Android :: Why Does StartActivity Work In One Method And Fail In Another

Aug 17, 2010

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:


That works. When I try to change it to what I would consider a simpler design, I am getting an error.


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.


Cannot Find Symbol - Method StartActivity?

Apr 5, 2012

I am developing an application in order to connect to Google Navigator by the following code..

public static void Call_GoogleMapsNavigation(int longitud,int latitud)

import android.content.Context;
import android.content.Intent;[code].....

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Android :: RTSP Streaming Video Files - Fail To Work On Android Device

Jul 10, 2010

I've Set up wowza streaming server in my ubuntu box for RTSP streaming video files. The video gets stream perfectly when I've Totem video player at client side. The same URL or video is failing to work on android device and the application that tries to access that RTSP URL breaks with Mediaplayer error (1,-1).

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Android :: AddView And Layout Method Doesn't Work Together

Sep 9, 2010

In Android when I am adding a view object like ImageView to FrameLayout view and then immediately trying to call layout() method to repositioned the added view object it is not working. But when I call the layout method alone after some new event e.g. touch event then layout() seems to work. This also happens when bringToFront() and layout() is used together, layout() does not seems to work together with other method. Is there any reason why is this like this? Also instead of adding view object in the middle of the screen can it be ADDED at some specific location in FrameLayout?

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Samsung EPIC 4G :: Getprop Method Of Getting MSL Will Work On Phone?

Aug 10, 2010

Does anyone know if the getprop method of getting the MSL will work on the epic?

I need the MSL so I can load a custom PRL to force roam on verizon. Would you still load the prl using ##775# or is that a htc thing

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Android :: Method OnBackPressed() Of Type FirstGroup Must Override Superclass Method

Sep 7, 2010

I'm trying to override the onBackPressed() method of the ActivityGroup class:

public class MyClass extends ActivityGroup {

public void onBackPressed() {
// do something

but I'm getting the error The method onBackPressed() of type MyClass must override a superclass method. I'm relatively new to Java, I've seen here that people do it and it works for them Why I'm getting this error? I'm writing an app for android 1.5, could the problem be here?

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Android :: Show Method Definition - Eclipse Recognizes Warning On Method

Nov 22, 2010

In Eclipse, when I mouse hover over a built-in method, it displays a method definition including stuff like what the method does, input objects, return objects etc. If I have a yellow line (warning) under the method I'm trying to use, I can't get the mouse-over to show the definition. If I try hitting F3, I get a "The Jar of this class file belongs to container "Android 1.6" How do I show the definition of the method I am using when there is a warning?

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Android :: Method.getAnnotation( ) Or Method.isAnnotationPresent( ) Not Working

May 12, 2010

I am trying to use annotation - method.getAnnotation( ) or method.isAnnotationPresent( ) and it is not working. I am using eclipse emulator for 2.1 OS version with JDK 1.6. Following is information about what I did..................

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Android :: How Do I Do A StartActivity In BroadcastReceiver?

Apr 7, 2009

My 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 (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 ,

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Android :: StartActivity In Another Package

Nov 23, 2009

I 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

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Android :: Why Should I Use StartActivity In A Service?

Jul 15, 2010

Why 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()?

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Android :: Action Before StartActivity

Jul 22, 2010

I'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.

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Android :: StartActivity And ActivityNotFoundException

Jun 29, 2009

According 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?

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Android :: StartActivity From Subclass?

May 15, 2009

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:


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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Android :: Calling StartActivity From Outside Of An Activity

Dec 7, 2009

I 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!

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Android :: How I Call StartActivity In BradocastReceiver?

Apr 7, 2009

I'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 (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?

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Android :: What Is Difference Between StartActivity And StartSubActivity?

Mar 3, 2009

what is the scenario that makes me to pick between startActivity and startSubActivity

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Android :: Way To Pass Bundle On StartActivity?

Apr 20, 2009

What's the correct way to pass a bundle to the activity that is being launched from the current one? Shared properties?

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Android :: Activity Events On StartActivity

Sep 28, 2010

Is 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.

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Android :: StartActivity() In A Subclass Of Dialog?

Nov 23, 2010

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).

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Android : TabHost And StartActivity For Result?

Sep 2, 2009

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?

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Android :: Should StartActivity Always Run Started Activities OnCreate?

Aug 10, 2010

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?

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Android :: Calling StartActivity From Outside Of An Activity - Getting Error

Sep 11, 2010

I'm using an AlarmManager to trigger an intent that broadcasts a signal. The following is my code:


I'm calling this code from an activity, so I don't know how I could be getting the following error...


Is this really what you want?

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Android :: Calling StartActivity From Outside Of An Activity Context

Oct 12, 2010

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?

