Android(安卓)7.0，8.0拍照loadXmlMetaData(XXXX, java.lang.String)' on a null object reference

 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:604)        at android.support.v4.content.FileProvider.getPathStrategy(FileProvider.java:578)        at android.support.v4.content.FileProvider.getUriForFile(FileProvider.java:416)        at com.xiaoluobei.facedetection.view.activity.FaceBlackInsertOrUpdateActivity$3.onClick(FaceBlackInsertOrUpdateActivity.java:262)        at android.support.v7.app.AlertController$AlertParams$3.onItemClick(AlertController.java:1067)        at android.widget.AdapterView.performItemClick(AdapterView.java:313)        at android.widget.AbsListView.performItemClick(AbsListView.jav

这个错多半是出在provider的包名部分写错了导致没找到报空了，从第4行的日志定位到FaceBlackInsertOrUpdateActivity.java类262行，代码是：

  phototUri = FileProvider.getUriForFile(                                    context,                                    context.getPackageName() + ".fileprovider",                                    cameraPhoto);

打断点一看，context.getPackageName()得到的跟manifest得到的包名并不一致，费解，故代码改为：

phototUri = FileProvider.getUriForFile(                                    context,                                    "com.xiaoluobei.facedetection.fileproviders",                                    cameraPhoto);

好用了。

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