You don&#39;t need to re-install to get a &#39;clean install&#39;, you can just wipe the application&#39;s data.

Go to Settings &gt; Applications &gt; Find your app and use &#39;clear data&#39; (or similar). At that point your app won&#39;t know the difference unless you are also using files on the SD card.

And, of course, app updating can be tested by installing normally (or, with adb, you can use `adb install -r` for installing while keeping the app&#39;s data, as you would on the market or with an APK)

Let&#39;s say I have this code in Java:

    HashSet&lt;String&gt; wordSet = new HashSet&lt;String&gt;();
    String a = &quot;hello&quot;;
    String b = &quot;hello&quot;;
    wordSet.add(a);

Would `wordSet.contains(b);` return `true` or `false`? From what I understand, `a` and `b` refer to different objects even though their values are the same. So `contains()` should return `false`. However, when I run this code, it returns `true`. **Will it always return `true` no matter where String object `b` is coming from as long as `b` contains the value `&quot;hello&quot;`? Am I guaranteed this always?** If not, when am I not guaranteed this? And what if I wanted to do something similar with objects other than Strings?

Would a Java HashSet&lt;String&gt;&#39;s contains() method test equality of the strings or object identity?

I&#39;m using XCode 4.2 and have built my UI using Storyboards. I need to create a view that has content above and below a UITableView and I can achieve this by using a UIViewController.  A UITableViewController does not let you add content above or below the table.  You can use the table header/footer but that doesn&#39;t work for what I would like to achieve.

I now have a UIViewController with a UITableView embedded in it.  I can adjust the height and width of the UITableView accordingly which provides me the UI layout that I am looking for.

I can customize the static cells in the UITableView but when I try to build I get the following error:

&gt;Illegal Configuration: Static table views are only valid when embedded in UITableViewController instances

My question is how are others getting around this?  Creating a tableview with static cells and laying them out visually is very nice but apparently that is not allowed for some reason that I cannot understand.  I can&#39;t switch to a UITableViewController because of my visual layout requirements.

Any assistance would be greatly appreciated.

How to visually create and use static cells in a UITableView embedded in a UIViewController

How do I test an update of my application, versus a clean install? I see that `adb install` has several flags, but I&#39;m not sure which one mimics reality.

I explicitly need to test app updating.



Testing an adb update, versus install?

<p>How do I test an update of my application, versus a clean install? I see that <code>adb install</code> has several flags, but I'm not sure which one mimics reality.</p>
<p>I explicitly need to test app updating.</p>


I&#39;ve just started diving into the Android world. I have a lot of experience programming apps in Python, so I&#39;ve searching for a good combination &quot;Android + Python&quot;, and I think I&#39;ve found it: [**Kivy**][1].

I need to make applications that are able to download and upload content from the internet, maybe some connection with the map component included in Android and more stuff to make a nice Android app.

But I really don&#39;t want to waste my time on something that maybe won&#39;t work. So, does anyone has some experience developing Android apps using **Kivy**? Is it really useful, simple, possible? Or is there a better option you have in mind?

  [1]: http://www.kivy.org

Kivy for Android apps

I have a `TextView` in my application. I want to align the text in it to the right. I tried adding:

    android:gravity=&quot;right&quot;

But this doesn&#39;t work for me.

What might I be doing wrong?

Right align text in android TextView

&gt; **Possible Duplicate:**  
&gt; [Difference between OnClick() event and OnClickListener?](https://stackoverflow.com/questions/7453299/difference-between-onclick-event-and-onclicklistener)  

&lt;!-- End of automatically inserted text --&gt;

I&#39;m semi-new to Android development and when I first started I tried to avoid using the xml layout by any means necessary so some of my earlier projects involve buttons that explicitly create an OnClickListener and implement it as an anonymous inner class. Such as -

    final Button button = new Button(this);
    button.setText(&quot;Click to change second line of text&quot;);

    OnClickListener buttonListener = new View.OnClickListener() {
        boolean clicked = false;
        int numClicks = 0;

        @Override
        public void onClick(View v) {
            if(numClicks &gt; 5) {
                button.setText(&quot;STOP IT&quot;);
			}
			numClicks++;
			if(clicked == false){
				clicked = true;
				tv2.setText(&quot;Text Changed on Button Click&quot;);	
			}
			else
			{
				clicked = false;
				tv2.setText(&quot;Click again&quot;);
			}		
		}
	};
	button.setOnClickListener(buttonListener);

But as I got more familiar with android, I began to understand the value of the xml layouts and implemented buttons like this

        &lt;Button
        android:id=&quot;@+id/button1&quot;
        android:layout_height = &quot;wrap_content&quot;
        android:layout_width =&quot;wrap_content&quot;
        android:text = &quot;lets do this&quot;
        android:onClick = &quot;DoIt&quot;
        /&gt;

In the layout xml, where DoIt was defined in the java.


