[android] 02_动态创建fragment - Android 4.0 Documentation

需求：横屏：显示fragmenthorizontal 竖屏:显示fragmentvertical
android.R.id.content 代表当前Activity的id(固定写法)

1、布局
a) /res/layout/fragment_horizontal.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:gravity="center"

android:orientation="vertical" >

<Button

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="这个是横屏fragment" />

</LinearLayout>

b) /res/layout/fragment_vertical.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:gravity="center"

android:orientation="vertical" >

<Button

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="这个是竖屏fragment" />

</LinearLayout>

c) /res/layout/activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="horizontal">

</LinearLayout>

2、核心代码
a) FragmentHorizontal.java

package cn.zengfansheng.dynamicfragment;

import android.app.Fragment;

import android.os.Bundle;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

public class FragmentHorizontal extends Fragment {

@Override

public View onCreateView(LayoutInflater inflater, ViewGroup container,

Bundle savedInstanceState) {

return inflater.inflate(R.layout.fragment_vertical, null);

}

b) FragmentVertical.java

package cn.zengfansheng.dynamicfragment;

import android.app.Fragment;

import android.os.Bundle;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

public class FragmentVertical extends Fragment {

@Override

public View onCreateView(LayoutInflater inflater, ViewGroup container,

Bundle savedInstanceState) {

return inflater.inflate(R.layout.fragment_horizontal, null);

}

c) MainActivity.java

package cn.zengfansheng.dynamicfragment;

import android.app.Activity;

import android.app.FragmentManager;

import android.app.FragmentTransaction;

import android.os.Bundle;

import android.view.Display;

import android.view.WindowManager;

public class MainActivity extends Activity {

@SuppressWarnings("deprecation")

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

// 需求：横屏：显示fragmenthorizontal 竖屏:显示fragmentvertical

// 1、获取FragmentManager对象

FragmentManager fragmentManager = this.getFragmentManager();

// 2、开启事务

FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();

// 3、获取手机的屏幕尺寸

WindowManager windowManager = this.getWindowManager();

Display defaultDisplay = windowManager.getDefaultDisplay();

int windowWidth = defaultDisplay.getWidth();

int windowHeight = defaultDisplay.getHeight();

// 4、判断横竖屏幕

if (windowWidth>windowHeight) {//横屏

//显示fragmenthorizontal

fragmentTransaction.replace(android.R.id.content, new FragmentHorizontal());

}else {//竖屏

//显示fragmentvertical

fragmentTransaction.replace(android.R.id.content, new FragmentVertical(), null);

}

// 5、提交事务

fragmentTransaction.commit();

}

3、结果