Question

注意：类似的问题通过下面的SO链接询问，但没有建议的解决方案适合我，因此开始这个线程。

MediaStore.Images.Media.insertImage is returning null when trying to save the image
Why Images.Media.insertImage return null

问题陈述： 我正在从网址下载图像，然后尝试共享相同的图像。为了达到这个目的，我需要Uri，我通过在MediaStore.Images.Media中保存图像来获得它。

代码：

一个。从AsyncTask类获取下载的图像

public void processDownloadedImage(Bitmap bitmap) {
        if (bitmap == null) {
            Toast.makeText(this,"Image could not be downloaded and shared!",Toast.LENGTH_LONG).show();
        }
        else {
            downloadedImage = bitmap;
            checkPermissionShowShareSheet();
        }
    }

B中。检查Marshmallow及更高版本的许可

public void checkPermissionShowShareSheet() {

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            if (!Settings.System.canWrite(this)){
                requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE},2909);
            }
            else {


            updateImageUri(downloadedImage);
            showShareSheet(downloadedImageUri);
        }
    }
    else {
        updateImageUri(downloadedImage);
        showShareSheet(downloadedImageUri);
    }
}

℃。获取图像Uri

private void updateImageUri(Bitmap inImage){
        ByteArrayOutputStream bytes = new ByteArrayOutputStream();
        inImage.compress(Bitmap.CompressFormat.JPEG, 100, bytes);

        fixMediaDir();
        String path = MediaStore.Images.Media.insertImage(this.getContentResolver(), inImage, "SomeImage", null);
        storePathInSharedPreferences(path);
        Uri uri = Uri.parse(path);

        downloadedImageUri = uri;
    }

    void fixMediaDir() {
        File sdcard = Environment.getExternalStorageDirectory();
        if (sdcard != null) {
            File mediaDir = new File(sdcard, "DCIM/Camera");
            if (!mediaDir.exists()) {
                mediaDir.mkdirs();
            }
        }
    }

d。清单文件使用权限

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

问题：从下面行返回的值为空

String path = MediaStore.Images.Media.insertImage(this.getContentResolver(), inImage, "SomeImage", null);

有什么想法吗？

以下是Stackbacktrace的一部分：

Failed to insert image java.io.FileNotFoundException: No such file or directory       
at android.database.DatabaseUtils.readExceptionWithFileNotFoundExceptionFromParcel(DatabaseUtils.java:146)
at android.content.ContentProviderProxy.openAssetFile(ContentProviderNative.java:620)
at android.content.ContentResolver.openAssetFileDescriptor(ContentResolver.java:939)
at android.content.ContentResolver.openOutputStream(ContentResolver.java:686)
at android.content.ContentResolver.openOutputStream(ContentResolver.java:662)
at android.provider.MediaStore$Images$Media.insertImage(MediaStore.java:934)
at myorg.myapp.ImageDescription.updateImageUri(ImageDescription.java:165)

Answer 1

更改此

<uses-permission android:name="android.permission.read_external_storage" />

要

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

MediaStore.Images.Media.insertImage - java.io.FileNotFoundException - Android

1 个答案: