How to call Android calculator from another app for all phones

How to call Android calculator from another app for all phones

LOAD all apps to Array

    // Declare universal if you want Access any where from scope


ArrayList<HashMap<String,Object>> items;
    PackageManager pm ;    
List<PackageInfo> packs;

    // initialise From Oncreate if you want
    items =new  ArrayList<HashMap<String,Object>>(); 
    pm = getPackageManager();
    packs = pm.getInstalledPackages(0);  
        for (PackageInfo pi : packs)
 {
            HashMap<String, Object> map = new HashMap<String, Object>();
            map.put("appName", pi.applicationInfo.loadLabel(pm));
            map.put("packageName", pi.packageName);
            items.add(map); 
 }

THIS IS TRICK PART We are Traversing through all Apps to get App Named or Matches “Calculator”

public void opencalculator(){
  int d=0;
  if(items.size()>=1){
  int j=0;
 for(j=0;j<items.size();j++){
 String AppName = (String) items.get(j).get("appName");
// Log.w("Name",""+AppName);
    if(AppName.matches("Calculator"))
                     {
                            d=j;
                            break;
                     }
                    }
                    String packageName = (String) items.get(d).get("packageName");

                    Intent i = pm.getLaunchIntentForPackage(packageName);
                    if (i != null){
                        Toast.makeText(getContext(),"STARTING",Toast.LENGTH_SHORT).show();

                        startActivity(i);}
                    else {
                        Toast.makeText(getContext(),"SORRY I CANT OPEN CALCULATOR :(",Toast.LENGTH_SHORT).show();

                    }
                }


                else{
                    Toast.makeText(getContext(),"SORRY I CANT START CALCULATOR :(",Toast.LENGTH_SHORT).show();


                }
}

CALL OPENCALCULATOR

opencalculator();

Also, you can make a public method to call the calculator in your app like this.

public void openMyCalculator(Context context){

    // Declare universal if you want Access any where from scope

    ArrayList<HashMap<String,Object>> items;
    PackageManager pm ;
    List<PackageInfo> packs;

    // initialise From Oncreate if you want
    items =new  ArrayList<HashMap<String,Object>>();
    pm = context.getPackageManager();
    packs = pm.getInstalledPackages(0);
    for (PackageInfo pi : packs)
    {
        HashMap<String, Object> map = new HashMap<String, Object>();
        map.put("appName", pi.applicationInfo.loadLabel(pm));
        map.put("packageName", pi.packageName);
        items.add(map);
    }

    int d=0;
    if(items.size()>=1){
        int j=0;
        for(j=0;j<items.size();j++){
            String AppName = (String) items.get(j).get("appName");
            // Log.w("Name",""+AppName);
            if(AppName.matches("Calculator"))
            {
                d=j;
                break;
            }
        }
        String packageName = (String) items.get(d).get("packageName");

        Intent i = pm.getLaunchIntentForPackage(packageName);
        if (i != null){
            Toast.makeText(context,"STARTING",Toast.LENGTH_SHORT).show();

            context.startActivity(i);}
        else {
            Toast.makeText(context,"SORRY I CANT OPEN CALCULATOR :(",Toast.LENGTH_SHORT).show();

        }
    }


    else{
        Toast.makeText(context,"SORRY I CANT START CALCULATOR :(",Toast.LENGTH_SHORT).show();


    }
}

Now call the calculator method using

openMyCalculator(MainActivity.this);

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