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2014/10/16 ¤W¤È 08:26:21
android Programming Glossary: theseQuitting an application - is that frowned upon? http://stackoverflow.com/questions/2033914/quitting-an-application-is-that-frowned-upon writing. I have no intention of changing your mind rather these are here for others who come to read this post in the future...
Get/pick an image from Android's built-in Gallery app programmatically http://stackoverflow.com/questions/2169649/get-pick-an-image-from-androids-built-in-gallery-app-programmatically Intent.EXTRA_STREAM iterate over these images for Parcelable parcel list Uri uri Uri parcel handle..
How to discover memory usage of my application in Android http://stackoverflow.com/questions/2298208/how-to-discover-memory-usage-of-my-application-in-android debuggerd Here the Vss and Rss columns are basically noise these are the straight forward address space and RAM usage of a process..
Sending and Parsing JSON in Android http://stackoverflow.com/questions/2818697/sending-and-parsing-json-in-android json parsing share improve this question I am surprised these have not been mentioned but instead of using bare bones rather..
http://stackoverflow.com/questions/4725773/ffmpeg-on-android need to be used for playback. Can you please help me with these questions and get me started on this Your help is greatly appreciated...
Android: How to declare global variables? http://stackoverflow.com/questions/708012/android-how-to-declare-global-variables this leads more naturally to how you should be managing these things initializing them on demand. This ignores the fact that..
When to call activity context OR application context? http://stackoverflow.com/questions/7298731/when-to-call-activity-context-or-application-context context There has been a lot of posting about what these two contexts are.. But I'm still not getting it quite right.. . Android internally tracks bindings via these ServiceConnections and holds references to the Contexts that..
Android accelerometer accuracy (Inertial navigation) http://stackoverflow.com/questions/7829097/android-accelerometer-accuracy-inertial-navigation Y directions parallel to the table so no gravity acting in these directions . I then averaged these readings and used this value.. so no gravity acting in these directions . I then averaged these readings and used this value to calibrate the phone subtracting.. Y directions. I would expect given the calibration that these accelerations should add up to 0 roughly in each direction...
Android Activity Life Cycle - What are all these methods for? http://stackoverflow.com/questions/8515936/android-activity-life-cycle-what-are-all-these-methods-for Activity Life Cycle What are all these methods for What is the life cycle of an Android activity Why.. others onPause onStop onDestroy called at the end When are these methods called and how should they be used properly android.. of the activity to save space. You can distinguish between these two scenarios with the isFinishing method. EDIT When the Activity..
R cannot be resolved - Android error http://stackoverflow.com/questions/885009/r-cannot-be-resolved-android-error imports. This will cause your make to break. Look out for these erroneous import statements and delete them. While going through..
Android - basic gesture detection http://stackoverflow.com/questions/937313/android-basic-gesture-detection on my Android application today. I've been looking at these sources Detect Gestures Tutorial SDK docs Calculator Code Nothing..
http://stackoverflow.com/questions/9671546/asynctask-android-example to postExecute to then show any results of processing. See these lines where you later yout TextView TextView txt TextView findViewById..
AlphabetIndexer with Custom Adapter managed by LoaderManager http://stackoverflow.com/questions/10224233/alphabetindexer-with-custom-adapter-managed-by-loadermanager getResources .getDrawable R.drawable.list_divider These are the Contacts rows that we will retrieve. final String CONTACTS_SUMMARY_PROJECTION..
AutoCompleteTextView backed by CursorLoader http://stackoverflow.com/questions/12854336/autocompletetextview-backed-by-cursorloader filter the user has provided. private String mCurFilter These are the Contacts rows that we will retrieve. final String CONTACTS_SUMMARY_PROJECTION..
'Must Override a Superclass Method' Errors after importing a project into Eclipse http://stackoverflow.com/questions/1678122/must-override-a-superclass-method-errors-after-importing-a-project-into-eclips new OnCreateContextMenuListener These arguments have their correct names public void onCreateContextMenu..
Android intent filter for a particular file extension? http://stackoverflow.com/questions/1733195/android-intent-filter-for-a-particular-file-extension The . at the beginning matches any squence of characters. These strings require double escaping so . matches a literal period...
Difference between px, dp, dip and sp in Android? http://stackoverflow.com/questions/2025282/difference-between-px-dp-dip-and-sp-in-android unit that is based on the physical density of the screen. These units are relative to a 160 dpi screen so one dp is one pixel..
How do I get the SharedPreferences from a PreferenceActivity in Android? http://stackoverflow.com/questions/2614719/how-do-i-get-the-sharedpreferences-from-a-preferenceactivity-in-android of PreferenceActivity PreferenceFragment states that These preferences will automatically save to SharedPreferences as.. etc of the applications. Activity handled preferences These preferences can only be used within the particular activity..
