拍照时,MediaStore contentResolver.insert()创建副本而不是替换现有文件(Android Q:29)
我正在尝试使用以下代码保存从相机拍摄的图像:拍照时,MediaStore contentResolver.insert()创建副本而不是替换现有文件(Android Q:29),android,android-10.0,Android,Android 10.0,我正在尝试使用以下代码保存从相机拍摄的图像: @RequiresApi(Build.VERSION_CODES.Q) private fun setImageUri(): Uri { val resolver = contentResolver val contentValues = ContentValues().apply { put(MediaStore.MediaColumns.DISPLAY_NAME, "house2.jpg") put
@RequiresApi(Build.VERSION_CODES.Q)
private fun setImageUri(): Uri {
val resolver = contentResolver
val contentValues = ContentValues().apply {
put(MediaStore.MediaColumns.DISPLAY_NAME, "house2.jpg")
put(MediaStore.MediaColumns.MIME_TYPE, "image/jpeg")
put(MediaStore.MediaColumns.RELATIVE_PATH, "Pictures/OLArt")
}
imageUri = resolver.insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, contentValues)
return imageUri!!
}
该函数首次运行良好。但是,当映像(house2.jpg)已经存在时,系统将创建另一个名为“house2(1.jpg)”、“house2(2.jpg”等文件(而不是替换旧文件)
我是否可以在contentValues中设置任何内容来强制冲突解决程序替换该文件,而不是创建其副本
以下是拍摄意图的代码
Intent(MediaStore.ACTION_IMAGE_CAPTURE).also { takePictureIntent ->
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, setImageUri()) //<- i paste in the imageUri here
// Ensure that there's a camera activity to handle the intent
takePictureIntent.resolveActivity(packageManager)?.also {
startActivityForResult(takePictureIntent, 102)
}
}
Intent(MediaStore.ACTION\u IMAGE\u CAPTURE)。另外{takePictureContent->
takePictureContent.putExtra(MediaStore.EXTRA\u输出,setImageUri())/您尝试过使用吗
检查它是否在没有任何文件的情况下创建了一个新文件,如果它不起作用,则根据文件是否已创建,使用insert或update。这是正确的预期行为。之所以会看到不同的计算后缀,可能是因为您正在将文件保存在同一文件夹中,因此Android必须创建一个唯一的名称以便允许文件存在于同一位置
该方法旨在创建始终新的记录。它返回的Uri始终是新插入的记录。但是,如果该文件保存在一个文件夹中,其中已经有另一个同名文件,则该文件名必须不同,Android将附加数值
如果希望替换现有记录,则必须首先找到其Uri,然后通过调用ContentResolver方法来使用它
如果您正在保存相机应用程序中的照片,则可以使用当前时间作为名称,包括毫秒,以确保其唯一性。@commonware的评论有帮助
我们的想法是
查询是否已存在带有解析器的文件。Query()
如果是,则从光标中提取contentUri
否则,请使用resolver.insert()
创建查询选择时需要注意的一点是,MediaStore.MediaColumns.RELATIVE_路径需要终止“/”
i、 e.“Pictures/OLArt/”Angel Koh的回答是正确的
我只是用Java发布它:
@RequiresApi(Build.VERSION_CODES.Q)
public static Uri CheckIfUriExistOnPublicDirectory(Context c ,String[] projection, String selection){
ContentResolver resolver = c.getContentResolver();
Cursor cur = resolver.query(MediaStore.Downloads.EXTERNAL_CONTENT_URI, projection, selection , null, null);
if (cur != null) {
if(cur.getCount()>0){
if (cur.moveToFirst()) {
String filePath = cur.getString(0);
long id = cur.getLong(cur.getColumnIndexOrThrow(MediaStore.MediaColumns._ID));
String displayName = cur.getString(cur.getColumnIndexOrThrow(MediaStore.MediaColumns.DISPLAY_NAME) );
String relativePath = cur.getString(cur.getColumnIndexOrThrow(MediaStore.MediaColumns.RELATIVE_PATH) );
long z = cur.getLong(cur.getColumnIndexOrThrow(MediaStore.MediaColumns.DATE_MODIFIED) );
return imageUri = ContentUris.withAppendedId(
MediaStore.Images.Media.EXTERNAL_CONTENT_URI, id);
} else {
// Uri was ok but no entry found.
}
}else{
// content Uri was invalid or some other error occurred
}
cur.close();
} else {
// content Uri was invalid or some other error occurred
}
return null;
}
方法的定义和用法:
String[] projection = {MediaStore.MediaColumns._ID,
MediaStore.MediaColumns.DISPLAY_NAME,
MediaStore.MediaColumns.RELATIVE_PATH,
MediaStore.MediaColumns.DATE_MODIFIED
};
String selection = MediaStore.MediaColumns.RELATIVE_PATH + "='" + Environment.DIRECTORY_DOWNLOADS + File.separator + folderName + File.separator + "' AND "
+ MediaStore.MediaColumns.DISPLAY_NAME+"='" + fileName + "'";
uri = CheckIfUriExistOnPublicDirectory(context,projection,selection);
if(uri != null){
// file already exist
}else{
// file not exist, insert
}
另见:上帝保佑你。
@RequiresApi(Build.VERSION_CODES.Q)
private fun setImageUriQ(): Uri {
val resolver = contentResolver
imageUri = getExistingImageUriOrNullQ() //try to retrieve existing uri (if any)
if (imageUri == null) {
//=========================
// existing codes for resolver.insert
//(SNIPPED)
//=========================
}
return imageUri!!
}
@RequiresApi(Build.VERSION_CODES.Q)
public static Uri CheckIfUriExistOnPublicDirectory(Context c ,String[] projection, String selection){
ContentResolver resolver = c.getContentResolver();
Cursor cur = resolver.query(MediaStore.Downloads.EXTERNAL_CONTENT_URI, projection, selection , null, null);
if (cur != null) {
if(cur.getCount()>0){
if (cur.moveToFirst()) {
String filePath = cur.getString(0);
long id = cur.getLong(cur.getColumnIndexOrThrow(MediaStore.MediaColumns._ID));
String displayName = cur.getString(cur.getColumnIndexOrThrow(MediaStore.MediaColumns.DISPLAY_NAME) );
String relativePath = cur.getString(cur.getColumnIndexOrThrow(MediaStore.MediaColumns.RELATIVE_PATH) );
long z = cur.getLong(cur.getColumnIndexOrThrow(MediaStore.MediaColumns.DATE_MODIFIED) );
return imageUri = ContentUris.withAppendedId(
MediaStore.Images.Media.EXTERNAL_CONTENT_URI, id);
} else {
// Uri was ok but no entry found.
}
}else{
// content Uri was invalid or some other error occurred
}
cur.close();
} else {
// content Uri was invalid or some other error occurred
}
return null;
}
String[] projection = {MediaStore.MediaColumns._ID,
MediaStore.MediaColumns.DISPLAY_NAME,
MediaStore.MediaColumns.RELATIVE_PATH,
MediaStore.MediaColumns.DATE_MODIFIED
};
String selection = MediaStore.MediaColumns.RELATIVE_PATH + "='" + Environment.DIRECTORY_DOWNLOADS + File.separator + folderName + File.separator + "' AND "
+ MediaStore.MediaColumns.DISPLAY_NAME+"='" + fileName + "'";
uri = CheckIfUriExistOnPublicDirectory(context,projection,selection);
if(uri != null){
// file already exist
}else{
// file not exist, insert
}