Fragment之間傳值CallBack（MainActivity）

package com.bwie.fragmentcallback;

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class MainActivity extends FragmentActivity implements Fragment01.callBack{

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


    }

    @Override
    public void setTitle(String title) {
        FragmentManager manager = getSupportFragmentManager();
        Fragment02 fragment02 = (Fragment02) manager.findFragmentById(R.id.fragment02);
        fragment02.setText(title);
    }
}