Android : When / Where To Invoke Overridden Method Of Super Class?

Apr 14, 2010

This question occured to me while programming a Android application, but it seems to be a general programming question more.

The situation is, I am extending (subclass-ing) an class from a library, and overriding a method. how do I know if I should invoke the method of super-class? and when? (in the beginning of the overridden method or in the end?)

For example, I am overriding the method "public boolean onCreateOptionsMenu(Menu menu)" from class "Activity" in Android platform. And I saw someone write "return super.onCreateOptionsMenu(menu)" in the end of the method, in an example. But how do I know it should be done this way? and it is correct or not? what's the difference if I begin my method with "super.onCreateOptionsMenu(menu)"?

Android : When / where to invoke overridden method of super class?


Android :: Created A Method In Another Class But I Can't Use It In OnClick Method From Main Class

Nov 1, 2010

I created a method called insertTable in a class called Table but i can't use it in my onClick method in the main class :

CODE:.......

I want to do a income.insertTable in the onClick method but eclipse say that i need to create a local variable.

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Android : How To Invoke Hide Method?

Aug 23, 2010

I want to judge the call has been connected. So I want to invoke method called isAlive() in the hide abstract class Connection(com.android.internal.telephony)?

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Android :: Method Invoke Problem When Getting Result

Aug 31, 2010

I am try to use reflection to invoke the "List Camera.Parameters.getSupportedFocusModes()" function with the following codes:

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

The log shows it does find the function, however, the result o is always null, why is that?

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Android :: How Local Service Can Invoke A Sync Method On It's Main Activity?

May 2, 2010

I've configured local service under some app i wanna know how could i invoke methods on the activity, through the service in a synchronous way for example the service invoke a method inthe activity and waiting for for result(synchronous) from it.

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Android :: Invoke GetView Method In BaseAdapter In Droid From Another WebService Bean?

Mar 19, 2010

How to invoke the getView method in the baseAdapter in Android from another WebService Bean?

The adapter in my code as follows, I extends the base adapter code...

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Android :: Change Context For FindViewById To Super From Inline Class

Mar 12, 2010

I am trying to get the value of a EditText in a dialog box. A the "*"'ed line in the following code, the safeNameEditText is null; i am assuming because the 'findVeiwById' is searching on the context of the 'AlertDialog.OnClickListener';

How can I get/change the context of that 'findViewById' call?

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

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HTC EVO 4G :: New Super Easy Root Method

Jun 20, 2010

The brilliant minds over at xda have cooked up this 3 step root method...all of the credit goes to them, I'm just posting it.
[Program] Simple Root .1 - 3 Click Root w/ nand unlock!! - xda-developers. Here is the link for the OTA root version
http://forum.xda-developers.com/showthread.php?t=720565

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Android :: Way To Call Another Class Method?

Aug 28, 2009

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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Android :: How To Get Method Of Listactivity From Activity Class?

Apr 19, 2009

Can i call method of Listactivity from Activity class? I have creates Intent object of myListActivity class and called startIntent() from myActivity class.

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Android :: Way To Call A Method Of Class Kept Under Other Package?

Oct 5, 2010

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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Android : How Would You Call A Method From All Instances Of A Class?

Sep 18, 2010

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

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Android :: Class / Method For Getting CDMA Signal Strength?

Nov 3, 2010

Is there any class or method for getting cdma signal strength I got for gsm but not for cdma in android??

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Android : How Can I Call A Bitmap Defined In A Method Of Another Class?

Nov 19, 2010

I want to call a bitmap from a method in my main class and am unsure how to do it - I have a method: Code...

So basically, how can I place the bitmap in my detectFaces method in my main class and pass it as a bitmap on my imageview in my false class?

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Android :: How To Stop Service Method Of Calling Activity Class?

