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2014/10/16 ¤W¤È 08:13:19
android Programming Glossary: explanationAndroid - what's the difference between the various methods to get a Context? http://stackoverflow.com/questions/1026973/android-whats-the-difference-between-the-various-methods-to-get-a-context mContext getBaseContext However I can't find any decent explanation of which is preferable and under what circumstances which should..
Jelly Bean DatePickerDialog — is there a way to cancel? http://stackoverflow.com/questions/11444238/jelly-bean-datepickerdialog-is-there-a-way-to-cancel this as a duplicate since i think I provided a much better explanation of the issue. I'm not sure if I should edit the other question..
Bitmap recycle with largeHeap enabled http://stackoverflow.com/questions/12716574/bitmap-recycle-with-largeheap-enabled and decodeSampledBitmapFromResource given in the explanation of docs. Calculating how much we need to scale the image First..
http://stackoverflow.com/questions/16789676/caching-images-and-displaying down below. Please go through these answers for a detailed explanation as well as implementation of Lazy loading. My apologies for..
BitmapFactory OOM driving me nuts http://stackoverflow.com/questions/1955410/bitmapfactory-oom-driving-me-nuts using BitmapFactory . Anyone have any ideas on this or an explanation as to why VM won't allocate 614KB when there's 1.6MB of free..
Android: How to create a Dialog without a title? http://stackoverflow.com/questions/2644134/android-how-to-create-a-dialog-without-a-title question You need to use an AlertDialog . There's a good explanation on the Android Developer's site about custom dialogs . In very..
How to Read MMS Data in Android? http://stackoverflow.com/questions/3012287/how-to-read-mms-data-in-android using either content sms or content mms . date no explanation needed. thread_id is the ID of the conversation body The content..
onActivityResult() called prematurely http://stackoverflow.com/questions/3354955/onactivityresult-called-prematurely the activity is finished. While this behavior has certain explanation only one singleTask activity can exist and there can happen..
How to Define Callbacks in Android? http://stackoverflow.com/questions/3398363/how-to-define-callbacks-in-android to implement it and I haven't been able to find a suitable explanation for android online yet. The only way I've implemented callbacks..
How can I put a ListView into a ScrollView without it collapsing? http://stackoverflow.com/questions/3495890/how-can-i-put-a-listview-into-a-scrollview-without-it-collapsing a ListView into a ScrollView . I have yet to see any real explanation for why though. The only reason I can seem to find is that Google..
http://stackoverflow.com/questions/5120185/android-sleep-standby-mode so I'm not asking for help for once I just want an explanation to better understand this. My question is what exactly does..
Android remove space between tabs in tabwidget http://stackoverflow.com/questions/5799320/android-remove-space-between-tabs-in-tabwidget web. For example this one by Josh is short and has a nice explanation. Update Here I share a small sample of tabwidget using custom..
http://stackoverflow.com/questions/6218143/android-post-json-using-http I'm looking for a step by step process with code and explanation of why you do each step or of what that step does. It doesn't.. out there I'm just really looking for an example with an explanation of what exactly is happening and why it is done that way. If..
How to use Accelerometer to measure distance for Android Application Development http://stackoverflow.com/questions/6352681/how-to-use-accelerometer-to-measure-distance-for-android-application-development error is horrible. It is useless in practice. Here is an explanation why Google Tech Talk at 23 20. I highly recommend this video...
Android: How to declare global variables? http://stackoverflow.com/questions/708012/android-how-to-declare-global-variables use of concepts best explained in this StackExchange explanation of the Singleton design pattern so that I do not have to define.. of state. For a list of the differences see the Singleton explanation link above. Diane continues ...just likely to be something you..
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 parent int type getItemViewType position phase 1 see my explanation if convertView null if type 0 setup your common item view inflate.. view inflate it and set to convertView phase 2 see my explanation if type 0 set the state of the common item view based on the..
