Android Fragment(二)

废话:在上一篇的博客中我们给出了Fragment的简单介绍,这一片博客给大家介绍一下Fragment到底该怎样用。主要都用在哪方面等等。

需求:现有一个界面,要求,竖屏时界面的背景颜色为红色,横屏时界面的的背景颜色为黄色。(主要目的是为了给大家演示一下Fragment实现动态UI效果)

直接看代码好了:

一、背景颜色为红色的Fragment

package com.yw.myapiupdate.fragment;

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

import com.yw.myapiupdate.R;

@SuppressLint("NewApi")
public class FragmentRed extends Fragment{
    
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragmentred, container,false);
    }
}

红色布局:

<?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:orientation="vertical" >
    
<TextView 
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#ff0000"
    android:text="这是一个fragment的测试程序"/>
</LinearLayout>

二、背景颜色为黄色的Fragment

package com.yw.myapiupdate.fragment;

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

import com.yw.myapiupdate.R;

@SuppressLint("NewApi")
public class FragmentYellow extends Fragment{
    
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragmentyellow, container,false);
    }
}

黄色布局:

<?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:orientation="vertical" >
    <TextView 
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:text="这是一个fragment的测试程序"
    android:background="#ffff00"/>

</LinearLayout>

三、承载这两个布局的Activity

package com.yw.myapiupdate.fragment;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.os.Bundle;
import android.view.Display;

import com.yw.myapiupdate.R;

@SuppressLint("NewApi")
public class MainActivity extends Activity{
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fragment_layout);
        Display display = getWindowManager().getDefaultDisplay();
        if(display.getWidth() > display.getHeight()){
            FragmentRed red = new FragmentRed();
            getFragmentManager().beginTransaction().replace(R.id.fragment_linear_layout, red).commit();
        }else{
            FragmentYellow yellow = new FragmentYellow();
            getFragmentManager().beginTransaction().replace(R.id.fragment_linear_layout, yellow).commit();
        }
    }
}

主文件布局:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/fragment_linear_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal" 
    android:baselineAligned="false">
</LinearLayout>
原文地址:https://www.cnblogs.com/tony-yang-flutter/p/3389536.html