Activity和Fragment之間通訊

MainActivity4代碼（Activity-Fragment通訊）
 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();/*建立Bundle數據包*/
31                 bundle.putString("name",text);
32                 myFragment5.setArguments(bundle);/*調用setArguments(bundle)方法*/
33                 FragmentManager fragmentManager = getFragmentManager();/*得到FragmentManager管理者*/
34                 FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();/*開啓一個事務*/
35                 fragmentTransaction.add(R.id.layout,myFragment5,"myFragment5");
36                 fragmentTransaction.commit();/*提交事務*/
37                 Toast.makeText(MainActivity4.this,"向Fragment發送數據"+text,Toast.LENGTH_SHORT).show();
38             }
39         });
40     }
41 }

Main方法

 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能夠做爲Activity界面的一部分組成出現；
16         （2）能夠在一個Activity中同時出現多個Fragment，而且一個Fragment也能夠在多個Activity中使用；
17         （3）在Activity運行過程當中，能夠添加、移除或替換Fragment；
18         （4）Fragment能夠響應本身的輸入事件，而且有本身的聲明週期，它們的生命週期受宿主Activity的生命週期影響；
19         （5）Fragment在第一次繪製它的用戶界面時，系統會調用onCreateView()方法，此方法返回一個View。（若是不顯示UI，返回null）；
20         Fragment兩種加載方式：靜態加載、動態加載。*/
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 動態加載*/
50                 MyFragment2 myFragment2=new MyFragment2();/*建立實例*/
51                 FragmentManager fragmentManager = getFragmentManager();/*獲取到FragmentManager*/
52                 FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();/*開啓事務*/
53                 fragmentTransaction.add(R.id.frame,myFragment2);
54                 fragmentTransaction.addToBackStack(null);/*經過物理返回鍵返回*/
55                 fragmentTransaction.commit();/*提交事務*/
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     }

MyFragment5（Fragment-Activity通訊）

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代碼（LinearLayout代碼）

 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="發送"
14     android:id="@+id/send"/>
15 </LinearLayout>

在AndroidManifest中進行註冊

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