I have a Activity and I have a class which extends this Activity. In this subclass I call:
startActivity(new Intent(this, CameraView.class))
Which should start the "CameraView" Activity. However, I always get this error:
CODE:...........
If it makes any difference the subclass creates a ListView and when a row of the ListView is clicked it calls startActivity();
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I have one subclass which extends Dialog class, it seems I can not use startActivity() function to start a new Activity in this subclass which extends Dialog class, how to resolve it?
How to start a new Activity in a Dialog subclass? (In my customized dialog subclass, I have one button, when pressed, I would like to have a new Activity start).
I have subclassed ArrayAdapter to set the color of text to RED if the string does not contain 100%, this has been added to a ListView. The problem is that some of the rows show as red when they contain 100%.
CODE:.....................
I don't think this problem is caused from my ListActivity subclass. I think it has something to do with with my BaseAdapter subclass:
package com.mohit.gtodo;
import com.mohit.gtodo.database.TasksDBAdapter;
import android.content.Context;
import android.database.Cursor;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CheckBox;
import android.widget.CursorAdapter;
import android.widget.TextView;............................
From the documentation for android.app.Application:
"Base class for those who need to maintain global application state"
I am using my own subclass to maintain an object that I'm using to query a server. Also from the documentation:
"onTerminate() Called when the application is stopping."
However, onTerminate() in my class is never called. I press the back button while viewing my main activity, and everything seems to shut down. My main Activity's onDestroy() method is called and isFinishing() returns true, but my android.app.Application's onTerminate() method is never called.
I'm subclassing Android's view class, but whenever I make an instance of the view from another class, the constructor never gets called (or so it seems). I've implemented both public myclass (Context context) and public myclass (Context context, AttributeSet, attrs) I can't figure out what I'm doing wrong. Do I need to override onDraw and onMeasure?
View 1 Replies View RelatedI've found a example on this site on how to make a subclass of the application for android.
I've created this code
package mensand.test;
class TestApp extends android.app.Application { }
Added this line to the manifest
android:name="mensand.test.TestApp"
And when i run the app it's starts with a force close message.
When i remove the line from the manifest all runs ok
I have a ListActivity which is being filled via an internal class "OrderAdapter" - while the list is being populated I set various OnClickListeners on the TextView elements which should open the same view with different parameter values per line. My problem I have is that no matter which entry in the list I click I will always get to a view with the same parameter ID (it's always the ID of the last line in the list) - even though the output of the ID varies if I output it to the TextView.
Here is the code of the internal class which populates the list in the ListActivity:
CODE:.............
Any ideas why it always opens the view with the same ID even though the TextView "tvCheatTitle" displays a different value in every line?
I'm implementing custom widget exdending a View class. But I've found that View's protected field (e.g. mLeft) is not accessible from subClass
View 2 Replies View RelatedI have put some instructions in onLowMemory() callback and want to test the same. Is there a "direct" way to test onLowMemory function of the application subclass?
Or will I have to just overload the phone by starting many apps and doing memory intensive tasks?
I am having a problem with an application I am in the middle of writing which is causing me some serious headaches.
The situation is this:
The application allows the user to configure several different kinds of information in several activities.
One of the activities, which is a subclass of Activity, takes data from the user and stores it in a shared preferences instance that I create manually and edit in code. This activity requires a complex screen layout that I do not believe would work well with a PreferenceActivity, hence me rolling my own in this case.
Another one of the activities, which is a subclass of PreferenceActivity, is a straight forward list of preferences, each with a list options - standard stuff.
I am finding that any data that I store from the first activity, my bespoke preference screen which manually adds the data using a StoredPreferences.Editor instance is overwritten once the user selects an option in my activity that extends PreferenceActivity.
I've run into an early problem with developing for android. I've made my own custom View (which works well). In the beginning i just added it to the layout programmatically, but i figured i could try putting it into the XML layout instead (for consistency).
So what i got is this:
main.xml:
CODE:..........
(Theres obviously more, but you get the point)
Now, this is the stacktrace:
CODE:...........
Why cant i cast my custom view? I need it to be that type since it has a few extra methods in it that i want to access. Should i restructure it and have another class handle the logic, and then just having the view being a view? I'd really like this to work though.
I get a NullPointerException calling a Superclass Method in Subclass Inner Class Constructor... What's the Deal?
In my application's main class (subclass of Application), I have a public inner class that simply contains 3 public string objects. In the parent class I declare an object of that inner class.
CODE:...................
After I instantiate the object in the constructor, I get a runtime error when I try to assign a value in the inner class with a superclass method.
Can you not call superclass methods in the subclass constructor?
Do static variables of an ApplicationContext subclass left untouched when the process is killed?
View 4 Replies View RelatedMy use case is to launch one of settings app screen when I receive a certain event in idle state. For which, I added my new intent to PhoneAppBroadcastReceiver() in PhoneApp.java (looks like this receiver handles the misc intents) But when i call startActivity(), The phone seems to go into a panic ex. startActivity(new Intent(this, NetworkSetting.class)); My questions are is this the right approach to go about ? If so 1. How can I launch the activity inside of broadcastReceiver? secondly 2. How do i verify if the activity i want to start is already started?Can the NEW_TASK_LAUNCH be used to verify this ,
View 2 Replies View RelatedI have splitted my Android project in 2 packages, lets say: test.current and test.another. From an activity in test.current I want to start an activity in the package test.another
View 6 Replies View RelatedWhy should I use startActivity() in a Service? If I need an Activity a have to call an activity and if I need a "delayed activity" I have to use the notification. So, why should I use startActivity()?
