[英]how to save bitmap to android gallery
unfortunately the solutions I've found didn't work on android 5.1.1.不幸的是,我找到的解决方案在 android 5.1.1 上不起作用。 I have a bitmap called source.我有一个名为 source 的位图。 I need to save it directly to my phone's gallery.我需要将它直接保存到我手机的图库中。 My manifest contains <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
Can you give me a working method to do this?我的清单包含<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
你能给我一个工作方法吗?
There were several different ways to do it before API 29 (Android Q) but all of them involved one or a few APIs that are deprecated with Q. In 2019, here's a way to do it that is both backward and forward compatible:在 API 29 (Android Q) 之前有几种不同的方法可以做到这一点,但所有这些都涉及一个或几个被 Q 弃用的 API。在 2019 年,这是一种既向后兼容又向前兼容的方法:
(And since it is 2019 so I will write in Kotlin) (因为是 2019 年所以我会用 Kotlin 写)
/// @param folderName can be your app's name
private fun saveImage(bitmap: Bitmap, context: Context, folderName: String) {
if (android.os.Build.VERSION.SDK_INT >= 29) {
val values = contentValues()
values.put(MediaStore.Images.Media.RELATIVE_PATH, "Pictures/" + folderName)
values.put(MediaStore.Images.Media.IS_PENDING, true)
// RELATIVE_PATH and IS_PENDING are introduced in API 29.
val uri: Uri? = context.contentResolver.insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values)
if (uri != null) {
saveImageToStream(bitmap, context.contentResolver.openOutputStream(uri))
values.put(MediaStore.Images.Media.IS_PENDING, false)
context.contentResolver.update(uri, values, null, null)
}
} else {
val directory = File(Environment.getExternalStorageDirectory().toString() + separator + folderName)
// getExternalStorageDirectory is deprecated in API 29
if (!directory.exists()) {
directory.mkdirs()
}
val fileName = System.currentTimeMillis().toString() + ".png"
val file = File(directory, fileName)
saveImageToStream(bitmap, FileOutputStream(file))
if (file.absolutePath != null) {
val values = contentValues()
values.put(MediaStore.Images.Media.DATA, file.absolutePath)
// .DATA is deprecated in API 29
context.contentResolver.insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values)
}
}
}
private fun contentValues() : ContentValues {
val values = ContentValues()
values.put(MediaStore.Images.Media.MIME_TYPE, "image/png")
values.put(MediaStore.Images.Media.DATE_ADDED, System.currentTimeMillis() / 1000);
values.put(MediaStore.Images.Media.DATE_TAKEN, System.currentTimeMillis());
return values
}
private fun saveImageToStream(bitmap: Bitmap, outputStream: OutputStream?) {
if (outputStream != null) {
try {
bitmap.compress(Bitmap.CompressFormat.PNG, 100, outputStream)
outputStream.close()
} catch (e: Exception) {
e.printStackTrace()
}
}
}
Also, before calling this, you need to have WRITE_EXTERNAL_STORAGE
first.此外,在调用之前,您需要先拥有WRITE_EXTERNAL_STORAGE
。
Use this one:使用这个:
private void saveImage(Bitmap finalBitmap, String image_name) {
String root = Environment.getExternalStorageDirectory().toString();
File myDir = new File(root);
myDir.mkdirs();
String fname = "Image-" + image_name+ ".jpg";
File file = new File(myDir, fname);
if (file.exists()) file.delete();
Log.i("LOAD", root + fname);
try {
FileOutputStream out = new FileOutputStream(file);
finalBitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
out.flush();
out.close();
} catch (Exception e) {
e.printStackTrace();
}
}
Use this code this we help you to store images into a particular folder which is saved_images and that folder images show in gallery immediately.使用此代码,我们可以帮助您将图像存储到一个特定的文件夹中,即saved_images 并且该文件夹图像立即显示在图库中。
private void SaveImage(Bitmap finalBitmap) {
String root = Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES).toString();
File myDir = new File(root + "/saved_images");
myDir.mkdirs();
Random generator = new Random();
int n = 10000;
n = generator.nextInt(n);
String fname = "Image-"+ n +".jpg";
File file = new File (myDir, fname);
if (file.exists ()) file.delete ();
try {
FileOutputStream out = new FileOutputStream(file);
finalBitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
// sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED,
// Uri.parse("file://"+ Environment.getExternalStorageDirectory())));
out.flush();
out.close();
} catch (Exception e) {
e.printStackTrace();
}
// Tell the media scanner about the new file so that it is
// immediately available to the user.
