How to call a native application?

In this post link I found the following code:

You will have to use Intent , add these variables to your class MyActivity :

private static final String CALCULATOR_PACKAGE_NAME = "com.android.calculator2";
private static final String CALCULATOR_CLASS_NAME   = "com.android.calculator2.Calculator";

Add this method to other methods:

public void launchCalculator()
{
    Intent intent = new Intent();
    intent.setAction(Intent.ACTION_MAIN);
    intent.addCategory(Intent.CATEGORY_LAUNCHER);
    intent.setComponent(new Component Name(CALCULATOR_PACKAGE_NAME,
                                            CALCULATOR_CLASS_NAME));

    try {
        this.start Activity(intent);
    } catch (ActivityNotFoundException noSuchActivity) {
        // handle exception where calculator intent filter is not registered
    }
}

You can use launchCalculator in the click event of your button, for example:

     final Button button = (Button) findViewById(R.id.ID_DO_SEU_BOTAO);
     button.setOnClickListener(new View.OnClickListener() {
         public void onClick(View v) {
             launchCalculator(); //Chama o Intent
         }
     });

  

It's been a while since I've been working with Java and Android, I may have missed something in the code, let me know if it fails.

• Read about Intent : link
• Read about Java: link
• Examples android: link

The difficulty is that some manufacturers replace the pure Android standard calculator (package com.android.calculator2 ) with their own applications, which are in a different package, so it is difficult to guess which package the calculator is.

But you can try to find the default calculator like this:

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 then you can call the application by doing:

if(items.size()>=1){
    String packageName = (String) items.get(0).get("packageName");
    Intent i = pm.getLaunchIntentForPackage(packageName);
    if (i != null) {
        startActivity(i);
    } else{
        // Aplicativo não encontrado
    }
}

Source: SOen