View 1 Replies View RelatedI'm new in Android development and I've a problem when I create my new activity.I want to use my activity before start it. For example, But, my "menu" and "MyActivity.class" aren't the same instance.
View 2 Replies View RelatedAccording to the doc, if the intent in startActivity(intent) is not found, there will be an exception raised. Therefore I use a try/catch block. However, even if I use a random string as the intent, the promised exception does not occur.Instead I see a dialog that says: "No application can perform this function". I also get the same dialog if the intent is valid (picked up by an app) but apparently doesn't want to act when the extras are not what the app expects (e.g. my earlier question about Intent.ACTION_SEND and mime types). I am using the 1.5_r2 SDK on an AVD running 1.5, with the app running at version 1.1 (sdk=2). Is this a doc error, a bug or am I misunderstanding something? Can I simply delete the try/catch block?
View 3 Replies View RelatedI have a TabActivity subclass that attempts to start a new activity via a menu item selection in onOptionsItemSelected.I am receiving the following exception which eludes me at the moment.I'm not sure why it thinks I am *not* in an activity!
View 2 Replies View RelatedI'd like to launch one of settings app screen when I received a certain event in idle state. For that, I added my new intent to PhoneAppBroadcastReceiver() in PhoneApp.java (because it seems this receiver handles the misc intents) But if I called startActivity(), seems phone goes to panic. ex. startActivity(new Intent(this, NetworkSetting.class));
1. How can I launch the activity inside of bradcastreceiver?
2. If the activity which I want to start is already started, how can I check it? I read can use NEW_TASK_LAUNCH but don't know how to use it. If you have a sample code, could you post it?
what is the scenario that makes me to pick between startActivity and startSubActivity
View 2 Replies View RelatedWhat's the correct way to pass a bundle to the activity that is being launched from the current one? Shared properties?
View 2 Replies View RelatedIs there any event triggered on an activity when I call startActivity("activity_id", myIntent);
If the Activity exists already. I pass a parameter to the activity via i.putExtra("someID", someSerializableObject ); and would like to call a method to refresh a WebView. Right now, the call on startActivity brings the activity in the foreground but the webview does not display what i want.
I meet an issue: my activity cannot return result.
I created an activity which has one TabHost. I added three tabs using mTabHost.addTab. Every tab will launch an activity(activity A, activity B, activity C). In activity A, it will call startActivityForResult to start activity A1. The issue is activity A cannot get any result after A1 finish.
What is the reason? How should I do if I want to get return value?
I have a main activity and a sub activity.The main activity starts the sub activity using startActivity, and passes an object in the intent.The sub activity reads the object out of the intent in its onCreate action.The sub activity updates the object, then returns to the main activity using startActivity, again passing the updated object back.However, the main activities onCreate function is not called, so the code it contains to read the passed object does not run.Further investigation indicated that the main activity onPause event is firing, i.e. it is only paused when the sub activity runs, so when the sub activity starts the main activity again, it just on Resumes.Does anyone know if there would be any disadvantages if I moved my data restore/store activities to the onResume and onPause events?I'm not using the onCreate saved Instance State, should I be?
View 4 Replies View RelatedI'm using an AlarmManager to trigger an intent that broadcasts a signal. The following is my code:
CODE:................
I'm calling this code from an activity, so I don't know how I could be getting the following error...
CODE:....................
Is this really what you want?
I have implemented a ListView in my Android application.
I bind to this ListView using a custom subclass of the ArrayAdapter class. Inside the overridden ArrayAdapter.getView(...) method, I assign an OnClickListener. In the onClick(View v) method of the OnClickListener, I want to launch a new activity.
I get the exception:
Calling startActivity() from outside of an Activity context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want?
How can I get the context that the ListView (the current Activity) is working under?
I'm struggling to understand why startActivity runs properly when copied from a tutorial I found and fails when I make the smallest change.
Code from the tutorial:
CODE:........
That works. When I try to change it to what I would consider a simpler design, I am getting an error.
CODE:........
The error is: The constructor Intent(FirstTwoApps.ButtonHandler, Class) is undefined
Notice that all I did was moved the action from the handleButtonClick() method to the onClick() method. Apparently that is not allowed, but I don't understand why.
I have a problem about taskAffinity of Activity. Activities A and B with the same taskAffinity.
A starts B with FLAG_ACTIVITY_NEW_TASK and the B starts A with FLAG_ACTIVITY_NEW_TASK again. Dumpsys activity of system gives us task stack like below: TOP-> A B A
According to SDK's reference to FLAG_ACTIVITY_NEW_TASK, the result is supposed to be like below: TOP -> A B
If we did not set taskAffinity, A will not be created again but in different task stack from B. (A and B are in different Apps)
After a little more research, we found FLAG_ACTIVITY_REORDER_TO_FRONT is what we want.
My question is whether SDK' reference to FLAG_ACTIVITY_NEW_TASK is wrong?