My question is, are these 2 methods functionally the same thing? Is there an OnClickListener being defined by the compiler somewhere behind the scenes? Are there any features you trade off by using one way or the other?

How is using OnClickListener interface different via XML and Java code?

I&#39;m trying to build an Android project using the ndk, but I have run into some troubles.

Here&#39;s the Android.mk file that works:

    LOCAL_PATH:= $(call my-dir)
    
    include $(CLEAR_VARS)
    
    LOCAL_MODULE    := mylib
    LOCAL_CFLAGS    := -Werror
    LOCAL_SRC_FILES := main.cpp, Screen.cpp, ScreenManager.cpp  
    LOCAL_LDLIBS    := -llog
    
    include $(BUILD_SHARED_LIBRARY)

Is there a way that allows me to specify all the *.cpp files in the directory, without listing them manually under LOCAL_SRC_FILES?

So far I tried using LOCAL_SRC_FILES = $(wildcard *.cpp), but it did now work, it seems that no files get selected.



Android.mk, include all cpp files

I&#39;m using a `GridView` to display a bunch of views which are essentially `LinearLayouts`. I want the `LinearLayouts` to all be square, but I also want them to be dynamically sized--that is, there are two columns and I want the `LinearLayouts` to stretch depending on the size of the screen but remain square. Is there a way to do this through the `xml` layout or do I have to set the heights and widths programmatically?

Simple way to do dynamic but square layout

**As of 15/2/2012 I have yet to find a good explanation to nor a reason why this does not work. The closest to a solution is to use the traditional [Thread](https://stackoverflow.com/a/4085140/1107464/) approach, but then why include a class that does not (seem to) work in the Android SDK?**

Evenin&#39; SO!

I have an AsyncTask subclass:

    // ParseListener had a callback which was called when an item was parsed in a
    // RSS-xml, but as stated further down it is not used at all right now.
    private class xmlAsync extends AsyncTask&lt;String, RSSItem, Void&gt; implements ParseListener

That is executed like this:

    xmlAsync xmlThread = new xmlAsync();
			
    xmlThread.execute(&quot;http://www.nothing.com&quot;);

Now this subclass has run into a little error. Previously it did some xml-parsing, but when I noticed that it&#39;s **doInBackground()** wasn&#39;t called I stripped it down, line by line, finally ending up with just this:

    @Override
    protected Void doInBackground(String... params) 
    {
	    Log.v(TAG, &quot;doInBackground&quot;);
            return null;
    }

Which, for some reason, logged nothing. However, I added this:

    @Override
    protected void onPreExecute() 
    {
    		Log.v(TAG, &quot;onPreExecute&quot;);
    		super.onPreExecute();
    }

And that line is indeed logged when executing the thread. **_So somehow onPreExecute() is called but not doInBackground()_**. I have another AsyncTask running in the background at the same time which works just fine.

I&#39;m currently running the app on an emulator, SDK Version 15, Eclipse, Mac OS X 10.7.2, close to the North Pole.

**EDIT:**

    @Override
		protected void onProgressUpdate(RSSItem... values) {

			if(values[0] == null)
			{
                                // activity function which merely creates a dialog
				showInputError();
			}
			else
			{

				Log.v(TAG, &quot;adding &quot;+values[0].toString());
				_tableManager.addRSSItem(values[0]);
			}
			
			
			super.onProgressUpdate(values);
		}

_tableManager.addRSSItem() more or less adds a row to a SQLiteDatabase, initialized with the activity&#39;s context. publishProgress() is called by the Interface ParseListener&#39;s callback. However, since I don&#39;t even do anything except log.v in doInBackground() I first found this unnecessary to even bring up.

