如何在此处输入Mediascanner代码?我需要在画廊上显示图像。尝试了很多解决方案,但没有任何效果。 给定代码的示例将很有用:
public void SaveImage(Bitmap bitmap)
{
final File myDir = new File(
Environment
.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
pref.getGalleryName());
myDir.mkdirs();
// fix
myDir.setExecutable(true);
myDir.setReadable(true);
myDir.setWritable(true);
Random generator = new Random();
int n = 100000;
n = generator.nextInt(n);
final String fname = "Filename" + n + ".jpg";
File file = new File(myDir, fname);
if (file.exists())
file.delete();
try
{
FileOutputStream out = new FileOutputStream(file);
bitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
out.flush();
out.close();
Toast.makeText(
_context,
_context.getString(R.string.toast_saved).replace("#",
"\"" + pref.getGalleryName() + "\""),
Toast.LENGTH_SHORT).show();
Log.d(TAG, "Image saved to: " + file.getAbsolutePath());
} catch (Exception e) {
e.printStackTrace();
Toast.makeText(_context,
_context.getString(R.string.toast_saved_failed),
Toast.LENGTH_LONG).show();
}
}
}
答案 0 :(得分:0)
我们不能在版本kitkat之后直接调用媒体扫描程序,它仅限于系统应用程序。 要更新库中的内容,您需要直接更新具有所需文件名的库的媒体库数据库。 这就是我为克服这个问题所做的。 此方法也比Mediascanner高效,因为Mediascanner方法需要大量的cpu资源。 Mediascanner基本上在我们的整个存储位置搜索多媒体内容,这可能会降低设备性能
public void saveImageToSDCard(Bitmap bitmap)
{
final File myDir = new File(
Environment
.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
pref.getGalleryName());
myDir.mkdirs();
Random generator = new Random();
int n = 100000;
n = generator.nextInt(n);
final String fname = "File" + n + ".jpg";
File file = new File(myDir, fname);
if (file.exists())
file.delete();
try {
FileOutputStream out = new FileOutputStream(file);
bitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
out.flush();
out.close();
Toast.makeText(
_context,
_context.getString(R.string.toast_saved).replace("#",
"\"" + pref.getGalleryName() + "\""),
Toast.LENGTH_SHORT).show();
Log.d(TAG, "Image saved to: " + file.getAbsolutePath());
// follow from here onwards
ContentValues values = new ContentValues();
values.put(MediaStore.Images.Media.DATA,file.getAbsolutePath());
values.put(MediaStore.Images.Media.MIME_TYPE,"image/jpeg");
_context.getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,values);
} catch (Exception e) {
e.printStackTrace();
Toast.makeText(_context,
_context.getString(R.string.toast_saved_failed),
Toast.LENGTH_LONG).show();
}
}