Android accelerometer accuracy (Inertial navigation) http://stackoverflow.com/questions/7829097/android-accelerometer-accuracy-inertial-navigation error is horrible. It is useless in practice. Here is an explanation why Google Tech Talk at 23 20 . I highly recommend this video...
http://stackoverflow.com/questions/10482057/android-camera-surface-view uses permission android name android.permission.CAMERA Explanation SurfaceView is a type of View which contains a SurfaceHolder...
http://stackoverflow.com/questions/10812552/heterogeneous-gridlayout Button LinearLayout LinearLayout LinearLayout Solution 1 Explanation The key to LinearLayouts is to define your imperatives as separate..
http://stackoverflow.com/questions/12319809/application-error-the-connection-to-the-server-was-unsuccessful-file-andr this line super.loadUrl file android_asset www index.html Explanation This can be happened due to the following reasons The core reason..
How to stop an activity in android using intent? http://stackoverflow.com/questions/14411477/how-to-stop-an-activity-in-android-using-intent .getBoolean keep if keep false B.this.finish Explanation What this basically does is when the checkbox is checked it..
Maintain keyboard open/closed state for EditText when app comes to foreground http://stackoverflow.com/questions/15202895/maintain-keyboard-open-closed-state-for-edittext-when-app-comes-to-foreground break default break super.onResume Explanation Here I used two flags flag2 and flag . flag2 preserves the keyboardstate..
Draw in Canvas by finger android http://stackoverflow.com/questions/16650419/draw-in-canvas-by-finger-android touch_up invalidate break return true Snap shot Explanation You are creating a view class then extends View. You override..
Displaying Contact Number and Contact Name in a custom list view http://stackoverflow.com/questions/17256932/displaying-contact-number-and-contact-name-in-a-custom-list-view true android text Select RelativeLayout Explanation The above uses a Custom Adapter. A custom layout row.xml with..
Android: Get Selected Item Using Checkbox in Listview when I click a Button http://stackoverflow.com/questions/18162931/android-get-selected-item-using-checkbox-in-listview-when-i-click-a-button below. Make only changes as below. Keep the rest the same. Explanation and discussion on the topic @ https groups.google.com forum..
Inside OnClickListener I cannot access a lot of things - how to approach? http://stackoverflow.com/questions/2076037/inside-onclicklistener-i-cannot-access-a-lot-of-things-how-to-approach MyActivity is the class name of your Activity subclass. Explanation You are creating an anonymous inner class when you use this..
How to get current memory usage in android? http://stackoverflow.com/questions/3170691/how-to-get-current-memory-usage-in-android mi long availableMegs mi.availMem 1048576L Explanation of the number 1048576 1024 bytes 1 kilobyte 1024 kilobytes 1..
Android: java.lang.SecurityException: Permission Denial: start Intent http://stackoverflow.com/questions/4162447/android-java-lang-securityexception-permission-denial-start-intent Remove the second one and you should be good to go. More Explanation You may be declared the activity 2 times in the manifest with..
How to change the Spinner font color? http://stackoverflow.com/questions/4361604/how-to-change-the-spinner-font-color new CustomArrayAdapter CharSequence this spin_arry Explanation Because CustomArrayAdapter knows that we use android's built..
android maps circle overlay, dynamically change radius? http://stackoverflow.com/questions/5722490/android-maps-circle-overlay-dynamically-change-radius radius paint2 canvas.drawCircle pt.x pt.y radius paint1 Explanation the documentation states that for each zoomLevel the map doubles..
How to generate Key Hash for facebook SDK In Mac http://stackoverflow.com/questions/6661993/how-to-generate-key-hash-for-facebook-sdk-in-mac to create certificates etc that is included in the jre. Explanation for how to deal with the keys and hash here http developers.facebook.com..
