膨胀类片段时出错 - 简单片段代码不起作用

Question

在 Android 上运行简单的片段代码时出现错误。它甚至不显示布局，并在 logcat 中将异常输出为二进制 XML 文件第 #7 行（用于相对布局）和 #8（使用线性布局）

膨胀类片段时出错。

这是我的代码：

fragment1.xml

<?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" >

    <TextView
       android:id="@+id/textView1"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:layout_centerHorizontal="true"
       android:layout_centerVertical="true"
       android:text="Heyy Thats Fragment 1"
       android:textAppearance="?android:attr/textAppearanceLarge" />   

</RelativeLayout>

fragment1.java

package com.example.app1;

import android.os.Bundle;
import android.support.v4.app.Fragment;
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) {

            View view = inflater.inflate(R.layout.fragment1, container, false);
            return view;
    }
}

fragment2.xml

<?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" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:text="Heyy Thats Fragment 2"
        android:textAppearance="?android:attr/textAppearanceLarge" />   
</RelativeLayout> 

Fragment2.java

package com.example.app1;

import android.os.Bundle;
import android.support.v4.app.Fragment;
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) {
                View view = inflater.inflate(R.layout.fragment2, 
                container, false);

                return view;
   }
}

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".FragmentExampleActivity" >

    <fragment
        android:id="@+id/toolbar_fragment"
        android:name="com.example.app1.Fragment1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        tools:layout="@layout/fragment1" 
        class="com.example.app1.Fragment"/>

    <fragment
        android:id="@+id/text_fragment"
        android:name="com.example.app1.Fragment2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_centerVertical="true"
        tools:layout="@layout/fragment2" 
        class="com.example.app1.Fragment2"/>

</RelativeLayout>

MainActivity.java

package com.example.app1;

import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.view.Menu;

public class MainActivity extends FragmentActivity {

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

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
}

Manifest 包括所有 3 项活动！ Fragment1、Fragment2 和 MainActivity。

Answer 1

只需在 activity_main.xml 中查看 15 处的行

替换

class="com.example.app1.Fragment" with class="com.example.app1.Fragment1"

错过了“1”