How to call android calculator on my app for all phones

Question

  public static final String CALCULATOR_PACKAGE =\"com.android.calculator2\";
  public static final String CALCULATOR_CLASS =\"com.android.calculator2.Calculator\";
         


        

Answer 1

You'll have to check if the default calculator package name(com.android.calculator2) is available with this:

try{
     ApplicationInfo info = getPackageManager()
                             .getApplicationInfo("com.android.calculator2", 0 );

    } catch( PackageManager.NameNotFoundException e ){
     //application doesn't exist
}

Samsung uses a lot of apps preinstalled with TouchWiz which aren't available in stock Android. Therefore if you get an Exception in the above you can check if Samsung's calculator is available. Btw I think com.android.calculator2 is not HTC specific.

Answer 2

Well this is a Modified Answer of @ρяσѕρєя K becouse it works fine in samsung mobiles and only packages have "calc" but not all mobiles like HTC AND LENOVO ETC

And for Api >= 15 ,You can use BUT !!!

    Intent intent = new Intent();
    intent.setAction(Intent.ACTION_MAIN);
    intent.addCategory(Intent.CATEGORY_APP_CALCULATOR);
    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    startActivity(intent);

THIS MAY CAN CAUSE ERROR LIKE THIS

android.content.ActivityNotFoundException: No Activity found to handle Intent { act=android.intent.action.MAIN cat=[android.intent.category.APP_CALCULATOR] flg=0x10000000 }

SO LETS TAKE A LOOK AT THIS

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();

Answer 3

you can try as to Default calculator on all android devices:

ArrayList<HashMap<String,Object>> items =new ArrayList<HashMap<String,Object>>();

final PackageManager pm = getPackageManager();
List<PackageInfo> packs = pm.getInstalledPackages(0);  
for (PackageInfo pi : packs) {
if( pi.packageName.toString().toLowerCase().contains("calcul")){
    HashMap<String, Object> map = new HashMap<String, Object>();
    map.put("appName", pi.applicationInfo.loadLabel(pm));
    map.put("packageName", pi.packageName);
    items.add(map);
 }
}

and now you can launch calculator application as:

if(items.size()>=1){
String packageName = (String) items.get(0).get("packageName");
Intent i = pm.getLaunchIntentForPackage(packageName);
if (i != null)
  startActivity(i);
} 
else{
      // Application not found
   }

And for Api >= 15 ,You can use

Intent intent = new Intent();
intent.setAction(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_APP_CALCULATOR);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);

Answer 4

Intent i = new Intent();
i.setAction(Intent.ACTION_MAIN);
i.addCategory(Intent.CATEGORY_APP_CALCULATOR);
startActivity(i);