无法转换为android.support.v4.app.Fragment

时间：2014-01-03 23:41:44

标签： android android-fragments 

01-03 18:39:41.423  10451-10451/com.beerportfolio.beerportfoliopro E/AndroidRuntime﹕ FATAL EXCEPTION: main
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.beerportfolio.beerportfoliopro/com.beerportfolio.beerportfoliopro.MainDraw}: java.lang.ClassCastException: com.beerportfolio.beerportfoliopro.StatisticsPage cannot be cast to android.support.v4.app.Fragment
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2517)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2574)
            at android.app.ActivityThread.access$600(ActivityThread.java:162)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1413)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:158)
            at android.app.ActivityThread.main(ActivityThread.java:5789)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:525)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1027)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:843)
            at dalvik.system.NativeStart.main(Native Method)
     Caused by: java.lang.ClassCastException: com.beerportfolio.beerportfoliopro.StatisticsPage cannot be cast to android.support.v4.app.Fragment
            at android.support.v4.app.Fragment.instantiate(Fragment.java:402)
            at android.support.v4.app.Fragment.instantiate(Fragment.java:377)
            at com.beerportfolio.beerportfoliopro.MainDraw.onCreate(MainDraw.java:51)
            at android.app.Activity.performCreate(Activity.java:5195)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1111)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2473)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2574)
            at android.app.ActivityThread.access$600(ActivityThread.java:162)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1413)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:158)
            at android.app.ActivityThread.main(ActivityThread.java:5789)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:525)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1027)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:843)
            at dalvik.system.NativeStart.main(Native Method)
01-03 18:39:43.646    1045-5127/com.htc.launcher E/Prism.WidgetManager﹕ Widget ComponentInfo{com.levelup.beautifulwidgets/com.levelup.beautifulwidgets.ClockWidget52} can not fit on this device (960, 330 => 5x2), spanXY: 5, 2, minSpanXY: 5, 2
01-03 18:39:43.696    1045-5127/com.htc.launcher E/Prism.WidgetManager﹕ The same lists. No need to update. skip it.
01-03 18:39:43.826  10559-10559/eu.chainfire.supersu E/SuperSU﹕ isLaunchedBySettings: No
01-03 18:39:44.857  10593-10670/com.yahoo.mobile.client.android.flickr:feather_system_receiver E/a.a.ar﹕ Batch has been disabled: app_loads
01-03 18:39:44.957  10611-10687/com.yahoo.mobile.client.android.flickr E/a.a.ar﹕ Batch has been disabled: app_loads
01-03 18:39:46.138  10786-10793/? E/jdwp﹕ Failed writing handshake bytes: Broken pipe (-1 of 14)

不确定要改变什么到这里。我的统计页面代码是：

import android.app.ActionBar;
import android.content.SharedPreferences;
import android.preference.PreferenceManager;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.widget.DrawerLayout;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;

/**
 * Created by Mike on 1/3/14.
 */
public class StatisticsPage extends FragmentActivity {

    ActionBar.Tab tab;


    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.statistics_pagelayout);

        ActionBar actionBar = getActionBar();
        // Create Actionbar Tabs

        //launch rate dialog
        //AppRater.app_launched(this);



        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
        String userName = prefs.getString("userName", null);
        String userID = prefs.getString("userID", null);
        String url = "http://www.beerportfolio.com/app_getStatistics.php?";
        String userURLComp = "u=" + userID;


        url = url + userURLComp ;

        Log.d("basicStats", url);


        new getBasicStats(this).execute(url);



    }



}

统计页面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:id="@+id/statisticsTitle"
        android:gravity="center"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:text="Your Statistics"
        android:textSize="20sp"
        android:textStyle = "bold"
        android:padding="5dip"
        >
    </TextView>

    <View
        android:layout_width="1dp"
        android:layout_height="30dp">
    </View>

