Group items tagged

5 down vote accepted One solution is to implement an OnScrollListener and make changes (like adding items, etc.) to the ListAdapter at a convenient state in its onScrollStateChanged method. The following ListActivity shows a list of integers, starting with 40, adding 10 per scroll-stop.

public class Test extends ListActivity implements OnScrollListener {    Aleph0 adapter = new Aleph0();    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setListAdapter(adapter);         getListView().setOnScrollListener(this);    }    public void onScroll(AbsListView v, int i, int j, int k) { }    public void onScrollStateChanged(AbsListView v, int state) {        if(state == OnScrollListener.SCROLL_STATE_IDLE) {                adapter.count += 10;                adapter.notifyDataSetChanged();        }    }    class Aleph0 extends BaseAdapter {        int count = 40;        public int getCount() { return count; }        public Object getItem(int pos) { return pos; }        public long getItemId(int pos) { return pos; }        public View getView(int pos, View v, ViewGroup p) {                TextView view = new TextView(Test.this);                view.setText("entry " + pos);                return view;        }    }}

You should obviously use separate threads for long running actions (like loading web-data) and might want to indicate progress in the last list item (like the market or gmail apps do).

I am just trying to display a list from an array that I have in my arrays.xml.

String[] testArray = getResources().getStringArray(R.array.testArray); /** Called when the activity is first created. */ @Override protected void onCreate(Bundle savedInstanceState)

You can't initialize your testArray field this way, because the application resources still aren't ready.

This article describes a technique you can use to find out whether the system contains any application capable of responding to the intent you want to use. The example below shows a helper method that queries the system package manager to determine whether there's an app that can respond to a specified intent. Your application can pass an intent to the method and then, for example, show or hide user options that the user would normally use to trigger the intent.

/** * Indicates whether the specified action can be used as an intent. This * method queries the package manager for installed packages that can * respond to an intent with the specified action. If no suitable package is * found, this method returns false. * * @param context The application's environment. * @param action The Intent action to check for availability. * * @return True if an Intent with the specified action can be sent and *         responded to, false otherwise. */public static boolean isIntentAvailable(Context context, String action) {    final PackageManager packageManager = context.getPackageManager();    final Intent intent = new Intent(action);    List<ResolveInfo> list =            packageManager.queryIntentActivities(intent,                    PackageManager.MATCH_DEFAULT_ONLY);    return list.size() > 0;}

@Overridepublic boolean onPrepareOptionsMenu(Menu menu) {    final boolean scanAvailable = isIntentAvailable(this,        "com.google.zxing.client.android.SCAN");    MenuItem item;    item = menu.findItem(R.id.menu_item_add);    item.setEnabled(scanAvailable);    return super.onPrepareOptionsMenu(menu);}

A bunch of sample apps for Android. Simple workarounds and examples for doing things on Android. Custom Progress Bar - A customized Progress Bar for android with your own animation Drag and Drop widgets on Android Ongoing notifications on Android HTML with images in a Text View Custom Expandable List Views on Android Custom List View - Phonebook Example Custom Title Bar Android WebView, Javascrip and CSS Unzip files on Android

Getting Started Welcome to Training for Android developers. Here you'll find sets of lessons within classes that describe how to accomplish a specific task with code samples you can re-use in your app. Classes are organized into several groups you can see at the top-level of the left navigation. This first group, Getting Started, teaches you the bare essentials for Android app development. If you're a new Android app developer, you should complete each of these classes in order:

An AppWidgetProvider is a BroadcastReceiver. That gives you two possibilities right off the bat: 1. Have it also handle whatever other Intents you were planning on setting up with a separate BroadcastReceiver, or 2. Send an Intent from whatever component you want to the AppWidgetProvider. In other words, don't worry about trying to talk directly to the app widget (which I suspect is impossible) -- just talk to your code that already talks to the app widget.

I update my widget from within my app, when I delete/add entries to a list. To do this, I have a method (updateWidget) and a static String (UPDATE_ACTION). My updateWidget() method sends a broadcast which is received by the widget class and then calls onUpdate() with the appropriate params: private void updateWidget() {                 Intent i = new Intent(this, TVWidget.class);                 i.setAction(TVWidget.UPDATE_ACTION);                 sendBroadcast(i);         } In TVWidget class: @Override         public void onReceive(Context context, Intent intent) {                 String action = intent.getAction();                 if (action != null && action.equals(UPDATE_ACTION)) {                         final AppWidgetManager manager = AppWidgetManager.getInstance (context);                         onUpdate(context, manager,                                         manager.getAppWidgetIds(new ComponentName(                                                         context, TVWidget.class)                                         )                         );                 }                 else {                         super.onReceive(context, intent);                 }         } This seems to work fine.

These applications use an OnScrollListener to detect when the last item is displayed. When this happens, they load more items and add them to the list adapter.

