[英]Android -replace running fragment
我在我的應用程序中實現了一個導航抽屜,導航抽屜使用片段來推薦,並且當用戶從導航抽屜中選擇某些內容時,只需更改正在運行的片段即可。 每當我嘗試用新片段替換當前片段時,我的應用程序就會崩潰。 這是我用來替換片段的代碼。
Body newFragment = new Body();
android.support.v4.app.FragmentManager fragmentManager = getSupportFragmentManager();
android.support.v4.app.FragmentTransaction transaction = fragmentManager
.beginTransaction();
// Replace whatever is in the fragment_container view with this
// fragment,
// and add the transaction to the back stack
transaction.replace(R.id.llhome, newFragment);
transaction.addToBackStack(null);
// Commit the transaction
transaction.commit();
編輯:下面是我的logcat
06-18 13:53:10.142: E/AndroidRuntime(17700): FATAL EXCEPTION: main
06-18 13:53:10.142: E/AndroidRuntime(17700): java.lang.NullPointerException
06-18 13:53:10.142: E/AndroidRuntime(17700): at com.OptimusApps.stayhealthy.Body.<init>(Body.java:31)
06-18 13:53:10.142: E/AndroidRuntime(17700): at com.OptimusApps.stayhealthy.MainActivity$DrawerItemClickListener.onItemClick(MainActivity.java:129)
06-18 13:53:10.142: E/AndroidRuntime(17700): at android.widget.AdapterView.performItemClick(AdapterView.java:292)
06-18 13:53:10.142: E/AndroidRuntime(17700): at android.widget.AbsListView.performItemClick(AbsListView.java:1060)
06-18 13:53:10.142: E/AndroidRuntime(17700): at android.widget.AbsListView$PerformClick.run(AbsListView.java:2516)
06-18 13:53:10.142: E/AndroidRuntime(17700): at android.widget.AbsListView$1.run(AbsListView.java:3170)
06-18 13:53:10.142: E/AndroidRuntime(17700): at android.os.Handler.handleCallback(Handler.java:605)
06-18 13:53:10.142: E/AndroidRuntime(17700): at android.os.Handler.dispatchMessage(Handler.java:92)
06-18 13:53:10.142: E/AndroidRuntime(17700): at android.os.Looper.loop(Looper.java:137)
06-18 13:53:10.142: E/AndroidRuntime(17700): at android.app.ActivityThread.main(ActivityThread.java:4575)
06-18 13:53:10.142: E/AndroidRuntime(17700): at java.lang.reflect.Method.invokeNative(Native Method)
06-18 13:53:10.142: E/AndroidRuntime(17700): at java.lang.reflect.Method.invoke(Method.java:511)
06-18 13:53:10.142: E/AndroidRuntime(17700): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
06-18 13:53:10.142: E/AndroidRuntime(17700): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:556)
06-18 13:53:10.142: E/AndroidRuntime(17700): at dalvik.system.NativeStart.main(Native Method)
我認為您這一行有一個NPE android.support.v4.app.FragmentTransaction transaction = fragmentManager .beginTransaction();
替換您的android.support.v4.app.FragmentManager fragmentManager = getSupportFragmentManager();
通過以下之一:
android.support.v4.app.FragmentManager fragmentManager = getFragmentManager();
讓我知道你的進步;)
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