使用应用程序时,碎片撞毁 [英] App crashing when using fragments
问题描述
林与碎片和工作。
香港专业教育学院得到了我code的一个问题,我只是不能找到。
在这片code,在我的片段之一的logcat的要点:
@覆盖
公共查看onCreateView(LayoutInflater充气器,容器的ViewGroup,
捆绑savedInstanceState){
返回inflater.inflate(R.layout.activity_main,集装箱,FALSE);
}
我的主类(FragmentActivity):
进口android.app.Activity;
进口android.os.Bundle;
进口android.support.v4.app.Fragment;
进口android.support.v4.app.FragmentActivity;
进口android.support.v4.app.FragmentTransaction;
进口android.view.View;公共类片段扩展FragmentActivity { @覆盖
保护无效的onCreate(捆绑savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.activity_fragments); MainActivity片段=新MainActivity();
FragmentTransaction交易= getSupportFragmentManager()
.beginTransaction();
transaction.add(R.id.fragment_place,片段);
器transaction.commit();
} 公共无效onSelectFragment(查看视图){ 片段newFragment; 如果(查看== findViewById(R.id.add)){
newFragment =新的Add();
}否则如果(查看== findViewById(R.id.map)){
newFragment =新MainActivity();
}其他{
newFragment =新MainActivity();
} FragmentTransaction交易= getSupportFragmentManager()
.beginTransaction();
transaction.replace(R.id.fragment_place,newFragment);
transaction.addToBackStack(NULL);
器transaction.commit();
}}
和logcat的:
09-30 00:02:52.363:E / AndroidRuntime(32284):致命异常:主要
09-30 00:02:52.363:E / AndroidRuntime(32284):了java.lang.RuntimeException:无法启动活动ComponentInfo {com.example.free / com.example.free.Fragments}:android.view.InflateException:二进制XML文件行#8:错误充气类片段
09-30 00:02:52.363:E / AndroidRuntime(32284):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2185)
09-30 00:02:52.363:E / AndroidRuntime(32284):在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2210)
09-30 00:02:52.363:E / AndroidRuntime(32284):在android.app.ActivityThread.access $ 600(ActivityThread.java:142)
09-30 00:02:52.363:E / AndroidRuntime(32284):在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1208)
09-30 00:02:52.363:E / AndroidRuntime(32284):在android.os.Handler.dispatchMessage(Handler.java:99)
09-30 00:02:52.363:E / AndroidRuntime(32284):在android.os.Looper.loop(Looper.java:137)
09-30 00:02:52.363:E / AndroidRuntime(32284):在android.app.ActivityThread.main(ActivityThread.java:4931)
09-30 00:02:52.363:E / AndroidRuntime(32284):在java.lang.reflect.Method.invokeNative(本机方法)
09-30 00:02:52.363:E / AndroidRuntime(32284):在java.lang.reflect.Method.invoke(Method.java:511)
09-30 00:02:52.363:E / AndroidRuntime(32284):在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:791)
09-30 00:02:52.363:E / AndroidRuntime(32284):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:558)
09-30 00:02:52.363:E / AndroidRuntime(32284):在dalvik.system.NativeStart.main(本机方法)
09-30 00:02:52.363:E / AndroidRuntime(32284):android.view.InflateException:二进制XML文件行#8:错误充气类片段产生的原因
09-30 00:02:52.363:E / AndroidRuntime(32284):在android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
09-30 00:02:52.363:E / AndroidRuntime(32284):在android.view.LayoutInflater.rInflate(LayoutInflater.java:746)
09-30 00:02:52.363:E / AndroidRuntime(32284):在android.view.LayoutInflater.inflate(LayoutInflater.java:489)
09-30 00:02:52.363:E / AndroidRuntime(32284):在android.view.LayoutInflater.inflate(LayoutInflater.java:396)
09-30 00:02:52.363:E / AndroidRuntime(32284):在com.example.free.MainActivity.onCreateView(MainActivity.java:124)
09-30 00:02:52.363:E / AndroidRuntime(32284):在android.support.v4.app.Fragment.performCreateView(Fragment.java:1478)
09-30 00:02:52.363:E / AndroidRuntime(32284):在android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:927)
09-30 00:02:52.363:E / AndroidRuntime(32284):在android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
09-30 00:02:52.363:E / AndroidRuntime(32284):在android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
09-30 00:02:52.363:E / AndroidRuntime(32284):在android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1460)
