Android中fragment与activity之间的交互（两种实现方式）

import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
/**
 * Created by panchengjia on 2016/12/18.
 */
public class RightFragment extends Fragment {
 public RightFragment() {
 }
 /*Fragment的传参方式(通过Bundle对象来传递)
 *采用这种传参方式可以保证用户在横竖屏切换时所
 * 传递的参数不会丢失
 */
 public static RightFragment getInstance(String data){
 RightFragment rightFragment = new RightFragment();
 Bundle bundle = new Bundle();
 //将需要传递的字符串以键值对的形式传入bundle
 bundle.putString("data",data);
 rightFragment.setArguments(bundle);
 return rightFragment;
 }
 @Override
 public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 }
 @Override
 public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
 View view =inflater.inflate(R.layout.right_layout,container,false);
 TextView tv = (TextView) view.findViewById(R.id.tv);
 String data = getArguments().getString("data");
 tv.setText(data);
 return view;
 }
 @Override
 public void onPause() {
 super.onPause();
 }
}

import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class Main3Activity extends AppCompatActivity {
 FragmentManager fragmentManager;
 FragmentTransaction fragmentTransaction;
 LeftFragment leftFragment;
 Button panhouye,bikonghai;//声明leftfragment中的按钮
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main2);
 //获取fragmentManager
 fragmentManager=getFragmentManager();
 //通过findFragmentById找到leftFragment
 leftFragment = (LeftFragment) fragmentManager.findFragmentById(R.id.left);
 //找到对应的导航按钮并设置点击事件
 panhouye = (Button) leftFragment.getView().findViewById(R.id.panhouye);
 bikonghai = (Button) leftFragment.getView().findViewById(R.id.bikonghai);
 panhouye.setOnClickListener(new View.OnClickListener() {
 @Override
 public void onClick(View v) {
 //调用方法修改rightfragment中的文本内容
 switchButton("我是潘侯爷");
 }
 });
 bikonghai.setOnClickListener(new View.OnClickListener() {
 @Override
 public void onClick(View v) {
 switchButton("我是碧空海");
 }
 });
 //设置打开Activity后rightfragment中默认的文本内容
 switchButton("我是潘侯爷");
 }
 //定义方法填充Activity右侧的fragment，并通过传参修改文本内容
 public void switchButton(String data){
 fragmentManager=getFragmentManager();
 fragmentTransaction=fragmentManager.beginTransaction();
 //通过调用RightFragment中的getInstance方法传修改文本
 RightFragment rightFragment =RightFragment.getInstance(data);
 //此时使用add方法会造成右侧fragment中文本重叠（未设置BackGround时）
 fragmentTransaction.replace(R.id.right,rightFragment);
 fragmentTransaction.commit();
 }
}

import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
/**
 * Created by panchengjia on 2016/12/18.
 */
public class LeftFragment extends Fragment implements View.OnClickListener{
 //声明内部定义的回调接口
 CallBackListener callBackListener;
 //声明布局中事件触发按钮
 Button panhouye,bikonghai;
 @Override
 public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 //通过getActivity()获取用于回调修改文本方法的接口
 callBackListener= (CallBackListener) getActivity();
 }
 @Override
 public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
 View view =inflater.inflate(R.layout.left_layout,container,false);
 panhouye = (Button) view.findViewById(R.id.panhouye);
 bikonghai= (Button) view.findViewById(R.id.bikonghai);
 panhouye.setOnClickListener(this);//为按钮设置监听事件
 bikonghai.setOnClickListener(this);
 return view;
 }
 @Override
 public void onPause() {
 super.onPause();
 }
 @Override
 public void onClick(View v) {
 switch (v.getId()){
 case R.id.panhouye:
 callBackListener.setText("我是潘侯爷");
 break;
 case R.id.bikonghai:
 callBackListener.setText("我是碧空海");
 break;
 }
 }
 //设置用于修改文本的回调接口
 public static interface CallBackListener{
 public void setText(String data);
 }
}

import android.app.Fragment;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
/**
 * Created by panchengjia on 2016/12/18.
 */
public class RightFragment extends Fragment {
 //声明fragment中的TextView，用于建立修改文本的方法
 private TextView tv;
 @Override
 public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 }
 @Override
 public void onPause() {
 super.onPause();
 }
 @Nullable
 @Override
 public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
 View view =inflater.inflate(R.layout.right_layout,container,false);
 tv = (TextView) view.findViewById(R.id.tv);
 return view;
 }
 //在这里设置修改自身文本的方法
 public void setFragmentText(String data){
 tv.setText(data);
 }
}

import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
public class MainActivity extends AppCompatActivity implements LeftFragment.CallBackListener{
 FragmentManager fragmentManager;
 FragmentTransaction fragmentTransaction;
 /*leftfragment已经在主布局文件中声明，
 *这里仅需要通过代码声明部署rightFragment
 */
 RightFragment rightFragment;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 //初始化主布局（主要目的是为主布局填充fragments）
 initActivity();
 }
 private void initActivity() {
 fragmentManager = getFragmentManager();
 fragmentTransaction = fragmentManager.beginTransaction();
 rightFragment = new RightFragment();
 fragmentTransaction.add(R.id.right,rightFragment);
 fragmentTransaction.commit();
 }
 //接口实现方法，用于回调RightFragment类中定义的修改文本的方法
 @Override
 public void setText(String data) {
 rightFragment.setFragmentText(data);
 }
}