Android :: Why Is Parcelable Object Null In Receiving Activity?

Aug 16, 2010

I am following the Parcelable example in the Android developer guide with the intention of having a more complex object that I send to different activities. Right now, my class is a wrapper of a String member. If I put the object in the intent and read it back from the Intent it reads as expected, however, on the receiver side, it is always null-pointer.

Android :: Why is parcelable object null in receiving activity?


Android :: Writing Unit Test For Parcelable Object

Feb 6, 2009

I follow the following example in creating a Parcelable object: http://code.google.com/android /reference / android /os / Parcelable .html . Writing unit test for parcelable object

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First Android App And Null Bundle Object

Oct 29, 2012

I've gone through the Notepad Tutorials and they are all working on my virtual device. I am now stuck in the midst of trying to write my own Android app.

My setup:
Windows 7 SP 1 64-bit
Eclipse Indigo Service Release 2
Android Development Tools 16.0.1.v201112150204-238534
Android Virtual Device Platform 2.3.3, API Level 10, CPU/ABI ARM (armeabi)

The app is about as simple as they come - you enter a number, it divides it by another number and displays the result.Here is the code involved:

AndroidManifest.xml:
Code:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.android.driving"
android:versionCode="1"
android:versionName="1.0" >
[code]...

By the time DrivingTimeEstimator's onCreate() method gets executed, the Bundle object (savedInstanceState) is null (which I'm guessing is what leads to mMiles being null, which throws a NullPointerException and kills everything).

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Android :: How Can I Get Current Activity Object In Instrumentation Object?

Sep 9, 2009

I want to do some automated testcase with Instrumentation . Suggest that my AUT has 2 Activity. After clicking the button in ther first Activity, the second one will be shown with new content base on what we enter in the first Activity.) Instrumentation provides us the function called startActivitySync() and return the Activity object for processing. My question is how we can get the pointer of the second Activity after the it is shown by clicking the button on the first activity.?

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Android :: Java - How To Check If Object Is Null

Jan 9, 2010

I am creating an application which retrieves images from the web. In case the image cannot be retrieved another local image should be used.

While trying to execute the following lines:

CODE:................

The line if(drawable.equals(null)) throws an exception if drawable is null.

Does anyone know how should the value of drawable be checked in order not to throw an exception in case it is null and retrieve the local image (execute drawable = getRandomDrawable())?

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Android :: Window.opener - Null - Is Not An Object

Jun 22, 2009

I have a webview with a FriendConnect button to allow a user to login to FriendConnect.

When clicking on this button, I'm taken through the expected screens for logging in.

However, it seems like the last redirect after logging in fails with a Javascript error in the browser:

CODE:...............................

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Android :: ImageView Object Allways Null

Sep 3, 2010

I have a very simple Android activity layout like this:

CODE:..

Now when I (from onOptionsItemSelected) do the following:

CODE:...............

The contents of imgView is allways null!

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Android :: Location Object Passed Into OnLocationChanged Is Null?

Aug 8, 2010

I have an activity that implements LocationListener in my application and my onLocationChanged method has been working perfectly up until recently. For some reason the Location object being passed into the method is null. My question is, why is it null? Does it pass in a null object if it cannot acquire a location?

My GPS is on and I have it set to pull a location from the GPS, and I know my GPS can get a fix on me as I used Maps and had it locate me.

Also, I have the permission for my app set as:

CODE:.................

I don't believe permissions is the issue though, as my activity was working beforehand and I have not altered the permissions since then.

Here is the code that determines the provider of the location object:

CODE:.............

Here is the LogCat output of the error:

CODE:..............

I have tested the same code on another device (an HTC MyTouch 3G to be precise) and it works flawlessly with the GPS, however on my Motorola Droid it crashes.

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Android : Get Activity Object From Intent Object

Sep 21, 2009

I have an Activity that running on system. I can get the Intent that is used to start the activity. But i don't know how to get the Activity object from the Intent object or something else. Can anyone tell me how to do this??? Note that, I don't use Instrumentation object.

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Android : Receiving A Null Pointer Exception When Calling A Cursor In Phone

Mar 18, 2010

I am creating an application which tracks the users location using GPS, stores the longitude and latitude in a database using a content provider then output the first long and lat to a mapview. I am able to create the cursor using this line of code...

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Android :: Searchable Activity's Intent.getAction() Null?

Apr 25, 2010

I've followed the SearchManager documentation yet am still having trouble making one of my app's activities searchable. From my activity, the Search dialog appears, I enter a query, hit search, my activity reopens, then I see this in the log:

CODE:.....................

It appears to me that everything is fine up until the last three lines. The "NI" lines are getIntent().toString(), getIntent().getAction(), and getIntent().hasExtra(SearchManager.QUERY) respectively.

ActivityManager appears to be starting my activity with the correct action. Then when my activity starts, it contains no action!? What am I doing wrong?

The relevant portion of my manifest is:

CODE:..............................

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Android :: Low Memory Cause Activity.getIntent() To Return Null?

