Android Question find and start the default launcher

[peacemaker]

HI, All

If we have our app as the default launcher, but we need to make some setup or another apps - is it possible to find the system device's launcher package, and then start its activity ?

 

[Erel]

Yes, with PackageManager.QueryIntentActivities

 

[User242424]

If we have our app as the default launcher, but we need to make some setup or another apps - is it possible to find the default launcher package, and then start its activity ?

Hey,
you don't need to find the launcher activity. you can start the app by this code [haven't test it before] :

Dim Jo As JavaObject
Jo.InitializeContext
Jo = Jo.RunMethod("getPackageManager",Null)
Jo = Jo.RunMethod("getLaunchIntentForPackage",Array("APPLICATION_PACKAGENAME"))
Try
Jo = Jo.RunMethod("makeRestartActivityTask",Null)
Catch 'Ignore
End Try
StartActivity(Jo)

 

[peacemaker]

Thanks, but how to initially find the system device's launcher package ?

 

[Erel]

I think that I misunderstood the question. What exactly are you trying to do?

 

[User242424]

Thanks, but how to initially find the system device's launcher package ?

Try this

Dim Jo As JavaObject
Jo.InitializeContext
Jo = Jo.RunMethod("getPackageManager",Null)
Dim intent As Intent
intent.Initialize("android.intent.action.MAIN","")
intent.AddCategory("android.intent.category.HOME")
Jo = Jo.RunMethod("resolveActivity",Array(intent,0x00010000))
Jo = Jo.GetFieldJO("activityInfo")
Log(Jo.GetField("packageName"))

 

[peacemaker]

Try this

Yes, thanks, works, but:
1) if to start in debug mode - result is just "android".
2) if to start in release mode - result is correct launcher package "com.google.android.apps.nexuslauncher" (on Emulator) or "com.android.launcher3" on a real device, but ... it cannot be started.
The intent is not initialized

    Dim pm As PackageManager
    In = pm.GetApplicationIntent(package)

((RuntimeException) java.lang.RuntimeException: Object should first be initialized (Intent).)

Maybe it's some global limit.

 

[User242424]

but ... it cannot be started.

The code will give you the device default launcher packagename!
What are you tryin to start?

 

[peacemaker]

What are you tryin to start?

Trying to start second launcher.
1) Initially get the system default launcher package name and save it.
2) Then set my app as the default launcher.
3) And start first system's launcher from my app.

 

[User242424]

2) Then set my app as the default launcher.

I believe that You can not set ur app as the default launcher programmatically.
User should set ur app as the default one.
The only thing that you can do, you can open settings for launcher.

 

[peacemaker]

The only thing that you can do, you can open settings for launcher.

Sure, it's done, manual control. But how to be if some setup is needed, or other apps ?
Yes, i have made the menu to start SYSTEM_SETTINGS

    Dim in As Intent
    in.Initialize("android.settings.HOME_SETTINGS", "")    'in.Initialize("android.settings.SETTINGS", "")
    StartActivity(in)

but ... maybe more universal way just to start default launcher from my launcher ?

 

[User242424]

Based on https://stackoverflow.com/a/41311319

This should work

Sub SetDefaultLauncherNow
    Dim Jo As JavaObject
    Jo.InitializeContext
    Jo.RunMethod("SetDefaultLauncherNow",Null)
End Sub

#if java
import java.util.List;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.ComponentName;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.net.Uri;
import android.os.Build.VERSION;
import android.text.SpannableString;
import android.text.style.TtsSpan.TextBuilder;


   enum HomeState {
        GEL_IS_DEFAULT, OTHER_LAUNCHER_IS_DEFAULT, NO_DEFAULT
    }
    
    public void SetDefaultLauncherNow(){
    new SetDefaultLauncher(this).launchHomeOrClearDefaultsDialog();
    }

public class SetDefaultLauncher {

    public static final String LAUNCHER_CLASS = "com.android.launcher.launcher3.Launcher";
    public static final String LAUNCHER_PACKAGE = "com.android.launcher";
    
    private static final String change_default_home_dialog_body = "Change default home luncher";
    private static final String change_default_home_dialog_body_settings = "Change default home luncher settings";
    private static final String change_default_home_dialog_body_settings_tts = "Change default home luncher settings tts";
    
