较低的Andr​​oid API片段 [英] Android Fragments on lower API

问题描述

以及我开始了解Android的碎片，但是这仍然是困惑我。我需要一点点帮助。因为它说Android的碎片，因为API级别11支持，但你可以下载support.v4库打包较低级别的API。那么首先我创建新的项目，试穿API级别15.然后片段我与API级别8相同，这是行不通的。我引入的外部罐子，它认为所有需要的进口，因为它应该...什么似乎是这里的问题？

well I'm starting to understand Android Fragments but this is still confusing for me. I need a little help. As it says android fragments is supported since API level 11 but you can download "support.v4" libraries pack for lower level APIs. Well first I create new project to try fragments on API level 15. Then I did the same with API level 8 and it does not work... I imported external jar and it sees all needed import as it should... What seems to be the problem here?

下面是我的主类：

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

public class Fragment2Activity extends FragmentActivity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }
}

我主要布局XML：

My main layout XML:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />

        <fragment 
   android:name="com.frag.Fragment2.frag"
   android:id="@+id/frag"
   android:layout_width="match_parent"
   android:layout_height="match_parent" />

</LinearLayout>

我的片段类：

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class frag extends Fragment {
       @Override
       public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
          // Inflate the layout for this fragment
          View v = inflater.inflate(R.layout.hello_fragment, container, false);
          return v;
       }
    }

和我的片段布局XML：

And my fragment layout XML:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    <TextView
   android:layout_width="fill_parent"
   android:layout_height="match_parent"
   android:text="THIS IS FRAGMENT"
   android:background="@drawable/ic_launcher"
/>

</LinearLayout>

固定

推荐答案

您还在使用 android.view.fragment 类，它不存在。你必须切换到 android.support.v4.app.fragment 旧设备上。

You are still using the android.view.fragment class, which does not exist. You have to switch to android.support.v4.app.fragment on older devices.

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