item>
<item>07:43</item>
<item>07:55</item>
<item>08:07</item>
<item>08:22</item>
</string-array>
Could anyone gives an idea about what can be the problem?
Thanks.

I think that your problem is when you try to convert the values, because a value like this "05:40" cannot be converted into a int.
Problably, you're getting a NumberFormatException.
If you want a better answer please send the log of your app.

String[] urls won't update correctly

For my class we have to create an application where we catch an SMS message in a broadcast receiver, get the string (assumed to be a URL), add it dynamically to a string-array which is displayed in a fragmentlist. When the list item is clicked we then have to load it into a webview in a fragment.
Everything works until here.
The problem is that the list doesn't update when I try to add the url_act string to it.
Here's my code:
public class UpdateString extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
String url_act = "";
Bundle b = getIntent().getExtras();
url_act = b.getString("url");
UrlListFragment uf = (UrlListFragment) getFragmentManager()
.findFragmentById(R.id.listFragment);
String[] urls = getResources().getStringArray(R.array.urls_array);
List<String> list = new ArrayList<String>();
list = Arrays.asList(urls);
ArrayList<String> arrayList = new ArrayList<String>(list);
arrayList.add(url_act);
urls = arrayList.toArray(new String[list.size()]);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(UpdateString.this,
android.R.layout.simple_list_item_1, urls);
uf.setListAdapter(adapter);
}
If you need more code for context let me know. Updated

You really should post your logcat output just to be sure, as otherwise we don't know what kind of exception was thrown.
That being said, I bet it is a NullPointerException; findFragmentById() is most likely returning null. This is probably because you never inflate your XML resource to begin with.