Fragment之间的通信

一、布局代码

1.activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal"
    tools:context="com.example.tabfragment.MainActivity"
    tools:ignore="MergeRootFrame" >

    <fragment 
        android:id="@+id/fragment1"
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="match_parent"
        android:name="com.example.tabfragment.Fragment1"
        />
    
    <fragment 
        android:id="@+id/fragment2"
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="match_parent"
        android:name="com.example.tabfragment.Fragment2"
        />

</LinearLayout>

2.tab1.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#ff0000"
    android:orientation="vertical" >

    <Button 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/btnTest"
        android:text="修改另一个Fragment中View对象的值"/>

</LinearLayout>

3.tab2.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#00ff00"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="德国夺得2014年巴西世界杯冠军"
        android:textSize="30sp" />

</LinearLayout>

二、前台代码

1.MainActivity.java

package com.example.tabfragment;

import android.app.Activity;
import android.app.ActionBar;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.os.Build;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

}

2.Fragment1.java

package com.example.tabfragment;

import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;

public class Fragment1 extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.tab1, null);
        
        Button btnTest = (Button) view.findViewById(R.id.btnTest);
        btnTest.setOnClickListener(new View.OnClickListener() {
            
            @Override
            public void onClick(View v) {
                Fragment2 fragment = (Fragment2) getActivity().getFragmentManager().findFragmentById(R.id.fragment2);
                fragment.setTvText(String.valueOf(System.currentTimeMillis()));
            }
        });
        
        return view;
    }
}

3.Fragment2.java

package com.example.tabfragment;

import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

public class Fragment2 extends Fragment {
    
    private TextView tv;
    
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.tab2, null);
        
        tv = (TextView) view.findViewById(R.id.tv);
        
        return view;
    }
    
    public void setTvText(String text)
    {
        tv.setText(text);
    }
}

效果截图