Show my Layout while SurfaceView is loading Camera Preview http://stackoverflow.com/questions/7119164/show-my-layout-while-surfaceview-is-loading-camera-preview android layout_height wrap_content android text Explanation Txt TextView RelativeLayout RelativeLayout android id @ id footer.. android layout_height wrap_content android text Explanation Txt TextView RelativeLayout RelativeLayout android id @ id surface_camera..
http://stackoverflow.com/questions/7947165/admob-implementation-error the pitfalls below to learn why this may cause trouble. Explanation The build target and the uses sdk elements have completely different..
Android - what's the difference between the various methods to get a Context? http://stackoverflow.com/questions/1026973/android-whats-the-difference-between-the-various-methods-to-get-a-context since Activity extends Context mContext getApplicationContext mContext getBaseContext However I can't find any decent explanation of which is preferable and under what circumstances which should be used. Pointers to documentation on this and guidance..
Jelly Bean DatePickerDialog — is there a way to cancel? http://stackoverflow.com/questions/11444238/jelly-bean-datepickerdialog-is-there-a-way-to-cancel here . But I'm not sure if it's appropriate to close this as a duplicate since i think I provided a much better explanation of the issue. I'm not sure if I should edit the other question and paste this content there but I'm not comfortable changing..
Bitmap recycle with largeHeap enabled http://stackoverflow.com/questions/12716574/bitmap-recycle-with-largeheap-enabled the size of your device and scale it using calculateInSampleSize and decodeSampledBitmapFromResource given in the explanation of docs. Calculating how much we need to scale the image First way if imageHeight reqHeight imageWidth reqWidth if imageWidth..
http://stackoverflow.com/questions/16789676/caching-images-and-displaying Tutorial and the concept knowledge shared by Raghunandan down below. Please go through these answers for a detailed explanation as well as implementation of Lazy loading. My apologies for not being able to reward an answer with bounty as i was away..
BitmapFactory OOM driving me nuts http://stackoverflow.com/questions/1955410/bitmapfactory-oom-driving-me-nuts I'm thinking the only way around this is to somehow avoid using BitmapFactory . Anyone have any ideas on this or an explanation as to why VM won't allocate 614KB when there's 1.6MB of free memory android oom share improve this question Note that..
Android: How to create a Dialog without a title? http://stackoverflow.com/questions/2644134/android-how-to-create-a-dialog-without-a-title layout. android android layout dialog share improve this question You need to use an AlertDialog . There's a good explanation on the Android Developer's site about custom dialogs . In very short summary you do this with code like copied below from..
How to Read MMS Data in Android? http://stackoverflow.com/questions/3012287/how-to-read-mms-data-in-android Not really. This ID can be used to retrieve detailed information using either content sms or content mms . date no explanation needed. thread_id is the ID of the conversation body The content of the last SMS on this conversation. If it's an MMS even..
onActivityResult() called prematurely http://stackoverflow.com/questions/3354955/onactivityresult-called-prematurely everything works as expected result is reported only after the activity is finished. While this behavior has certain explanation only one singleTask activity can exist and there can happen multiple waiters for it this is still a not logical restriction..
How to Define Callbacks in Android? http://stackoverflow.com/questions/3398363/how-to-define-callbacks-in-android after a certain event has happened but I don't know how to implement it and I haven't been able to find a suitable explanation for android online yet. The only way I've implemented callbacks so far have been overriding various methods onActivityResult..
How can I put a ListView into a ScrollView without it collapsing? http://stackoverflow.com/questions/3495890/how-can-i-put-a-listview-into-a-scrollview-without-it-collapsing problem and the only answer I can find seems to be don't put a ListView into a ScrollView . I have yet to see any real explanation for why though. The only reason I can seem to find is that Google doesn't think you should want to do that. Well I do so..
http://stackoverflow.com/questions/5120185/android-sleep-standby-mode 1 or the emulator. I'm sure the workaround isn't too difficult so I'm not asking for help for once I just want an explanation to better understand this. My question is what exactly does sleep mode do on android systems What does it stop what doesn't..
