Develop Reference

RuntimeException: "Number of sync samples doesn't match the number of stills" while making video from images using mp4parser

I want to create a video from multiple images using mp4parser. And I found answer from this link : https://github.com/sannies/mp4parser/issues/182
I have tried it using below code.
DataSource videoFile = new FileDataSourceImpl(new File(Environment.getExternalStorageDirectory() + File.separator + "myvideo.mp4"));
Movie sor = MovieCreator.build(videoFile);
List<Track> videoTracks = sor.getTracks();
Track referenceTrack = null;
for (Track candidate : sor.getTracks()) {
if (candidate.getSyncSamples() != null && "vide".equals(candidate.getHandler()) && candidate.getSyncSamples().length > 0) {
referenceTrack = candidate;
OneJpegPerIframe oneJpegPerIframe = null;
try {
oneJpegPerIframe = new OneJpegPerIframe("eng", arr,referenceTrack);
} catch (IOException e) {
e.printStackTrace();
}
Movie movie = new Movie();
movie.addTrack(oneJpegPerIframe);
Container out = new DefaultMp4Builder().build(movie);
FileOutputStream fos = null;
try {
fos = new FileOutputStream(new File(Environment.getExternalStorageDirectory() + File.separator + "output.mp4"));
out.writeContainer(fos.getChannel());
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
But I got error like "java.lang.RuntimeException: Number of sync samples doesn't match the number of stills (30 vs. 4)" which I have shown below :
E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=100, result=-1, data=Intent { (has extras) }} to activity {orafox.videomaker/orafox.videomaker.activity.MainActivity}: java.lang.RuntimeException: Number of sync samples doesn't match the number of stills (30 vs. 4)
at android.app.ActivityThread.deliverResults(ActivityThread.java:3367)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:3410)
at android.app.ActivityThread.access$1100(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1304)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5103)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.RuntimeException: Number of sync samples doesn't match the number of stills (30 vs. 4)
at com.googlecode.mp4parser.authoring.tracks.mjpeg.OneJpegPerIframe.<init>(OneJpegPerIframe.java:39)
at activity.MainActivity.onActivityResult(MainActivity.java:135)
at android.app.Activity.dispatchActivityResult(Activity.java:5322)
at android.app.ActivityThread.deliverResults(ActivityThread.java:3363)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:3410) 
at android.app.ActivityThread.access$1100(ActivityThread.java:141) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1304) 
at android.os.Handler.dispatchMessage(Handler.java:99) 
at android.os.Looper.loop(Looper.java:137) 
at android.app.ActivityThread.main(ActivityThread.java:5103) 
at java.lang.reflect.Method.invokeNative(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:525) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
at dalvik.system.NativeStart.main(Native Method) 
I do not want to use "ffmpeg" library.
If anybody knew how to solve it please help me. Thanks in advance.