09-30 00:02:52.363:E / AndroidRuntime(32284):在android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:556)
09-30 00:02:52.363:E / AndroidRuntime(32284):在android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1163)
09-30 00:02:52.363:E / AndroidRuntime(32284):在android.app.Activity.performStart(Activity.java:5018)
09-30 00:02:52.363:E / AndroidRuntime(32284):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2148)
09-30 00:02:52.363:E / AndroidRuntime(32284):... 11个
09-30 00:02:52.363:E / AndroidRuntime(32284):java.lang.ClassCastException:致com.google.android.gms.maps.MapFragment不能转换为android.support.v4.app.Fragment
09-30 00:02:52.363:E / AndroidRuntime(32284):在android.support.v4.app.Fragment.instantiate(Fragment.java:402)
09-30 00:02:52.363:E / AndroidRuntime(32284):在android.support.v4.app.Fragment.instantiate(Fragment.java:377)
09-30 00:02:52.363:E / AndroidRuntime(32284):在android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:277)
09-30 00:02:52.363:E / AndroidRuntime(32284):在android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:676)
09-30 00:02:52.363:E / AndroidRuntime(32284):24 ...更多
类MainActivity是很长,所以我粘贴它使用pasebin:
感谢您的帮助!
编辑:
私人GoogleMap的地图;FragmentTransaction交易= getChildFragmentManager()调用BeginTransaction()。
transaction.add(R.id.map,地图).commit();
它显示了一个错误:
在类型FragmentTransaction Add方法(INT,片段)是不是
适用于参数(INT,GoogleMap的)
块引用>解决方案产生的原因:java.lang.ClassCastException:com.google.android.gms.maps.MapFragment不能转换为android.support.v4.app.Fragment
您不能创建使用XML片段内的片段。您还没有张贴片段的XML,但我猜你有地图碎片在那里。您仍然可以添加,但你需要动态地添加使用
getChildFragmentManager()
Im working with fragments and..
Ive got a problem in my code that I just cant find.
The logcat points at this piece of code, in one of my fragments:
@Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { return inflater.inflate(R.layout.activity_main, container, false); }
My main class (the FragmentActivity):
import android.app.Activity; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentActivity; import android.support.v4.app.FragmentTransaction; import android.view.View; public class Fragments extends FragmentActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_fragments); MainActivity fragment = new MainActivity(); FragmentTransaction transaction = getSupportFragmentManager() .beginTransaction(); transaction.add(R.id.fragment_place, fragment); transaction.commit(); } public void onSelectFragment(View view) { Fragment newFragment; if (view == findViewById(R.id.add)) { newFragment = new Add(); } else if (view == findViewById(R.id.map)) { newFragment = new MainActivity(); } else { newFragment = new MainActivity(); } FragmentTransaction transaction = getSupportFragmentManager() .beginTransaction(); transaction.replace(R.id.fragment_place, newFragment); transaction.addToBackStack(null); transaction.commit(); } }
and the logcat:
09-30 00:02:52.363: E/AndroidRuntime(32284): FATAL EXCEPTION: main 09-30 00:02:52.363: E/AndroidRuntime(32284): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.free/com.example.free.Fragments}: android.view.InflateException: Binary XML file line #8: Error inflating class fragment 09-30 00:02:52.363: E/AndroidRuntime(32284): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2185) 09-30 00:02:52.363: E/AndroidRuntime(32284): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2210) 09-30 00:02:52.363: E/AndroidRuntime(32284): at android.app.ActivityThread.access$600(ActivityThread.java:142) 09-30 00:02:52.363: E/AndroidRuntime(32284): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1208) 09-30 00:02:52.363: E/AndroidRuntime(32284): at android.os.Handler.dispatchMessage(Handler.java:99) 09-30 00:02:52.363: E/AndroidRuntime(32284): at android.os.Looper.loop(Looper.java:137) 09-30 