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Android :: TaskAffinity Causes New Instance Being Created When StartActivity

Jun 9, 2010

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?

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Android : How Can I Prevent Apps From Invoking StartActivity

Oct 15, 2009

I have an Activity X which is only accessible after you've entered a valid credential.

How can I prevent other apps from calling startActivity with an Intent pointing to X?

e.g. Intent intent = new Intent( this, ActivityX.class );
startActivity( intent );

Basically I don't want Activity X to be exported to any apps except my app.

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Android : Purpose Of Using Intent.createChooser() In StartActivity()?

Sep 27, 2010

When ever we need to send an email in Android we will invoke registered email application using Intent.ACTION_SEND. like the below

Intent i = new Intent(Intent.ACTION_SEND);

startActivity(Intent.createChooser(i, "Send mail..."));

My doubt is why do we need to use Intent.createChooser in startActivity rather than using

Is there any specific reason of using Intent.createChooser()?

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Android :: StartActivity -ForResult - At The Creation Of Main Activity

Mar 31, 2010

I would like to display a an access dialog activity at the start of my application.

In other words, I would like to start another activity (in dialog theme) as soon as my Main Activity is loaded. But, I know that I can not start an activity while another is creating.

I tried to start this activity in the onResume() method : I can see the new activity called, but the Main activity do not respond after closing the new activity.

Is there a solution to do this, without using delayed intent ? May i use a special flag for my intent ? I did not find, in the activity cycle, a way to detect the end of activity loading.

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Android :: StartActivity -intent - And Resume To Main Activity

Jul 2, 2010

I've got an app that creates an intent for the android app in which it will start the "recommended" station for my account when i press a button. The trick i'm trying to figure out is how do i get the phone back to my app without the user having to navigate back manually? Once it start the intent it takes you to the playlist and i need it to resume back to my app automatically.

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Android :: Pass Intent Via StartActivity() To A Running Activity

Aug 10, 2010

MyService and MyClient are both running, although MyClient is currently in the background. If MyService sends an Intent to MyClient via:


How do I get this Intent in MyClient? Running this code triggers onResume() in MyClient, but because it's already running, calling getIntent() returns the Intent that initially created MyClient, which is always android.intent.action.MAIN

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Android : StartActivity Intent Fails When Certain Apps Are Running

Jan 27, 2010

I am running into a critical conflict of sorts. My app is a remote service which essentially starts an activity when the screen goes to sleep. How it does this is very simple via screen off broadcast receiver and then an explicit intent to start the activity as a new task. The activity is basically in charge of responding to key events and displaying some simple text.

Thanks to a few window flags added in 2.0, activities can do this. They can be created in a way that either puts them on top of the lockscreen, or completely dismiss the lockscreen. This way they basically have focus without the lockscreen having to be dismissed by user. The alarm clock in 2.0 uses the flags to wake up the device and show the alarm dialog. I use them to place my activity when the screen sleeps so the user sees a custom wakeup lockscreen. The reason we create it at screen off is to get rid of lag the user experiences at wakeup involving first seeing the lockscreen, then seeing the activity appear. Also doing it immediately at sleep allows it to have focus so it can handle key events effectively.

The process works perfectly except in certain apps. So far, it seems the bug is consistent while browser (and even dolphin browser) as well as the facebook app are running. The bug never happens in GTalk or Launcher. It is rare but can still be duplicated in the messaging app every so often. I can't figure out why my activity doesn't get created at sleep while these apps are active. My remote service still gets the screen off broadcast and does the startActivity for the explicit intent, and that's all I get in the log. My onCreate is not being called. Instead it gets called when we wake the screen up again.

I have tried, as a control, to hold the partial wakelock starting when my remote service gets created, and the issue persists. So I don't believe it is a problem that the CPU has gone to sleep. Since only these particular apps cause the issue to duplicate, I can't imagine why the activity start fails. What could those apps be doing to interfere with another app's ability to get created? I use singleInstance as the launch mode so that I can ensure that the activity will never be able to be recalled by user process. I want it to go away when user unlocks and it is working fine like this, as long as it is able to be created. The singleInstance ensures I can have the same lockscreen handle an intent to do something specific based on user actions that the remote service monitors.

my source code can be viewed on my project page.

The issue happens to both my CustomLockService and NoLockService variations. These two services will start Lockscreen or ShowWhenLockedActivity and the bug is witnessed. The build illustrating the bug's end result-- user has to try to unlock 3 times due to the bug because on wakeup when the oncreate finally succeeds, user is seeing the activity when normally it would have auto-dismissed thanks to key event logic that also isn't seeming to happen due to the delayed onCreate, so they have to send it to sleep again. Now that the activity is properly done being started, and screen is asleep, the expected functionality happens at next wakeup-- can be downloaded also from the downloads tab.