Sep 10, 2009

As the title says? Or what situations can cause this method to return null? I would of thought it retained this object always.

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Android :: Set Activity Object To Application?

Apr 26, 2009

When start the activity i will set the activity object to the Application, and i will registry it in the Appication app = MyApplication.getApplication(this);

1. Start Activity A store A id 0x12345678
2. Activity A -> Activity B
3. Store B id 0x87654321
4. Finish B activity
5. but the Activity B object not null in the Application

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Android :: Get KeguardScreenCallback Object In My Own Activity?

May 25, 2009

Is there someone could tell me how to get the KeguardScreenCallback object in my own Activity(For Example,the class of LockScreen,it has a parameter called "callback" in it's constructor,I want to get the "callback" in my activtity).so I can call the goToUnlcokScreen method to remove the screen lock.Or there maybe other way to do this?(I know KeyguardManager,so except this way first.

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Android :: Pass An Object From One Activity To Another?

Aug 28, 2009

I have an activity which implements an OnItemClickListener.code...

However, I need to pass some objects from MyActivity1 to MyActivity2 --

I see there is an Intent.putExtra() for all the basic types, and I even see a Bundle which is a collection of basic types, but how can I pass a generic "Object" to MyActivity2 ?

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Android : How To Pass Object From An Activity To Another

Oct 15, 2009

There is an activity which has an object. This activity(say A) starts another activity(say B). Can B use some object in A?

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Android :: Previous Set Instance Variables Null When Activity Resumed

Apr 20, 2010

I am using an Application object to store app-wide instance data--data that I need to remain in existence for the entire lifetime of the app, so the Application class seems like the proper place to put it. I have just finished reading this thread http://groups.google.com/group/android-developers/browse_thread/threa... that goes into pretty good detail and receives confirmation from Googler hackbod as to how the Application class performs--and from that info it seems this strange behavior I am receiving should not be happening...

Basically, every once in a while when I resume my app in any of its Activities (it is still running in memory so onCreate is not called) I get NullPointerExceptions because instance variables in my Application class are returning null when I request them from my Activity (via a getter method in my custom Application class). It seems as if sometimes Android saves the states of my Activities but deletes all my instance variable data... This can't be an Android problem--there must be something wrong with my code.

Has anyone else ever ran into an issue of this kind? Any ideas as to what may be causing this? I'm not going to post my code here as that won't help anyone, but hopefully someone can point me in some helpful directions.

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Android : Null Pointer Exception When Assigned A View To An Activity

Jul 27, 2010

I have built an activity to handle gestures in my Android game and want it to respond to a gesture anywhere on the screen but I am getting this error on the Log:

CODE:...............

I understand I need to allocate a view to the activity and as you will see in my XML, a view called gestures will serve this purpose but I keep getting Inflation errors when trying to inflate the view. Before when this happened to me it was a misspelling of the view name in the XML but that's not it this time I don't think.

How would I properly assign the 'gesture' view to this activity to prevent the errors?

I have defined my activity in my code like this:

CODE:...............

I have created the activity in the main thread in it's doStart() method by saying:

CODE:............

And my XML layout looks like this:

CODE:...................

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Android :: Get Activity Object While In View Context

Oct 10, 2010

This is a followup to this post: http://stackoverflow.com/questions/3897176/findviewbyid-in-a-subclassed-surfaceview-throwing-runtimeexception Based on Romain Guy's feedback (which I'll accept shortly as it is a solution), I'd like to obtain the calling Activity from within the View, so that I can use it to obtain the desired Text View resource. I don't see any methods in View that return Activity. What is the proper way to do this? Or is there a better alternative for working with TextViews from within another View context. Basically, I am calling setContentView(R.layout.xxx) in onCreate() (as usual), so I don't really have a way to pass in references to additional TextViews unless I awkwardly retrieve the View after setContentView and then make calls on it.

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Android :: How To Pass A Bitmap Object From 1 Activity To Another

Mar 17, 2010

In my activity , I create a Bitmap object, and I need to launch another activity,
How can I pass this Bitmap object from the sub-activity (the one which is going to be launched)?

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Android :: Way To Pass An Object Array To An Activity

Nov 15, 2010

I have read posts on passing arrays from and to activities, but I am confused as to how I would do it for my specific case.

I have an array of objects called DaysWeather (a DaysWeather[] array) where the objects have several String attributes as well as a bitmap attribute. I read somewhere that you have to make it serializable or parceable or something, but it seems messy at first glance.

Could someone lead me in the right direction?

Is there a simple way to do this?

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Android :: Why Return Null When Using FindViewById In Activity To Find And Handle CustomView?

Dec 4, 2009

I wrote CustomView Class, and load it in layout. so i trid to find CustomView using findViewById() in activiy to get handle. but findViewById() was return null.

Written Code is like below:

CODE:.........

MapCanvas.java:

CODE:...............

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Android :: How To Pass An Object To An Activity Via Intent.putExtra?

