Error using onClickListener (Intent)

Question

Well, I'm trying to create an intent on a "login.java" the code is :

 Button btEntrar = (Button) findViewById(R.id.btnSingIn);
    btEntrar.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent i;
            i = new Intent(this, MainActivity.class);
            startActivity(i);


        }
    });

But it says that I can't go to the other activity saying this :

Error:(24, 21) error: no suitable constructor found for Intent(,Class) constructor Intent.Intent(String,Uri) is not applicable (argument mismatch; cannot be converted to String) constructor Intent.Intent(Context,Class) is not applicable (argument mismatch; cannot be converted to Context)

and...

Error:Execution failed for task ':app:compileDebugJava'. Compilation failed; see the compiler error output for details.

Answer 1

Just a few lines to explain the reason why this does not work in:

i = new Intent(this, MainActivity.class)

The intent is created inside another class, here an anonymous inner class OnClickListener. Thus this does not refer the instance of your Activity (or Context) as intended but the instance of your anonymous inner class OnClickListener.

So you should provide the correct context of your class.

i = new Intent(YourClassName.this, MainActivity.class)

Answer 2

use if you want to send it from login.java to mainactivity.class use

 Intent intent=new Intent(login.this,Mainactivity.class);
startActivity(intent);

Answer 3

updated code in to your activity

Button btEntrar = (Button) findViewById(R.id.btnSingIn);
 btEntrar.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        Intent i;
        i = new Intent(login.this, MainActivity.class);
        startActivity(i);


    }
});