MediaScannerConnection.scanFile(this, new String[]{file.toString()}, null,
new MediaScannerConnection.OnScanCompletedListener() {
public void onScanCompleted(String path, Uri uri) {
Log.i("ExternalStorage", "Scanned " + path + ":");
Log.i("ExternalStorage", "-> uri=" + uri);
}
});
}
From Android Q there are changes in saving image to gallery.Thanks to @BaoLei, here is my answer in java if anybody needs it.从 Android Q 开始,在将图像保存到画廊方面发生了变化。感谢 @BaoLei,如果有人需要,这里是我在 Java 中的答案。
private void saveImage(Bitmap bitmap) {
if (android.os.Build.VERSION.SDK_INT >= 29) {
ContentValues values = contentValues();
values.put(MediaStore.Images.Media.RELATIVE_PATH, "Pictures/" + getString(R.string.app_name));
values.put(MediaStore.Images.Media.IS_PENDING, true);
Uri uri = this.getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
if (uri != null) {
try {
saveImageToStream(bitmap, this.getContentResolver().openOutputStream(uri));
values.put(MediaStore.Images.Media.IS_PENDING, false);
this.getContentResolver().update(uri, values, null, null);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
} else {
File directory = new File(Environment.getExternalStorageDirectory().toString() + '/' + getString(R.string.app_name));
if (!directory.exists()) {
directory.mkdirs();
}
String fileName = System.currentTimeMillis() + ".png";
File file = new File(directory, fileName);
try {
saveImageToStream(bitmap, new FileOutputStream(file));
ContentValues values = new ContentValues();
values.put(MediaStore.Images.Media.DATA, file.getAbsolutePath());
this.getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
}
private ContentValues contentValues() {
ContentValues values = new ContentValues();
values.put(MediaStore.Images.Media.MIME_TYPE, "image/png");
values.put(MediaStore.Images.Media.DATE_ADDED, System.currentTimeMillis() / 1000);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
values.put(MediaStore.Images.Media.DATE_TAKEN, System.currentTimeMillis());
}
return values;
}
private void saveImageToStream(Bitmap bitmap, OutputStream outputStream) {
if (outputStream != null) {
try {
bitmap.compress(Bitmap.CompressFormat.PNG, 100, outputStream);
outputStream.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
在一行中做MediaStore.Images.Media.insertImage(applicationContext.getContentResolver(), IMAGE ,"nameofimage" , "description");
Here is a fully working solution in Kotlin:这是 Kotlin 中一个完全有效的解决方案:
fun saveToGallery(context: Context, bitmap: Bitmap, albumName: String) {
val filename = "${System.currentTimeMillis()}.png"
val write: (OutputStream) -> Boolean = {
bitmap.compress(Bitmap.CompressFormat.PNG, 100, it)
}
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
val contentValues = ContentValues().apply {
put(MediaStore.MediaColumns.DISPLAY_NAME, filename)
put(MediaStore.MediaColumns.MIME_TYPE, "image/png")
put(MediaStore.MediaColumns.RELATIVE_PATH, "${Environment.DIRECTORY_DCIM}/$albumName")
}
context.contentResolver.let {
it.insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, contentValues)?.let { uri ->
it.openOutputStream(uri)?.let(write)
}
}
} else {
val imagesDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM).toString() + File.separator + albumName
val file = File(imagesDir)
if (!file.exists()) {
file.mkdir()
}
val image = File(imagesDir, filename)
write(FileOutputStream(image))
}
}
I'd like to add Java code based on @Bao Lei 's answer that I used in my app.我想根据我在我的应用程序中使用的@Bao Lei 的回答添加 Java 代码。
private void saveImage(Bitmap bitmap, Context context, String folderName) throws FileNotFoundException {
if (android.os.Build.VERSION.SDK_INT >= 29) {
ContentValues values = new ContentValues();
values.put(MediaStore.Images.Media.RELATIVE_PATH, "Pictures/" + folderName);
values.put(MediaStore.Images.Media.IS_PENDING, true);
// RELATIVE_PATH and IS_PENDING are introduced in API 29.
