Android AlertDialog with EditText

MainActivity.java

final EditText input = new EditText(MainActivity.this);
                LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
                        LinearLayout.LayoutParams.MATCH_PARENT,
                        LinearLayout.LayoutParams.MATCH_PARENT);
                input.setLayoutParams(lp);
                new AlertDialog.Builder(MainActivity.this)
                        .setTitle("New Playlist")
                        .setPositiveButton("Create", new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int which) {
                            }
                        })
                        .setIcon(R.drawable.new_playlist)
                        .setView(input)
                        .show();