Aug 7, 2009

I am developing an app that connects to a server. For that connection I created a class Client that maintains info about the connection . My app consists of several Activities and each of that Activity needs access to the Client object to communicate to the server. 1) Can I put somewhere the Client object so that all Acitvities have an access to it? 2) If not I would probably need to pass the object to each Activity via Intent.putExtra(). But putExtra doesn't accept Object as an argument. It only accepts several types like int, long, String etc. So how can I pass an object to another Activity?

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Android :: When Does Activity Object Really Get Killed After Calling Finish()

Nov 5, 2010

I created a thread in my activity, and that thread will print out the value of my instance variables in my activity after running for about 10 seconds. I pressed the back key to destroy my activity before the thread prints out the values, and when the thread reaches that line of code, it can still print out the values correctly. That means even though the activity is finished, the java object of the activity is still there. Will the object always be there? Or it is just waiting to be GCed? Or it will be killed only when Android needs memory?

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Android :: Invoke Changes To A Custom View Object From Its Activity?

Nov 7, 2010

I have a custom view that draws to a canvas. I am trying to invoke changes to the canvas when the user pushes a button from the activity that this view is tied to. Currently, I am attempting to do this by calling a public method, called setNewDrawable, that I created inside the view.

The debugger is giving me different values for the view ID depending on whether I'm inside setNewDrawable or inside the Overridden onDraw method when I post an Invalidate.

For example the debugger variables show: (This - MyView id=830067720176) or (This - MyView id=830067712344) in setNewDrawable and onDraw respectively. This makes me think I basically have two copies of the object and I am essentially interacting with the wrong one.

How can I get information to my custom View in order to determine what it draws?

Here is the code I am running...

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Android :: Getting Error / Pass Activity Object To My New Class?

Mar 26, 2010

I want to show messageBox or notification when connection lost in Static DB class but i cant use getApplicationContext() because its a static class and i tried to call other class called notification but i have error so how i could pass activity object to my new class .

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Android :: Share An Object Between A Running Service And Activity?

Aug 8, 2010

I have an API Object that I made, and I would like to share it between a running Service and various Activities in my app, almost like if I was to make the class static. How could I go about sharing the created object between the two?

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Android : Create A Surface Object Without A Foreground Activity

Jul 6, 2010

I have a function that needs a Surface object to work. I'd like to be able to call that function from a background Service without starting a foreground Activity. Every Surface source in the API that I can see, though, requires a View that's laid out before the Surface becomes available. Are there other ways to create a Surface that I am missing, and can you point me to them?

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Android :: Public Class Preference Extends Activity - Null Pointer Exception

Jun 19, 2010

My app crashes with a null pointer exception on the code below. I have an xml preference file under res/xml/defaults.xml
public class Preference extends Activity {
public Preference() {
} public String getPreference(String key)
{ //it still crashes here
SharedPreferences settings = PreferenceManager.getDefaultSharedPreferences(this.getApplicationContext());
String result = settings.getString(key, null); return result;
} }

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Android :: Cannot Call Method Of View Object Inside Activity

Nov 7, 2010

In my program I have a custom view object. Inside the view class is a method called foo. For some reason when I call foo from my activity, it doesn't fire. Here is the code:

XML of the custom view:
<com.company.application.MyView android:id="@+id/my_view" android:layout_width="wrap_content" android:layout_height="wrap_content" />

The activity code:
public class Main extends Activity { MyView mView;
/** Called when the activity is first created. */
@Override public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState); setContentView(R.layout.main);
LayoutInflater li = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View v = li.inflate(R.layout.main, null); mView= (MyView) v.findViewById(R.id.my_view);
//A button to fire the method inside foo() Button switchLeft = (Button) findViewById(R.id.switch_left); switchLeft.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { callTest(); } } );
} public void callTest() { Log.w(this.getClass().getName(), "clicked left arrow");
mView.foo(); mView.postInvalidate();
} }

Finally here is foo:
public void foo() { mBackground = mContext.getResources().getDrawable(R.drawable.temp_canvas); Log.w(this.getClass().getName(), "background set");
}

The first log is always written when the button is pressed, but the second log is not because foo never fires. What is the deal here? Upon request, the full view

public class MyView extends View { Drawable mBackground; Context mContext;
public MyView (Context context) { super(context); mContext = context;
mBackground = mContext.getResources().getDrawable(R.drawable.leftarrow1);
} public MyView (Context context, AttributeSet attrs) {
super(context, attrs); mContext = context;
mBackground = mContext.getResources().getDrawable(R.drawable.leftarrow1);
} public void foo() { mBackground = mContext.getResources().getDrawable(R.drawable.temp_canvas);
Log.w(this.getClass().getName(), "background set"); }
@Override public void onDraw(Canvas canvas) { Paint paint = new Paint();
paint.setStyle(Paint.Style.FILL); // draw a solid blue circle
paint.setColor(Color.BLUE); canvas.drawCircle(20, 20, 15, paint);
// draw a test background mBackground.setBounds(0, 0, 300, 400);
mBackground.draw(canvas); }
}

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