    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >


        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Brewery"
            android:textStyle="bold"
            android:onClick="openBreweryStatistics"
            android:layout_weight="1"
            android:id="@+id/button"
            android:textColor="@color/orange"
            style="?android:attr/borderlessButtonStyle"
            android:layout_gravity="center_horizontal|top"
            />

        <View
            android:id="@+id/ViewColorPickerHelper"
            android:layout_width="1dip"
            android:layout_height="match_parent"
            android:layout_alignParentTop="true"
            android:layout_alignParentBottom="true"
            android:layout_marginBottom="4dip"
            android:layout_marginTop="4dip"
            android:background="?android:attr/dividerVertical"
            android:layout_centerHorizontal="true"/>

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textStyle="bold"
            android:text="Style"
            android:onClick="openStyleStatistics"
            android:layout_weight="1"
            android:id="@+id/button2"
            android:textColor="@color/orange"
            style="?android:attr/borderlessButtonStyle"
            android:layout_gravity="center_horizontal|top"/>

        <View
            android:id="@+id/ViewColorPickerHelper"
            android:layout_width="1dip"
            android:layout_height="match_parent"
            android:layout_alignParentTop="true"
            android:layout_alignParentBottom="true"
            android:layout_marginBottom="4dip"
            android:layout_marginTop="4dip"
            android:background="?android:attr/dividerVertical"
            android:layout_centerHorizontal="true"/>

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textStyle="bold"
            android:text="Taste"
            android:onClick="openTasteStatistics"
            android:layout_weight="1"
            android:id="@+id/button3"
            android:textColor="@color/orange"
            style="?android:attr/borderlessButtonStyle"
            android:layout_gravity="center_horizontal|top"/>
    </LinearLayout>

    <View
        android:layout_width="1dp"
        android:layout_height="20dp">
    </View>


    <ListView
        android:id="@+id/yourStats"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:dividerHeight="0px"
        android:divider="@null"

        >
    </ListView>



</LinearLayout>

MainDraw是我的类，它为Android导航抽屉启动xml：

package com.beerportfolio.beerportfoliopro;

import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.widget.DrawerLayout;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;

/**
 * Created by Mike on 1/3/14.
 */
public class MainDraw extends FragmentActivity {
    final String[] data ={"Statistics","two","three"};
    final String[] fragments ={
            "com.beerportfolio.beerportfoliopro.StatisticsPage",
            "com.beerportfolio.beerportfoliopro.FragmentTwo",
            "com.beerportfolio.beerportfoliopro.FragmentThree"};
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fragment_main);

        //todo: load statistics fragment

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActionBar().getThemedContext(), android.R.layout.simple_list_item_1, data);

        final DrawerLayout drawer = (DrawerLayout)findViewById(R.id.drawer_layout);
        final ListView navList = (ListView) findViewById(R.id.drawer);
        navList.setAdapter(adapter);
        navList.setOnItemClickListener(new AdapterView.OnItemClickListener(){

            @Override
            public void onItemClick(AdapterView<?> parent, View view, final int pos,long id){
                drawer.setDrawerListener( new DrawerLayout.SimpleDrawerListener(){
                    @Override
                    public void onDrawerClosed(View drawerView){
                        super.onDrawerClosed(drawerView);
                        FragmentTransaction tx = getSupportFragmentManager().beginTransaction();
                        tx.replace(R.id.main, Fragment.instantiate(MainDraw.this, fragments[pos]));
                        tx.commit();
                    }
                });
                drawer.closeDrawer(navList);
            }
        });
        FragmentTransaction tx = getSupportFragmentManager().beginTransaction();
        tx.replace(R.id.main,Fragment.instantiate(MainDraw.this, fragments[0]));
        tx.commit();
    }

}

1 个答案:

答案 0 :(得分：0)

您的StatisticPage类是Activity而非Fragment，因此您无法将其与SupportFragmentManager一起使用。这就是你有ClassCastException的原因。

了解如何在http://developer.android.com/guide/components/fragments.html

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