How to rectify this error iin Recyclerview with database

When i am trying to display the contacts in card view when i click on Button it shows fatal exception error it doesnot display cardview anyone can solve this programming with brillliance and another error is it show only one cardview when i click on again the app will be strucked?
Showcontacts.java
public class ShowContacts extends Activity
{
private SQLiteDatabase db;
DbOperations doo;
private List<Contacts> contactsList;
private RecyclerView rv;
private Cursor c;
String names,email,address;
int phone;
String read_query = "select * from"+ ContactsTask.ContactsEntry.TABLE_NAME;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.recycle_layout);
doo = new DbOperations(this);
openDatabase();
rv = (RecyclerView)findViewById(R.id.recyclerview);
initializeData();
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
rv.setLayoutManager(linearLayoutManager);
rv.setHasFixedSize(true);
ContactAdapter cc = new ContactAdapter(contactsList);
rv.setAdapter(cc);
}
public void initializeData() {
contactsList = new ArrayList<>();
c = db.rawQuery(read_query,null);
c.moveToFirst();
while (!c.isLast())
{
names = c.getString(0);
phone = c.getInt(1);
email = c.getString(2);
address = c.getString(3);
contactsList.add(new Contacts(names,phone,email,address));
}
c.isLast();
names = c.getString(0);
phone = c.getInt(1);
email = c.getString(2);
address = c.getString(3);
contactsList.add(new Contacts(names,phone,email,address));
}
private void openDatabase() {
db = openOrCreateDatabase("contactDB", Context.MODE_PRIVATE,null);
}
}
Logacat error
06-28 08:57:43.107 568-568/com.example.anilkumar.contactstask E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.anilkumar.contactstask/com.example.anilkumar.contactstask.ShowContacts}: android.database.sqlite.SQLiteException: near "fromcontacts": syntax error: , while compiling: select * fromcontacts
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
at android.app.ActivityThread.access$600(ActivityThread.java:123)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4424)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.database.sqlite.SQLiteException: near "fromcontacts": syntax error: , while compiling: select * fromcontacts
at android.database.sqlite.SQLiteCompiledSql.native_compile(Native Method)
at android.database.sqlite.SQLiteCompiledSql.<init>(SQLiteCompiledSql.java:68)
at android.database.sqlite.SQLiteProgram.compileSql(SQLiteProgram.java:143)
at android.database.sqlite.SQLiteProgram.compileAndbindAllArgs(SQLiteProgram.java:361)
at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:127)
at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:94)
at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:53)
at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:47)
at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1564)
at android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1538)
at com.example.anilkumar.contactstask.ShowContacts.initializeData(ShowContacts.java:44)
at com.example.anilkumar.contactstask.ShowContacts.onCreate(ShowContacts.java:34)
at android.app.Activity.performCreate(Activity.java:4466)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981) 
at android.app.ActivityThread.access$600(ActivityThread.java:123) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147) 
at android.os.Handler.dispatchMessage(Handler.java:99) 
at android.os.Looper.loop(Looper.java:137) 
at android.app.ActivityThread.main(ActivityThread.java:4424) 
at java.lang.reflect.Method.invokeNative(Native Method) 
Another logact error
06-28 13:14:40.552 11252-11261/com.example.anilkumar.contactstask E/SQLiteDatabase: close() was never explicitly called on database '/data/data/com.example.anilkumar.contactstask/databases/contactDB'
android.database.sqlite.DatabaseObjectNotClosedException: Application did not close the cursor or database object that was opened here
at android.database.sqlite.SQLiteDatabase.<init>(SQLiteDatabase.java:1943)
at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:1007)
at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:986)
at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:962)
at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:1043)
at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:1036)
at android.app.ContextImpl.openOrCreateDatabase(ContextImpl.java:761)
at android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java:215)
at com.example.anilkumar.contactstask.ShowContacts.openDatabase(ShowContacts.java:66)
at com.example.anilkumar.contactstask.ShowContacts.onCreate(ShowContacts.java:33)
at android.app.Activity.performCreate(Activity.java:4466)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
at android.app.ActivityThread.access$600(ActivityThread.java:123)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4424)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)

Just update
String read_query = "select * from"+ ContactsTask.ContactsEntry.TABLE_NAME;
to
String read_query = "select * from "+ ContactsTask.ContactsEntry.TABLE_NAME;
Always close cursor. update your initializeData method
public void initializeData() {
try {
contactsList = new ArrayList<>();
try{
c = db.rawQuery(read_query,null);
c.moveToFirst();
while (!c.isLast())
{
names = c.getString(0);
phone = c.getInt(1);
email = c.getString(2);
address = c.getString(3);
contactsList.add(new Contacts(names,phone,email,address));
}
c.isLast();
names = c.getString(0);
phone = c.getInt(1);
email = c.getString(2);
address = c.getString(3);
contactsList.add(new Contacts(names,phone,email,address));
} catch (Exception e) {
// exception handling
} finally {
if(c != null){
c.close();
}
}
}

convert array by split to integer

I get error :
FATAL EXCEPTION: main at java.lang.Integer.invalidInt
for this block :
int f = Integer.parseInt(c[1]);
limitter.setProgress(f);
limit.setText(f + " A");
MAIN CODE:
byte[] encodedBytes = new byte[readBufferPosition];
System.arraycopy(readBuffer, 0, encodedBytes, 0, encodedBytes.length);
final String data = new String(encodedBytes, "US-ASCII");
readBufferPosition = 0;
handler.post(new Runnable()
{
public void run()
{
String[] c = data.split("limit");
int x = c.length;
if(x>1){
int f = Integer.parseInt(c[1]);
limitter.setProgress(f);
limit.setText(f + " A");
}
What is wrong?
Here is the stack trace:
FATAL EXCEPTION: main
at java.lang.Integer.invalidInt(Integer.java:138)
at java.lang.Integer.parse(Integer.java:375)
at java.lang.Integer.parseInt(Integer.java:366)
at java.lang.Integer.parseInt(Integer.java:332)
at com.tos.hidro.Terminal$2$1.run(Terminal.java:207)
at android.os.Handler.handleCallback(Handler.java:608)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:156)
at android.app.ActivityThread.main(ActivityThread.java:4987)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
at dalvik.system.NativeStart.main(Native Method)

Android Form Validation - How do I prevent a null field from crashing my application on button press?

