意向显示空白图像 [英] Intent shows a blank image

问题描述

当我尝试使用intent打开图库(我正在开发文件管理器)上的图像时，显示的图像完全是黑色的.但是我不明白为什么，因为我也遵循了最后的最佳做法谷歌关于获取Uri(与FileProvider一起使用)的实践.

When i try to open an image on the gallery (I'm developing a file manager) using intent, the image shown is totally black., but I can't understand why, as I've also followed the last best practices by google about getting the Uri (with FileProvider).

MainActivity.java

MainActivity.java

Intent intent=new Intent();
                    intent.setAction(Intent.ACTION_VIEW);
                    Uri uri=FileProvider.getUriForFile(MainActivity.this,BuildConfig.APPLICATION_ID + ".provider",image);
                    intent.setDataAndType(uri,MimeTypeMap.getSingleton().getMimeTypeFromExtension(fileName));
                    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                    startActivity(intent);

AndroidManifest.xml

AndroidManifest.xml

<provider
        android:name="android.support.v4.content.FileProvider"
        android:authorities="${applicationId}.provider"
        android:exported="false"
        android:grantUriPermissions="true">
        <meta-data
            android:name="android.support.FILE_PROVIDER_PATHS"
            android:resource="@xml/provider_paths"/>
    </provider>
</application>

provider_paths.xml

provider_paths.xml

<?xml version="1.0" encoding="utf-8"?>
   <paths xmlns:android="http://schemas.android.com/apk/res/android">
      <external-path name="external_files" path="."/>

</paths>

推荐答案

更改:

intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

收件人:

intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK|Intent.FLAG_GRANT_READ_URI_PERMISSION);

目前，其他应用无权查看Uri标识的图像.

as right now, the other app has no rights to view the image identified by the Uri.

这篇关于意向显示空白图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！