// sauve une image bipmap dans un fichier
private File saveBitmap(Bitmap bitmap, String path) {
File file = null;
if (bitmap != null) {
file = new File(path);
try {
FileOutputStream outputStream = null;
try {
//outputStream = new FileOutputStream(path); //here is set your file path where you want to save or also here you can set file object directly
//bitmap.compress(Bitmap.CompressFormat.PNG, 100, outputStream); // bitmap is your Bitmap instance, if you want to compress it you can compress reduce percentage
// PNG is a lossless format, the compression factor (100) is ignored
} catch (Exception e) {
//e.printStackTrace();
} finally {
try {
if (outputStream != null) {
outputStream.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
return file;
}
and it doesn't compile so i tried :
// sauve une image bipmap dans un fichier
private File saveBitmap(Bitmap bitmap, String path) {
File file = null;
if (bitmap != null) {
file = new File(path);
FileOutputStream outputStream ;
}
return file;
}
but the only line:
FileOutputStream outputStream =null;
generate a GIT compil error...
so how can i save my bipmapImage in a file ?
Yes vknw360, it is not a problem to compress bitmap.
the problem is to create the ".bmp" file corresponding. to do that, all codes I have found do it with "FileOutputStream outputStream" . It works well with Android studio,
but is not accepted by AI compilator and give me an error !
Ken, your link use "FileOutputStream outputStream" too so i have the same problem: error when i compil it
But why are you compressing Bitmap to bmp file.
You should compress it to png or jpeg file.
Remember you have to return path (String) not a stream or file.
Hi, you can return the image (byte[]) as an Object and pass it to my Extension :https://ullisroboterseite.de/android-AI2-utils-en.html#img. The extension displays it on an AI2 Image Block. So you don't have to store it and worry about wasting memory. You will find my e-mail address on my page if there are further questions.
Thanks Ulli,
It seems to be a good way, but how do i return my image as an object ?
i code in Mp3Tags:
@SimpleFunction(description = "return file's album art")
public Object album_art(String song){
File file=new File(song);
AlbumArt art;
art = new AlbumArt() ;
art.album_art(song);
return art;
}
and a new class AlbumArt
package jml.AlbumArt;
import java.io.File;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.media.MediaMetadataRetriever;
public class AlbumArt {
MediaMetadataRetriever metaRetriever;
byte image =null;
public void AlbumArt(){
}
public void album_art(String song){
File file=new File(song);
byte art = new byte[0];
metaRetriever = new MediaMetadataRetriever();
if (file.exists()) {
metaRetriever.setDataSource(song);
try {
art = metaRetriever.getEmbeddedPicture();
Bitmap songImage = BitmapFactory
.decodeByteArray(art, 0, art.length);
} catch (Exception e) {
}
}else {
song="file not found";
}
image=art;
}
}
I save both Mp3Tags.java and AlbumArt.java in scr/jml/
but i have compil error :
[javac] C:\Users\Jml\appinventor-sources\appinventor\components\src\jml\Mp3Tags.java:156: error: cannot find symbol
[javac] AlbumArt art;
[javac] ^
[javac] symbol: class AlbumArt
[javac] location: class Mp3Tags
[javac] C:\Users\Jml\appinventor-sources\appinventor\components\src\jml\Mp3Tags.java:157: error: cannot find symbol
[javac] art = new AlbumArt() ;
[javac] ^
[javac] symbol: class AlbumArt
[javac] location: class Mp3Tags
[javac] Note: Some input files use or override a deprecated API.
[javac] Note: Recompile with -Xlint:deprecation for details.
[javac] Note: Some input files use unchecked or unsafe operations.
[javac] Note: Recompile with -Xlint:unchecked for details.
[javac] 2 errors
You can return Object, which will just be treated as an opaque thing by the blocks language. The user won't be able to do anything to manipulate it, but it can be passed to other methods. In this case though, you probably want to write the album art data to a file somewhere and return the path so that it can be assigned to a Button's Image property or the Image's Picture property.
I tried this ewpatton, but i didn't succed to write the album art in a file: all exemples i have seen to do that use "FileOutputStream" but as soon as i use it in my code, AI compiler return an error...so i don't know how save my bitmap in a file !
What was the error? Did you forget to import FileOutputStream? You may want to look at code such as Canvas's SaveAs function, which writes the Canvas image to a file. It's definitely feasible to write to a file from an extension.