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2014/10/16 ¤W¤È 08:17:51
android Programming Glossary: letsWhat is the best IDE to develop Android apps in? [closed] http://stackoverflow.com/questions/1715697/what-is-the-best-ide-to-develop-android-apps-in opinion. Plus I'm a big IntelliJ fan. The IntelliJ plugin lets you make apk files and push the app to the emulator that's all..
How to make a nice looking ListView filter on Android [closed] http://stackoverflow.com/questions/1737009/how-to-make-a-nice-looking-listview-filter-on-android weight param expand it Note the use of the default ID This lets us use a ListActivity still ListView android id @android id..
How to programmatically setting style attribute in a view http://stackoverflow.com/questions/2016249/how-to-programmatically-setting-style-attribute-in-a-view . There is also such a thing as a StateListDrawable which lets you define different drawables for each state the your Button..
How to emulate GPS location in the Android Emulator? http://stackoverflow.com/questions/2279647/how-to-emulate-gps-location-in-the-android-emulator Emulator via Telnet. You then have a Emulator console that lets you enter certain data like geo fixes network etc. How to use..
http://stackoverflow.com/questions/2317428/android-i-want-to-shake-it gravity. It will be approx. 0 if there is no movement and lets say 2 if the device is shaked. Notes The accelometer should..
Android ImageButton with a selected state? http://stackoverflow.com/questions/2604599/android-imagebutton-with-a-selected-state to be no highlighted or selected or similar state which lets me toggle its appearance at will. Here's my XML it only changes..
http://stackoverflow.com/questions/3441396/defining-custom-attrs attr element has two xml attributes name and format . name lets you call it something and this is how you end up referring to..
http://stackoverflow.com/questions/3572463/what-is-context-in-android the context of current state of the application object. It lets newly created objects understand what has been going on. Typically..
What is the Android UiThread (UI thread) http://stackoverflow.com/questions/3652560/what-is-the-android-uithread-ui-thread applications are performed in this thread. For instance lets say your application is a single Activity class. Then all of..
How to set text color of TextView in code? http://stackoverflow.com/questions/4602902/how-to-set-text-color-of-textview-in-code nice and red D This is a surprisingly popular question so lets make this answer as complete as possible You can use various..
Why does ContentResolver.requestSync not trigger a sync? http://stackoverflow.com/questions/5253858/why-does-contentresolver-requestsync-not-trigger-a-sync needed so ContentResolver can call it . The intent filter lets it catch an intent requesting sync. This intent comes from ContentResolver..
How can I get root permissions through the Android SDK? http://stackoverflow.com/questions/5293615/how-can-i-get-root-permissions-through-the-android-sdk .exec su That causes SuperUser to show which lets you either Allow or Block it from root access. This approach..
Trying to attach a file from SD Card to email http://stackoverflow.com/questions/587917/trying-to-attach-a-file-from-sd-card-to-email using the Gmail menu context It shows the attachment lets me type who the email is to and edit the body subject. No big..
android: check if a service is running http://stackoverflow.com/questions/600207/android-check-if-a-service-is-running an android activity that toggles the state of the service lets me turn it on if it is off and off if it is on. android service..
iOS / Android cross platform development [duplicate] http://stackoverflow.com/questions/6171128/ios-android-cross-platform-development SDK www.madewithmarmalade.com is a C framework that lets you develop in either Visual Studio or Xcode. It supports both.. the new qHD Android devices. The Particle SDK's UI editor lets you design flexible layouts that scale but also lets you adjust.. lets you design flexible layouts that scale but also lets you adjust the layouts for individual screen sizes. This takes..
http://stackoverflow.com/questions/7156752/multiple-screen-resolution with Views Layouts that have some constant width or height lets say 280dp . Solution is quite simple if we programmatically..
How can I assign an ID to a view programmatically? http://stackoverflow.com/questions/8460680/how-can-i-assign-an-id-to-a-view-programmatically id example For clarity by way of obfuscating example lets examine what happens when there is an id conflict behind the.. orientation horizontal LinearLayout To simulate a conflict lets say our latest build assigned R.id.placeholder @ id placeholder..
