Getlaunchintentforpackage Is Null for Some Apps

getLaunchIntentForPackage is null for some apps

To create a home screen-style launcher, don't look for apps and then try to get launch Intents for each. Look for launchable activities, using queryIntentActivities() on PackageManager.

For example, this activity (from this sample project) implements a home screen-style launcher using this technique:

/***
  Copyright (c) 2008-2012 CommonsWare, LLC
  Licensed under the Apache License, Version 2.0 (the "License"); you may not
  use this file except in compliance with the License. You may obtain a copy
  of the License at http://www.apache.org/licenses/LICENSE-2.0. Unless required
  by applicable law or agreed to in writing, software distributed under the
  License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
  OF ANY KIND, either express or implied. See the License for the specific
  language governing permissions and limitations under the License.

  From _The Busy Coder's Guide to Android Development_
    http://commonsware.com/Android
*/

package com.commonsware.android.launchalot;

import android.app.ListActivity;
import android.content.ComponentName;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import java.util.Collections;
import java.util.List;

public class Launchalot extends ListActivity {
  AppAdapter adapter=null;

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    PackageManager pm=getPackageManager();
    Intent main=new Intent(Intent.ACTION_MAIN, null);

    main.addCategory(Intent.CATEGORY_LAUNCHER);

    List<ResolveInfo> launchables=pm.queryIntentActivities(main, 0);

    Collections.sort(launchables,
                     new ResolveInfo.DisplayNameComparator(pm)); 

    adapter=new AppAdapter(pm, launchables);
    setListAdapter(adapter);
  }

  @Override
  protected void onListItemClick(ListView l, View v,
                                 int position, long id) {
    ResolveInfo launchable=adapter.getItem(position);
    ActivityInfo activity=launchable.activityInfo;
    ComponentName name=new ComponentName(activity.applicationInfo.packageName,
                                         activity.name);
    Intent i=new Intent(Intent.ACTION_MAIN);

    i.addCategory(Intent.CATEGORY_LAUNCHER);
    i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK |
                Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);
    i.setComponent(name);

    startActivity(i);    
  }

  class AppAdapter extends ArrayAdapter<ResolveInfo> {
    private PackageManager pm=null;

    AppAdapter(PackageManager pm, List<ResolveInfo> apps) {
      super(Launchalot.this, R.layout.row, apps);
      this.pm=pm;
    }

    @Override
    public View getView(int position, View convertView,
                          ViewGroup parent) {
      if (convertView==null) {
        convertView=newView(parent);
      }

      bindView(position, convertView);

      return(convertView);
    }

    private View newView(ViewGroup parent) {
      return(getLayoutInflater().inflate(R.layout.row, parent, false));
    }

    private void bindView(int position, View row) {
      TextView label=(TextView)row.findViewById(R.id.label);

      label.setText(getItem(position).loadLabel(pm));

      ImageView icon=(ImageView)row.findViewById(R.id.icon);

      icon.setImageDrawable(getItem(position).loadIcon(pm));
    }
  }
}

On an Android TV device, you should also search for LEANBACK_LAUNCHER activities, as that's what Android TV uses, and TV-specific APKs might not have a regular LAUNCHER activity, or at best have one that is not necessarily ideal for use on a TV.

getLaunchIntentForPackage is null for apps

I have solved the problem:

String s = mArrayProducts.get(position).getPackageName();
Intent PackageManagerIntent = getPackageManager().getLaunchIntentForPackage(s); NULL
startActivity(PackageManagerIntent);

Android Intent To Open Application Not Working

As you can read here, getLaunchIntentForPackage (String packageName)

Return a "good" intent to launch a front-door activity in a package [...]

The current implementation will look first
for a main activity in the category CATEGORY_INFO, next for a main
activity in the category CATEGORY_LAUNCHER, or return null if neither
are found.

so, in the intent, the category will already be set. If you manually change it, probably you are breaking the intent, since the category could not be the correct one that the manager found.

so, just remove the line

i.addCategory(Intent.CATEGORY_LAUNCHER);

Starting ANY of the installed apps

How can i get the launchIntent for dialer and contacts?

Those are not apps. Those are other launchable activities of another app.

Hence, you need to decide what it is that you are writing.

You said that you have "a list of all installed apps and he can pick any app and starts it". In that case, you specifically do not want "dialer and contacts", as those are not apps.

If, instead, you want to show a list of all launchable activities, from which the user can pick, you would not be using getLaunchIntentForPackage(). Instead, you would use queryIntentActivities() to find those launchable activities. I have a sample app that demonstrates this, in the form of a launcher.

String mismatch error regarding packageManager and getLaunchIntentForPackage in Kotlin

The error you are receiving is because when you access app.appPackageName there is a chance that the application's package name may be null. This is because this method is originally written in Java and Kotlin protects itself in case of the value null. That is why it's type is String?.

To overcome this issue, you need to add a nullability check before accessing this value. That way, Kotlin will interpret it's type as String.

override fun getView(position:Int, convertView:View, parent:ViewGroup):View 
{
    val v:View
    if (convertView == null)
    {
        v = inflater.inflate(R.layout.item_app, parent, false)
    }
    else
    {
        v = convertView
    }

    val myLayoutView = v.findViewById(R.id.layout) as LinearLayout
    val myImageView = v.findViewById(R.id.image) as ImageView
    val myLabelView =v.findViewById(R.id.label) as TextView

    val app = getItem(position) as AppObject
    myLabelView.text = app.appName
    myImageView.setImageDrawable(app.appImage)

    myLayoutView.setOnClickListener(object: View.OnClickListener 
    {
        override fun onClick(v:View)
        {
            val applicationPackageName : String? = app.appPackageName
            if (applicationPackageName != null) {

                  val launchAppIntent = context.packageManager.getLaunchIntentForPackage(applicationPackageName)
                  if (launchAppIntent != null)
                  {
                    context.startActivity(launchAppIntent)
                  }
                }
           } else {
             //YOUR LOGIC
           }
    })
    return v
}

getPackageManager() always return null

the Toast shows Error (my else condition),meaning getPackageManager() returns null

No. You would be getting a NullPointerException in that case. In your case, getLaunchIntentForPackage() is returning null.

That, plus your other symptoms, suggests that you do not have an application whose applicationId is com.b_app installed on this device.

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