Jul 2, 2010

I am trying to call my service class's stopService() method from my activity. But I don't know how to access stopservice method from my activity class. I have the below code but its not working. This is HomeScreen class:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
enablecheck = (CheckBox)findViewById(R.id.enablecheck);
enablecheck.setOnCheckedChangeListener(new OnCheckedChangeListener(){
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// TODO Auto-generated method stub
if(enablecheck.isChecked()){
startService(new Intent(HomeScreen.this, AutoService.class));
} else {
stopService(new Intent(HomeScreen.this, AutoService.class));
} } });
}
This is Service Class:
public class AutoService extends Service {
private static final String TAG = "AutoService";
private Timer timer;
private TimerTask task;
@Override
public IBinder onBind(Intent intent) {
return null;
} @Override
public void onCreate() {
Toast.makeText(this, "Auto Service Created", Toast.LENGTH_LONG).show();
Log.d(TAG, "onCreate");
int delay = 5000; // delay for 5 sec.
int period = 5000; // repeat every sec.
timer = new Timer();
timer.scheduleAtFixedRate(task = new TimerTask(){
public void run() {
System.out.println("done");
} }, delay, period);
}
@Override
public boolean stopService(Intent name) {
// TODO Auto-generated method stub
timer.cancel();
task.cancel();
return super.stopService(name);
} }

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Android :: Call Non Static Method (Located In Main Class) From Different One

Oct 18, 2010

I've been trying to call a non-static method, located in my main application Class, from the Preferences Class. Because the method I call is not static, I instantiate the main class and then try to call the specific method I want but it's force closing.

Preferences.class (from where I call the method):
Preference sorted = (Preference) findPreference("sortPref");
sorted.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
public boolean onPreferenceChange(Preference preference, Object newValue) {
Object d = new Dmarks();
((Dmarks) d).queryBookmarks();
return true;
}});
the Dmarks.class method I call:
public void queryBookmarks() {
Toast.makeText(context, Toast.LENGTH_LONG).show();
//context is not null and the Toast is working if I call it from Dmarks.class }

The Logcat:
E/AndroidRuntime(11718): FATAL EXCEPTION: main
E/AndroidRuntime(11718): java.lang.NullPointerException
E/AndroidRuntime(11718):
at android.content.ContextWrapper.getContentReso
lver(ContextWrapper.java:90)
E/AndroidRuntime(11718):
at android.app.Activity.managedQuery(Activity.ja
va:1520)
E/AndroidRuntime(11718):
at com.droidil.droidmarks.Dmarks.queryBookmarks(
Dmarks.java:101)
E/AndroidRuntime(11718):
at com.droidil.droidmarks.Preferences$2.onPrefer
enceChange(Preferences.java:47)
E/AndroidRuntime(11718):
at android.preference.Preference.callChangeListe
ner(Preference.java:756)
E/AndroidRuntime(11718):
at android.preference.ListPreference.onDialogClo
sed(ListPreference.java:219)
E/AndroidRuntime(11718):
at android.preference.DialogPreference.onDismiss
(DialogPreference.java:384)
E/AndroidRuntime(11718):
at android.app.Dialog$ListenersHandler.handleMes
sage(Dialog.java:1047)
E/AndroidRuntime(11718):
at android.os.Handler.dispatchMessage(Handler.ja
va:99)
E/AndroidRuntime(11718):
at android.os.Looper.loop(Looper.java:123)
E/AndroidRuntime(11718):
at android.app.ActivityThread.main(ActivityThrea
d.java:4627)
E/AndroidRuntime(11718):
at java.lang.reflect.Method.invokeNative(Native
Method)
E/AndroidRuntime(11718):
at java.lang.reflect.Method.invoke(Method.java:5
21)
E/AndroidRuntime(11718):
at com.android.internal.os.ZygoteInit$MethodAndA
rgsCaller.run(ZygoteInit.java:868)
E/AndroidRuntime(11718):
at com.android.internal.os.ZygoteInit.main(Zygot
eInit.java:626)
E/AndroidRuntime(11718):
at dalvik.system.NativeStart.main(Native Method)
D/dalvikvm(11718): GC_FOR_MALLOC freed 4248 objects / 282248 bytes in 40ms
W/ActivityManager( 244): Force finishing activity com.droidil.droidmarks/.Preferences

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Android :: Sending A String Created Inside A Method To Another Class

Sep 12, 2010

I have code which has one activity which passes information to a second activity.
I can use this information to pass to a third activity with additional information from the result of the second activity.

I want to use gestures as a method of going back to a previous activity, but if I go back from the third to the second activity I need the information initially passed from the first to the second activity to still be present.

i.e.