I have a form which lets the user add entries into a raffle. However if the user leaves one of these fields blank and presses the submit button the app crashes. I tried to get around this by creating an if statement - if any of the fields are null, do nothing. Else, run the intent. However this still does not fix my problem. Pressing the button still causes a crash.
Here is my code:
public void addEntrySubmitButtonClick(View view) {
Intent addEntryIntent = getIntent();
int currentRaffleID = addEntryIntent.getIntExtra("raffleIndexInList", 0);
Raffle currentRaffle = Raffle.raffleArrayList.get(currentRaffleID);
String newEntryForename = String.valueOf(addEntryForename.getText());
String newEntrySurname = String.valueOf(addEntrySurname.getText());
int newEntryTelephoneNo = Integer.parseInt(String.valueOf(addEntryTelephoneNo.getText()));
int newEntryTicketCount = Integer.parseInt(String.valueOf(addEntryTicketCount.getText()));
int newEntryRaffleId = currentRaffle.getId();
if ((newEntryForename.equals(null)) || (newEntrySurname.equals(null)) || (String.valueOf(addEntryTelephoneNo).equals(null)) || (String.valueOf(addEntryTicketCount).equals(null))){
Intent failIntent = new Intent();
} else {
Entry newEntry = new Entry(newEntryForename, newEntrySurname, newEntryTelephoneNo, newEntryTicketCount, newEntryRaffleId);
// Get the list of raffles
for(Raffle currentEntryRaffle : Raffle.raffleArrayList) {
if((currentEntryRaffle.getId() == newEntryRaffleId) && ((currentEntryRaffle.getEntryArrayList().size()) < (currentEntryRaffle.getMaxTickets()))) {
int counter=0;
do {
currentEntryRaffle.getEntryArrayList().add(newEntry);
counter++;
} while(counter < newEntryTicketCount);
}
}
Intent returnIntent = new Intent();
setResult(RESULT_CANCELED, returnIntent);
finish();
}
Here is the logcat:
10-24 10:48:42.599 19481-19481/com.example.rafflemanager E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.IllegalStateException: Could not execute method of the activity
at android.view.View$1.onClick(View.java:3628)
at android.view.View.performClick(View.java:4128)
at android.view.View$PerformClick.run(View.java:17142)
at android.os.Handler.handleCallback(Handler.java:615)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:213)
at android.app.ActivityThread.main(ActivityThread.java:4787)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:809)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:576)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at android.view.View$1.onClick(View.java:3623)
            at android.view.View.performClick(View.java:4128)
            at android.view.View$PerformClick.run(View.java:17142)
            at android.os.Handler.handleCallback(Handler.java:615)
            at android.os.Handler.dispatchMessage(Handler.java:92)
            at android.os.Looper.loop(Looper.java:213)
            at android.app.ActivityThread.main(ActivityThread.java:4787)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:809)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:576)
            at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NumberFormatException: Invalid int: ""
at java.lang.Integer.invalidInt(Integer.java:138)
at java.lang.Integer.parseInt(Integer.java:359)
at java.lang.Integer.parseInt(Integer.java:332)
at com.example.rafflemanager.AddEntry.addEntrySubmitButtonClick(AddEntry.java:48)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at android.view.View$1.onClick(View.java:3623)
            at android.view.View.performClick(View.java:4128)
            at android.view.View$PerformClick.run(View.java:17142)
            at android.os.Handler.handleCallback(Handler.java:615)
            at android.os.Handler.dispatchMessage(Handler.java:92)
            at android.os.Looper.loop(Looper.java:213)
            at android.app.ActivityThread.main(ActivityThread.java:4787)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:809)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:576)
            at dalvik.system.NativeStart.main(Native Method)

newEntryForename.equals(null)
The above expression will either evaluate to false or throw a NullPointerException. It is impossible to call a method on a null reference.
String.valueOf(addEntryTelephoneNo).equals(null)
The above expression will always evaluate to false. From String.valueOf javadoc:
Returns: if the argument is null, then a string equal to "null"; otherwise, the value of obj.toString() is returned.
What you want instead is simply
addEntryTelephoneNo == null
and similar for other cases.
Furthermore note that you are trying to parse the value before you have null-checked it:
int newEntryTelephoneNo = Integer.parseInt(String.valueOf(addEntryTelephoneNo.getText()));
Move that code to after the null check.