How to Read MMS Data in Android? http://stackoverflow.com/questions/3012287/how-to-read-mms-data-in-android I'm using . Now you can loop through the Cursor as usual. These are the more important columns you would want to use _id is..
Adding a library/JAR to an Eclipse Android project http://stackoverflow.com/questions/3642928/adding-a-library-jar-to-an-eclipse-android-project error in Eclipse does it have this problem on the emulator These two questions are rhetorical for I'm going to answer them myself..
What is the Android UiThread (UI thread) http://stackoverflow.com/questions/3652560/what-is-the-android-uithread-ui-thread most of your event handling code is run in this UIThread. These are methods like OnCreate OnPause OnDestroy OnClick etc. Additionally..
Android: Is application running in background? http://stackoverflow.com/questions/3667022/android-is-application-running-in-background from using it. And here's why. As Dianne Hackborn wrote These APIs are not there for applications to base their UI flow on..
http://stackoverflow.com/questions/3815090/webview-and-html5-video WebView but I must say I had to deal with it for few days. These are the steps I had to follow so far Find a properly encoded..
Implement page curl on android? http://stackoverflow.com/questions/3912849/implement-page-curl-on-android transform around the y axis to rotate the curled page. These two steps could be combined through simple substitution but..
Any good graphing packages for Android? [closed] http://stackoverflow.com/questions/424752/any-good-graphing-packages-for-android very nice open source native libraries have been created. These include ChartDroid AndroidPlot AChartEngine And a commercial..
http://stackoverflow.com/questions/4369537/update-ui-from-thread Progress... to publish one or more units of progress. These values are published on the UI thread in the onProgressUpdate..
How to programatically create and read WEP/EAP WiFi configurations in Android? http://stackoverflow.com/questions/4374862/how-to-programatically-create-and-read-wep-eap-wifi-configurations-in-android to ReadConfigLog.txt e.getMessage reflection magic These are the fields we are really interested in try Let the magic..
Cannot Make Static Reference to Non-Static Method http://stackoverflow.com/questions/4969171/cannot-make-static-reference-to-non-static-method work on objects that are of a particular type the class . These are created with the new like this SomeClass myObject new SomeClass..
Benefit of using Parcelable instead of serializing object http://stackoverflow.com/questions/5550670/benefit-of-using-parcelable-instead-of-serializing-object and the second is to pass a Parcelable to a service. These two mechanisms are not interchangeable and should not be confused...
Getting an issue while checking the dynamically generated checkbox through list view http://stackoverflow.com/questions/7738527/getting-an-issue-while-checking-the-dynamically-generated-checkbox-through-list use compare my example further below and or this answer . These two methods are there for using two or more list items which..
Android Activity Life Cycle - What are all these methods for? http://stackoverflow.com/questions/8515936/android-activity-life-cycle-what-are-all-these-methods-for the states an activity can go through during its lifetime These states can be broken into 3 main groups as follows Active or..
Quitting an application - is that frowned upon? http://stackoverflow.com/questions/2033914/quitting-an-application-is-that-frowned-upon to the various answers already given at the time of this writing. I have no intention of changing your mind rather these are here for others who come to read this post in the future. The point is that I cannot allow for Android to determine..
Get/pick an image from Android's built-in Gallery app programmatically http://stackoverflow.com/questions/2169649/get-pick-an-image-from-androids-built-in-gallery-app-programmatically of selected images ArrayList Parcelable list intent.getParcelableArrayListExtra Intent.EXTRA_STREAM iterate over these images for Parcelable parcel list Uri uri Uri parcel handle the images one by one here Note that this is only supported..
How to discover memory usage of my application in Android http://stackoverflow.com/questions/2298208/how-to-discover-memory-usage-of-my-application-in-android system bin servicemanager 54 256K 252K 69K 64K system bin debuggerd Here the Vss and Rss columns are basically noise these are the straight forward address space and RAM usage of a process where if you add up the RAM usage across processes you..
Sending and Parsing JSON in Android http://stackoverflow.com/questions/2818697/sending-and-parsing-json-in-android and parsing JSON Objects. Complete Solution android json parsing share improve this question I am surprised these have not been mentioned but instead of using bare bones rather manual process with json.org's little package GSon and Jackson..
http://stackoverflow.com/questions/4725773/ffmpeg-on-android Also I could not find documentation on the FFMPEG apis which need to be used for playback. Can you please help me with these questions and get me started on this Your help is greatly appreciated. android ffmpeg share improve this question Here..
