Develop Reference

it says apk installed but no apk

I made my schedule. I'm installing but the apk is not there. everything is clear in the picture
I made changes to the manifest, is it something related to it?
Manifest
<activity
android:name=".MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<activity
android:name=".MainActivity"
android:label="#string/app_name" >
<category android:name="android.intent.category.LAUNCHER" />
</activity></intent-filter>
</activity>
<activity
android:name=".guzelsozleractivity"
android:label="#string/app_name" />
</application>

You are declaring MainActivity twice.
Declare it like this:
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

Your manifest was wrongly entered, update the Manifest.xml to the code given below it will work. Please like and accept the answer if it worked.
Happy coding.
<activity
android:name=".MainActivity"
android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

How to run last viewed activity after resume?

I've got an android application. If I go through activities(for example MainTabActivity->SearchMapActivity->ListBranchesActivity) and then hide(not close) my application, android will run the main (MainTabActivity) activity after reopen. If I press "back" button, android will show me the last activity (ListBranchesActivity). How can I make my app show the last activity after resuming? I really have no idea how to achieve that. Somebody says to add singleTask statement to manifest.
My manifest:
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#android:style/Theme.Holo"
android:largeHeap="true" >
<activity
android:name=".SearchMapActivity"
android:label="#string/app_name"
android:screenOrientation="portrait"
android:configChanges="keyboardHidden|orientation|screenSize">
<intent-filter>
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.BROWSABLE"/>
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".UpdateActivity"
android:label="#string/app_name"
android:screenOrientation="portrait"
android:configChanges="keyboardHidden|orientation|screenSize">
<intent-filter>
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.BROWSABLE"/>
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".CompanyInfoActivity"
android:label="#string/app_name"
android:screenOrientation="portrait"
android:configChanges="keyboardHidden|orientation|screenSize">
<intent-filter>
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.BROWSABLE"/>
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".FullMapActivity"
android:label="#string/app_name"
android:screenOrientation="portrait"
android:configChanges="keyboardHidden|orientation|screenSize">
<intent-filter>
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.BROWSABLE"/>
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".ListBranchesActivity"
android:label="#string/app_name"
android:screenOrientation="portrait"
android:configChanges="keyboardHidden|orientation|screenSize">
<intent-filter>
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.BROWSABLE"/>
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".ListCompaniesByBranchActivity"
android:label="#string/app_name"
android:screenOrientation="portrait"
android:configChanges="keyboardHidden|orientation|screenSize">
<intent-filter>
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.BROWSABLE"/>
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".SearchResultActivity"
android:label="#string/app_name"
android:screenOrientation="portrait"
android:configChanges="keyboardHidden|orientation|screenSize">
<intent-filter>
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.BROWSABLE"/>
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".MainTabActivity"
android:label="#string/app_name"
android:screenOrientation="portrait"
android:configChanges="keyboardHidden|orientation|screenSize">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
Also that thing doesn't happen everytime. Sometimes it shows last activity, sometimes - main activity.

> Also that thing doesn't happen everytime. Sometimes
> it shows last activity, sometimes - main activity.
Sometime android closes your app if it needs memory. So even if you hide(not close) ...[the] application, it might have been closed anyway

Change default launcher on button click ANDROID

I have this code in my manifest which allows me to set different activities in my application as the launcher. Is there a way that I can implement a button so that on button click it allows me to change the default launcher? For example, when I set the default launcher as settings activity, home activity can't be set as the default. I want the option to change it.
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name=".SettingsActivity"
android:label="#string/title_activity_settings" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.HOME" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".HomeActivity"
android:label="#string/app_name"
android:launchMode="singleTask"
android:stateNotNeeded="true" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<action android:name="android.intent.action.SEARCH" />
<category android:name="android.intent.category.LAUNCHER" />
<category android:name="android.intent.category.HOME" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>

You can use PackageManager to disable/enable each of your app components but perhaps it would be simpler to stick to one entry point in your app (like StartActivity with no UI (i.e. themed Theme.NoDisplay) which would then call startActivity() on the right one depending on user config.

No Launcher activity found

I can't find any problem but it keep giving me the error "No Launcher activity found!" and "The launch will only sync the application package on the device!"
can anyone solve this problem???
This is my Maniest
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.saikoro.MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name="com.example.saikoro.StartUp"
android:label="#string/app_name" >
<intent-filter>
<action android:name="com.example.saikoro.StartUp" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>

The <activity> element of the activity you want to launch through the icon on the app list must contain both of the following parts of the intent-filter:
<intent-filter>
<category android:name="android.intent.category.LAUNCHER" />
<action android:name="android.intent.action.MAIN" />
</intent-filter>
Your current manifest has an activity with category LAUNCHER and action MAIN, but in different activities. The one with the icon in the app list must have them both.

Change
<action android:name="com.example.saikoro.StartUp" />
with
<action android:name="android.intent.action.MAIN" />

Android: DEFAULT activity showing up instead of LAUNCHER

I am making a simple Android Application, which consists of only two activities, .Password and .Adder
<activity
android:name=".Adder"
android:label="#string/title_activity_adder" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".Password"
android:label="#string/title_activity_adder" >
<intent-filter>
<action android:name="android.intent.action.PASSWORD" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
The .Password activity is set as the LAUNCHER but when I run it, the .Adder Activity shows us instead.
I have the .xml and .java file for both the activity properly connected by setContentView() and Eclipse is not reporting any kind of error in any file at all.
The Password Activity checks for the correct password and switches control to the Adder Activity:
Intent openStartingPoint = new Intent("com.example.pointsadder.MAIN");
startActivity(openStartingPoint);

You don t have to write intent filter to each activity. Correct xml:
<activity
android:name=".Adder"
android:label="#string/title_activity_adder" >
</activity>
<activity
android:name=".Password"
android:label="#string/title_activity_adder" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

Change this:
<activity
android:name=".Password"
android:label="#string/title_activity_adder" >
<intent-filter>
<action android:name="android.intent.action.PASSWORD" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
to this:
<activity
android:name=".Password"
android:label="#string/title_activity_adder" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
And modify this as shown:
<activity
android:name=".Adder"
android:label="#string/title_activity_adder" >
</activity>
Refer to this link: http://developer.android.com/guide/topics/manifest/manifest-intro.html#iconlabel for more details.