无法转换为android.support.v4.app.Fragment(cannot be cast to android.support.v4.app.Fragment)

无法转换为android.support.v4.app.Fragment(cannot be cast to android.support.v4.app.Fragment) 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)

不知道该改变什么到这里。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(); } } 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)

Not sure what to change to what here. My statistics page code is:

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); } }

Statistics page 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 is my class that launches the xml for the Android Navigation Drawer:

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(); } }