android pobierz bitmapę lub dźwięk z zasobów
Muszę pobrać bitmapę i dźwięk z zasobów. Staram się robić tak:
BitmapFactory.decodeFile("file:///android_asset/Files/Numbers/l1.png");
I tak:
getBitmapFromAsset("Files/Numbers/l1.png");
private Bitmap getBitmapFromAsset(String strName) {
AssetManager assetManager = getAssets();
InputStream istr = null;
try {
istr = assetManager.open(strName);
} catch (IOException e) {
e.printStackTrace();
}
Bitmap bitmap = BitmapFactory.decodeStream(istr);
return bitmap;
}
Ale dostaję tylko wolną przestrzeń, nie Obraz.
Jak to zrobić? 31
4 answers
public static Bitmap getBitmapFromAsset(Context context, String filePath) {
AssetManager assetManager = context.getAssets();
InputStream istr;
Bitmap bitmap = null;
try {
istr = assetManager.open(filePath);
bitmap = BitmapFactory.decodeStream(istr);
} catch (IOException e) {
// handle exception
}
return bitmap;
}
Ścieżka to po prostu nazwa pliku FX bitmap.png. jeśli używasz podfolderu bitmap / to jego bitmap/bitmap.png
104
Author: Warpzit,
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2014-08-27 21:26:40
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2014-08-27 21:26:40
Użyj tego kodu, który działa
try {
InputStream bitmap=getAssets().open("icon.png");
Bitmap bit=BitmapFactory.decodeStream(bitmap);
img.setImageBitmap(bit);
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
Update
Podczas dekodowania bitmapy częściej spotykamy się z wyjątkiem przepełnienia pamięci, jeśli Rozmiar obrazu jest bardzo duży. Więc czytanie artykułu Jak efektywnie wyświetlać obraz pomoże ci.
11
Author: Tofeeq,
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2015-08-19 00:51:04
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2015-08-19 00:51:04
Przyjęta odpowiedź nigdy nie zamyka InputStream
. Oto metoda użytkowa do uzyskania Bitmap
w folderze assets:
/**
* Retrieve a bitmap from assets.
*
* @param mgr
* The {@link AssetManager} obtained via {@link Context#getAssets()}
* @param path
* The path to the asset.
* @return The {@link Bitmap} or {@code null} if we failed to decode the file.
*/
public static Bitmap getBitmapFromAsset(AssetManager mgr, String path) {
InputStream is = null;
Bitmap bitmap = null;
try {
is = mgr.open(path);
bitmap = BitmapFactory.decodeStream(is);
} catch (final IOException e) {
bitmap = null;
} finally {
if (is != null) {
try {
is.close();
} catch (IOException ignored) {
}
}
}
return bitmap;
}
6
Author: Jared Rummler,
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2016-12-13 17:53:35
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2016-12-13 17:53:35
Metoda uzyskiwania bitmapy obrazu przechowywanego w folderze Assets.
public static Bitmap getBitmapFromAssets(Context context, String fileName, int width, int height) {
AssetManager assetManager = context.getAssets();
InputStream istr;
Bitmap bitmap = null;
try {
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
istr = assetManager.open(fileName);
// Calculate inSampleSize
options.inSampleSize = calculateInSampleSize(options, width, height);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
return BitmapFactory.decodeStream(istr, null, options);
} catch (IOException e) {
Log.e("hello", "Exception: " + e.getMessage());
}
return null;
}
Metoda zmiany rozmiaru bitmapy.
private static int calculateInSampleSize(
BitmapFactory.Options options, int reqWidth, int reqHeight) {
// Raw height and width of image
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
final int halfHeight = height / 2;
final int halfWidth = width / 2;
// Calculate the largest inSampleSize value that is a power of 2 and keeps both
// height and width larger than the requested height and width.
while ((halfHeight / inSampleSize) >= reqHeight
&& (halfWidth / inSampleSize) >= reqWidth) {
inSampleSize *= 2;
}
}
return inSampleSize;
}
0
Author: Anil Singhania,
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2018-06-29 07:58:41
Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2018-06-29 07:58:41