Fragment的动态加载

xml布局文件

fragment_list.xml （控制fragment里面的内容）

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent" android:layout_height="match_parent"
    android:background="#ffff00">
    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:text="TextView"
        android:textColor="#000000"
        android:textSize="20sp"/>
</RelativeLayout>

Fragment的Java代码管理类

package com.administrator.fragmentdemo;

import android.content.Context;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

/**
 * 列表fragment
 */
public class ListFragment extends Fragment {
    //创建视图
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        //new view
        View view = inflater.inflate(R.layout.fragment_list,container,false);
        TextView textView = view.findViewById(R.id.textView);//需要根据根视图view进行findViewById
        textView.setText("hi");
        return view;
    }
    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
    }

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
    }

    @Override
    public void onStart() {
        super.onStart();
    }

    @Override
    public void onPause() {
        super.onPause();
    }

    @Override
    public void onStop() {
        super.onStop();
    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
    }
}

在容器activity_main.xml中为fragment设置可以展示的区域

分别设置了listContainer和detailContainer这两个容器

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.administrator.fragmentdemo.MainActivity">

   <LinearLayout
       android:orientation="horizontal"
       android:layout_width="match_parent"
       android:layout_height="match_parent">
      <LinearLayout
          android:id="@+id/listContainer"
          android:layout_width="150dp"
          android:layout_margin="1dp"
          android:layout_height="match_parent">
      </LinearLayout>
      <LinearLayout
          android:id="@+id/detailContainer"
          android:layout_width="200dp"
          android:layout_margin="1dp"
          android:layout_height="match_parent">
      </LinearLayout>
   </LinearLayout>

</LinearLayout>

装载Fragment的Activity的Java代码

package com.administrator.fragmentdemo;

import android.content.Context;
import android.content.Intent;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

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

        //1.container容器 2.fragment 3.fragment-->container把fragment放到容器container中去
        //getSupportFragmentManager()获取一个fragment容器，beginTransaction()开启一个事物,add()把fragment放进去(关联进去)。commit()向系统提交
        //R.id.listContainer,listContainer是刚才设置的容器id，add里面把容器和fragment关联
        ListFragment fragment = new ListFragment();
        getSupportFragmentManager()
                .beginTransaction()
                .add(R.id.listContainer,fragment)
                .commit();
        getSupportFragmentManager()
                .beginTransaction()
                .add(R.id.detailContainer,new ListFragment())
                .commit();
        //new ListFragment()新建一个fragment

//        //移除fragment
//        getSupportFragmentManager()
//                .beginTransaction()
//                .remove(fragment)
//                .commit();

//        //替换fragment
//        getSupportFragmentManager()
//                .beginTransaction()
//                .replace(R.id.listContainer,new ListFragment())
//                .commit();
    }

}