Fragment 的使用

android:orientation="vertical"

tools:context=".MainActivity">

<fragment

android:id="@+id/one"

class="com.wust.twofragrement.OneFragrement"

android:layout_width="match_parent"

android:layout_height="300dp"/>

<fragment

android:id="@+id/two"

class="com.wust.twofragrement.TwoFragrement"

android:layout_width="match_parent"

android:layout_height="300dp"/>

</LinearLayout>

注意：这个 fragment 一定要加 id，要不然会报如下错误

Caused by: android.view.InflateException: Binary XML file line #14 in com.wust.twofragrement:layout/activity_main: Binary XML file line #14 in com.wust.twofragrement:layout/activity_main: Error inflating class fragment

• 第二步，编写 fragment 类代码

package com.wust.twofragrement;

import android.app.Fragment;

import android.os.Bundle;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import androidx.annotation.NonNull;

import androidx.annotation.Nullable;

/**

• ClassName: OneFragrement <br/>

• Description: <br/>

• date: 2021/5/27 16:26<br/>

• @author yiqi<br />

• @email：1820762465@qq.com

• @QQ：1820762465

• @since JDK 1.8

*/

public class OneFragrement extends Fragment {

@Nullable

@Override

public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

View view = inflater.inflate(R.layout.fragrement_one, null);

return view;

}

}

package com.wust.twofragrement;

import android.app.Fragment;

import android.os.Bundle;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import androidx.annotation.NonNull;

import androidx.annotation.Nullable;

/**

• ClassName: OneFragrement <br/>

• Description: <br/>

• date: 2021/5/27 16:26<br/>

• @author yiqi<br />

• @email：1820762465@qq.com

• @QQ：1820762465

• @since JDK 1.8

*/

public class TwoFragrement extends Fragment {

@Nullable

@Override

public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

View view = inflater.inflate(R.layout.fragrement_two, null);

return view;

}

}

注意：在这一步中你引入的 fragment 包要正确，一定要是 android.app.Fragment; 另外一个是?androidx.fragment.app.Fragment; 在这种静态调用方法里，两个包任选其一即可。

动态调用?

• 第一步，编写 xml 布局文件，使用?FrameLayout 占位

<?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=".MainActivity">

<FrameLayout

android:id="@+id/fl_one"

android:layout_width="match_parent"

android:layout_height="300dp"/>

<FrameLayout

android:id="@+id/fl_two"

android:layout_width="match_parent"

android:layout_height="300dp"/>

</LinearLayout>

• 第二步，编写 fragment 类代码

package com.wust.twofragrement;

import android.app.Fragment;

import android.os.Bundle;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import androidx.annotation.NonNull;

import androidx.annotation.Nullable;

/**

• ClassName: OneFragrement <br/>

• Description: <br/>

• date: 2021/5/27 16:26<br/>

• @author yiqi<br />

• @email：1820762465@qq.com

• @QQ：1820762465

• @since JDK 1.8

*/

public class OneFragrement extends Fragment {

@Nullable

@Override

public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

View view = inflater.inflate(R.layout.fragrement_one, null);

return view;

}

}

package com.wust.twofragrement;

import android.app.Fragment;

import android.os.Bundle;

import android.view.LayoutInflater;

import android.view.View;

import andr

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oid.view.ViewGroup;

import androidx.annotation.NonNull;

import androidx.annotation.Nullable;

/**

• ClassName: OneFragrement <br/>

• Description: <br/>