如何使用JAVA将pdf文件保存在Android 10及更高版本的Media Store中? [英] How to save pdf file in a Media Store in Android 10 and above using JAVA?
本文介绍了如何使用JAVA将pdf文件保存在Android 10及更高版本的Media Store中?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
更新:
要保存PDF文件:
在下面的答案部分.
要保存位图文件:
@RequiresApi(api = Build.VERSION_CODES.Q)
@NonNull
private Uri saveBitmap(@NonNull final Context context, @NonNull final Bitmap bitmap,
@NonNull final Bitmap.CompressFormat format, @NonNull final String mimeType,
@NonNull final String displayName, @Nullable final String subFolder) throws IOException {
String relativeLocation = Environment.DIRECTORY_PICTURES;
if (!TextUtils.isEmpty(subFolder)) {
relativeLocation += File.separator + subFolder;
}
final ContentValues contentValues = new ContentValues();
contentValues.put(MediaStore.MediaColumns.DISPLAY_NAME, displayName);
contentValues.put(MediaStore.MediaColumns.MIME_TYPE, mimeType);
contentValues.put(MediaStore.MediaColumns.RELATIVE_PATH, relativeLocation);
final ContentResolver resolver = context.getContentResolver();
OutputStream stream = null;
Uri uri = null;
try {
final Uri contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
uri = resolver.insert(contentUri, contentValues);
if (uri == null) {
throw new IOException("Failed to create new MediaStore record.");
}
stream = resolver.openOutputStream(uri);
if (stream == null) {
throw new IOException("Failed to get output stream.");
}
if (!bitmap.compress(format, 95, stream)) {
throw new IOException("Failed to save bitmap.");
}
return uri;
} catch (IOException e) {
if (uri != null) {
// Don't leave an orphan entry in the MediaStore
resolver.delete(uri, null, null);
}
throw e;
} finally {
if (stream != null) {
stream.close();
}
}
}
推荐答案
在Android 10及更高版本中保存PDF文件:
@RequiresApi(api = Build.VERSION_CODES.Q)
private void savePdfAndLogUri() {
try {
InputStream in = getAssets().open("eliza.pdf");
Uri savedFileUri = savePDFFile(MainActivity.this, in, "files/pdf", "eliza.pdf", "resume");
Log.d("URI: ", savedFileUri.toString());
} catch (IOException e) {
e.printStackTrace();
}
}
@RequiresApi(api = Build.VERSION_CODES.Q)
@NonNull
private Uri savePDFFile(@NonNull final Context context, @NonNull InputStream in,
@NonNull final String mimeType,
@NonNull final String displayName, @Nullable final String subFolder) throws IOException {
String relativeLocation = Environment.DIRECTORY_DOCUMENTS;
if (!TextUtils.isEmpty(subFolder)) {
relativeLocation += File.separator + subFolder;
}
final ContentValues contentValues = new ContentValues();
contentValues.put(MediaStore.MediaColumns.DISPLAY_NAME, displayName);
contentValues.put(MediaStore.MediaColumns.MIME_TYPE, mimeType);
contentValues.put(MediaStore.MediaColumns.RELATIVE_PATH, relativeLocation);
contentValues.put(MediaStore.Video.Media.TITLE, "SomeName");
contentValues.put(MediaStore.Video.Media.DATE_ADDED, System.currentTimeMillis() / 1000);
contentValues.put(MediaStore.Video.Media.DATE_TAKEN, System.currentTimeMillis());
final ContentResolver resolver = context.getContentResolver();
OutputStream stream = null;
Uri uri = null;
try {
final Uri contentUri = MediaStore.Files.getContentUri("external");
uri = resolver.insert(contentUri, contentValues);
ParcelFileDescriptor pfd;
try {
assert uri != null;
pfd = getContentResolver().openFileDescriptor(uri, "w");
assert pfd != null;
FileOutputStream out = new FileOutputStream(pfd.getFileDescriptor());
byte[] buf = new byte[4 * 1024];
int len;
while ((len = in.read(buf)) > 0) {
out.write(buf, 0, len);
}
out.close();
in.close();
pfd.close();
} catch (Exception e) {
e.printStackTrace();
}
contentValues.clear();
contentValues.put(MediaStore.Video.Media.IS_PENDING, 0);
getContentResolver().update(uri, contentValues, null, null);
stream = resolver.openOutputStream(uri);
if (stream == null) {
throw new IOException("Failed to get output stream.");
}
return uri;
} catch (IOException e) {
// Don't leave an orphan entry in the MediaStore
resolver.delete(uri, null, null);
throw e;
} finally {
if (stream != null) {
stream.close();
}
}
}
这篇关于如何使用JAVA将pdf文件保存在Android 10及更高版本的Media Store中?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文