无涯教程-Android - Single frame fragments函数 Single frame fragme

Single frame fragment是为小屏幕设备(如手持设备)设计的,并且应高于android 3.0版本。

示例

本示例将向您说明如何创建自己的fragment。在这里，我们将创建两个fragment，其中一个fragment将在设备处于横向模式时使用，另一个fragment将在纵向模式下使用。

以下是修改后的主要Activity文件 MainActivity.java 的内容-

package com.example.myfragments;
import android.app.Activity;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.content.res.Configuration;
import android.os.Bundle;
public class MainActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Configuration config = getResources().getConfiguration();
  </span><span class="typ">FragmentManager</span><span class="pln"> fragmentManager </span><span class="pun">=</span><span class="pln"> getFragmentManager</span><span class="pun">();</span><span class="pln">
  </span><span class="typ">FragmentTransaction</span><span class="pln"> fragmentTransaction </span><span class="pun">=</span><span class="pln"> fragmentManager</span><span class="pun">.</span><span class="pln">beginTransaction</span><span class="pun">();</span><span class="pln">

  </span><span class="com">/**
     * Check the device orientation and act accordingly
  */</span><span class="pln">
	
  </span><span class="kwd">if</span><span class="pln"> </span><span class="pun">(</span><span class="pln">config</span><span class="pun">.</span><span class="pln">orientation </span><span class="pun">==</span><span class="pln"> </span><span class="typ">Configuration</span><span class="pun">.</span><span class="pln">ORIENTATION_LANDSCAPE</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
     </span><span class="com">/**
        * Landscape mode of the device
     */</span><span class="pln">
     LM_Fragement ls_fragment </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">new</span><span class="pln"> LM_Fragement</span><span class="pun">();</span><span class="pln">
     fragmentTransaction</span><span class="pun">.</span><span class="pln">replace</span><span class="pun">(</span><span class="pln">android</span><span class="pun">.</span><span class="pln">R</span><span class="pun">.</span><span class="pln">id</span><span class="pun">.</span><span class="pln">content</span><span class="pun">,</span><span class="pln"> ls_fragment</span><span class="pun">);</span><span class="pln">
  </span><span class="pun">}</span><span class="kwd">else</span><span class="pun">{</span><span class="pln">
     </span><span class="com">/**
        * Portrait mode of the device
     */</span><span class="pln">
     PM_Fragement pm_fragment </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">new</span><span class="pln"> PM_Fragement</span><span class="pun">();</span><span class="pln">
     fragmentTransaction</span><span class="pun">.</span><span class="pln">replace</span><span class="pun">(</span><span class="pln">android</span><span class="pun">.</span><span class="pln">R</span><span class="pun">.</span><span class="pln">id</span><span class="pun">.</span><span class="pln">content</span><span class="pun">,</span><span class="pln"> pm_fragment</span><span class="pun">);</span><span class="pln">
  </span><span class="pun">}</span><span class="pln">
  fragmentTransaction</span><span class="pun">.</span><span class="pln">commit</span><span class="pun">();</span><span class="pln">

}
}

创建两个fragment文件 LM_Fragement.java 和 PM_Fragment.java

以下是 LM_Fragement.java 文件的内容-

package com.example.myfragments;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
/**

Created by LearnFk7 on 8/23/2016.
*/

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

以下是 PM_Fragement.java 文件的内容-

package com.example.myfragments;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
/**

Created by LearnFk7 on 8/23/2016.
*/

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

在 res/layout 目录下创建两个布局文件 lm_fragement.xml 和 pm_fragment.xml ，以下是 lm_fragement.xml 文件的内容-

<?xml version="1.0" encoding="utf-8"?>
   <LinearLayout
      xmlns:android="http://schemas.android.com/apk/res/android"
      android:orientation="vertical"
      android:layout_width="fill_parent"
      android:layout_height="fill_parent"
      android:background="#7bae16">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/landscape_message"
android:textColor="#000000"
android:textSize="20px" />
<!-- More GUI components go here  -->
</LinearLayout>

以下是 pm_fragment.xml 文件的内容-

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
   xmlns:android="http://schemas.android.com/apk/res/android"
   android:orientation="horizontal"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   android:background="#666666">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/portrait_message"
android:textColor="#000000"
android:textSize="20px" />
<!-- More GUI components go here  -->
</LinearLayout>

以下是 res/layout/activity_main.xml 文件的内容,其中包括您的fragment-

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:tools="http://schemas.android.com/tools"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   android:orientation="horizontal">
<fragment
android:name="com.example.fragments"
android:id="@+id/lm_fragment"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="match_parent" />
<fragment
android:name="com.example.fragments"
android:id="@+id/pm_fragment"
android:layout_weight="2"
android:layout_width="0dp"
android:layout_height="match_parent" />
</LinearLayout>

确保您具有 res/values/strings.xml 文件的以下内容-

<?xml version="1.0" encoding="utf-8"?>
<resources>
   <string name="app_name">My Application</string>
   <string name="landscape_message">This is Landscape mode fragment</string>
   <string name="portrait_message">This is Portrait mode fragment></string>
</resources>

让我们尝试运行刚刚创建的修改后的 MyFragments 应用程序，我假设您在进行环境设置时创建了 AVD 。要从Android Studio运行该应用,请打开您项目的Activity文件之一,然后从工具栏中单击"运行"图标。 Android Studio将应用程序安装在您的AVD上并启动它,如果设置和应用程序一切正常,它将显示"Emulator"窗口,您将在其中单击"菜单"按钮以查看以下窗口。请耐心等待,因为这可能要花一些时间,具体取决于您的计算机速度-

要更改仿真器屏幕的模式,请执行以下操作-

fn + control + F11 可以将横向更改为纵向,反之亦然。
ctrl + F11 。
ctrl + F11 。

更改模式后,您将能够看到为横向模式实现的GUI,如下所示-

这样,您可以通过不同的fragment使用相同的Activity,但使用不同的GUI。您可以根据需要将不同类型的GUI组件用于不同的GUI。

无涯教程-Android - Single frame fragments函数

示例

参考链接