錯誤使用碎片

Question

這是我的主要活動代碼

import android.app.Fragment; 
    import android.os.Bundle; 
    import android.view.LayoutInflater; 
    import android.view.View; 
    import android.view.ViewGroup; 
    public class FirstFragment extends Fragment{ 
@Override 
public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState){ 
    return inflater.inflate(R.layout.first_fragment_layout, container,false); 
} 

}

下面是我的activity_main.xml中文件containning兩個片段

<LinearLayout 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" > 

<fragment 
    android:name="com.softmya.fragments.FirstFragment" 
    android:id="@+id/firstFragment1" 
    android:layout_weight="1" 
    android:layout_width="0px" 
    android:layout_height="match_parent" /> 

<fragment 
    android:name="com.softmya.fragments.SecondFragment" 
    android:id="@+id/secondFragment2" 
    android:layout_weight="1" 
    android:layout_width="0px" 
    android:layout_height="match_parent" /> 

</LinearLayout> 

下面的代碼是針對代碼我的片段 FirstFragment.java

 package com.softmya.fragments; 

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

    public class FirstFragment extends Fragment{ 

@Override 
public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState){ 
    return inflater.inflate(R.layout.first_fragment_layout, container,false); 
} 

}

FirstFragment佈局

<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="fill_parent" 
android:layout_height="fill_parent" 
> 
<TextView 
android:id="@+id/lblFragment1" 
android:layout_width="fill_parent" 
android:layout_height="wrap_content" 
android:text="This is fragment #1" 
/> 
</LinearLayout> 

第二塊碎片碼也恰好類似於所述FirstFragment.java代碼除對於被充氣

錯誤日誌

類名和佈局

08-07 23:34:01.507: E/AndroidRuntime(23268): FATAL EXCEPTION: main 
    08-07 23:34:01.507: E/AndroidRuntime(23268): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.softmya.fragments/com.softmya.fragments.MainActivity}:  android.view.InflateException: Binary XML file line #6: Error inflating class fragment 
    08-07 23:34:01.507: E/AndroidRuntime(23268):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1967) 
    08-07 23:34:01.507: E/AndroidRuntime(23268):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1992) 
    08-07 23:34:01.507: E/AndroidRuntime(23268):  at android.app.ActivityThread.access$600(ActivityThread.java:127) 
    08-07 23:34:01.507: E/AndroidRuntime(23268):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1158) 
    08-07 23:34:01.507: E/AndroidRuntime(23268):  at android.os.Handler.dispatchMessage(Handler.java:99) 
    08-07 23:34:01.507: E/AndroidRuntime(23268):  at android.os.Looper.loop(Looper.java:137) 
    08-07 23:34:01.507: E/AndroidRuntime(23268):  at android.app.ActivityThread.main(ActivityThread.java:4448) 
    08-07 23:34:01.507: E/AndroidRuntime(23268):  at java.lang.reflect.Method.invokeNative(Native Method) 
    08-07 23:34:01.507: E/AndroidRuntime(23268):  at java.lang.reflect.Method.invoke(Method.java:511) 
    08-07 23:34:01.507: E/AndroidRuntime(23268):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:823) 
    08-07 23:34:01.507: E/AndroidRuntime(23268):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:590) 
    08-07 23:34:01.507: E/AndroidRuntime(23268):  at dalvik.system.NativeStart.main(Native Method) 
    08-07 23:34:01.507: E/AndroidRuntime(23268): Caused by: android.view.InflateException: Binary XML file line #6: Error inflating class fragment 
    08-07 23:34:01.507: E/AndroidRuntime(23268):  at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:697) 
    08-07 23:34:01.507: E/AndroidRuntime(23268):  at android.view.LayoutInflater.rInflate(LayoutInflater.java:739) 
    08-07 23:34:01.507: E/AndroidRuntime(23268):  at android.view.LayoutInflater.inflate(LayoutInflater.java:489) 
    08-07 23:34:01.507: E/AndroidRuntime(23268):  at android.view.LayoutInflater.inflate(LayoutInflater.java:396) 
    08-07 23:34:01.507: E/AndroidRuntime(23268):  at android.view.LayoutInflater.inflate(LayoutInflater.java:352) 
    08-07 23:34:01.507: E/AndroidRuntime(23268):  at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:255) 
    08-07 23:34:01.507: E/AndroidRuntime(23268):  at android.app.Activity.setContentView(Activity.java:1835) 
    08-07 23:34:01.507: E/AndroidRuntime(23268):  at com.softmya.fragments.MainActivity.onCreate(MainActivity.java:12) 
    08-07 23:34:01.507: E/AndroidRuntime(23268):  at android.app.Activity.performCreate(Activity.java:4465) 
    08-07 23:34:01.507: E/AndroidRuntime(23268):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049) 
    08-07 23:34:01.507: E/AndroidRuntime(23268):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1931) 
    08-07 23:34:01.507: E/AndroidRuntime(23268):  ... 11 more 
    08-07 23:34:01.507: E/AndroidRuntime(23268): Caused by: java.lang.ClassCastException:  com.softmya.fragments.FirstFragment cannot be cast to android.app.Fragment 
    08-07 23:34:01.507: E/AndroidRuntime(23268):  at android.app.Fragment.instantiate(Fragment.java:577) 
    08-07 23:34:01.507: E/AndroidRuntime(23268):  at android.app.Fragment.instantiate(Fragment.java:552) 
    08-07 23:34:01.507: E/AndroidRuntime(23268):  at android.app.Activity.onCreateView(Activity.java:4235) 
    08-07 23:34:01.507: E/AndroidRuntime(23268):  at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:673) 
    08-07 23:34:01.507: E/AndroidRuntime(23268):  ... 21 more 

Answer 1

嘗試將activity_main.xml更改爲如下所示

<LinearLayout 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" > 

<!--fragment--> 
<com.softmya.fragments.FirstFragment 
    android:id="@+id/firstFragment1" 
    android:layout_weight="1" 
    android:layout_width="0px" 
    android:layout_height="match_parent" /> 

<!--fragment--> 
<com.softmya.fragments.SecondFragment  
    android:id="@+id/secondFragment2" 
    android:layout_weight="1" 
    android:layout_width="0px" 
    android:layout_height="match_parent" /> 

</LinearLayout>