Activity和Fragment之间通信

MainActivity4代码（Activity-Fragment通信）
 1 package fragmentdemo.example.administrator.fragmentdemo;
 2 
 3 import android.app.Activity;
 4 import android.app.FragmentManager;
 5 import android.app.FragmentTransaction;
 6 import android.os.Bundle;
 7 import android.view.View;
 8 import android.widget.Button;
 9 import android.widget.EditText;
10 import android.widget.Toast;
11 
12 /**
13  * Created by Administrator on 2016/5/7.
14  */
15 public class MainActivity4 extends Activity {
16     private Button send;
17     private EditText editText;
18 
19     protected void onCreate(Bundle savedInstanceState) {
20 
21         super.onCreate(savedInstanceState);
22         setContentView(R.layout.main4);
23         send= (Button) findViewById(R.id.send);
24         editText= (EditText) findViewById(R.id.editText);
25         send.setOnClickListener(new View.OnClickListener() {
26             @Override
27             public void onClick(View v) {
28                 String text=editText.getText().toString();
29                 MyFragment5 myFragment5=new MyFragment5();/*新建myFragment*/
30                 Bundle bundle=new Bundle();/*创建Bundle数据包*/
31                 bundle.putString("name",text);
32                 myFragment5.setArguments(bundle);/*调用setArguments(bundle)方法*/
33                 FragmentManager fragmentManager = getFragmentManager();/*获得FragmentManager管理者*/
34                 FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();/*开启一个事务*/
35                 fragmentTransaction.add(R.id.layout,myFragment5,"myFragment5");
36                 fragmentTransaction.commit();/*提交事务*/
37                 Toast.makeText(MainActivity4.this,"向Fragment发送数据"+text,Toast.LENGTH_SHORT).show();
38             }
39         });
40     }
41 }

 1 package fragmentdemo.example.administrator.fragmentdemo;
 2 
 3 import java.util.ArrayList;
 4 import java.util.Iterator;
 5 import java.util.List;
 6 
 7 import android.app.Activity;
 8 import android.app.Fragment;
 9 import android.app.FragmentManager;
10 import android.app.FragmentTransaction;
11 import android.content.Intent;
12 import android.os.Bundle;
13 import android.widget.RadioGroup;
14 import android.widget.RadioGroup.OnCheckedChangeListener;
15 /*1）Fragment可以作为Activity界面的一部分组成出现；
16         （2）可以在一个Activity中同时出现多个Fragment，并且一个Fragment也可以在多个Activity中使用；
17         （3）在Activity运行过程中，可以添加、移除或替换Fragment；
18         （4）Fragment可以响应自己的输入事件，并且有自己的声明周期，它们的生命周期受宿主Activity的生命周期影响；
19         （5）Fragment在第一次绘制它的用户界面时，系统会调用onCreateView()方法，此方法返回一个View。（如果不显示UI，返回null）；
20         Fragment两种加载方式：静态加载、动态加载。*/
21 
22 public class MainActivity extends Activity implements OnCheckedChangeListener
23 {
24 
25     private RadioGroup group;
26 
27     @Override
28     protected void onCreate(Bundle savedInstanceState) {
29         // TODO Auto-generated method stub
30         super.onCreate(savedInstanceState);
31         setContentView(R.layout.activity_main);
32         group = (RadioGroup) findViewById(R.id.radiogroup);
33         group.setOnCheckedChangeListener(this);
34 
35     }
36 
37     @Override
38     public void onCheckedChanged(RadioGroup group, int checkedId) {
39         // TODO Auto-generated method stub
40 
41         switch (checkedId) {
42             case R.id.first: {
43                 Intent intent=new Intent(this,MainActivity2.class);
44                 startActivity(intent);
45                 break;
46 
47             }
48             case R.id.second: {
49                /*Fragment 动态加载*/
50                 MyFragment2 myFragment2=new MyFragment2();/*创建实例*/
51                 FragmentManager fragmentManager = getFragmentManager();/*获取到FragmentManager*/
52                 FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();/*开启事务*/
53                 fragmentTransaction.add(R.id.frame,myFragment2);
54                 fragmentTransaction.addToBackStack(null);/*通过物理返回键返回*/
55                 fragmentTransaction.commit();/*提交事务*/
56 
57 
58                 break;
59             }
60             case R.id.thrid: {
61                 Intent intent=new Intent(this,MainActivity3.class);
62                 startActivity(intent);
63                 break;
64 
65 
66             }
67             case R.id.fourth: {
68                 Intent intent=new Intent(this,MainActivity4.class);
69                 startActivity(intent);
70                 break;
71 
72 
73             }
74         }
75     }

package fragmentdemo.example.administrator.fragmentdemo;

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;
import android.widget.Toast;

/**
 * Created by Administrator on 2016/5/7.
 */
public class MyFragment5 extends Fragment {
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment2, container, false);
        TextView tv = (TextView) view.findViewById(R.id.text);
        String text=getArguments().get("name")+"";
        tv.setText(text);
        Toast.makeText(getActivity(),"已成功接收到"+text,Toast.LENGTH_SHORT).show();
        return view;
    }
}

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:orientation="vertical" android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:id="@+id/layout">
 6 <EditText
 7     android:layout_width="match_parent"
 8     android:layout_height="wrap_content"
 9     android:id="@+id/editText"/>
10 <Button
11     android:layout_width="wrap_content"
12     android:layout_height="wrap_content"
13     android:text="发送"
14     android:id="@+id/send"/>
15 </LinearLayout>