Augmented reality - Image size transform http://stackoverflow.com/questions/11387535/augmented-reality-image-size-transform Let us make another assumption to simplify the process. Lets assume that instead of viewing the real arc we view the hypotenuse..
Making resources theme dependent http://stackoverflow.com/questions/12338244/making-resources-theme-dependent other elements found in res values to be Theme dependent. Lets suppose we have two drawables menu icons in this case res drawable..
Reusing views in Android Listview with 2 different layouts http://stackoverflow.com/questions/13297299/reusing-views-in-android-listview-with-2-different-layouts this idea when you need 2 different layouts for the list Lets say its a list of orders and 1 layout is for completed orders..
Android static object lifecycle (Application act crazy) http://stackoverflow.com/questions/1944369/android-static-object-lifecycle-application-act-crazy approach android static share improve this question Lets start with a bit of background What happens when you start an..
set the absolute position of a view in Android http://stackoverflow.com/questions/3294590/set-the-absolute-position-of-a-view-in-android that there is an AbsoluteLayout but it's deprecated... Lets say I have a screen 240x320px and I want to put an ImageView..
Android: Bitmap recycle() how does it work? http://stackoverflow.com/questions/3823799/android-bitmap-recycle-how-does-it-work Bitmap recycle how does it work Lets say i have loaded an image in a bitmap object like Bitmap myBitmap..
Using Global Exception Handling on android http://stackoverflow.com/questions/4427515/using-global-exception-handling-on-android
http://stackoverflow.com/questions/4533440/android-listview-text-color for list item. I try to explain this with a code sample Lets start with ListItems layout save it in your res layout folder..
Android - New Data record is added to the wrong contact http://stackoverflow.com/questions/5151885/android-new-data-record-is-added-to-the-wrong-contact same until there is any contact aggregation taking place. Lets say you add two contacts with same name abc. Here the _ID for..
How to quit android application programmatically http://stackoverflow.com/questions/6330200/how-to-quit-android-application-programmatically more than one activity etc etc but that's not the point. Lets run by some of the use cases You want to let the user quit everything..
How to combine two array list and show in a listview in android http://stackoverflow.com/questions/6383330/how-to-combine-two-array-list-and-show-in-a-listview-in-android sample code to concat two lists. firstname1.addAll first Lets show your data into list view Get a handle to the list view..
Android Convert Px to Dp (Video Aspect Ratio) [duplicate] http://stackoverflow.com/questions/6656540/android-convert-px-to-dp-video-aspect-ratio I'm trying to convert pixels to dp. What is the formula Lets convert 640 and 480 into dp. The docs say this The conversion..
how to Generate Pdf File with Image in android? http://stackoverflow.com/questions/6674059/how-to-generate-pdf-file-with-image-in-android new Paragraph We add one empty line addEmptyLine preface 1 Lets write a big header preface.add new Paragraph Title of the document..
http://stackoverflow.com/questions/6756768/turn-off-screen-on-android turn on and off the display after a certain action happens Lets just worry about turning the screen off for now . From what..
http://stackoverflow.com/questions/7038986/android-custom-listview is called and how many convertView will be created Answer Lets take an example of Efficeint Adapter from ApiDemos . If your..
How to programatically connect 2 android devices with bluetooth? http://stackoverflow.com/questions/7273084/how-to-programatically-connect-2-android-devices-with-bluetooth connect 2 android devices through bluetooth automatically. Lets say they are already paired. Is it possible to achieve that.. on we start the activity which asks the user to enable it. Lets say the user did enable I guess you should check if he did do..
Need a simple tutorial for android/webservice work? http://stackoverflow.com/questions/7520243/need-a-simple-tutorial-for-android-webservice-work So here you get the response from the api. Now Lets make the parser Extend the class with Default Handler public..
http://stackoverflow.com/questions/7797641/android-galleryview-recycling should also downsample the images before you display them. Lets assume that you have a 500x500 pixel image saved under res drawable..
http://stackoverflow.com/questions/8267928/android-rest-client-sample back to the app. Enough of text. Let's see some code now. Lets take a hypothetical REST API URL http myhypotheticalapi.com..
