Develop Reference

Activity crashes because of Intent with ACTION_SEND

I have an Intent to share a image from an view. It works, but once I canceled it to upload it on Instagram and I received an exception.
Google didn't help...
Intent
if(!getStringName().equals(" ")) {//check if it is usefull
LinearLayout table=(LinearLayout) findViewById(R.id.table_linear);
table.setDrawingCacheEnabled(true);
Bitmap bitmap = table.getDrawingCache();
String imagepath=saveBitmap(bitmap);
//sv.setDrawingCacheEnabled(false);
Intent shareImage=new Intent();
shareImage.setAction(Intent.ACTION_SEND);
shareImage.setType("image/png");
shareImage.putExtra(Intent.EXTRA_SUBJECT, getString(R.string.app_name));
shareImage.putExtra(Intent.EXTRA_TEXT, getStringName());
shareImage.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(new File(imagepath)));
startActivity(shareImage);
//new RalaAlertToast(context, getString(R.string.share_success), false);
}else {
//show message, that it's not useful
}
Stack Trace
java.lang.RuntimeException: Unable to start activity ComponentInfo{at.ralaweb.ralaprogramme.subnetztabelle/at.ralaweb.ralaprogramme.subnetztabelle.ActivityMain}: java.lang.RuntimeException: Parcel android.os.Parcel#41f7d760: Unmarshalling unknown type code 2131558402 at offset 200
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2227)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2276)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1205)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5146)
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:796)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:612)
at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:132)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.RuntimeException: Parcel android.os.Parcel#41f7d760: Unmarshalling unknown type code 2131558402 at offset 200
at android.os.Parcel.readValue(Parcel.java:2080)
at android.os.Parcel.readSparseArrayInternal(Parcel.java:2363)
at android.os.Parcel.readSparseArray(Parcel.java:1735)
at android.os.Parcel.readValue(Parcel.java:2070)
at android.os.Parcel.readArrayMapInternal(Parcel.java:2314)
at android.os.Bundle.unparcel(Bundle.java:249)
at android.os.Bundle.getSparseParcelableArray(Bundle.java:1273)
at com.android.internal.policy.impl.PhoneWindow.restoreHierarchyState(PhoneWindow.java:1794)
at android.app.Activity.onRestoreInstanceState(Activity.java:948)
at android.app.Activity.performRestoreInstanceState(Activity.java:920)
at android.app.Instrumentation.callActivityOnRestoreInstanceState(Instrumentation.java:1138)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
... 12 more
another thing: should I disable the drawing cache after the export?

Button to set different activity colour

I am trying to set the background colour of a different activity from the activity main but I am getting a null pointer.
This is the main:
View activity;
activity = findViewById(R.layout.activity_connect_four);
The button:
Button highScoreButton1 = (Button) findViewById(R.id.bgc);
highScoreButton1.setOnClickListener(new OnClickListener() {
public void onClick (View v) {
// null pointer on below line
activity.findViewById(android.R.id.content)
.setBackgroundColor(Color.BLACK);
}
});
The logcat:
FATAL EXCEPTION: main
java.lang.NullPointerException
at com.example.con4.MainActivity$4.onClick(MainActivity.java:80)
at android.view.View.performClick(View.java:4240)
at android.view.View$PerformClick.run(View.java:17721)
at android.os.Handler.handleCallback(Handler.java:730)
at android.os.Handler.dispatchMessage(Handler.java:92)
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)
Where the logCat is pointing to, I don't know what to change. Any help I would be grateful

