Android Fragment与Activity之间的数据交换（Fragment从Activity获取数据）

Fragment与Activity之间的数据交换，通常含有3：

一、Fragment从Activity获取数据（仅本文介绍了一个第一）；

两、Activity从Fragment获取数据；

三、Fragment之间的数据访问。

实现效果图：

从Activity传递数据到两个Fragment中，Fragment获取数据后，展示出来。

源码：

布局文件：

activity_main:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" 
    android:orientation="horizontal">

    <LinearLayout
        android:id="@+id/left"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:layout_weight="2" 
        android:background="#CCCCCC">
    </LinearLayout>

    <LinearLayout
        android:id="@+id/right"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:orientation="vertical" 
        android:layout_weight="2">
    </LinearLayout>
   
</LinearLayout>

MyFragment1的布局文件f1:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal"
    tools:context=".MainActivity" >

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

MyFragment2的布局文件f2:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal"
    tools:context=".MainActivity" >

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

代码文件：

MainActivity：

package com.fragmentdemo5_commute;

import android.app.Activity;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.os.Bundle;

/**
 * 一、Fragment从Activity获取数据。

 */
public class MainActivity extends Activity {
	private FragmentManager manager;
	private FragmentTransaction transaction;

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

		manager = getFragmentManager();
		transaction = manager.beginTransaction();

		MyFragment1 fragment1 = new MyFragment1();
		Bundle bundle1 = new Bundle();
		bundle1.putString("id", "Activity发送给MyFragment1的数据");
		fragment1.setArguments(bundle1);
		transaction.replace(R.id.left, fragment1, "left");

		MyFragment2 fragment2 = new MyFragment2();
		Bundle bundle2 = new Bundle();
		bundle2.putString("id", "Activity发送给MyFragment2的数据");
		fragment2.setArguments(bundle2);
		transaction.replace(R.id.right, fragment2, "right");

		transaction.commit();
	}

}

MyFragment1：

package com.fragmentdemo5_commute;

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 MyFragment1 extends Fragment {
	@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.f1, null);
		
		TextView textView = (TextView) view.findViewById(R.id.textView);
		Bundle bundle1 = getArguments();
		textView.setText(bundle1.getString("id"));
		return view;
	}

}

MyFragment2：

package com.fragmentdemo5_commute;

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 MyFragment2 extends Fragment {
	@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.f2, null);
		
		TextView textView = (TextView) view.findViewById(R.id.textView);
		Bundle bundle2 = getArguments();
		textView.setText(bundle2.getString("id"));
		return view;
	}

}

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