Develop Reference

Two launcher activities creating two APKs

I recently added a splash-screen to my app and made it as launcher activity to display it when the app started, the manifest looks like,
<activity android:name=".LaucherActivity" android:theme="#style/SplashTheme">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
And I have the MainActivity which is already a launcher activity in the manifest shown below,
<activity
android:name=".MainActivity"
android:screenOrientation="portrait"
android:theme="#style/AppTheme.TransparentTheme">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" /> s
</intent-filter>
</activity>
So, this is actually creating two APKs, one for the splash and the other main activity. But I wanted the SplashActivity and MainActivity in the same APK running one after the other. How can I achieve that? I found many related questions but none of them are working for me.

Use <intent-filter> only once in manifest. like this
<activity android:name=".LaucherActivity" android:theme="#style/SplashTheme">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".MainActivity"
android:screenOrientation="portrait"
android:theme="#style/AppTheme.TransparentTheme">
</activity>

public class LaucherActivity extends Activity {
private static int SPLASH_TIME_OUT = 3000;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_splash);
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
Intent i = new Intent(LaucherActivity.this, MainActivity.class);
startActivity(i);
finish();
}
}, SPLASH_TIME_OUT);
}
}

Remove this from you MainActivity.
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
Now call your MainActivity from your Splash Activity

How to make activity launcher for different api version?

I'm building an kiosk App for two different versions: Android 6 and before.
When app started I have StartActivity and 2 Activities for different APK lvl, start this:
public class StartActivity extends AppCompatActivity {
#Override
protected void onCreate(#Nullable final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
startActivity(new Intent(this, MainActivityNew.class).addFlags(Intent.FLAG_ACTIVITY_NEW_TASK));
} else {
startActivity(new Intent(this, MainActivityOld.class).addFlags(Intent.FLAG_ACTIVITY_NEW_TASK));
}
finish();
}
}
MainActivityNew and MainActivityOld must be launchers (when button home is pressed he must call)
In Manifest file i write:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.ng.lockergks">
<application
android:name="com.gks.locker.App"
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/Theme.AppCompat.Light.NoActionBar.FullScreen">
<activity android:name="ru.gks.locker.ui.activity.StartActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
<activity
android:name=".MainActivityOld"
android:launchMode="singleInstance"
android:screenOrientation="portrait"
android:stateNotNeeded="true">
<intent-filter>
<category android:name="android.intent.category.HOME"/>
<category android:name="android.intent.category.DEFAULT"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
<activity
android:name=".MainActivityNew"
android:launchMode="singleInstance"
android:screenOrientation="portrait"
android:stateNotNeeded="true">
<intent-filter>
<category android:name="android.intent.category.HOME"/>
<category android:name="android.intent.category.DEFAULT"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
<activity android:name=".AppListActivity"/>
</application>
</manifest>
That is, when the application starts, check the version of the API, and depending on it, runs one way or the other activity which should be a launcher. On both versions it does not work. How to define such behavior?

How to force the App to react to a registered Action

I have two Apps ImplicitIntent_00 and ImplicitIntent_01. in ImplicitIntent_00, in the manifest file, I registered for the action "android.intent.action.VIEW" as shown below in the manifest file.
While, in implicitintent_01, it has the following code:
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
String url = "http://www.vogella.com";
Intent i = new Intent(Intent.ACTION_VIEW);
i.setData(Uri.parse(url));
i.putExtra("extra", "value");
startActivity(i);
}
}
what I want to do is, when I run implicitintent_01, i want implicitintent_00 App to show up in the selection menu as an App that can perform the "android.intent.action.VIEW" action.
But currently when I run the implicitintent_01 App, the implicitintent_00 never show up among the Apps in the selection menu
how to do that correctly.
Manifest of implicitIntent_00:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.com.implicitintent_00" >
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/AppTheme" >
<activity android:name=".MainActivity"
android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.DEFAULT" />
<data android:scheme="http"/>
</intent-filter>
</activity>
</application>

try using this in your implicitintent_00 manifest activity tag
<intent-filter>
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.DEFAULT" />
<category android:name="android.intent.category.BROWSABLE" />
</intent-filter>