    Activity activity;
    public SetDefaultLauncher(Activity activity){
        this.activity=activity;
    }

    public boolean launchHomeOrClearDefaultsDialog() {
        Intent intent = new Intent("android.intent.action.MAIN");
        intent.addCategory("android.intent.category.HOME");
        ResolveInfo resolveActivity = activity.getPackageManager().resolveActivity(
                intent, 0);
        HomeState homeState = (LAUNCHER_PACKAGE
                .equals(resolveActivity.activityInfo.applicationInfo.packageName) && LAUNCHER_CLASS
                .equals(resolveActivity.activityInfo.name)) ? HomeState.GEL_IS_DEFAULT
                : (resolveActivity == null
                        || resolveActivity.activityInfo == null || !inResolveInfoList(
                        resolveActivity, activity.getPackageManager()
                                .queryIntentActivities(intent, 0))) ? HomeState.NO_DEFAULT
                        : HomeState.OTHER_LAUNCHER_IS_DEFAULT;
        switch (homeState) {
        case GEL_IS_DEFAULT:
        case NO_DEFAULT:
            intent = new Intent("android.intent.action.MAIN");
            intent.addCategory("android.intent.category.HOME");
            intent.setFlags(268435456);
            activity.startActivity(intent);
            return true;
        default:
            showClearDefaultsDialog(resolveActivity);
            return false;
        }
    }
    @SuppressLint("NewApi") private void showClearDefaultsDialog(ResolveInfo resolveInfo) {
        CharSequence string;
        final Intent intent;
        CharSequence loadLabel = resolveInfo.loadLabel(activity.getPackageManager());
        if (VERSION.SDK_INT < 21
                || activity.getPackageManager().resolveActivity(
                        new Intent("android.settings.HOME_SETTINGS"), 0) == null) {
      
            intent = new Intent(
                    "android.settings.APPLICATION_DETAILS_SETTINGS",
                    Uri.fromParts("package",
                            resolveInfo.activityInfo.packageName, null));
        } else {
            intent = new Intent("android.settings.HOME_SETTINGS");
          
        }


        
                                try {
                                    intent.setFlags(276856832);
                                    activity.startActivity(intent);
                                } catch (Exception e) {
                                    setDefLauncher(activity);
                                }
                          
    }

    private boolean inResolveInfoList(ResolveInfo resolveInfo,
            List<ResolveInfo> list) {
        for (ResolveInfo resolveInfo2 : list) {
            if (resolveInfo2.activityInfo.name
                    .equals(resolveInfo.activityInfo.name)
                    && resolveInfo2.activityInfo.packageName
                            .equals(resolveInfo.activityInfo.packageName)) {
                return true;
            }
        }
        return false;
    }

    private void setDefLauncher(Context c) {
        PackageManager p = c.getPackageManager();
        ComponentName cN = new ComponentName(c, this.activity.getClass());
        p.setComponentEnabledSetting(cN,
                PackageManager.COMPONENT_ENABLED_STATE_ENABLED,
                PackageManager.DONT_KILL_APP);

        Intent selector = new Intent(Intent.ACTION_MAIN);
        selector.addCategory(Intent.CATEGORY_HOME);
        c.startActivity(selector);
        p.setComponentEnabledSetting(cN,
                PackageManager.COMPONENT_ENABLED_STATE_DISABLED,
                PackageManager.DONT_KILL_APP);
    }
}
#End If

 

[peacemaker]

This should work

No idea why this is, question was about starting the launcher itself. But thanks anyway for try.
So, starting another launcher from my default launcher is not possible, let's finish on this.