Android remove space between tabs in tabwidget http://stackoverflow.com/questions/5799320/android-remove-space-between-tabs-in-tabwidget to customize your tabs there are a lot of tutorials on the web. For example this one by Josh is short and has a nice explanation. Update Here I share a small sample of tabwidget using custom tabs based on your code to achieve the following output What..
http://stackoverflow.com/questions/6218143/android-post-json-using-http out there but could someone point me to an actual tutorial I'm looking for a step by step process with code and explanation of why you do each step or of what that step does. It doesn't need to be a complex simple will suffice. Again I know there.. simple will suffice. Again I know there are a ton of examples out there I'm just really looking for an example with an explanation of what exactly is happening and why it is done that way. If anyone knows of a good Android book that deals with this please..
How to use Accelerometer to measure distance for Android Application Development http://stackoverflow.com/questions/6352681/how-to-use-accelerometer-to-measure-distance-for-android-application-development position by integrating the linear acceleration twice but the error is horrible. It is useless in practice. Here is an explanation why Google Tech Talk at 23 20. I highly recommend this video. Similar questions track small movements of iphone with no..
Android: How to declare global variables? http://stackoverflow.com/questions/708012/android-how-to-declare-global-variables over Application subclasses. In my disagreement I will be making use of concepts best explained in this StackExchange explanation of the Singleton design pattern so that I do not have to define terms in this answer. I highly encourage skimming the link.. for state which is very different from a Singleton holder of state. For a list of the differences see the Singleton explanation link above. Diane continues ...just likely to be something you regret in the future as you find your Application object..
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 void View getView int position View convertView ViewGroup parent int type getItemViewType position phase 1 see my explanation if convertView null if type 0 setup your common item view inflate it and set to convertView else setup separator view.. view inflate it and set to convertView else setup separator view inflate it and set to convertView phase 2 see my explanation if type 0 set the state of the common item view based on the position rely on the fact that convertView contains the view..
Android accelerometer accuracy (Inertial navigation) http://stackoverflow.com/questions/7829097/android-accelerometer-accuracy-inertial-navigation position by integrating the linear acceleration twice but the error is horrible. It is useless in practice. Here is an explanation why Google Tech Talk at 23 20 . I highly recommend this video. It is not the accelerometer noise that causes the problem..
http://stackoverflow.com/questions/10482057/android-camera-surface-view ob1 in your manifest file copy this code for camera permission uses permission android name android.permission.CAMERA Explanation SurfaceView is a type of View which contains a SurfaceHolder. SurfaceHolder holds the surface on which we can display our..
http://stackoverflow.com/questions/10812552/heterogeneous-gridlayout layout_height 0dp android layout_weight 1 android text Button LinearLayout LinearLayout LinearLayout Solution 1 Explanation The key to LinearLayouts is to define your imperatives as separate Layouts and nest the others in them. As you apply constraints..
http://stackoverflow.com/questions/12319809/application-error-the-connection-to-the-server-was-unsuccessful-file-andr file inside src com yourProj youractivity.java above this line super.loadUrl file android_asset www index.html Explanation This can be happened due to the following reasons The core reason the problem is likely due to the speed of the emulator..
How to stop an activity in android using intent? http://stackoverflow.com/questions/14411477/how-to-stop-an-activity-in-android-using-intent Intent intent super.onNewIntent intent keep intent.getExtras .getBoolean keep if keep false B.this.finish Explanation What this basically does is when the checkbox is checked it calls the activity and passes a boolean value if it's true the..
Maintain keyboard open/closed state for EditText when app comes to foreground http://stackoverflow.com/questions/15202895/maintain-keyboard-open-closed-state-for-edittext-when-app-comes-to-foreground 1 getWindow .setSoftInputMode WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN break default break super.onResume Explanation Here I used two flags flag2 and flag . flag2 preserves the keyboardstate and flag preserves whether the application goes..
Draw in Canvas by finger android http://stackoverflow.com/questions/16650419/draw-in-canvas-by-finger-android touch_move x y invalidate break case MotionEvent.ACTION_UP touch_up invalidate break return true Snap shot Explanation You are creating a view class then extends View. You override the onDraw . You add the path of where finger touches and..
