更新时间:2023-09-10 18:40:34
我发现了该解决方案的2种变体.两者都涉及将位图保存到存储中,但是图像不会出现在图库中.
I found 2 variants of the solution. Both involve saving Bitmap to storage, but the image will not appear in the gallery.
保存到外部存储
在标记之前添加到AndroidManifest.xml
Add into AndroidManifest.xml before tag
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" android:maxSdkVersion="18"/>
/**
* Saves the image as PNG to the app's private external storage folder.
* @param image Bitmap to save.
* @return Uri of the saved file or null
*/
private Uri saveImageExternal(Bitmap image) {
//TODO - Should be processed in another thread
Uri uri = null;
try {
File file = new File(getExternalFilesDir(Environment.DIRECTORY_PICTURES), "to-share.png");
FileOutputStream stream = new FileOutputStream(file);
image.compress(Bitmap.CompressFormat.PNG, 90, stream);
stream.close();
uri = Uri.fromFile(file);
} catch (IOException e) {
Log.d(TAG, "IOException while trying to write file for sharing: " + e.getMessage());
}
return uri;
}
外部存储可能无法访问,因此您应在尝试保存之前进行检查: https ://developer.android.com/training/data-storage/files
/**
* Checks if the external storage is writable.
* @return true if storage is writable, false otherwise
*/
public boolean isExternalStorageWritable() {
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state)) {
return true;
}
return false;
}
使用FileProvider保存到cacheDir.它不需要任何权限.
Saving to cacheDir using FileProvider. It does not require any permissions.
<manifest>
...
<application>
...
<provider
android:name="android.support.v4.content.FileProvider"
android:authorities="com.mydomain.fileprovider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/file_paths" />
</provider>
...
</application>
</manifest>
<?xml version="1.0" encoding="utf-8"?>
<resources>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
<cache-path name="shared_images" path="images/"/>
</paths>
</resources>
/**
* Saves the image as PNG to the app's cache directory.
* @param image Bitmap to save.
* @return Uri of the saved file or null
*/
private Uri saveImage(Bitmap image) {
//TODO - Should be processed in another thread
File imagesFolder = new File(getCacheDir(), "images");
Uri uri = null;
try {
imagesFolder.mkdirs();
File file = new File(imagesFolder, "shared_image.png");
FileOutputStream stream = new FileOutputStream(file);
image.compress(Bitmap.CompressFormat.PNG, 90, stream);
stream.flush();
stream.close();
uri = FileProvider.getUriForFile(this, "com.mydomain.fileprovider", file);
} catch (IOException e) {
Log.d(TAG, "IOException while trying to write file for sharing: " + e.getMessage());
}
return uri;
}
有关文件提供程序的更多信息- https://developer.android. com/reference/android/support/v4/content/FileProvider
More info about file provider - https://developer.android.com/reference/android/support/v4/content/FileProvider
压缩和保存可能很耗时,因此应该在其他线程中完成
/**
* Shares the PNG image from Uri.
* @param uri Uri of image to share.
*/
private void shareImageUri(Uri uri){
Intent intent = new Intent(android.content.Intent.ACTION_SEND);
intent.putExtra(Intent.EXTRA_STREAM, uri);
intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
intent.setType("image/png");
startActivity(intent);
}