5

我有一个 Android 应用程序,它基本上存储保存在用户手机上的 gpx 文件列表。当用户单击应用程序中的文件名时,它应该提示用户使用手机上可用的任何路由应用程序打开 gpx 文件。现在我正在测试在 Osmand 中打开文件。问题是,Osmand 正在打开,但随后立即崩溃。

尝试打开文件的代码是这样的:

File gpxFile = new File(Path);

Intent intent = new Intent();
intent.setAction(android.content.Intent.ACTION_VIEW);

Uri gpxUri = FileProvider.getUriForFile(view.getContext(), AUTHORITY, gpxFile);
intent.setDataAndType(gpxUri, "application/gpx+xml");

intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);

gpx 文件如下所示:

<?xml version="1.0"?>
<gpx creator="{CREATOR}" version="1.1" xmlns="http://www.topografix.com/GPX/1/1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/gpx.xsd">
<wpt lat="{LAT_1}" lon="{LON_1}">
    <name>{WPT_NAME_1}</name>
</wpt>
...
<wpt lat="{LAT_N}" lon="{LON_N}">
    <name>{WPT_NAME_N}</name>
</wpt>
<trk>
  <name>{TRACK_NAME}</name>
  <trkseg>
    <trkpt lat="{LAT_1}" lon="{LON_1}"></trkpt>
    ...
    <trkpt lat="{LAT_N}" lon="{LON_N}"></trkpt>
  </trkseg>
</trk>
</gpx>

起初我认为 gpx 文件的格式有问题,但如果我手动打开 Osmand 并尝试使用“配置地图”->“Gpx 轨道”导入文件,轨道在地图上显示得很好,包括航点。

LE:这是我在 Osmand 尝试启动时遇到的错误:

08-16 17:28:00.524 5681-5762/? E/net.osmand: RenderingRuleProperty Rendering parse  in strokeWidth_2
08-16 17:28:00.524 5681-5762/? E/net.osmand: RenderingRuleProperty Rendering parse  in strokeWidth_2
08-16 17:28:01.259 5681-5681/? E/AndroidRuntime: FATAL EXCEPTION: main
                                             Process: net.osmand, PID: 5681
                                             java.lang.RuntimeException: Unable to resume activity {net.osmand/net.osmand.plus.activities.MapActivity}: java.lang.SecurityException: Permission Denial: opening provider android.support.v4.content.FileProvider from ProcessRecord{3ddadf4 5681:net.osmand/u0a203} (pid=5681, uid=10203) that is not exported from uid 10275
                                                 at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3788)
                                                 at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3828)
                                                 at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2991)
                                                 at android.app.ActivityThread.-wrap14(ActivityThread.java)
                                                 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1635)
                                                 at android.os.Handler.dispatchMessage(Handler.java:102)
                                                 at android.os.Looper.loop(Looper.java:154)
                                                 at android.app.ActivityThread.main(ActivityThread.java:6692)
                                                 at java.lang.reflect.Method.invoke(Native Method)
                                                 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1468)
                                                 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1358)
                                              Caused by: java.lang.SecurityException: Permission Denial: opening provider android.support.v4.content.FileProvider from ProcessRecord{3ddadf4 5681:net.osmand/u0a203} (pid=5681, uid=10203) that is not exported from uid 10275
                                                 at android.os.Parcel.readException(Parcel.java:1693)
                                                 at android.os.Parcel.readException(Parcel.java:1646)
                                                 at android.app.ActivityManagerProxy.getContentProvider(ActivityManagerNative.java:4861)
                                                 at android.app.ActivityThread.acquireProvider(ActivityThread.java:5958)
                                                 at android.app.ContextImpl$ApplicationContentResolver.acquireUnstableProvider(ContextImpl.java:2452)
                                                 at android.content.ContentResolver.acquireUnstableProvider(ContentResolver.java:1521)
                                                 at android.content.ContentResolver.query(ContentResolver.java:520)
                                                 at android.content.ContentResolver.query(ContentResolver.java:478)
                                                 at net.osmand.plus.helpers.GpxImportHelper.getNameFromContentUri(GpxImportHelper.java:108)
                                                 at net.osmand.plus.helpers.GpxImportHelper.handleContentImport(GpxImportHelper.java:69)
                                                 at net.osmand.plus.activities.MapActivity.onResume(MapActivity.java:617)
                                                 at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1277)
                                                 at android.app.Activity.performResume(Activity.java:7058)
                                                 at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3765)
                                                 at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3828) 
                                                 at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2991) 
                                                 at android.app.ActivityThread.-wrap14(ActivityThread.java) 
                                                 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1635) 
                                                 at android.os.Handler.dispatchMessage(Handler.java:102) 
                                                 at android.os.Looper.loop(Looper.java:154) 
                                                 at android.app.ActivityThread.main(ActivityThread.java:6692) 
                                                 at java.lang.reflect.Method.invoke(Native Method) 
                                                 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1468) 
                                                 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1358) 
4

1 回答 1

1

Osmand 是否缺乏从 FileProvider 读取该文件的权限?换句话说,在调用 startActivity 之前授予意图中的读取权限是否有帮助:

intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);

(我不知道 Osmand 是否也需要写权限。您也可以尝试添加:FLAG_GRANT_WRITE_URI_PERMISSION)。

我还建议仔细检查 filepaths.xml 中 FileProvider 的配置(在“xml”资源目录中)。大概是这样的:

<paths>
    <files-path path="images/" name="myimages" />
</paths>

例如,您的文件路径属性是否指向正确的目录?该目录中是否有所需的 gpx 文件?(https://developer.android.com/training/secure-file-sharing/setup-sharing.html

要记住的另一件事是提供程序元素中的权限字符串在设备上必须是唯一的。因此,在您的 AndroidManifest 的这一部分中,请确保您已将“com.example.myapp.fileprovider”替换为您的应用独有的内容:

<provider
    android:name="android.support.v4.content.FileProvider"
    android:authorities="com.example.myapp.fileprovider"
    android:grantUriPermissions="true"
    android:exported="false">
    <meta-data
        android:name="android.support.FILE_PROVIDER_PATHS"
        android:resource="@xml/filepaths" />
</provider>

如果这没有帮助,我只能建议观察设备的 logcat 输出,看看 Osmand 是否为此崩溃编写了堆栈跟踪。

--- 编辑 08/17/2017 ---

只是在这个答案的正文中添加一些细节:正如 AM 在下面的评论中证明和描述的那样,实际的解决方法是通过在循环中重复调用 context.grantUriPermission 来显式地向设备上的多个特定包授予必要的权限,像这样的东西:

//grant permisions for all apps that can handle given intent
List<ResolveInfo> resInfoList = context.getPackageManager().queryIntentActivities(intent, PackageManager.MATCH_DEFAULT_ONLY);
for (ResolveInfo resolveInfo : resInfoList) {
    String packageName = resolveInfo.activityInfo.packageName;
    context.grantUriPermission(packageName, uri, Intent.FLAG_GRANT_READ_URI_PERMISSION);
}

这种方法在此处有更多记录:https ://stackoverflow.com/a/18332000/3482621

调用grantUriPermission 的需要(而不仅仅是依赖于intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION))似乎取决于设备上安装的Android 平台版本。这在此处的问题报告中进行了描述:https ://issuetracker.google.com/issues/37005552

于 2017-08-11T16:30:30.090 回答