Uri uri = context.getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
if (uri != null) {
saveImageToStream(bitmap, context.getContentResolver().openOutputStream(uri));
values.put(MediaStore.Images.Media.IS_PENDING, false);
context.getContentResolver().update(uri, values, null, null);
}
} else {
dir = new File(getApplicationContext().getExternalFilesDir(Environment.DIRECTORY_PICTURES),"");
// getExternalStorageDirectory is deprecated in API 29
if (!dir.exists()) {
dir.mkdirs();
}
java.util.Date date = new java.util.Date();
imageFile = new File(dir.getAbsolutePath()
+ File.separator
+ new Timestamp(date.getTime()).toString()
+ "Image.jpg");
imageFile = new File(dir.getAbsolutePath()
+ File.separator
+ new Timestamp(date.getTime()).toString()
+ "Image.jpg");
saveImageToStream(bitmap, new FileOutputStream(imageFile));
if (imageFile.getAbsolutePath() != null) {
ContentValues values = new ContentValues();
values.put(MediaStore.Images.Media.DATA, imageFile.getAbsolutePath());
// .DATA is deprecated in API 29
context.getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
}
}
}
private ContentValues contentValues() {
ContentValues values = new ContentValues();
values.put(MediaStore.Images.Media.MIME_TYPE, "image/png");
values.put(MediaStore.Images.Media.DATE_ADDED, System.currentTimeMillis() / 1000);
values.put(MediaStore.Images.Media.DATE_TAKEN, System.currentTimeMillis());
return values;
}
private void saveImageToStream(Bitmap bitmap, OutputStream outputStream) {
if (outputStream != null) {
try {
bitmap.compress(Bitmap.CompressFormat.PNG, 100, outputStream);
outputStream.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
This one worked fine in my app.这个在我的应用程序中运行良好。
Now we have android10 and android11, so here is an updated version, that will work in all android devices.现在我们有 android10 和 android11,所以这里有一个更新版本,可以在所有 android 设备上运行。
Make sure you have the WRITE_EXTERNAL_STORAGE
permission before calling this function.在调用此函数之前,请确保您拥有WRITE_EXTERNAL_STORAGE
权限。
private fun saveMediaToStorage(bitmap: Bitmap) {
val filename = "${System.currentTimeMillis()}.jpg"
var fos: OutputStream? = null
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
contentResolver?.also { resolver ->
val contentValues = ContentValues().apply {
put(MediaStore.MediaColumns.DISPLAY_NAME, filename)
put(MediaStore.MediaColumns.MIME_TYPE, "image/jpg")
put(MediaStore.MediaColumns.RELATIVE_PATH, Environment.DIRECTORY_PICTURES)
}
val imageUri: Uri? =
resolver.insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, contentValues)
fos = imageUri?.let { resolver.openOutputStream(it) }
}
} else {
val imagesDir =
Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES)
val image = File(imagesDir, filename)
fos = FileOutputStream(image)
}
fos?.use {
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, it)
toast("Saved to Photos")
}
}
Its kotlin, and I think very straight forward and self explaining code.它的 kotlin,我认为非常直接和自我解释的代码。 But still if you have a problem, comment below and I will explain.但是如果你有问题,请在下面评论,我会解释。
Reference: Android Save Bitmap to Gallery Tutorial .参考: Android Save Bitmap to Gallery 教程。
For Media Scanning, you can simply do对于媒体扫描,您只需执行
val intent = Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE)
intent.data = Uri.fromFile(path) // path must be of File type
context.sendBroadcast(intent)
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