No activity found to handle Intent/no launcher activity found manifest file issue

Here's the problem guys, first i tried to run my application with Launch default activity as launch action (Run Configurations --> Android --> Launch action), the logcat kept telling me that it can't find the launcher activity and the application wouldn't even start, problem is i defined my launcher activity in the manifest file, but it's like it's not reading it at all.
So i tried to launch the splash activity by specifically telling it to run it through run configurations, it did launch but during the transition to the next activity it crashed again, the logcat says no activity found to handle intent, which again, I defined the way I did in other applications and worked alright there. Plase help it's a nightmare.
Here's the code for the MainActivity:
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Thread timer = new Thread()
{
public void run(){
try{
sleep(6000);
} catch (InterruptedException e){
e.printStackTrace();
} finally {
Intent openStarting = new Intent("totaltrainer.com.WorkoutPlace");
startActivity(openStarting);
}
}
};
timer.start();
}
#Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
finish();
}
}
And Manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="totaltrainer.com"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="15" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="totaltrainer.com.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".WorkoutPlace"
android:label="#string/app_name" >
<intent-filter>
<action android:name="totaltrainer.com.WorkoutPlace" />
</intent-filter>
</activity>
<activity
android:name=".WorkoutHome"
android:label="#string/app_name" >
<intent-filter>
<action android:name="totaltrainer.com.WorkoutHome" />
</intent-filter>
</activity>
<activity
android:name=".WorkoutGym"
android:label="#string/app_name" >
<intent-filter>
<action android:name="totaltrainer.com.WorkoutGym" />
</intent-filter>
</activity>
</application>
</manifest>

use "totaltrainer.com.WORKOUTGYM" and so on
and below use this
<category android:name="android.intent.category.DEFAULT" />

Problem 1
logcat kept telling me that it can't find the launcher activity and
the application wouldn't even start
In your Manifest file, change below
<activity
android:name=".MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="totaltrainer.com.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
as
<activity android:name="MainActivity">
<!-- This activity is the main entry, should appear in app launcher -->
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
What happens when you define this Action and Category ?
The ACTION_MAIN action indicates this is the main entry point and does not expect any intent data.
The CATEGORY_LAUNCHER category indicates that this activity's icon should be placed in the system's app launcher. If the element does not specify an icon with icon, then the system uses the icon from the element.
These two must be paired together in order for the activity to appear in the app launcher.
Problem 2
the logcat says no activity found to handle intent
Your Manifest declaration seems fine.
In your activity class, change
Intent openStarting = new Intent("totaltrainer.com.WorkoutPlace");
startActivity(openStarting);
as
Intent openStarting = new Intent();
openStarting.setAction("totaltrainer.com.WorkoutPlace");
startActivity(openStarting);

How to start a new application on Android

How can I start a new application on Android? I have done a new applications NewHomeScreen and Hello and on NewHomeScreen I wrote this code.
#Override public void onCreate(Bundle state) {
super.onCreate(state);
setContentView(R.layout.main);
Intent mainIntent = new Intent(this,Hello.class);
startActivity(mainIntent);
}
However, it does not start Hello application. Debugger says that state has value null but what should it be? I also wrote this to Manifest:
<activity android:name="Hello">
<intent-filter>
<action android:name="android.intent.action.HELLO" />
<category android:name="android.intent.category.HELLO"/>
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>

Try getting rid of the intent-filter in your Home activity. You don't need it anyway, if it's not your main screen.

I think you forgot to specify the main Activity in your AndroidManifest.xml file:
<application android:icon="#drawable/icon">
<activity android:name="NewHomeScreen" android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.HELLO" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>