Create a new file (as root) sudo gedit /etc/udev/rules.d/50-android.rules with the following content SUBSYSTEM=="usb", SYSFS{idVendor}=="0bb4", MODE="0666" Make sure that the text after {idVendor} is the same as the device id found when using the lsusb command. Save and exit the editor To make execution of the rule possible, perform a chmod sudo chmod a+rx /etc/udev/rules.d/50-android.rules To make the rule active, restart udev sudo /etc/init.d/udev restart

You can perform a check, to see that the Android Dev Phone is shared with Ubuntu, by opening a Terminal (inside Ubuntu. Open a VMWare Remote Console to make use of the Ubuntu) and type the following command lsusb A list of USB devices will be shown. For example: Bus 002 Device 001: ID ld6b:0001 Linux Foundation 1.1 root hub Bus 001 Device 004: ID 0bb4:0c02 High Tech Computer Corp. Bus 001 Device 001: ID ld6b:0002 Linux Foundation 2.0 root hub

1. you can look at the video from Google IO conference 2009, called Turbo charging your UI's by Romain Guy; he discussed some of the optimizations you can do when working with ListViews. 2. You can read Mark Murphy's series of ListView tutorials at android guys titled Fancy ListViews: http://www.google.co.in/url?sa=t&source=web&ct=res&cd=4&ved=0CBYQFjAD...

Spinner s2 = (Spinner) findViewById(R.id.spinner2);Cursor cur = managedQuery(People.CONTENT_URI, PROJECTION, null, null);     SimpleCursorAdapter adapter2 = new SimpleCursorAdapter(this,    android.R.layout.simple_spinner_item, // Use a template                                          // that displays a                                          // text view    cur, // Give the cursor to the list adatper    new String[] {People.NAME}, // Map the NAME column in the                                         // people database to...    new int[] {android.R.id.text1}); // The "text1" view defined in                                     // the XML template                                         adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);s2.setAdapter(adapter2);

But in practice, you will notice that the AsyncTask is limited to 10 threads. This number is hardcoded somewhere in the Android SDK so we cannot change this. In this case it’s a limitation we cannot live with, because often more than 10 images are loaded at the same time.

I’ve shown you how to improve performance of a ListView in three different ways: By loading images in a seperate thread By reusing rows in the list By caching views within a row

google最后给的判决书： Hi, After further review from our abuse team we have confirmed that your account that was closed was modifying the ad behavior which is strictly prohibited as stated in the AdSense policies. These types of violations pose a significant risk to advertisers and for this reason we can no longer work with you through any partnering AdSense account or product offering. This will be the final communication about this issue. Please do not reply to this email as you will not receive a response. Thank you for your understanding. Google AdSense 我们自始至终都不知道原因。

我Google了下 "modifying the ad behavior " 就是指你修改了 Google提供的 adsense js code 或者 sdk 唯一有可能的就是这里了 GoogleAdView adView = (GoogleAdView) activity.findViewById(R.id.ad<http://r.id.ad/> ); if (adView != null) { View vc = adView.getCurrentView(); if (vc instanceof WebView) { ((WebView) vc).destroy(); } View vn = adView.getNextView(); if (vn instanceof WebView) { ((WebView) vn).destroy(); } } 因为用了adsense之后 我们的程序老是crash 从stack trace看是因为Google adsense sdk 引起的. 资源没有释放. 然后去Adsense的那个mail list AFMA 问了 碰到2个都有同样问题的 然后有人给了个code 因为adsense sdk没有destroy ad view  所以要手动destroy下 我们就在每个有ads的activty的 onDestroy 加上这段 就好了 程序没有crash了 结果就被搞了 连负责我们android adsense sales都事先不知道 adsense team就直接把我们封了 还在beta 测试阶段的东西 还有bug  我们只是加了这个保证他资源正常释放不会影响到我们程序 结果就挂了 而且Google的态度巨NX无比 连个申述的途径都没有  只是给了个link类似事后调查

我刚刚给我的sale发了一封信： Hi Sunil, It has been long that I haven't talked to you. I have a question, when I went to the application register page, I found the page layout was changed and some of my apps were gone. For example UK TV Guide, Australia TV Guide, etc. Also, the published status are all "false". I am confused because I am still seeing my ads are clicked in the daily report. Is there anything wrong? I am nervous because I just knew that an AdSense developer's account was disabled without any warning,  and the developers themselves don't know the reason. I don't want that happened on me so I really appreciate your comment. below is the letter in AFMA group. Looking forward to your reply. Thanks. Cheers, Luke 接下来我引用了superdroid的信。看看他怎么说吧。

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MergeAdapter accepts a mix of Adapters and Views and presents them as one contiguous whole to whatever ListView it is poured into. This is good for cases where you have multiple data sources, or if you have a handful of ordinary Views to mix in with lists of data, or the like.