android - 从11 API到更低版本的端口 fragment 无效

我在Vogel网站上找到了AndroidFragment教程，并在Android 4.0上做到了。然后，我尝试将其移植到较低版本，例如API 8。

每当我启动我的应用程序时，我都会遇到ClassNotFound异常

请帮助我修复错误。

有我的MainActivity文件：

package com.dev.fragments;

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


public class MainActivity extends FragmentActivity {

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

}

有我的main.xml文件：

<?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="horizontal" >

    <fragment
        android:id="@+id/listFragment"
        android:layout_width="150dip"
        android:layout_height="match_parent"
        android:layout_marginTop="?android:attr/actionBarSize"
        class="com.dev.fragments.ListFragment" ></fragment>

    <fragment
        android:id="@+id/detailFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        class="com.dev.fragments.DetailFragment" >
        <!-- Preview: layout=@layout/details -->
    </fragment>

</LinearLayout>

有我的ListFragment文件：

package com.dev.fragments;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class ListFragment extends android.support.v4.app.ListFragment {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        String[] values = new String[] { "Android", "iPhone", "WindowsMobile",
                "Blackberry", "WebOS", "Ubuntu", "Windows7", "Max OS X",
                "Linux", "OS/2" };
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(),
                android.R.layout.simple_list_item_1, values);
        setListAdapter(adapter);
    }

    @Override
    public void onListItemClick(ListView l, View v, int position, long id) {
        String item = (String) getListAdapter().getItem(position);
        DetailFragment fragment = (DetailFragment) getFragmentManager()
                .findFragmentById(R.id.detailFragment);
        if (fragment != null && fragment.isInLayout()) {
            fragment.setText(item);
        } else {
            Intent intent = new Intent(getActivity().getApplicationContext(),
                    DetailActivity.class);
            intent.putExtra("value", item);
            startActivity(intent);

        }

    }
}

有我的DetailFragment文件：

package com.dev.fragments;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;


public class DetailFragment extends Fragment {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Log.e("Test", "hello");
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

    }

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

    public void setText(String item) {
        TextView view = (TextView) getView().findViewById(R.id.detailsText);
        view.setText(item);
    }

}

有我的清单文件：

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.dev.fragments"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="4"
        android:targetSdkVersion="15" />

    <application
        android:label="@string/app_name">
        <activity
            android:name=".MainActivity"
            android:label="@string/title_activity_main" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".DetailActivity"></activity>
    </application>

</manifest>

还有我的错误：

08-08 08:55:02.126: E/AndroidRuntime(454): FATAL EXCEPTION: main
08-08 08:55:02.126: E/AndroidRuntime(454): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.dev.fragments/com.dev.fragments.MainActivity}: java.lang.ClassNotFoundException: com.dev.fragments.MainActivity in loader dalvik.system.PathClassLoader[/data/app/com.dev.fragments-2.apk]
08-08 08:55:02.126: E/AndroidRuntime(454):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2585)
08-08 08:55:02.126: E/AndroidRuntime(454):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
08-08 08:55:02.126: E/AndroidRuntime(454):  at android.app.ActivityThread.access$2300(ActivityThread.java:125)
08-08 08:55:02.126: E/AndroidRuntime(454):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
08-08 08:55:02.126: E/AndroidRuntime(454):  at android.os.Handler.dispatchMessage(Handler.java:99)
08-08 08:55:02.126: E/AndroidRuntime(454):  at android.os.Looper.loop(Looper.java:123)
08-08 08:55:02.126: E/AndroidRuntime(454):  at android.app.ActivityThread.main(ActivityThread.java:4627)
08-08 08:55:02.126: E/AndroidRuntime(454):  at java.lang.reflect.Method.invokeNative(Native Method)
08-08 08:55:02.126: E/AndroidRuntime(454):  at java.lang.reflect.Method.invoke(Method.java:521)
08-08 08:55:02.126: E/AndroidRuntime(454):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
08-08 08:55:02.126: E/AndroidRuntime(454):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
08-08 08:55:02.126: E/AndroidRuntime(454):  at dalvik.system.NativeStart.main(Native Method)
08-08 08:55:02.126: E/AndroidRuntime(454): Caused by: java.lang.ClassNotFoundException: com.dev.fragments.MainActivity in loader dalvik.system.PathClassLoader[/data/app/com.dev.fragments-2.apk]
08-08 08:55:02.126: E/AndroidRuntime(454):  at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:243)
08-08 08:55:02.126: E/AndroidRuntime(454):  at java.lang.ClassLoader.loadClass(ClassLoader.java:573)
08-08 08:55:02.126: E/AndroidRuntime(454):  at java.lang.ClassLoader.loadClass(ClassLoader.java:532)
08-08 08:55:02.126: E/AndroidRuntime(454):  at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
08-08 08:55:02.126: E/AndroidRuntime(454):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2577)

最佳答案

我猜这是一个logcat错误？

我没有受过v4支持软件包移植的培训，但似乎您的MainActivity没有正确部署，尽管没有正确放入com.dev.fragments-2.apk中。

关于android - 从11 API到更低版本的端口 fragment 无效，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/11861048/