I'm developing an app that uses google maps, but for some reason it crashed every time I try to call the constructor code from the map class.
main
[HIGH]import android.app.Activity;
import android.os.Bundle;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
[Code] ......
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I'm posting this to share the lessons I learned while working with IntentService. IntentService has a single constructor that takes a string argument "name". The documentation has no description of what name is used for. In looking at the sources, I found that its only use is in naming the worker thread for the IntentService. This thread is named IntentService [name].
I initially implemented the constructor of the derived class to also take a String argument and passed it along to the derived class. This is wrong. This will cause the startService() call to generated a java.lang.InstantiationException in the application containing the service i.e. you don't get the exception in the application calling startService(). A clue to the actual problem is a little further up in the logs:"newInstance failed: no <init>()"
The derived class must have a Default constructor and that constructor must call super() passing a string for the name component of the worker thread name.
public class MyIntentService extends IntentService {
public MyIntentService() { super("MyIntentService");
} @Override
protected void onHandleIntent(Intent intent) {
// Handle events on worker thread here }
I'm trying to create class with generics that will have ability to serialize its state using Parcelable interface.
The problem is that class has to contain constructor with single parameter - Parcel, but in my case I need to create class with additional parameters.
Besides, Parcelable.Creator doesn't allow to use generics.
Here is an example:
public class Sample<T> { ...
public Sample(Context ctx, SomeInterface iface, Parcel parcel) {...}
...}
What is the best practice to do it?
I had come across a code snippet which calls for an activity without referring to any context. Before, i was considering that context is used to tell about the calling component. But as i came see that another component can be called without any reference to context, it makes me wonder what purpose it might be serving. please put some light on it.
Here is the code which calls for an activity without referring to 'context'
CODE:............................
I have just started android. I just want to know that how can i call activity class from other java class. i just want to pass class object to activity class.
public class GsonParser extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
MagazineThread thread=new MagazineThread();
thread.start();
}
public GsonParser(JsonMagazineParser Obj)
{
}
}
and i am just doing like from other class. GsonParser obj=new GsonParser(this);passing obj to activity class.how can i achieve that.
Anyone else having the newest Google maps crash out all the time?
Edit: I have a G1
I've a very simple / minimal code application.
I'm drawing some lines on screen with my finger.
At some point, app closes itself / exists automatically.
No exception is thrown.
CODE:......................
I'm unable to find information about this and unable to find a fix. Every sms my wife or I send gets this error.
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I apparently need to implement :
private void writeObject(java.io.ObjectOutputStream out) throws IOException
private void readObject(java.io.ObjectInputStream in) throws IOException, ClassNotFoundException
Anyone know what I should do in these function ?? How should I write my Bitmap variable ?Any code examples ? anyone did it ?
I have a huge codebase. I am not very clear about its design as documents are rear to find.
Is there any tool available to construct the class diagram from the code? I need to know the interactions between the classes and relations between them. If there is any such tool where i can give the entire code as input and get the class diagram as out put, it will be best for my understanding.
The code in the main class works perfekt but i need a other thread but there the code won't work code...
The method create(Context, int) in the type MediaPlayer is not applicable for the arguments (Alarm, int)
and
The method getSystemService(String) is undefined for the type Alarm
I want to look at the source code for the ListAdapter class without downloading the entire Android source code tree. Is there a way to do that?
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View 2 Replies View Relatedi hav two classes...both classes are extends activity.. i need call other class method on main class on android development..its urgent..please.. i done something like subclass sub = new subclass()...its not work..
In 1st activity class
package org.me.intent_testing;
import android.app.Activity; import android.os.Bundle; import android.widget.; import android.view.; import android.content.Intent;
/** * * @author pavankumar */
public class FirstActivity extends Activity {................
I had a bunch of code in an activity that displays a running graph of some external data. As the activity code was getting kind of cluttered, I decided to extract this code and create a GraphView class:
public class GraphView extends LinearLayout {
public GraphView(Context context, AttributeSet attrs) {
super(context, attrs);
LayoutInflater inflater = (LayoutInflater)
context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
inflater.inflate(R.layout.graph_view, this, true);
}
public void start() {
// Perform initialization (bindings, timers, etc) here
}
public void stop() {
// Unbind, destroy timers, } }
Moving stuff into this new LinearLayout-derived class was simple. But there was some lifecycle management code associated with creating and destroying timers and event listeners used by this graph (I didn't want this thing polling in the background if the activity was paused, for example). Coming from a MS Windows background, I kind of expected to find overridable onCreate() and onDestroy() methods or something similar, but I haven't found anything of the sort in LinearLayout (or any of its inherited members). Having to leave all of this initialization code in the Activity, and then having to pass it into the view seemed like it defeated the original purpose of encapsulating all of this code into a reusable view. I ended up adding two additional public methods to my view: start() and stop(). I make these calls from the activity's onResume() and onPause() methods respectively. This seems to work, but it feels like I'm using duct tape here. Does anyone know how this is typically done?
I am trying to create HTTP connection using AsyncTask class.
Is it possible to create HTTP connection ?
Can you suggest sample source code?
I set a toggle breakpoint at line 36 of the main class, of APIDemos 8, the debug begins at the OnCreate but never processes another line in the class. Why is that?
Here's the code starting a line 36. Code...
Problem: I have one app that let's you lock the device using Device Administration. One of my users had some conflicts with my app and another. He then removed Device Administration and uninstalled my app, rebooted his phone, and now he cannot access his phone.
He of course cannot use my app to change the password now (since it's uninstalled).
His phone is stock 2.2 LG Optimus V, Virgin Mobile, Rooted.
Question:I'm needing to find a way that my user can now change his lock code.
I need:
1.) to know an internal class (from com.android.internal) that I could use within an app to change the lock code (just like the system settings do).
2.) to know a command I can use with adb shell to remove or change the phone lock code.
3.) to know the location of the file that stores the lock code information.
You need a reference to the class that contains the method you want to call. To access the method homepage() inside the eSkyGuide from the class Weather, you need an instance of the eSkyGuide class inside the instance of the Weather class.
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View 1 Replies View RelatedI wrote successfully TTS with some references in Activity.
However, I want to call this TTS in my own class as below.
CODE:............
I am a beginner in Android Developing. Can any1 please guide me how to call a Method of a class kept under other package. Like class A in Package 1 calls a method in Class B of Package 2 which returns An array or object. Do i have to create an Intent for that? actually i have to gather all information in 1 class from different classes kept under different packages.
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View 3 Replies View RelatedMaking a simple app for my android.
in my xml interface there is a text box in which the user will input a number (for example: 10). the id of this text box is "input1"
how do I call the value of input1 in Java and then perform a calculation on it?
For example...
suppose input1 = x
x + 5 or x*2
and for that matter, how do I have the resulting value appear as constantly updated text output in a specified place on the UI?
I am writing a basic game engine and have an abstract class that represents any object that can be drawn in the 3D world, however inside this class is an abstract method Render() which I would like called automatically by the engine on each draw phase.
How could I implement this so that every class extending from my abstract class will automatically have Render() called? I am using java, android sdk 2.2, and opengl es