**EDIT 2:**

Alright, just to be perfectly clear, this is the other AsyncTask, executing in the same activity and working perfectly fine.

    private class dbAsync extends AsyncTask&lt;Void, RSSItem, Void&gt;
    {
    	Integer prevCount;
    	boolean run;
    	
    	@Override
    	protected void onPreExecute() {
    		run = true;
    		super.onPreExecute();
    	}
    	
    	@Override
    	protected Void doInBackground(Void... params) {
    		// TODO Auto-generated method stub
    		run = true;
    		prevCount = 0;
    		
    		while(run)
    		{
    			ArrayList&lt;RSSItem&gt; items = _tableManager.getAllItems();
    			
    			if(items != null)
    			{
    				if(items.size() &gt; prevCount)
        			{
        				Log.v(&quot;db Thread&quot;, &quot;Found new item(s)!&quot;);
        				prevCount = items.size();
        				
        				RSSItem[] itemsArray = new RSSItem[items.size()];
        				
        				publishProgress(items.toArray(itemsArray));
        			}
    			}    			
    			
    			SystemClock.sleep(5000);
    		}
    		
    		return null;
    	}
    	
    	@Override
    	protected void onProgressUpdate(RSSItem... values) {
    		
    		ArrayList&lt;RSSItem&gt; list = new ArrayList&lt;RSSItem&gt;();
    		
    		for(int i = 0; i &lt; values.length; i++)
    		{
    			list.add(i, values[i]);
    		}
    		
    		setItemsAndUpdateList(list);
    		
    		super.onProgressUpdate(values);
    	}
    	
    	@Override
    	protected void onCancelled() {
    		run = false;
    		
    		super.onCancelled();
    	}
    }

**EDIT 3:**

Sigh, sorry I&#39;m bad at asking questions. But here is the initialization of the Tasks.

    xmlAsync _xmlParseThread;
    dbAsync _dbLookup;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    
    _dbLookup = new dbAsync();
    _dbLookup.execute();
    
    _xmlParseThread = new xmlAsync();		
    _xmlParseThread.execute(&quot;http://www.nothing.com&quot;, null);
    }

Android SDK AsyncTask doInBackground not running (subclass)

I&#39;m trying to make an Android 4.0 emulator. I&#39;ve tried this process on a fairly fast computer in both Linux and Windows(Phenom II X6 w/ 8G of RAM) and every time I get &quot;unfortunately, launcher has stopped&quot; when I try to look at the menu of the launcher. 

![enter image description here][1]

I have tried having the RAM size all the way up to 1024M, but nothing seems to help it. Is this just a borked emulator or what? 


  [1]: http://i.stack.imgur.com/X3zkY.png

Android 4.0 emulator always has a crashing Launcher?

In my application I am uploading an image from gallery and I want to store this image in the SQLite database. How do I store a bitmap in the database? I am converting bitmap to a string and saving it in the database. While retrieving it from the database, I am not able to assign that string to ImageView since it is a string.


Imageupload12 .java:
```java
     public class Imageupload12 extends Activity {
      Button buttonLoadImage;
      ImageView targetImage;
      int i = 0;
      Database database = new Database(this);
      String i1;
      String img;
      @Override
      public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main5);
       buttonLoadImage = (Button) findViewById(R.id.loadimage);
       targetImage = (ImageView) findViewById(R.id.targetimage);
    
    
       Bundle b = getIntent().getExtras();
       if (b != null) {
        img = b.getString(&quot;image&quot;);
        targetImage2.setImageURI(&quot;image&quot;);
        //i am getting error as i cant assign string to imageview.
    
       }
    
       buttonLoadImage.setOnClickListener(new Button.OnClickListener() {
    
        public void onClick(View arg0) {
         // TODO Auto-generated method stub
         Intent intent = new Intent(Intent.ACTION_PICK,
          android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
         Log.i(&quot;photo&quot;, &quot;&quot; + intent);
         startActivityForResult(intent, i);
         i = i + 1;
        }
       });
    
      }
    
      @Override
      protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    
       // TODO Auto-generated method stub
       super.onActivityResult(requestCode, resultCode, data);
       switch (requestCode) {
    
        case 0:
         if (resultCode == RESULT_OK) {
          Uri targetUri = data.getData();
          //    	     textTargetUri.setText(targetUri.toString());
          Bitmap bitmap;
          try {
           bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(targetUri));
           targetImage.setImageBitmap(bitmap);
    
           i1 = bitmap.toString();
           Log.i(&quot;firstimage........&quot;, &quot;&quot; + i1);
           targetImage.setVisibility(0);
    
           SQLiteDatabase db = database.getWritableDatabase();
           db.execSQL(&quot;INSERT INTO UPLOAD VALUES(&#39;&quot; + i1 + &quot;&#39;);&quot;);
    
          } catch (FileNotFoundException e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
          }
         }
         break;
    
    
    
       }
    
      }
     }