Android: How to do this framing paint? http://stackoverflow.com/questions/9748206/android-how-to-do-this-framing-paint with another image with perfectly color coded regions. Lets call it a MASK for this case. All the skin regions will have..
What is the best IDE to develop Android apps in? [closed] http://stackoverflow.com/questions/1715697/what-is-the-best-ide-to-develop-android-apps-in see why you'd have to learn a new one. Not worth it in my opinion. Plus I'm a big IntelliJ fan. The IntelliJ plugin lets you make apk files and push the app to the emulator that's all you need for Android app development. I'd say you're safe..
How to make a nice looking ListView filter on Android [closed] http://stackoverflow.com/questions/1737009/how-to-make-a-nice-looking-listview-filter-on-android text android maxLines 1 Set height to 0 and let the weight param expand it Note the use of the default ID This lets us use a ListActivity still ListView android id @android id list android layout_width fill_parent android layout_height..
How to programmatically setting style attribute in a view http://stackoverflow.com/questions/2016249/how-to-programmatically-setting-style-attribute-in-a-view or styles . Themes can however be applied programmatically . There is also such a thing as a StateListDrawable which lets you define different drawables for each state the your Button can be in whether focused selected pressed disabled and so..
How to emulate GPS location in the Android Emulator? http://stackoverflow.com/questions/2279647/how-to-emulate-gps-location-in-the-android-emulator share improve this question You can connect to the Emulator via Telnet. You then have a Emulator console that lets you enter certain data like geo fixes network etc. How to use the console is extensively explained here . To connect to..
http://stackoverflow.com/questions/2317428/android-i-want-to-shake-it from the axis and cleaned from static acceleration such as gravity. It will be approx. 0 if there is no movement and lets say 2 if the device is shaked. Notes The accelometer should be deactivated onPause and activated onResume to save resources..
Android ImageButton with a selected state? http://stackoverflow.com/questions/2604599/android-imagebutton-with-a-selected-state now I can get it to change images when pressed but there seems to be no highlighted or selected or similar state which lets me toggle its appearance at will. Here's my XML it only changes appearance when pressed. selector xmlns android http schemas.android.com..
http://stackoverflow.com/questions/3441396/defining-custom-attrs attribute with the same name of a different type. An attr element has two xml attributes name and format . name lets you call it something and this is how you end up referring to it in code e.g. R.attr.my_attribute . The format attribute..
http://stackoverflow.com/questions/3572463/what-is-context-in-android this question Putting it simply As the name suggests its the context of current state of the application object. It lets newly created objects understand what has been going on. Typically you call it to get information regarding another part..
What is the Android UiThread (UI thread) http://stackoverflow.com/questions/3652560/what-is-the-android-uithread-ui-thread are created in this thread and any system calls to those applications are performed in this thread. For instance lets say your application is a single Activity class. Then all of the lifecycle methods and most of your event handling code..
How to set text color of TextView in code? http://stackoverflow.com/questions/4602902/how-to-set-text-color-of-textview-in-code tried it because I had a project open anyway and yes it's nice and red D This is a surprisingly popular question so lets make this answer as complete as possible You can use various functions from the Color class to get the same effect of course...
Why does ContentResolver.requestSync not trigger a sync? http://stackoverflow.com/questions/5253858/why-does-contentresolver-requestsync-not-trigger-a-sync in a second. exported makes it visible to other components needed so ContentResolver can call it . The intent filter lets it catch an intent requesting sync. This intent comes from ContentResolver when you call your RequestSync function. 2. Provide..
How can I get root permissions through the Android SDK? http://stackoverflow.com/questions/5293615/how-can-i-get-root-permissions-through-the-android-sdk What you need to do is something like Process root Runtime.getRuntime .exec su That causes SuperUser to show which lets you either Allow or Block it from root access. This approach might not work if the user is not rooted. Here is a way you..
