我正在尝试通过FileProvider
API共享文件。在服务器端,文件已配置如下:
public void prepareData() {
File apkFile = new File(context.getCacheDir(), "ngp-187002.apk");
Uri apkFileUri = FileProvider.getUriForFile(context, context.getPackageName() + ".fileprovider", apkFile);
Log.i(TAG, "Apk file Uri: " + apkFileUri.toString() + ", fileSize = " + apkFile.length());
context.grantUriPermission(NGP_UPDATER_PACKAGE_NAME, apkFileUri, Intent.FLAG_GRANT_READ_URI_PERMISSION);
Intent updaterIntent = new Intent();
updaterIntent.setClassName(NGP_UPDATER_PACKAGE_NAME, NGP_UPDATER_SERVICE_CLASS_NAME);
updaterIntent.setAction(EXTERNAL_ACTION_UPDATE_NGP);
// updaterIntent.putExtra(EXTERNAL_PARAM_APK_LOC, TARGET_APK_DIR);
updaterIntent.setDataAndType(apkFileUri, "application/vnd.android.package-archive");
updaterIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
// Since NgpApp & NgpUpdater are signed by the same key, we can start the process
context.startService(updaterIntent);
}
[AndroidManifest.xml
已配置如下:
<provider
android:authorities="${applicationId}.fileprovider"
android:exported="false"
android:grantUriPermissions="true"
android:name="android.support.v4.content.FileProvider">
<meta-data android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/fileproviderpath"/>
</provider>
Filepath xml文件如下
<paths xmlns:android="http://schemas.android.com/apk/res/android">
<cache-path name="cache" path="."/>
</paths>
接收方是一个IntentService,我正在尝试获取如下所示的流:
String apkLocUri = intent.getData();
is = getBaseContext().getContentResolver().openInputStream(apkLocUri);
但是我得到
java.io.FileNotFoundException: Failed opening content provider: content://com.canaldigital.ngp.fileprovider/cache/ngp-187002.apk
at android.content.ContentResolver.openTypedAssetFileDescriptor(ContentResolver.java:1187)
at android.content.ContentResolver.openAssetFileDescriptor(ContentResolver.java:984)
at android.content.ContentResolver.openInputStream(ContentResolver.java:704)
at com.canaldigital.ngpupdater.PackageInstallerService.installPackage(PackageInstallerService.java:60)
at com.canaldigital.ngpupdater.PackageInstallerService.onHandleIntent(PackageInstallerService.java:52)
at android.app.IntentService$ServiceHandler.handleMessage(IntentService.java:68)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.os.HandlerThread.run(HandlerThread.java:61)
上次与内容提供商合作时,我以这种方式创建了权限:通过在AndroidManifest,xml
文件中添加以下代码来创建读写权限:
<uses-permission android:name="com.anystring.READ_PERMISSION"/>
<uses-permission android:name="com.anystring.WRITE_PERMISSION"/>
<permission android:name="com.anystring.READ_PERMISSION"
android:protectionLevel="signature" />
<permission android:name="com.anystring.WRITE_PERMISSION"
android:protectionLevel="signature" />
<application
// ... rest of the code ...
/>
在提供者中,接下来,您需要在提供者代码中授予这些权限,所以看起来像这样:
<provider
android:authorities="${applicationId}.fileprovider"
android:readPermission="com.anystring.READ_PERMISSION"
android:writePermission="com.anystring.WRITE_PERMISSION"
android:enabled="true"
android:exported="true"
android:multiprocess="true"
android:grantUriPermissions="true"
android:name="android.support.v4.content.FileProvider">
<meta-data android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/fileproviderpath"/>
</provider>
基本上,这样,您就可以创建权限。只有清单文件中被授予权限的应用程序才能访问数据。签名级别保护可确保只有您公司的应用程序可以读取彼此的数据。因此,根据您的需要进行更改/删除。我希望这能奏效,祝您好运。