Activity和Fragment之间通信

MainActivity4代码（Activity-Fragment通信）
 1 package fragmentdemo.example.administrator.fragmentdemo;

import android.app.Activity;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

/**
 * Created by Administrator on 2016/5/7.
 */
public class MainActivity4 extends Activity {
    private Button send;
    private EditText editText;

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.main4);
        send= (Button) findViewById(R.id.send);
        editText= (EditText) findViewById(R.id.editText);
        send.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String text=editText.getText().toString();
                MyFragment5 myFragment5=new MyFragment5();/*新建myFragment*/
                Bundle bundle=new Bundle();/*创建Bundle数据包*/
                bundle.putString("name",text);
                myFragment5.setArguments(bundle);/*调用setArguments(bundle)方法*/
                FragmentManager fragmentManager = getFragmentManager();/*获得FragmentManager管理者*/
                FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();/*开启一个事务*/
                fragmentTransaction.add(R.id.layout,myFragment5,"myFragment5");
                fragmentTransaction.commit();/*提交事务*/
                Toast.makeText(MainActivity4.this,"向Fragment发送数据"+text,Toast.LENGTH_SHORT).show();
            }
        });
    }
}

Main方法

package fragmentdemo.example.administrator.fragmentdemo;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.content.Intent;
import android.os.Bundle;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
/*1）Fragment可以作为Activity界面的一部分组成出现；
        （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；
        （3）在Activity运行过程中，可以添加、移除或替换Fragment；
        （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；
        （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）；
        Fragment两种加载方式：静态加载、动态加载。*/

public class MainActivity extends Activity implements OnCheckedChangeListener
{

    private RadioGroup group;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        group = (RadioGroup) findViewById(R.id.radiogroup);
        group.setOnCheckedChangeListener(this);

    }

    @Override
    public void onCheckedChanged(RadioGroup group, int checkedId) {
        // TODO Auto-generated method stub

        switch (checkedId) {
            case R.id.first: {
                Intent intent=new Intent(this,MainActivity2.class);
                startActivity(intent);
                break;

            }
            case R.id.second: {
               /*Fragment 动态加载*/
                MyFragment2 myFragment2=new MyFragment2();/*创建实例*/
                FragmentManager fragmentManager = getFragmentManager();/*获取到FragmentManager*/
                FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();/*开启事务*/
                fragmentTransaction.add(R.id.frame,myFragment2);
                fragmentTransaction.addToBackStack(null);/*通过物理返回键返回*/
                fragmentTransaction.commit();/*提交事务*/


                break;
            }
            case R.id.thrid: {
                Intent intent=new Intent(this,MainActivity3.class);
                startActivity(intent);
                break;


            }
            case R.id.fourth: {
                Intent intent=new Intent(this,MainActivity4.class);
                startActivity(intent);
                break;


            }
        }
    }

MyFragment5（Fragment-Activity通信）

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;
    }
}

main4.xml代码（LinearLayout代码）

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/layout">
<EditText
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/editText"/>
<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="发送"
    android:id="@+id/send"/>
</LinearLayout>

在AndroidManifest中进行注册

<activity android:name=".MainActivity4"></activity>