基本片段布局的困难

时间:2011-11-08 16:44:03

标签: android android-fragments android-4.0-ice-cream-sandwich

我正试图让我的脑袋绕过碎片,以便为ICS准备好我的应用程序。

我有以下文件来获取您可以拥有的最基本的片段应用程序。它应该在启动时具有此功能:一个片段布局,文本视图为“片段1”,旁边是另一个带有“Fragment2”的片段布局。

我的包名是com.mwerner.fragments

我的档案是:

  • FragmentsActivity.java
  • ExamplesFragment.java
  • ExamplesFragment2.java
  • examples_fragment.xml
  • examples_fragment2.xml
  • main.xml

FragmentsActivity.java的代码是:

package com.mwerner.fragments;

import android.app.Activity;
import android.os.Bundle;

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

ExamplesFragment.java

package com.mwerner.fragments;

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

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

ExamplesFragment2.java

package com.mwerner.fragments;

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

public class ExamplesFragment2 extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.examples_fragment2, container, false);
    }
}

examples_fragment.xml文件只有一个带有textview的线性布局...... 这是main.xml的代码:

<?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" >
<fragment
        class="com.mwerner.fragments$ExamplesFragment"
        android:id="@+id/list"
        android:layout_weight="1"
        android:layout_width="0dp"
        android:layout_height="fill_parent"
         />

<fragment 
        class="com.mwerner.fragments$ExamplesFragment2"
        android:id="@+id/viewer"
        android:layout_weight="2"
        android:layout_width="0dp"
        android:layout_height="fill_parent" />


</LinearLayout>

应用程序在启动时因错误

而崩溃
11-07 18:12:12.519: E/AndroidRuntime(696): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mwerner.fragments/com.mwerner.fragments.FragmentsActivity}: android.view.InflateException: Binary XML file line #7: Error inflating class fragment
你能告诉我这里有什么问题吗?我几乎从谷歌开发者页面复制/粘贴代码片段。

3 个答案:

答案 0 :(得分:5)

您在布局xml中错误地定义了片段的路径。更正类属性。试试这个:

<?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" >
<fragment
        class="com.mwerner.fragments.ExamplesFragment"
        android:id="@+id/list"
        android:layout_weight="1"
        android:layout_width="0dp"
        android:layout_height="fill_parent"
         />

<fragment 
        class="com.mwerner.fragments.ExamplesFragment2"
        android:id="@+id/viewer"
        android:layout_weight="2"
        android:layout_width="0dp"
        android:layout_height="fill_parent" />


</LinearLayout>

答案 1 :(得分:0)

尝试扩展FragmentActivity

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

答案 2 :(得分:0)

当我在Fragments上编写我的第一个程序时,我犯了同样的错误。而不是在您的启动器活动中扩展“活动”扩展“FragmentActivity”。