Trying to attach a file from SD Card to email http://stackoverflow.com/questions/587917/trying-to-attach-a-file-from-sd-card-to-email Intent.createChooser sendIntent Email So if I launch using the Gmail menu context It shows the attachment lets me type who the email is to and edit the body subject. No big deal. I hit send and it sends. The only thing is the attachment..
android: check if a service is running http://stackoverflow.com/questions/600207/android-check-if-a-service-is-running I check if a background service on Android is running I want an android activity that toggles the state of the service lets me turn it on if it is off and off if it is on. android service share improve this question I had the same problem not..
iOS / Android cross platform development [duplicate] http://stackoverflow.com/questions/6171128/ios-android-cross-platform-development officially support the Particle SDK platform. Source The Airplay SDK www.madewithmarmalade.com is a C framework that lets you develop in either Visual Studio or Xcode. It supports both 2D and 3D graphics. Airplay targets iOS Android Bada Symbian.. when going from a 4 3 screen like the iPhone to a 16 9 like the new qHD Android devices. The Particle SDK's UI editor lets you design flexible layouts that scale but also lets you adjust the layouts for individual screen sizes. This takes a little.. 9 like the new qHD Android devices. The Particle SDK's UI editor lets you design flexible layouts that scale but also lets you adjust the layouts for individual screen sizes. This takes a little more time but lets you make the app look custom..
http://stackoverflow.com/questions/7156752/multiple-screen-resolution at run time in terms of Percentage The Problem occurs only with Views Layouts that have some constant width or height lets say 280dp . Solution is quite simple if we programmatically set Layout Params of our Views Layouts in terms of Percentage..
How can I assign an ID to a view programmatically? http://stackoverflow.com/questions/8460680/how-can-i-assign-an-id-to-a-view-programmatically the custom id myViewGroup.setId R.id.reservedNamedId Conflicting id example For clarity by way of obfuscating example lets examine what happens when there is an id conflict behind the scenes. layout mylayout.xml xml version 1.0 encoding utf 8.. fill_parent android layout_height wrap_content android orientation horizontal LinearLayout To simulate a conflict lets say our latest build assigned R.id.placeholder @ id placeholder an int value of 12 .. Next MyActivity.java defines some..
Augmented reality - Image size transform http://stackoverflow.com/questions/11387535/augmented-reality-image-size-transform of the view is the arclength of the viewport Step 3 Some Math Let us make another assumption to simplify the process. Lets assume that instead of viewing the real arc we view the hypotenuse of the viewport. When looking from a distance d with..
Making resources theme dependent http://stackoverflow.com/questions/12338244/making-resources-theme-dependent There's a way do define android drawables and many other elements found in res values to be Theme dependent. Lets suppose we have two drawables menu icons in this case res drawable ic_search_light.png res drawable ic_search_dark.png And..
Reusing views in Android Listview with 2 different layouts http://stackoverflow.com/questions/13297299/reusing-views-in-android-listview-with-2-different-layouts if convertView is null or not. However how can you implement this idea when you need 2 different layouts for the list Lets say its a list of orders and 1 layout is for completed orders and the other layout is for in process orders. This is an..
Android static object lifecycle (Application act crazy) http://stackoverflow.com/questions/1944369/android-static-object-lifecycle-application-act-crazy suggest holding static object via singleton method is better approach android static share improve this question Lets start with a bit of background What happens when you start an application The OS starts a process and assigns it a unique..
set the absolute position of a view in Android http://stackoverflow.com/questions/3294590/set-the-absolute-position-of-a-view-in-android to set the absolute position of a view in android I know that there is an AbsoluteLayout but it's deprecated... Lets say I have a screen 240x320px and I want to put an ImageView which is 20x20px with its center at the position 100 100 ...
Android: Bitmap recycle() how does it work? http://stackoverflow.com/questions/3823799/android-bitmap-recycle-how-does-it-work Bitmap recycle how does it work Lets say i have loaded an image in a bitmap object like Bitmap myBitmap BitmapFactory.decodeFile myFile Now what will happen..
Using Global Exception Handling on android http://stackoverflow.com/questions/4427515/using-global-exception-handling-on-android
http://stackoverflow.com/questions/4533440/android-listview-text-color be passed or inflated in case you are using complex layout for list item. I try to explain this with a code sample Lets start with ListItems layout save it in your res layout folder of you android project with say list_black_text.xml xml version..
