前一遍文章我们讲了静态创建Fragment,这个在实际的开发中几乎不用,都是动态创建的,所谓动态创建就是根据某个条件动态创建Fragment,

现在创建一个android项目 dynamicFragment

MainActivity.java

package com.example.dynamicfragment;

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

public class MainActivity extends Activity {

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

		WindowManager wm = getWindowManager();

		int width = wm.getDefaultDisplay().getWidth();
		int height = wm.getDefaultDisplay().getHeight();
		// 1.获取fragment的管理器
		FragmentManager fm = getFragmentManager();
		// 2.管理里面的fragment 开启事务 保证界面更新 同时成功 或者 同时失败
		FragmentTransaction ft = fm.beginTransaction();
		if (height > width) {
			// 竖屏
			// android.R.id.content 代表的是当前的应用的activity
			ft.replace(android.R.id.content, new Fragment1());

		} else {
			// 横屏
			// android.R.id.content 代表的是当前的应用的activity
			ft.replace(android.R.id.content, new Fragment2());
		}
		ft.commit();
	}
}

package com.example.dynamicfragment;


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

public class Fragment1 extends Fragment {

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {
		
		return inflater.inflate(R.layout.fragment1, null);
	}
}

package com.example.dynamicfragment;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class Fragment2 extends Fragment {
	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {
		
		return inflater.inflate(R.layout.fragment2, null);
	}
}

android 动态创建Fragment