Fragment之间传值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);    }}