You're receiving a NPE because that activity and view is not inflated, therefore it returns as null. The way you're setting the background color is flawed by nature. By setting it as you are, even without the NPE, you're storing a setting in the memory of the device. The moment that the device kills your activity, you'll lose that information. As an alternative, you need to store this setting on the device for later retrieval. For what you're attempting to do, I would recommend using SharedPreferences.
In your settings Activity:
Button highScoreButton1 = (Button) findViewById(R.id.bgc);
SharedPreferences prefs = getSharedPreferences(PREF_NAME, Context.MODE_PRIVATE);
highScoreButton1.setOnClickListener(new OnClickListener() {
public void onClick (View v) {
prefs.edit().putInt(BACKGROUND_COLOR, Color.BLACK).commit();
}
});
BACKGROUND_COLOR is a key variable that could be set to "background_color". Then when you start you other activity:
SharedPreferences prefs = getSharedPreferences(PREF_NAME, Context.MODE_PRIVATE);
int color = prefs.getInt(BACKGROUND_COLOR, Color.WHITE);
And use that color to set the background. Using this method, the background color will be saved to the device until it gets overridden (settings change) or the app is uninstalled.
If you want this to be the background of all of your activity, I suggest having all activities extending a base activity and implementing that code there.
You can check out other storage methods here: http://developer.android.com/guide/topics/data/data-storage.html

Refreshing ListView from Custom Adapter Class - Android

I want to refresh data in ListFragment from my custom adapter class, but got the error NullPointerException.
This is Adaper class method:
b1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
BasketFragment basketFragment = new BasketFragment();
basketFragment.getBsketList();
}
});
And when I call it in my Fragment class I get java.lang.NullPointerException at mDataBase = dbHelper.getWritableDatabase();
getBasketList():
public void refreshList() {
dbAdaper.setArrayMyData(selectAll());
dbAdaper.notifyDataSetChanged();
}
And here is the part where I got the error:
public ArrayList<BasketData> selectAll() {
Cursor mCursor = null;
dbHelper = new DBHelper(getActivity());
mDataBase = dbHelper.getWritableDatabase();//NullPointerException
mCursor = mDataBase.query("orderTable", null, null, null, null, null, null);
LogCat:
java.lang.NullPointerException
at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:224)
at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:164)
at com.epon.fragments.BasketFragment.selectAll(BasketFragment.java:100)
at com.epon.fragments.BasketFragment.getBsketList(BasketFragment.java:142)
at com.epon.adapters.DBBasketAdapter$2.onClick(DBBasketAdapter.java:177)
at android.view.View.performClick(View.java:4240)
at android.view.View$PerformClick.run(View.java:17721)
at android.os.Handler.handleCallback(Handler.java:730)
at android.os.Handler.dispatchMessage(Handler.java:92)
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)

Have you set the context right?
Android: NullPointerException on getWritableDatabase()
NullPointerException on getWritableDatabase()
I think that his is your problem a problem.
Maybe if this is not helping posting the content of getActivity() might be helpful?
edit
Your logcat makes me keep thinking that its a context error!

java.lang.NullPointerException:com.google.android.gms.maps.GoogleMap.moveCamera

I am currently working on the new Google Maps Android API v2.
My MapActivity class is working with my Samsung galaxy s3 ans s2 with the code below:
However, there are some particular devices are not working such as: GT-S5830i
class MapActivity extends FragmentActivity implements OnMapClickListener, OnMapLongClickListener, OnMarkerClickListener
{
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_map);
tvLocInfo = (TextView)findViewById(R.id.locinfo);
android.support.v4.app.FragmentManager myFragmentManager = getSupportFragmentManager();
SupportMapFragment myMapFragment = (SupportMapFragment)myFragmentManager.findFragmentById(R.id.map);
myMap = myMapFragment.getMap();
myMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
ArrayList<Cooridnates> cooridnatesList = MainActivity.getList();
for(int i=0;i<cooridnatesList.size();i++)
{
//Toast.makeText(MapActivity.this, "SIZE : " + " " + cooridnatesList.size(), Toast.LENGTH_LONG).show();
LatLng point = new LatLng(cooridnatesList.get(i).getLat(),cooridnatesList.get(i).getLon());
tvLocInfo.setText("markers added");
myMap.addMarker(new MarkerOptions().position(point).title(point.toString()));
center=CameraUpdateFactory.newLatLng(point);
}
CameraUpdate zoom=CameraUpdateFactory.zoomTo(16);
myMap.moveCamera(center);
myMap.animateCamera(zoom);
myMap.setOnMapClickListener(this);
myMap.setOnMarkerClickListener(this);
markerClicked = false;
}
For some reason, I am getting this error:
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.coldice.plotfinder/com.coldice.plotfinder.MapActivity}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1651)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667)
at android.app.ActivityThread.access$1500(ActivityThread.java:117)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:130)
at android.app.ActivityThread.main(ActivityThread.java:3687)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at com.google.android.gms.maps.GoogleMap.moveCamera(Unknown Source)
at com.coldice.plotfinder.MapActivity.onCreate(MapActivity.java:70)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1615)
... 11 more

