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从DialogFragment调用FileProvider时出错-引用的空对象,

android-fileprovider dialog android java

Grzegorz BrzÄczyszczykiewicz · 技术社区 · 7 年前

从创建新用户的片段中,我调用了另一个片段对话框(单击ImageButton),它使我能够从相机或图库中选择照片。画廊可以很好地工作,但相机不能。在这一行中:

 Uri photoUri = FileProvider.getUriForFile(globalContext, getActivity().getPackageName() + ".provider", getCameraFile());

我收到以下错误:

java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.XmlResourceParser android.content.pm.ProviderInfo.loadXmlMetaData(android.content.pm.PackageManager, java.lang.String)' on a null object reference

cna的问题在哪里?

当做格热戈日

编辑:

FATAL EXCEPTION: main
                                                                             Process: com.myapp.myapp, PID: 27523
                                                                             java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.XmlResourceParser android.content.pm.ProviderInfo.loadXmlMetaData(android.content.pm.PackageManager, java.lang.String)' on a null object reference
                                                                                 at android.support.v4.content.FileProvider.parsePathStrategy(FileProvider.java:583)
                                                                                 at android.support.v4.content.FileProvider.getPathStrategy(FileProvider.java:557)
                                                                                 at android.support.v4.content.FileProvider.getUriForFile(FileProvider.java:399)
                                                                                 at com.myapp.myapp.utils.PictureDialog.onTakePhoto(PictureDialog.java:80)
                                                                                 at com.myapp.myapp.utils.PictureDialog_ViewBinding$1.doClick(PictureDialog_ViewBinding.java:32)
                                                                                 at butterknife.internal.DebouncingOnClickListener.onClick(DebouncingOnClickListener.java:22)
                                                                                 at android.view.View.performClick(View.java:5184)
                                                                                 at android.view.View$PerformClick.run(View.java:20893)
                                                                                 at android.os.Handler.handleCallback(Handler.java:739)
                                                                                 at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                                 at android.os.Looper.loop(Looper.java:145)
                                                                                 at android.app.ActivityThread.main(ActivityThread.java:5940)
                                                                                 at java.lang.reflect.Method.invoke(Native Method)
                                                                                 at java.lang.reflect.Method.invoke(Method.java:372)
                                                                                 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1389)
                                                                                 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1184)

1 回复 | 直到 7 年前

CommonsWare 7 年前

FileProvider 找不到 <provider> android:authorities 值等于 getActivity().getPackageName() + ".provider" . 具体来说,此代码导致 null info :

final ProviderInfo info = context.getPackageManager()
            .resolveContentProvider(authority, PackageManager.GET_META_DATA);

context 是第一个参数 getUriForFile() 和 authority getUriForFile() )

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