Android: How to declare global variables? http://stackoverflow.com/questions/708012/android-how-to-declare-global-variables of an Application subclass in this aspect. She continues And this leads more naturally to how you should be managing these things initializing them on demand. This ignores the fact that there is no reason you cannot initialize on demand using..
When to call activity context OR application context? http://stackoverflow.com/questions/7298731/when-to-call-activity-context-or-application-context to call activity context OR application context There has been a lot of posting about what these two contexts are.. But I'm still not getting it quite right As I understand it so far Each is an instance of its class which.. the binding between Activity instances via onRetainNonConfigurationInstance . Android internally tracks bindings via these ServiceConnections and holds references to the Contexts that create the bindings. If you bind from the Activity then the..
Android accelerometer accuracy (Inertial navigation) http://stackoverflow.com/questions/7829097/android-accelerometer-accuracy-inertial-navigation and sampled 1000 accelerometer readings in the X and Y directions parallel to the table so no gravity acting in these directions . I then averaged these readings and used this value to calibrate the phone subtracting this value from each.. readings in the X and Y directions parallel to the table so no gravity acting in these directions . I then averaged these readings and used this value to calibrate the phone subtracting this value from each subsequent reading . I then tested.. table and sampling 5000 accelerometer readings in the X and Y directions. I would expect given the calibration that these accelerations should add up to 0 roughly in each direction. However this is not the case and the total acceleration over..
Android Activity Life Cycle - What are all these methods for? http://stackoverflow.com/questions/8515936/android-activity-life-cycle-what-are-all-these-methods-for Activity Life Cycle What are all these methods for What is the life cycle of an Android activity Why are so many similar sounding methods onCreate onStart onResume.. onStart onResume called during initialization and so many others onPause onStop onDestroy called at the end When are these methods called and how should they be used properly android lifecycle oncreate onresume ondestroy share improve this.. because the system is temporarily destroying this instance of the activity to save space. You can distinguish between these two scenarios with the isFinishing method. EDIT When the Activity first time loads the events are called as below onCreate..
R cannot be resolved - Android error http://stackoverflow.com/questions/885009/r-cannot-be-resolved-android-error especially when you ask Eclipse to sort or otherwise manage imports. This will cause your make to break. Look out for these erroneous import statements and delete them. While going through the Android sample tutorials I would often use the Ctrl..
Android - basic gesture detection http://stackoverflow.com/questions/937313/android-basic-gesture-detection I've been battling to get 'fling' gesture detection working on my Android application today. I've been looking at these sources Detect Gestures Tutorial SDK docs Calculator Code Nothing has worked for me so far and I was hoping for some pointers...
http://stackoverflow.com/questions/9671546/asynctask-android-example thread you can even pass the result of the long operation to postExecute to then show any results of processing. See these lines where you later yout TextView TextView txt TextView findViewById R.id.output txt.setText Executed put them in PostExecute..
AlphabetIndexer with Custom Adapter managed by LoaderManager http://stackoverflow.com/questions/10224233/alphabetindexer-with-custom-adapter-managed-by-loadermanager true lv.setScrollingCacheEnabled true lv.setDivider getResources .getDrawable R.drawable.list_divider These are the Contacts rows that we will retrieve. final String CONTACTS_SUMMARY_PROJECTION new String ContactsContract.Contacts._ID..
AutoCompleteTextView backed by CursorLoader http://stackoverflow.com/questions/12854336/autocompletetextview-backed-by-cursorloader mView If non null this is the current filter the user has provided. private String mCurFilter These are the Contacts rows that we will retrieve. final String CONTACTS_SUMMARY_PROJECTION new String ContactsContract.Contacts._ID..
'Must Override a Superclass Method' Errors after importing a project into Eclipse http://stackoverflow.com/questions/1678122/must-override-a-superclass-method-errors-after-importing-a-project-into-eclips to manually populate them myself. For instance list.setOnCreateContextMenuListener new OnCreateContextMenuListener These arguments have their correct names public void onCreateContextMenu ContextMenu menu View v ContextMenuInfo menuInfo ..
Android intent filter for a particular file extension? http://stackoverflow.com/questions/1733195/android-intent-filter-for-a-particular-file-extension what extension you want to match in this example .kdb . The . at the beginning matches any squence of characters. These strings require double escaping so . matches a literal period. Then you end with your file extension. One caveat with pathPattern..
Difference between px, dp, dip and sp in Android? http://stackoverflow.com/questions/2025282/difference-between-px-dp-dip-and-sp-in-android of the screen. dp Density independent Pixels an abstract unit that is based on the physical density of the screen. These units are relative to a 160 dpi screen so one dp is one pixel on a 160 dpi screen. The ratio of dp to pixel will change..