I'm writing this from a smartphone so I won't include any codesamples with this answer.
Anyway... First of all remove all String.valueOf() calls - they are redundant. Second, to see if a value is null, check for value == null, not value.equals(null). If value is null, it doesn't have the method equals(), and will thus lead to a NullReferenceException.
Also, don't call Integer.parseInt(value) before you have made sure that value isn't null.

Disabling the send button when the EditText is empty when using imeOption= actionSend
message.addTextChangedListener(new TextWatcher() {
public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
public void onTextChanged(CharSequence s, int start, int before, int count) {}
public void afterTextChanged(Editable s) {
if (s == null || s.length() == 0) {
send.setEnabled(false);
message.setImeOptions(EditorInfo.IME_FLAG_NO_ENTER_ACTION);
}
else {
send.setEnabled(true);
message.setImeOptions( /* whatever you previously had */ );
}
}

To check if a string is empty (null or length 0) use TextUtils.isEmpty(). Here's an example:
int newEntryTelephoneNo;
if (TextUtils.isEmpty(addEntryTelephoneNo.getText())) {
newEntryTelephoneNo = 0;
} else {
newEntryTelephoneNo = Integer.parseInt(addEntryTelephoneNo.getText());
}

The problem in your logcat is this :
Caused by: java.lang.NumberFormatException: Invalid int: ""
Without line numbers, I deduct that the problem comes from one line like this one :
int newEntryTelephoneNo = Integer.parseInt(String.valueOf(addEntryTelephoneNo.getText()));
Reading the following docs give us a hint : http://developer.android.com/reference/java/lang/Integer.html#parseInt(java.lang.String)
Throws
NumberFormatException if string cannot be parsed as an integer value.
The Integer.parseInt() seems not able to parse an empty String to an int (and it's normal, because a int can't be null).
So I think you should make something like that :
int newEntryTelephoneNo = 0;
if (!TextUtils.isEmpty(addEntryTelephoneNo.getText())) {
newEntryTelephoneNo = Integer.parseInt(addEntryTelephoneNo.getText());
}
Not about the main question
Also, as other answers and comment said, you have to use this to check the "nullity" of an object :
myObject == null
instead of
myObject.equals(null)
because you can't even call equals() or any other methods on a null instance.

The logcat clearly shows the exception occurs when the call to Integer.parseInt throws a NumberFormatException. This occurs when the string cannot be converted to an int. If you check the line numbers you will see exactly which conversion generated the exception.
Depending on your needs you probably want to both test for acceptable invalid entries like empty string and catch NumberFormatException due to invalid input so that you can inform the user of the invalid entry.

Here is the code you need:
public void addEntrySubmitButtonClick(View view) {
Intent addEntryIntent = getIntent();
int currentRaffleID = addEntryIntent.getIntExtra("raffleIndexInList", 0);
Raffle currentRaffle = Raffle.raffleArrayList.get(currentRaffleID);
String newEntryForename = String.valueOf(addEntryForename.getText());
String newEntrySurname = String.valueOf(addEntrySurname.getText());
int newEntryTelephoneNo = Integer.parseInt(String.valueOf(addEntryTelephoneNo.getText()));
int newEntryTicketCount = Integer.parseInt(String.valueOf(addEntryTicketCount.getText()));
int newEntryRaffleId = currentRaffle.getId();
if (newEntryForename==null || newEntrySurname == null || String.valueOf(addEntryTelephoneNo) == null || String.valueOf(addEntryTicketCount) == null){
Intent failIntent = new Intent();
} else {
Entry newEntry = new Entry(newEntryForename, newEntrySurname, newEntryTelephoneNo, newEntryTicketCount, newEntryRaffleId);
// Get the list of raffles
for(Raffle currentEntryRaffle : Raffle.raffleArrayList) {
if((currentEntryRaffle.getId() == newEntryRaffleId) && ((currentEntryRaffle.getEntryArrayList().size()) < (currentEntryRaffle.getMaxTickets()))) {
int counter=0;
do {
currentEntryRaffle.getEntryArrayList().add(newEntry);
counter++;
} while(counter < newEntryTicketCount);
}
}
Intent returnIntent = new Intent();
setResult(RESULT_CANCELED, returnIntent);
finish();
}
You have to replace .equals(null) with == null since calling a method on a null pointer will crash your app.

