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public class MyActivity extends Activity {
EditText myText;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_my);

        myText = (EditText) findViewById(R.id.Result);
    }

    public void buttonPressed(View v)
    {
        int id=v.getId();
        Button pressed= (Button) v;
        String appendMe;
        switch (id)
        {
            // Strange specific cases
            case R.id.button11:
                // Canc button

            case R.id.button17:
                // Pi button


            default:   // Generic case
                appendMe=pressed.getText().toString();
                break;
        }
        // Add the string to the edit text
        myText.append(appendMe);
    }

    public void sendResult(View v)
    {
        String temp= myText.getText().toString();
        String temp2="https://m.wolframalpha.com/input/?i=";
        StringBuilder request=new StringBuilder();
        temp.trim();           // Remove spaces
        temp=Uri.encode(temp);  // Transform into uri format
        request.append(temp2);
        request.append(temp);

        // Avvio la webView
        Intent change=new Intent(this,Visualize.class);
        change.setData(Uri.parse(request.toString()));
        Toast.makeText(this,"inviato a :"+Uri.parse(request.toString()),Toast.LENGTH_SHORT).show();
        startActivity(change);
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.my, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

public class Visualize extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_visualize);

        Intent intent=getIntent();  // The intent that started this page
        Uri link=intent.getData();

        WebView web= (WebView) findViewById(R.id.webView);
        web.loadUrl(link.toString());
    }

}