xml layout file
fragment_list.xml (controls the content in the fragment)
<?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's Java code management class
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;
/**
* list fragment
*/
public class ListFragment extends Fragment {
public static final String BUNDLE_TITLE = "bundle_title";
private String mTitle = "mo_ren_zhi";
public static ListFragment newInstance(String title){
ListFragment fragment = new ListFragment();
Bundle bundle = new Bundle();//Create a bundle object to encapsulate the data
bundle.putString(BUNDLE_TITLE,title);//put it, there are a lot of basic data such as char, int, such as String(key,Value) here, you can also putChar();
fragment.setArguments(bundle);//Pass the packaged bundle data through the setArgument method of fragment.
return fragment;
}
//create view
@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);//FindViewById needs to be performed according to the root view view
textView.setText(mTitle);
textView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(mOnTitleClickListener!=null){
mOnTitleClickListener.onClick(mTitle);
}
}
});
return view;
}
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if(getArguments() != null){
mTitle = getArguments().getString(BUNDLE_TITLE);
}
}
// method to set the interface
public void setOnTitleClickListener(OnTitleClickListener onTitleClickListener){
mOnTitleClickListener = onTitleClickListener;
}
//define variable
private OnTitleClickListener mOnTitleClickListener;
/**
* When the title is clicked, pass the title out
*/
//Define the interface
public interface OnTitleClickListener{
void onClick(String title);
}
}
Set the displayable area for the fragment in the container activity_main.xml
Set up the two containers listContainer and detailContainer respectively
<?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">
<TextView
android:id="@+id/textView"
android:layout_width="match_parent"
android:layout_height="100dp"
android:gravity="center"
android:text="static load fragment"/>
<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>
The Java code of the Activity that loads the Fragment
package com.administrator.fragmentdemo;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
public class MainActivity extends AppCompatActivity implements ListFragment.OnTitleClickListener{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//1.container container 2.fragment 3.fragment-->container put the fragment into the container container
//getSupportFragmentManager() gets a fragment container, beginTransaction() opens a thing, and add() puts the fragment in (associated with it). commit() submit to the system
//R.id.listContainer, listContainer is the container id just set, and add associates the container with the fragment
//fragment---> activity value fragment passes value to activity
ListFragment listFragment = ListFragment.newInstance("list");
getSupportFragmentManager()
.beginTransaction()
.add(R.id.listContainer,listFragment)
.commit();
listFragment.setOnTitleClickListener(this);
ListFragment detail = new ListFragment().newInstance("detail");
getSupportFragmentManager()
.beginTransaction()
.add(R.id.detailContainer,detail)
.commit();
detail.setOnTitleClickListener(this);
}
@Override
public void onClick(String title) {
setTitle(title);
}
}
For example, when you want to pass an object, you can't use bundle to pass it
Change the ListFragment.java file
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;
/**
* list fragment
*/
public class ListFragment extends Fragment {
public static final String BUNDLE_TITLE = "bundle_title";
private String mTitle = "mo_ren_zhi";
/**
* Build the simulated User object
*/
private User mUser;
public void setUser(User user){
mUser = user;
}
public class User{
}
public static ListFragment newInstance(String title,User user){//Add User parameter
ListFragment fragment = new ListFragment();
Bundle bundle = new Bundle();//Create a bundle object to encapsulate the data
bundle.putString(BUNDLE_TITLE,title);//put it, there are a lot of basic data such as char, int, such as String(key,Value) here, you can also putChar();
fragment.setArguments(bundle);//Pass the packaged bundle data through the setArgument method of fragment.
fragment.setUser(user);//Set the User object
return fragment;
}
//create view
@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);//FindViewById needs to be performed according to the root view view
textView.setText(mTitle);
textView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(mOnTitleClickListener!=null){
mOnTitleClickListener.onClick(mTitle);
}
}
});
return view;
}
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if(getArguments() != null){
mTitle = getArguments().getString(BUNDLE_TITLE);
}
}
// method to set the interface
public void setOnTitleClickListener(OnTitleClickListener onTitleClickListener){
mOnTitleClickListener = onTitleClickListener;
}
//define variable
private OnTitleClickListener mOnTitleClickListener;
/**
* When the title is clicked, pass the title out
*/
//Define the interface
public interface OnTitleClickListener{
void onClick(String title);
}
}