Android - New Data record is added to the wrong contact http://stackoverflow.com/questions/5151885/android-new-data-record-is-added-to-the-wrong-contact of the contacts is _ID for contacts raw contacts remains same until there is any contact aggregation taking place. Lets say you add two contacts with same name abc. Here the _ID for raw contacts increments twice while _ID for contacts increments..
How to quit android application programmatically http://stackoverflow.com/questions/6330200/how-to-quit-android-application-programmatically anything with quitting is finish . Obviously you can have more than one activity etc etc but that's not the point. Lets run by some of the use cases You want to let the user quit everything because of memory usage and not running in the background..
How to combine two array list and show in a listview in android http://stackoverflow.com/questions/6383330/how-to-combine-two-array-list-and-show-in-a-listview-in-android all elements other collection java arraylist example for sample code to concat two lists. firstname1.addAll first Lets show your data into list view Get a handle to the list view ListView lv ListView findViewById R.id.custom_list_view lv.setAdapter..
Android Convert Px to Dp (Video Aspect Ratio) [duplicate] http://stackoverflow.com/questions/6656540/android-convert-px-to-dp-video-aspect-ratio Possible Duplicate converting pixels to dp in android I'm trying to convert pixels to dp. What is the formula Lets convert 640 and 480 into dp. The docs say this The conversion of dp units to screen pixels is simple px dp dpi 160 But I..
how to Generate Pdf File with Image in android? http://stackoverflow.com/questions/6674059/how-to-generate-pdf-file-with-image-in-android document throws DocumentException Paragraph preface new Paragraph We add one empty line addEmptyLine preface 1 Lets write a big header preface.add new Paragraph Title of the document catFont addEmptyLine preface 1 Will create Report generated..
http://stackoverflow.com/questions/6756768/turn-off-screen-on-android off screen on Android I am trying to turn on and off the display after a certain action happens Lets just worry about turning the screen off for now . From what I understand from wake lock this is what I have PowerManager..
http://stackoverflow.com/questions/7038986/android-custom-listview be attached to Edited Question How many times getView is called and how many convertView will be created Answer Lets take an example of Efficeint Adapter from ApiDemos . If your screen showing 10 Rows then convertView Count 10 1 11 10 Rows..
How to programatically connect 2 android devices with bluetooth? http://stackoverflow.com/questions/7273084/how-to-programatically-connect-2-android-devices-with-bluetooth with bluetooth I am developing an application which should connect 2 android devices through bluetooth automatically. Lets say they are already paired. Is it possible to achieve that Would be grateful for any replies android bluetooth connection.. enableBtIntent request_code_for_enabling_bt If its not on we start the activity which asks the user to enable it. Lets say the user did enable I guess you should check if he did do it in your onActivityResult method We can query for the paired..
Need a simple tutorial for android/webservice work? http://stackoverflow.com/questions/7520243/need-a-simple-tutorial-for-android-webservice-work Response res new Response your_url String getResponse res.getResponse So here you get the response from the api. Now Lets make the parser Extend the class with Default Handler public class XMLParser extends DefaultHandler You must have basic..
http://stackoverflow.com/questions/7797641/android-galleryview-recycling but first make sure its the proper view type. Update You should also downsample the images before you display them. Lets assume that you have a 500x500 pixel image saved under res drawable but the image is only going to take up 125x125 pixels..
http://stackoverflow.com/questions/8267928/android-rest-client-sample mechanism to communicate the result of the AsyncTask s back to the app. Enough of text. Let's see some code now. Lets take a hypothetical REST API URL http myhypotheticalapi.com user profile The top layer might look like this Entry point..
Android: How to do this framing paint? http://stackoverflow.com/questions/9748206/android-how-to-do-this-framing-paint on the hand of the OUTLINE That click location will be checked with another image with perfectly color coded regions. Lets call it a MASK for this case. All the skin regions will have the same color. The shirt areas will be another color. Wherever..
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