简介:
为什么要用Fragment?使用Fragment可以在一个Activity中实现不同的界面。Fragment与Fragment之间的动画切换,远比Activity与Activity之间的动画切换变化方式多。很多时候,我们通过使用一个Activity,切换多个Fragment。本次博客,主要列举一下Fragment与它的Activity之间进行数据交换的方式。
1.Fragment中通过getActivity()然后进行强制转化,调用Activity中的公有方法
((XXXXActivity)getActivity()).fun();
2.Activity在切换Fragment的时候,通过setArguments向Fragment传递参数,Fragment通过getArguments();获得从activity中传递过来的值
3.Activity实现一个接口,Fragment在onAttach方法中,将该Activity转化为该接口,在需要调用的时候回调。
注意:本Demo是通过FragmentManager来管理Fragment的,通过FragmentManager管理,我们创建Fragment和销毁Fragment的时候,可以通过栈的方式:
a.FragmentTransaction的add方法,添加一个Fragment
b.FragmentTransaction的popBackStack()弹出该Fragment
演示实例:
fragment1.xml
- <RelativeLayout 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:background="#FFFFFFFF"
- android:paddingBottom="@dimen/activity_vertical_margin"
- android:paddingLeft="@dimen/activity_horizontal_margin"
- android:paddingRight="@dimen/activity_horizontal_margin"
- android:paddingTop="@dimen/activity_vertical_margin"
- tools:context="com.example.testfragment.MainActivity$PlaceholderFragment" >
- <TextView
- android:id="@+id/tv"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:layout_alignParentTop="true"
- android:text="fragment1" />
- <Button
- android:id="@+id/btn"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:layout_below="@id/tv"
- android:text="跳转到Fragment2" />
- </RelativeLayout>
MyFragment1.java
- /*
- * $filename: MyFragment.java,v $
- * $Date: 2014-5-16 $
- * Copyright (C) ZhengHaibo, Inc. All rights reserved.
- * This software is Made by Zhenghaibo.
- */
- package com.example.testfragment;
- import android.app.Activity;
- import android.os.Bundle;
- import android.support.v4.app.Fragment;
- import android.view.LayoutInflater;
- import android.view.View;
- import android.view.View.OnClickListener;
- import android.view.ViewGroup;
- import android.widget.Button;
- /*
- *@author: ZhengHaibo
- *web: http://blog.csdn.net/nuptboyzhb
- *mail: [email protected]
- *2014-5-16 Nanjing,njupt,China
- */
- public class MyFragment1 extends Fragment {
- FragmentCallBack fragmentCallBack = null;
- Button btn;
- @Override
- public View onCreateView(LayoutInflater inflater, ViewGroup container,
- Bundle savedInstanceState) {
- View rootView = inflater.inflate(R.layout.fragment1, container,
- false);
- btn = (Button)rootView.findViewById(R.id.btn);
- btn.setOnClickListener(new OnClickListener() {
- @Override
- public void onClick(View v) {
- // TODO Auto-generated method stub
- fragmentCallBack.callbackFun1(null);
- }
- });
- return rootView;
- }
- @Override
- public void onAttach(Activity activity) {
- // TODO Auto-generated method stub
- super.onAttach(activity);
- fragmentCallBack = (MainActivity)activity;
- }
- }
fragment2.xml
- <RelativeLayout 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:background="#FFFFFFFF"
- android:paddingBottom="@dimen/activity_vertical_margin"
- android:paddingLeft="@dimen/activity_horizontal_margin"
- android:paddingRight="@dimen/activity_horizontal_margin"
- android:paddingTop="@dimen/activity_vertical_margin"
- tools:context="com.example.testfragment.MainActivity$PlaceholderFragment" >
- <TextView
- android:id="@+id/tv"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:layout_alignParentTop="true"
- android:text="fragment2" />
- <Button
- android:id="@+id/btn1"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:layout_below="@id/tv"
- android:text="直接调用Activity" />
- <Button
- android:id="@+id/btn2"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:layout_below="@id/btn1"
-  
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