This seems like an extremely irrational thing to be caused only by specific apps. I am quite baffled and out of ideas for a solution unless I've made some critical mistake in my activity definitions.

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Android :: Update Intent Of An Existing Activity While Calling StartActivity

Sep 13, 2010

I am having two activities, say activity A and B. Activity A is an ListActivity, and when the items in the list is selected, it will call startActivity() to bring up B. The problem here is that when I am in B and click the home key, and then go to the application launcher to resume my application, A will be brought up again. This time when I click a different item in A, it will bring up B with the old data of the previously selected item before the home key was clicked.

After examinzing the code, I found that the startActivity does not update the intent of B. I found a post here about the similar question, and the answer was to overwrite the onNewIntent. However, I found that it doesn't work, because this method never get called when the second time I call startActivity. I am sure that this is the same instance, because I've printed out the instance number. Is there any other ways to update the intent of the activity? Or I need some other settings to make the onNewIntent get called? I didn't set any flags or launch modes, so everything is default.

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Android :: Calling StartActivity From Outside Of An Activity Context Requires The Flag_activity_new_task Flag

Sep 21, 2010

I tried to create a edittextbox, and button next to it, in the status bar.! I created it and tried to launch the browser activity, when somebody enters a URL in the textbox & click that button.

I get runtime exception as below.Can anyone please help what is the issue with this exception ? I know that Status bar is not a seperate activity. It is part of 'PhoneWindow'.


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Startactivity Force Close

Mar 4, 2012

package com.danielholst.soundmixer;
import android.content.Intent;
import android.os.Bundle;

public class LoadingSplashScreen extends Activity {
/** Called when the activity is first created. */

[Code] ...

xml here

android:theme="@android:style/Theme.NoTitleBar" >

[Code] ......

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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 :


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 :: Fail To Connect To Camera

Apr 1, 2010

I'm using the Android APIDemo sample code.

When I run the CameraPreview example, at first it was giving me an error.(

I traced that one down and the sample was working for a while.

Now, it no longer works. It says ERROR/AndroidRuntime(2949): java.lang.RuntimeException: Fail to connect to camera service

What can be causing that? It happens when is called.

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Android :: Why SQLiteOpenHelper.onUpgrade Fail?

Sep 13, 2010

Every time i increase my database version and push the upgraded app to the users, something weird happens.. For some it works perfectly fine, and some report crashes (including through the Market's reporting system) caused by the lack of table columns i just added in onUpgrade.

If you want to see the method:

I can't spot any exceptions that appear in onUpgrade. What i'm currently doing to bypass these problems is intercepting the exceptions where the new fields are invoked for the first time and then calling onUpgrade 'manually', which is kind of dirty.

Also, the app sometimes generates a 'no such table' SQLiteException when accessing the main table (again, only for some users) which is incredibly strange... Does someone know why these things happen? Or can you spot something wrong in my code?

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Android :: When Going On Any Droid App - It Says Login Fail

May 30, 2010

I have a problem with my Motorola Droid; When i try to go onto one of my droid apps; and when i log on... it says "Login fail" WHat cando i have to do in order to go back to being able to login to my apps? This includes my Meebo app, Yahoo Messeneger app. and my photobucket app will not let my download a pic. to my phone, I use to be able to do all of this, but now it isnt working.

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Android : Fail To Launch SDK 2.0 Tool On OS X

Nov 2, 2009

I downloaded the SDK 2.0 toolkit and tried to launch the android tool to download the latest SDK. The application seems to launch with the following output:

$ ./android-sdk-mac/tools/android Starting Android SDK and AVD Manager No command line parameters provided, launching UI. See 'android --help' for operations from the command line. $

That's it. Nothing happens, no UI appears or any processes are started (check with ps, but there is no new java process). I'm running this on Mac OS X 10.5.8. The previous SDK s runs fine.

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Android :: Fail To Connect Camera Service On G1

Nov 16, 2009

I apologize in advance for this long post, but it's necessary to show what is happening.

I've been working on an app that works on the 1.6 emulator, but bombs on my G1.

Here is the Photographer activity:


And here is where this activity gets called from:


Having trouble pasting the relevant portions of AndroidManifest.xml, but I have permissions for Camera:


Here's the Photographer part:


Also set for testing on G1:


and working off of 1.6:

<uses-sdk android:minSdkVersion="4" />

All this works on a 1.6 emulator, but when I run this on the G1, LogCat shows:


And /data/anr/traces.txt shows:


It sounds like the problem is a timeout issue, but I am at a loss as to where I should be looking ....

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