Fatal Error On main Thread

I am receiving this fatal Error, when I try to access one particular function zipIt().
It doesn't matter from where I try to access it I always receive this error. This function simply zips a folder but program don't even go inside this function.
Logcat is displayed below:
Process: com.test.shahid, PID: 14839
java.lang.IllegalStateException: Could not execute method of the activity
at android.view.View$1.onClick(View.java:3823)
at android.view.View.performClick(View.java:4438)
at android.view.View$PerformClick.run(View.java:18422)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5050)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1264)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1080)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at android.view.View$1.onClick(View.java:3818)
            at android.view.View.performClick(View.java:4438)
            at android.view.View$PerformClick.run(View.java:18422)
            at android.os.Handler.handleCallback(Handler.java:733)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5050)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1264)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1080)
            at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at java.io.File.fixSlashes(File.java:185)
at java.io.File.<init>(File.java:134)
at java.io.FileOutputStream.<init>(FileOutputStream.java:128)
at java.io.FileOutputStream.<init>(FileOutputStream.java:117)
at com.test.shahid.MainActivity.zipIt(MainActivity.java:170)
at com.test.shahid.MainActivity.dispatchTakePictureIntent(MainActivity.java:490)
at com.test.shahid.MainActivity.onClickPhoto(MainActivity.java:468)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at android.view.View$1.onClick(View.java:3818)
            at android.view.View.performClick(View.java:4438)
            at android.view.View$PerformClick.run(View.java:18422)
            at android.os.Handler.handleCallback(Handler.java:733)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5050)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1264)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1080)
            at dalvik.system.NativeStart.main(Native Method)
05-23 09:48:22.023 14839-14839/com.test.shahid I/Process﹕ Sending signal. PID: 14839 SIG: 9
Here is the function and variables associated with this function.
private static final File INPUT_FOLDER = Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES);
private static final String ZIPPED_FOLDER = Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES).toString();
protected void zipIt(File inputFolder, String zipFilePath) {
try {
FileOutputStream fileOutputStream = new FileOutputStream(zipFilePath);
ZipOutputStream zipOutputStream = new ZipOutputStream(fileOutputStream);
String myname =inputFolder.toString();
ZipEntry folderZipEntry = new ZipEntry(myname);
zipOutputStream.putNextEntry(folderZipEntry);
File[] contents = inputFolder.listFiles();
for (File f : contents) {
if (f.isFile())
zipFile(f, zipOutputStream);
}
zipOutputStream.closeEntry();
zipOutputStream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
protected void zipFile(File inputFile, ZipOutputStream zipOutputStream) {
try { // A ZipEntry represents a file entry in the zip archive
// We name the ZipEntry after the original file's name
ZipEntry zipEntry = new ZipEntry(inputFile.getName());
zipOutputStream.putNextEntry(zipEntry);
FileInputStream fileInputStream = new FileInputStream(inputFile);
byte[] buf = new byte[1024];
int bytesRead;
// Read the input file by chucks of 1024 bytes
// and write the read bytes to the zip stream
while ((bytesRead = fileInputStream.read(buf)) > 0) {
zipOutputStream.write(buf, 0, bytesRead);
}
// close ZipEntry to store the stream to the file
zipOutputStream.closeEntry();
System.out.println("Regular file :" + inputFile.getCanonicalPath() + " is zipped to archive :" + ZIPPED_FOLDER);
} catch (IOException e) {
e.printStackTrace();
}
}
Well this is from where i am calling this function. I called this function just to check otherwise i have called this function from button and from several other functions. But nothing works.
public void onSync(View v) throws JSONException, IOException {
zipIt(INPUT_FOLDER, ZIPPED_FOLDER);
if (!isConnected()) {
AlertDialog.Builder mBuilder = new Builder(this);
mBuilder.setMessage("Please Enable Wifi to use this service");
mBuilder.setTitle("Enable WIFI");
mBuilder.setCancelable(false);
mBuilder.setPositiveButton("Settings",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
Intent i = new Intent(
Settings.ACTION_WIFI_SETTINGS);
startActivity(i);
}
}
);
mBuilder.setNegativeButton("Cancel",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// This code might cause problem so check when
// device is available
MainActivity.this.finish();
}
}
);
// create alert dialog
AlertDialog alertDialog = mBuilder.create();
// show it
alertDialog.show();
tvIsConnected.setText("You are NOT conncted");
// Intent myIntent = new
// Intent(Settings.ACTION_WIFI_SETTINGS);
// startActivity(myIntent);
return;
}
tvIsConnected.setBackgroundColor(0xFF00CC00);
tvIsConnected.setText("You are conncted");
handler.sendEmptyMessage(MSG_SYNC);
}

NullPointerException
Do you have "WriteExternalStorage" permision in your manifest?
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
Did you check the file path?
Environment.getExternalStorageDirectory() + "/some_foulder/file.txt"