First Acticity

what is Y?

answer y = 5

Second activity

User said Y = 5

what is X?

Third Activity

User said Y = 5
X = 6

Go back to Second activity but maintain the input of

User said Y = 5.

To do this I have used a bundle to pass the information between activities, but I can only access the info in the bundle from within a method within the class started by the intent.

The gesture controls are within another class, so I cannot access the bundle information from within this class as the getIntent command produces a not defined error.

What I need to do is to be able to pass the information from the bundle from the first activity to the gesture class so that I can pass it back when I go back using the gestures.

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Android : Override A Method Taking A Reflected Class Argument

Sep 22, 2010

Since API 7, PhoneStateListener has a function: void onSignalStrengthsChanged( SignalStrength signalStrength )

Question: how can I override this via reflection so that I can stay backwards compatible with earlier APIs that don't have the SignalStrength class ? If I make the argument an Object, the signature changes of course.

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Android :: Call Method In Main Activity From Custom View Class

Aug 8, 2010

I am using the following method in a new application I'm developing. There is a main activity, which instantiates different classes that extends RelativeLayout and I'm using setContentView to switch between the different modules of the application. I wonder if this is a good approach or necessarily I have to use different activities to the several screens the app haves.

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Android :: Custom Toast - Service Class Does Not Inherit The > FindViewById() Method

May 19, 2010

The problem seems to be that the Service class does not inherit the > findViewById() method.

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Android :: Inside Service Class / Executing Method For Toast From Scheduled TimerTask

Apr 30, 2010

I am trying to execute a {public void} method in Service, from scheduled TimerTask which is periodically executing.This TimerTask periodically checks a condition. If it's true, it calls method via {className}.{methodName};However, as Java requires, the method needs to be {pubic static} method, if I want to use {className} with {.dot}.The problem is this method is for notification using Toast(Android pop-up notification) and Status Bar.But for this to work, the method must not have {static} modifier and resides in Service class.So, basically, I want background Service to evaluate condition from scheduled TimerTask, and execute a method in Service class.Can anyone help me what's the right way to use Service, invoking a method when certain condition is satisfied while looping evaluation?

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General :: How To Hack Webkit Java Class Method

Apr 18, 2012

I try to make android java app that uses webkit browser component but in slight different way. My primary goal is to modify the webkit WebViewCore java class method so my android application uses my own WebView which derived from modified WebViewCore and acts as I wish. The problel is that WebViewCore and entire bunch of related classes is not part of public SDK.

So far I tried:

- replaced android.jar from SDK in my project with "full" version (framework.jar)

- copied entire webkit java classes from Android OS to my project and modified the method as I need.

- included in lib/armeabi the libwebcore.so and libchrome_net.so (these I grabbed from rooted phone which I gonna to use for experiments)

- compiled and created apk file with libs included (in the code java layer calls my own libs using System.loadLibrary(..))

- application crashes on launch on device with:

Code:

04-18 10:39:23.451: D/dalvikvm(8214): Trying to load lib /data/data/com.tester.webtest/lib/libwebcore2.so 0x2bb4a1c8
04-18 10:39:23.511: D/dalvikvm(8214): Added shared lib /data/data/com.tester.webtest/lib/libwebcore2.so 0x2bb4a1c8
04-18 10:39:23.521: D/dalvikvm(8214): Trying to load lib /data/data/com.tester.webtest/lib/libchromium_net2.so 0x2bb4a1c8
04-18 10:39:23.531: D/dalvikvm(8214): Added shared lib /data/data/com.tester.webtest/lib/libchromium_net2.so 0x2bb4a1c8
04-18 10:39:23.541: D/dalvikvm(8214): No JNI_OnLoad found in /data/data/com.tester.webtest/lib/libchromium_net2.so 0x2bb4a1c8,

[code]....

What should I do for making my own independent version of webkit, so I can install it with my application on specific phone without breaking other apps (browsers) behaviour?

