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Is there any way to create a basic method, that enables me to create an intent with a few parameters.

public void setIntent(Class to, String key, String string) 
 Intent intent = new Intent(this, to);
 intent.putExtra(key, string);
 startActivity(intent);

That was my primary idea but it isn't working. I'm not able to pass a class and I don't know if and how I could maybe pass an ajustable amount of extras with different variables.

Thanks!

 // Generalized method
 private void startActivityGeneral(final Class<? extends Activity> activityToOpen , Bundle parameters)
 Intent intent = new Intent(getBaseContext() , activityToOpen);
 for (String key : parameters.keySet()) 
 String params_key = key;
 String params_value = parameters.get(key).toString();
 // to bundle parameters based on type
 intent.putExtra(params_key ,params_value);
 
 startActivity(intent);


 //Calling
 Bundle data = new Bundle();
 data.putString("key1" , "value1");
 data.putString("key2" , "value2");
 startActivityGeneral(Main2Activity.class , data);
 //startActivityGeneral(Main3Activity.class , data);

For adjustable amount of extras with different variables - Use Bundle

You can create something like this.

public void setIntent() 
Intent intent = new Intent(YourActivity.this, ActivityToGo.class);
intent.putExtra(key, "test");
startActivity(intent);

And then only you call this method wherever you want.

your idea is correct but you should pass nameActivity.class as parameter

 setIntent(nameActivity.class,"key","hello");
 ************************************************
 public void setIntent(Class to, String key, String string) {
 Intent intent = new Intent(this, to);
 intent.putExtra(key, string);
 startActivity(intent);