```
Image.class:
```java
    public class Image extends Activity {
     Database database = new Database(this);
     static EfficientAdapter adapter, adapter1;
     static ListView lv1;
    
     static SQLiteDatabase db;
     static EfficientAdapter adp;
     static Cursor c1;
    
     static Vector &lt; String &gt; IMAGE = new Vector &lt; String &gt; ();
    
     @Override
     public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);
    
      db = database.getReadableDatabase();
      c1 = db.rawQuery(&quot;select * from UPLOAD;&quot;, null);
    
      if (c1.moveToFirst()) {
    
       do {
        IMAGE.add(c1.getString(0).toString());
    
       } while (c1.moveToNext());
    
       c1.close();
      }
    
      lv1 = (ListView) findViewById(R.id.List);
    
      adapter = new EfficientAdapter(this);
    
    
      lv1.setAdapter(adapter);
    
      ImageView add = (ImageView) findViewById(R.id.imv1a);
    
    
    
      add.setOnClickListener(new OnClickListener() {
    
       @Override
       public void onClick(View v) {
        // TODO Auto-generated method stub
        IMAGE.clear();
    
        Intent i = new Intent(Image.this, Imageupload12.class);
        startActivity(i);
    
    
       }
      });
    
    
     }
    
    
    
     private static class EfficientAdapter extends BaseAdapter {
    
    
      //		protected  final Context Context = null;
      protected LayoutInflater mLayoutInflater;
      AlertDialog.Builder aBuilder;
      public EfficientAdapter(Context context) {
       // TODO Auto-generated constructor stub
       mLayoutInflater = LayoutInflater.from(context);
      }
    
      @Override
      public int getCount() {
       // TODO Auto-generated method stub
    
       return IMAGE.size();
      }
    
      @Override
      public Object getItem(int position) {
       // TODO Auto-generated method stub
       return position;
      }
    
      @Override
      public long getItemId(int position) {
       // TODO Auto-generated method stub
       return position;
      }
    
      @Override
      public View getView(final int position, View convertView, ViewGroup parent) {
       // TODO Auto-generated method stub
    
       final ViewHolder mVHolder;
       if (convertView == null) {
        convertView = mLayoutInflater.inflate(R.layout.pjtlistdetails, parent, false);
    
        mVHolder = new ViewHolder();
    
        mVHolder.t1 = (TextView) convertView.findViewById(R.id.pjtdetails);
        mVHolder.time = (TextView) convertView.findViewById(R.id.name);
    
    
        mVHolder.imv = (ImageButton) convertView.findViewById(R.id.editic);
        mVHolder.imvd = (ImageView) convertView.findViewById(R.id.delete);
        mVHolder.imvf = (ImageView) convertView.findViewById(R.id.fwd);
    
    
    
    
    
        mVHolder.imv.setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View v) {
    
    
    
          String img = IMAGE.elementAt(position);
          Log.i(&quot;image...&quot;, &quot;&quot; + img);
    
          Context ctx = v.getContext();
          Intent myIntent = new Intent();
          ctx = v.getContext();
          myIntent.setClass(ctx, Imageupload12.class);
          myIntent.putExtra(&quot;image&quot;, img);
    
          ctx.startActivity(myIntent);
    
          IMAGE.clear();
    
         }
        });
        static class ViewHolder {
    
         ImageButton imv;
         ImageView imvd, imvf;
        }
       }
      }
     }
    }
```

How to store image in SQLite database

I made a simple `AlertDialog` in my **Activity**:

    View view = layoutInflater.inflate(R.layout.my_dialog, null);
    AlertDialog infoDialog = new AlertDialog.Builder(MyActivity.this)
    					.setView(view)	
    					.create();
    
    infoDialog.show();

With above code, the **dialog** shows at the (about) the center of the screen. 

I am wondering, how can I customize the dialog position to make it showing just under the top Action Bar ? (Is there anyway to change the gravity or something of the dialog?) and how to do it based on my code??

Changing position of the Dialog on screen android

I am developing my Android project, After I removed a unused library, I got the **error:**

    myproject/gen already exists but is not a source folder. Convert to a source folder or rename it

In my Activity code, all resources from `R.java` can not be resolved.


I tried, right click on my project =&gt; Java Build Path =&gt; under &quot;Source&quot; tab, I added gen/ as source. But it does not help with the problem...

Why, how to get rid of this problem?


----UPDATE----

I found that, the eclipse also complain that &quot;Project has no project.properties file! Edit the project properties to set one.&quot; , but I do have project.properties file under my project. Why it complains? I have cleaned the project and &quot;fix project properties&quot; but it does not help.

gen already exists but is not a source folder

I know that `adb install` will not replace an existing package if it&#39;s of a different build *type* (i.e. debug vs. release).

Eclipse also successfully replaces the debug apks whenever I run a debug session.