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Android :: Accessing Inner Variable From Outer Class Method In Android Activity

Aug 31, 2010

I m doing some task with following code,
I want to access inner class variable from outer class method.
class Outer extends Activity
{private Handler mHandler = new Handler();
StopTheThread()
{mHandler.removeCallbacks(mUpdateTimeTask);//
This is the what I want to do:
} class Inner
{ final Runnable mUpdateTask = new = new Runnable() {
public void run() {
//Some Code Goes Here
} };
InnerClassMethod()
{ mHandler.removeCallbacks(mUpdateTimeTask);//
This statement working fine here. Here mUpdateTask is inner class variable which is not accessible from outer class.

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Android :: Call Non Static Method In Static SQLiteDatabase Class

Mar 30, 2010

i want to display a msg to the user (msg box or Toast) when exception happend in a static SQLite Database class that i use. the problem is that i cant call a non static method in a static class , how can i handle this. this is the class

private static SQLiteDatabase getDatabase(Context aContext) {

and i want to add something like this in the class when exception happen but context generates the problem of reference to non static in static class.

Context context = getApplicationContext();
CharSequence text = "Hello toast!";
int duration = Toast.LENGTH_SHORT;
Toast toast = Toast.makeText(context, text, duration);
toast.show();

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Android :: How To Phone SMS Limit Be Overridden?

Nov 2, 2009

We are developing an election monitoring application that relies on the SMS network to submit reports from independent election observers in the field. The application poses questions to the user, who answers them sequentially, and an SMS is sent each time a question is answered. We currently have around 120 questions (and therefore 120 SMS messages) that need to be sent in a fairly short period of time. However, the limit in the Android source is 100 SMS messages per hour (3600000 milliseconds). How can this limit be overridden, either on a per-application basis or in the Android source?

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Android :: Java Compatibility With GetFields Method In Android Java.lang.Class

Feb 11, 2009

I'm having some problems porting a Java application to work in Android platform. I detected an incompatibility problem between java sun and Adroid sdk in java.lang.Class. I oberved that: public Field[] getFields() Returns an array containing Field objects describing all fields which are defined. That's array is sorted as attributes are declared in the main Class in sun jdk. For example, next Class is defined as: public class Example { public boolean stop; public int atr1; public String name; ....
}

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Android :: How To Have Shared Menu In Each (List) Activity Without Re-writing The Overridden Methods

Jan 5, 2010

I know that Android provides some useful methods to be overridden in order to define a menu:

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

I would like to have this menu shared by each Activity and ListActivity of my Android application. This is for having a standard menu in each (List) Activity that lets the user jump to every part of the application within a click.

Right now, the easiest way to achieve this is to copy-and-paste both methods in every (List) Activity of the application. I don't like this redundancy of code written.

Is sub-classing a reasonable choice? I've already seen that sub-classing one of my ListActivity does not work very well (threads that retrieve objects from a database are giving problems). Are there other ways to share a menu though Activities?

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HTC Droid Eris :: Date And Time Setting Getting Overridden / Why This Is?

May 7, 2010

Under Settings -> Date and Time, whenever I set a Date to a future or past number, it gets overridden by the Network/WiFi. I've made sure that I've unchecked the Automatic option. Anyone have any ideas why this is?

When I turn off my Network(3G) and WiFi, I'm able to set the Date to whatever I want without it getting reset like 2 seconds later.

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HTC EVO 4G :: Contacts Icon And Pictures Keep Getting Overridden By Their Linked Facebook Photo / Fix It?

Jun 17, 2010

My contact photo's/icon's keep getting overridden by their linked Facebook photo.. i set the particular contact to a photo and in a couple of seconds their facebook photo is back as their icon.. any way to keep this from happening.

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General :: RAZR / JB 4.1.2 - Power Toggles Notification Overridden By PowerAMP

Apr 28, 2013

When I play music on my RAZR (JB 4.1.2) via Poweramp, its notification always overrides Power Toggles' one. I mean Poweramp stays on top and then comes PT being the second. The latter has specially designed "notification priority" feature which is set to 5/5, and it works perfectly until I start Poweramp. I have never faced such problem before as I used both applications and they did not interfere with each other.

So is there a way to raise PT's notification priority or drop the Poweramp's one instead? May be some "notification priority manager" or anything...

Tried Notification Toggles app which is similar to PT, but thing was the same, so it's Poweramp issue.

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