Displaying Contact Number and Contact Name in a custom list view http://stackoverflow.com/questions/17256932/displaying-contact-number-and-contact-name-in-a-custom-list-view android layout_alignParentBottom true android layout_centerHorizontal true android text Select RelativeLayout Explanation The above uses a Custom Adapter. A custom layout row.xml with 2 textviews and one checkbox is inflated for each row. getAllContacts..
Android: Get Selected Item Using Checkbox in Listview when I click a Button http://stackoverflow.com/questions/18162931/android-get-selected-item-using-checkbox-in-listview-when-i-click-a-button Using Checkbox in Listview when I click a Button . Try the below. Make only changes as below. Keep the rest the same. Explanation and discussion on the topic @ https groups.google.com forum fromgroups# topic android developers No0LrgJ6q2M MainActivity.java..
Inside OnClickListener I cannot access a lot of things - how to approach? http://stackoverflow.com/questions/2076037/inside-onclicklistener-i-cannot-access-a-lot-of-things-how-to-approach Replace this in your code with MyActivity.this where MyActivity is the class name of your Activity subclass. Explanation You are creating an anonymous inner class when you use this part of your code new OnClickListener Anonymous inner classes..
How to get current memory usage in android? http://stackoverflow.com/questions/3170691/how-to-get-current-memory-usage-in-android getSystemService ACTIVITY_SERVICE activityManager.getMemoryInfo mi long availableMegs mi.availMem 1048576L Explanation of the number 1048576 1024 bytes 1 kilobyte 1024 kilobytes 1 megabyte 1024 1024 1048576 It's quite obvious that the number..
Android: java.lang.SecurityException: Permission Denial: start Intent http://stackoverflow.com/questions/4162447/android-java-lang-securityexception-permission-denial-start-intent because you may enter two entries pointing to same activity. Remove the second one and you should be good to go. More Explanation You may be declared the activity 2 times in the manifest with different properties like activity android name .myclass activity..
How to change the Spinner font color? http://stackoverflow.com/questions/4361604/how-to-change-the-spinner-font-color getResources .getStringArray R.array.Planets this.mAdapter new CustomArrayAdapter CharSequence this spin_arry Explanation Because CustomArrayAdapter knows that we use android's built in layout resource it also knows that text will be placed in..
android maps circle overlay, dynamically change radius? http://stackoverflow.com/questions/5722490/android-maps-circle-overlay-dynamically-change-radius 25 radius canvas.getHeight 25 canvas.drawCircle pt.x pt.y radius paint2 canvas.drawCircle pt.x pt.y radius paint1 Explanation the documentation states that for each zoomLevel the map doubles or halves the size so as long as the radius is doubling..
How to generate Key Hash for facebook SDK In Mac http://stackoverflow.com/questions/6661993/how-to-generate-key-hash-for-facebook-sdk-in-mac a Facebook app. If you want the keytool that you can use to create certificates etc that is included in the jre. Explanation for how to deal with the keys and hash here http developers.facebook.com docs guides mobile #android share improve this..
Show my Layout while SurfaceView is loading Camera Preview http://stackoverflow.com/questions/7119164/show-my-layout-while-surfaceview-is-loading-camera-preview layout_height wrap_content TextView android layout_width wrap_content android layout_height wrap_content android text Explanation Txt TextView RelativeLayout RelativeLayout android id @ id footer android layout_width fill_parent android layout_height.. true TextView android layout_width wrap_content android layout_height wrap_content android text Explanation Txt TextView RelativeLayout RelativeLayout android id @ id surface_camera android layout_width fill_parent android layout_height..
http://stackoverflow.com/questions/7947165/admob-implementation-error required to the uses sdk element in the AndroidManifest. Read the pitfalls below to learn why this may cause trouble. Explanation The build target and the uses sdk elements have completely different scopes. The build target is evaluated only at build..
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