import android.media.MediaMetadataRetriever;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import java.io.ByteArrayOutputStream;
import java.io.FileOutputStream;
import java.util.HashMap;
import java.util.Map;
import io.flutter.app.FlutterActivity;
import io.flutter.plugin.common.MethodChannel;
import io.flutter.plugins.GeneratedPluginRegistrant;
public class MainActivity extends FlutterActivity {
private static String TAG = "Android Platform";
private static final int HIGH_QUALITY_MIN_VAL = 70;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
GeneratedPluginRegistrant.registerWith(this);
new MethodChannel(getFlutterView(), "app.messio.channel").setMethodCallHandler(
(call, result) -> {
final Map<String, Object> args = call.arguments();
try {
final String video = (String) args.get("video");
final int format = (int) args.get("format");
final int maxhow = (int) args.get("maxhow");
final int quality = (int) args.get("quality");
new Thread(() -> {
if (call.method.equals("file")) {
final String path = (String) args.get("path");
String data = buildThumbnailFile(video, path, format, maxhow, quality);
runOnUiThread(()-> result.success(data));
} else if (call.method.equals("data")) {
byte[] data = buildThumbnailData(video, format, maxhow, quality);
runOnUiThread(()-> result.success(data));
} else {
runOnUiThread(result::notImplemented);
}
}).start();
} catch (Exception e) {
e.printStackTrace();
result.error("exception", e.getMessage(), null);
}
});
}
private static Bitmap.CompressFormat intToFormat(int format) {
switch (format) {
default:
case 0:
return Bitmap.CompressFormat.JPEG;
case 1:
return Bitmap.CompressFormat.PNG;
case 2:
return Bitmap.CompressFormat.WEBP;
}
}
private static String formatExt(int format) {
switch (format) {
default:
case 0:
return "jpg";
case 1:
return "png";
case 2:
return "webp";
}
}
private byte[] buildThumbnailData(String vidPath, int format, int maxhow, int quality) {
Log.d(TAG, String.format("buildThumbnailData( format:%d, maxhow:%d, quality:%d )", format, maxhow, quality));
Bitmap bitmap = createVideoThumbnail(vidPath, maxhow);
if (bitmap == null)
throw new NullPointerException();
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bitmap.compress(intToFormat(format), quality, stream);
bitmap.recycle();
if (bitmap == null)
throw new NullPointerException();
return stream.toByteArray();
}
private String buildThumbnailFile(String vidPath, String path, int format, int maxhow, int quality) {
Log.d(TAG, String.format("buildThumbnailFile( format:%d, maxhow:%d, quality:%d )", format, maxhow, quality));
final byte bytes[] = buildThumbnailData(vidPath, format, maxhow, quality);
final String ext = formatExt(format);
final int i = vidPath.lastIndexOf(".");
String fullpath = vidPath.substring(0, i + 1) + ext;
if (path != null) {
if (path.endsWith(ext)) {
fullpath = path;
} else {
// try to save to same folder as the vidPath
final int j = fullpath.lastIndexOf("/");
if (path.endsWith("/")) {
fullpath = path + fullpath.substring(j + 1);
} else {
fullpath = path + fullpath.substring(j);
}
}
}
try {
FileOutputStream f = new FileOutputStream(fullpath);
f.write(bytes);
f.close();
Log.d(TAG, String.format("buildThumbnailFile( written:%d )", bytes.length));
} catch (java.io.IOException e) {
e.getStackTrace();
throw new RuntimeException(e);
}
return fullpath;
}
/**
* Create a video thumbnail for a video. May return null if the video is corrupt
* or the format is not supported.
*
* @param video the URI of video
* @param targetSize max width or height of the thumbnail
*/
public static Bitmap createVideoThumbnail(String video, int targetSize) {
Bitmap bitmap = null;
MediaMetadataRetriever retriever = new MediaMetadataRetriever();
try {
Log.d(TAG, String.format("setDataSource: %s )", video));
if (video.startsWith("file://") || video.startsWith("/")) {
retriever.setDataSource(video);
} else {
retriever.setDataSource(video, new HashMap<String, String>());
}
bitmap = retriever.getFrameAtTime(-1);
} catch (IllegalArgumentException ex) {
ex.printStackTrace();
} catch (RuntimeException ex) {
ex.printStackTrace();
} finally {
try {
retriever.release();
} catch (RuntimeException ex) {
ex.printStackTrace();
}
}
if (bitmap == null)
return null;
if (targetSize != 0) {
int width = bitmap.getWidth();
int height = bitmap.getHeight();
int max = Math.max(width, height);
float scale = (float) targetSize / max;
int w = Math.round(scale * width);
int h = Math.round(scale * height);
Log.d(TAG, String.format("original w:%d, h:%d, scale:%6.4f => %d, %d", width, height, scale, w, h));
bitmap = Bitmap.createScaledBitmap(bitmap, w, h, true);
}
return bitmap;
}
}```
kotlin one is
```import android.os.Bundle
import io.flutter.app.FlutterActivity
import io.flutter.plugins.GeneratedPluginRegistrant
class MainActivity: FlutterActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
GeneratedPluginRegistrant.registerWith(this)
}
}
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