00:02:52.363: E/AndroidRuntime(32284): at android.app.ActivityThread.main(ActivityThread.java:4931) 09-30 00:02:52.363: E/AndroidRuntime(32284): at java.lang.reflect.Method.invokeNative(Native Method) 09-30 00:02:52.363: E/AndroidRuntime(32284): at java.lang.reflect.Method.invoke(Method.java:511) 09-30 00:02:52.363: E/AndroidRuntime(32284): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791) 09-30 00:02:52.363: E/AndroidRuntime(32284): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:558) 09-30 00:02:52.363: E/AndroidRuntime(32284): at dalvik.system.NativeStart.main(Native Method) 09-30 00:02:52.363: E/AndroidRuntime(32284): Caused by: android.view.InflateException: Binary XML file line #8: Error inflating class fragment 09-30 00:02:52.363: E/AndroidRuntime(32284): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704) 09-30 00:02:52.363: E/AndroidRuntime(32284): at android.view.LayoutInflater.rInflate(LayoutInflater.java:746) 09-30 00:02:52.363: E/AndroidRuntime(32284): at android.view.LayoutInflater.inflate(LayoutInflater.java:489) 09-30 00:02:52.363: E/AndroidRuntime(32284): at android.view.LayoutInflater.inflate(LayoutInflater.java:396) 09-30 00:02:52.363: E/AndroidRuntime(32284): at com.example.free.MainActivity.onCreateView(MainActivity.java:124) 09-30 00:02:52.363: E/AndroidRuntime(32284): at android.support.v4.app.Fragment.performCreateView(Fragment.java:1478) 09-30 00:02:52.363: E/AndroidRuntime(32284): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:927) 09-30 00:02:52.363: E/AndroidRuntime(32284): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104) 09-30 00:02:52.363: E/AndroidRuntime(32284): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682) 09-30 00:02:52.363: E/AndroidRuntime(32284): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1460) 09-30 00:02:52.363: E/AndroidRuntime(32284): at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:556) 09-30 00:02:52.363: E/AndroidRuntime(32284): at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1163) 09-30 00:02:52.363: E/AndroidRuntime(32284): at android.app.Activity.performStart(Activity.java:5018) 09-30 00:02:52.363: E/AndroidRuntime(32284): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2148) 09-30 00:02:52.363: E/AndroidRuntime(32284): ... 11 more 09-30 00:02:52.363: E/AndroidRuntime(32284): Caused by: java.lang.ClassCastException: com.google.android.gms.maps.MapFragment cannot be cast to android.support.v4.app.Fragment 09-30 00:02:52.363: E/AndroidRuntime(32284): at android.support.v4.app.Fragment.instantiate(Fragment.java:402) 09-30 00:02:52.363: E/AndroidRuntime(32284): at android.support.v4.app.Fragment.instantiate(Fragment.java:377) 09-30 00:02:52.363: E/AndroidRuntime(32284): at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:277) 09-30 00:02:52.363: E/AndroidRuntime(32284): at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:676) 09-30 00:02:52.363: E/AndroidRuntime(32284): ... 24 more
The class "MainActivity" is very long so I pasted it using pasebin:
Thanks for your assistance!
Edit:
private GoogleMap map; FragmentTransaction transaction = getChildFragmentManager().beginTransaction(); transaction.add(R.id.map, map).commit();
it shows an error:
The method add(int, Fragment) in the type FragmentTransaction is not applicable for the arguments (int, GoogleMap)
解决方案Caused by: java.lang.ClassCastException: com.google.android.gms.maps.MapFragment cannot be cast to android.support.v4.app.Fragment
You can't create a fragment inside a fragment using xml. You haven't posted the xml for the fragment, but I'm guessing you have a map fragment in there. You can still add it, but you need to add it dynamically using
getChildFragmentManager()
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