You function MainActivity.getList() probably returned an empty list, so for loop doesn't execute center=CameraUpdateFactory.newLatLng(point);.

it seems center is null in this >> myMap.moveCamera(center);, make an appropriate check on this variable before passing it in moveCamera method.

It seems problem is here. center might have null value, So to get proper explanation debug your application.
center is initialzed here.
center=CameraUpdateFactory.newLatLng(point);
It might assign null in center.
myMap.moveCamera(center); <<<PROBLEM is here
if(center != null )
myMap.moveCamera(center);

Simple SharedPreferences in Android

I'm having a problem, and I already tried everything I found on this site, it's not helping, so I'm asking this question myself.
my code is:
public class MyActivity extends Activity{
protected PositionSense positionSense;
protected Preferences preferences;
String IP;
String ID;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
positionSense = new PositionSense(this, null);
SharedPreferences settings = getSharedPreferences("preferences", 0);
IP = settings.getString("ip", "http://192.168.1.3:8080/servlet");
ID = settings.getString("id", "USER");
}
Later on, I use these variables in a background running thread that contacts the servlet and sends some info (including position and ID of the user which is saved in preferences)
I'm not posting all of that because I don't want to clog up the thread more than necessary (but if it is needed, I will post it all)
In any case, it doesn't work and it gives me the following error log:
09-14 16:47:20.854: WARN/dalvikvm(552): threadid=1: thread exiting with uncaught exception (group=0x409c01f8)
09-14 16:47:20.884: ERROR/AndroidRuntime(552): FATAL EXCEPTION: main
java.lang.IllegalStateException: Could not execute method of the activity
at android.view.View$1.onClick(View.java:3044)
at android.view.View.performClick(View.java:3511)
at android.view.View$PerformClick.run(View.java:14105)
at android.os.Handler.handleCallback(Handler.java:605)
at android.os.Handler.dispatchMessage(Handler.java:92)
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: 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:3039)
... 11 more
Caused by: java.lang.NullPointerException
at com.moodswings.MoodSwingsActivity.clickHappy(MoodSwingsActivity.java:94)
... 14 more
I don't know what to do about it.
Can someone give me the SIMPLEST possible way to save 2 strings in preferences in one activity that are used in some other activity within the same application? It's supposed to be really simple, but I simply cannot make it work, and I'm nearing my deadline.
Thanks!

To save to shared preferences you can try:
String ip = "192.168.1.1";
SharedPreferences prefs = getSharedPreferences("IP", Context.MODE_PRIVATE);
prefs.edit().putString("Sample IP", ip).commit();
To get the information from the shared preferences you can try:
String newIP = prefs.getString("Sample IP");//You can also place a default value if needed; to bypass the null character.
Now to pass them into activities you can try doing an intent call like below
**Activity One
Intent intent = new Intent(getApplicationContext(),SecondActivity.class);
intent.putExtra("IP",newIp);
startActivity(intent);
**Activity Two
Bundle extras = intent.getExtras();
String tmp = extras.getString("IP");
Also you can use this link to reference.