How do I get the SharedPreferences from a PreferenceActivity in Android? http://stackoverflow.com/questions/2614719/how-do-i-get-the-sharedpreferences-from-a-preferenceactivity-in-android icicle addPreferencesFromResource R.xml.preference The javadoc of PreferenceActivity PreferenceFragment states that These preferences will automatically save to SharedPreferences as the user interacts with them. To retrieve an instance of SharedPreferences.. can be used by all the components activities services etc of the applications. Activity handled preferences These preferences can only be used within the particular activity and can not be used by other components of the application...
How to Read MMS Data in Android? http://stackoverflow.com/questions/3012287/how-to-read-mms-data-in-android However you cannot do that with this provider so that's why I'm using . Now you can loop through the Cursor as usual. These are the more important columns you would want to use _id is the ID of the message. Captain obvious to the rescue Not really...
Adding a library/JAR to an Eclipse Android project http://stackoverflow.com/questions/3642928/adding-a-library-jar-to-an-eclipse-android-project Why when I get no compilation or linker error in Eclipse does it have this problem on the emulator These two questions are rhetorical for I'm going to answer them myself below. Other posts in this forum creep up to the problem..
What is the Android UiThread (UI thread) http://stackoverflow.com/questions/3652560/what-is-the-android-uithread-ui-thread single Activity class. Then all of the lifecycle methods and most of your event handling code is run in this UIThread. These are methods like OnCreate OnPause OnDestroy OnClick etc. Additionally this is where all of the updates to the UI are made...
Android: Is application running in background? http://stackoverflow.com/questions/3667022/android-is-application-running-in-background indeed works most of the time I strongly recommend to refrain from using it. And here's why. As Dianne Hackborn wrote These APIs are not there for applications to base their UI flow on but to do things like show the user the running apps or a task..
http://stackoverflow.com/questions/3815090/webview-and-html5-video possible to view a video element video html5 tag within a WebView but I must say I had to deal with it for few days. These are the steps I had to follow so far Find a properly encoded video When initializing the WebView set the JavaScript Plug..
Implement page curl on android? http://stackoverflow.com/questions/3912849/implement-page-curl-on-android sin theta v1.z r 1 cos beta cos theta Apply a basic rotation transform around the y axis to rotate the curled page. These two steps could be combined through simple substitution but are left separate to keep the math simple for debugging and..
Any good graphing packages for Android? [closed] http://stackoverflow.com/questions/424752/any-good-graphing-packages-for-android this question UPDATE Since this question was asked a few very nice open source native libraries have been created. These include ChartDroid AndroidPlot AChartEngine And a commercial chart ShinobiControls ORIGINAL It looks like the creator of..
http://stackoverflow.com/questions/4369537/update-ui-from-thread back to the last step. This step can also use publishProgress Progress... to publish one or more units of progress. These values are published on the UI thread in the onProgressUpdate Progress... step. onProgressUpdate Progress... invoked on..
How to programatically create and read WEP/EAP WiFi configurations in Android? http://stackoverflow.com/questions/4374862/how-to-programatically-create-and-read-wep-eap-wifi-configurations-in-android logs using Logcat 5000 Log.e WifiPreference Could not write to ReadConfigLog.txt e.getMessage reflection magic These are the fields we are really interested in try Let the magic start Class wcClasses WifiConfiguration.class.getClasses..
Cannot Make Static Reference to Non-Static Method http://stackoverflow.com/questions/4969171/cannot-make-static-reference-to-non-static-method the difference in the two. Instance non static methods work on objects that are of a particular type the class . These are created with the new like this SomeClass myObject new SomeClass To call an instance method you call it on the instance..
Benefit of using Parcelable instead of serializing object http://stackoverflow.com/questions/5550670/benefit-of-using-parcelable-instead-of-serializing-object The first is to pass a bundle to an activity using an intent and the second is to pass a Parcelable to a service. These two mechanisms are not interchangeable and should not be confused. That is the Parcelable is not meant to be passed to an..
Getting an issue while checking the dynamically generated checkbox through list view http://stackoverflow.com/questions/7738527/getting-an-issue-while-checking-the-dynamically-generated-checkbox-through-list works but your obviously misinterpreting it's use compare my example further below and or this answer . These two methods are there for using two or more list items which completely differs from each other e.g. a common list item..
Android Activity Life Cycle - What are all these methods for? http://stackoverflow.com/questions/8515936/android-activity-life-cycle-what-are-all-these-methods-for memory and resources. The following diagram illustrates the states an activity can go through during its lifetime These states can be broken into 3 main groups as follows Active or Running Activities are considered active or running if they..
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