But when I attempt `adb install` for replacing an existing *release* apk with another release apk (same package name!), I get a failure message:

    adb install myapp-release.apk 
    	pkg: /data/local/tmp/myapp-release.apk
    Failure [INSTALL_FAILED_ALREADY_EXISTS]
    745 KB/s (34310 bytes in 0.044s)

Wasn&#39;t that supposed to work? What am I missing?

Why does adb install &lt;same-packagename-always-release&gt; fail?

I want to install an APK from PC to Android device. And because of user&#39;s Android and generally technical skills, I need to do it as automatically (silently) as possible. So how do I send an APK from PC to Android and start install there?

How to install APK from PC?

What is the equivalent of `apk` in `iOS`?

What is the equivalent of apk in iOS?

I&#39;ve decoded an APK with apktool (as the original source code was lost) so I could fix some issues with the layout xml files. I&#39;ve then rebuilt it back up with apktool and when I tried to install it on my device (using adb: adb install appname.apk) it gave me this error:

    [INSTALL_PARSE_FAILED_NO_CERTIFICATES]

the original apk however was signed by a keystore (on eclipse IDE), this one isn&#39;t, how can I sign it properly with it&#39;s original keystone file outside Eclipse!?

How to Sign an Already Compiled Apk

I&#39;m trying to extract the APK file of an installed Android app WITHOUT root permissions.

I thought that this was impossible, because all APK files for non-system-apps are located in /data/app, and accessing this folder requires root permission. Then I found that there are numerous apps in the Google Play store that seem to have access to the APK files even on non-rooted devices.

Can someone tell me how this is possible? Aren&#39;t there backup apps which backup the APK files without root?

How do I get the APK of an installed app without root access?

I am using a Samsung galaxy nexus phone (**Android 4.0** platform) .

I am developing Android app on Ubuntu linux OS. I would like to run my application directly on the Samsung handset device, so I performed the following setup steps:

1. in my project `AndroidManifest.xml` file, added `android:debuggable=&quot;true&quot;` to the `&lt;application&gt;` element

2. On the device, in the **Settings &gt; Security** enabled **Unknown sources**

3. On the device, in the **Settings &gt; Developer options** enabled **USB debugging**

4. On my computer, created the `/etc/udev/rules.d/51-android.rules` file with the following content:

        SUBSYSTEM==&quot;usb&quot;, ATTR{idVendor}==&quot;04E8&quot;, MODE=&quot;0666&quot;, GROUP=&quot;plugdev&quot; 

5. On my computer, run the `chmod a+r /etc/udev/rules.d/51-android.rules` command

Then, on my computer I opened a terminal and executed the `adb devices` command, I got:

    List of devices attached 
    ????????????	no permissions

Since I did not see my device but only `???????????? no permissions`, I then run the following commands:

     adb kill-server
     adb start-server
     adb devices

But I still got:

    List of devices attached 
    ????????????	no permissions

Why? What am I missing?



set up device for development (???????????? no permissions)

I need to install just ADB on customer&#180;s PC to connect to android phone and install apk there. And because of SDK size is it possible to do it without installing whole SDK?

Is there any way how to install just ADB without whole SDK?

I&#39;m basically trying to do this:
https://stackoverflow.com/questions/2417427/changing-the-android-emulator-locale-automatically

Everything works up until &#39;start&#39;.  the emulator starts to boot but keeps loading at the shimmering &#39;ANDROID&#39; screen forever.  I must be missing something...  How can I restart the emulator from ADB?  

Okay, I should be more specific.  

I am trying to do this from the command line using adb.  I can use adb to setprop and I can stop the emulator. When I try doing &#39;start&#39; in the adb shell, the emulator does begin to boot, but it never returns to the lock screen.  

How do I restart an android emulator?

Im automating a testing procedure for wifi calling and I was wondering is there a way to turn off/on wifi via adb?

I would either like to disable/enable wifi or kill wifi calling (com.movial.wificall) and restart it. 

Is it possible to do this all via adb and shell commands?   

so far I have found:

    android.net.wifi.WifiManager
    setWifiEnabled(true/false)

Im just not sure how to put it together






Content Type	Original Author	Original Content on Stackoverflow
Question	Stefan Kendall	View Question on Stackoverflow
Solution 1 - Android	HXCaine	View Answer on Stackoverflow

Testing an adb update, versus install?

Android Problem Overview

Android Solutions

Solution 1 - Android

How to visually create and use static cells in a UITableView embedded in a UIViewController

Would a Java HashSet<String>'s contains() method test equality of the strings or object identity?

Attributions