Android中本地图片地址和Uri的相互装换

Android中本地图片地址和Uri的相互装换

前言:

项目中我们在用到手机中的相片的时候，因为需求不同，手机型号不同，我们需要将获取到的路径转成uri，或者将获取到的uri转成绝对路径。比如我的大华为G7，获取到的就是Uri，我要把它转成绝对地址。

获取到的:

content://media/external/images/media/212304

需要的:

file:///storage/emulated/0/Android/data/com.zn_android.zn/cache/PostPicture/20170905193015.jpg

通过查阅资料，找到了两个工具方法:

Uri转绝对路径:

/**
* Gets the corresponding path to a file from the given content:// URI
* uri转绝对路径
*
* @param selectedVideoUri The content:// URI to find the file path from
* @param contentResolver The content resolver to use to perform the query.
* @return the file path as a string
*/
public static String getFilePathFromContentUri(Uri selectedVideoUri, ContentResolver contentResolver) {
String filePath;
String[] filePathColumn = {MediaStore.MediaColumns.DATA};

Cursor cursor = contentResolver.query(selectedVideoUri, filePathColumn, null, null, null);
// 也可用下面的方法拿到cursor
// Cursor cursor = this.context.managedQuery(selectedVideoUri, filePathColumn, null, null, null);

cursor.moveToFirst();

int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
filePath = cursor.getString(columnIndex);
cursor.close();
return filePath;
}

绝对路径转Uri:

/**
* Gets the content:// URI from the given corresponding path to a file
* 绝对路径转uri
*
* @param context
* @param imageFile
* @return content Uri
*/
public static Uri getImageContentUri(Context context, java.io.File imageFile) {
String filePath = imageFile.getAbsolutePath();
Cursor cursor = context.getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
new String[]{MediaStore.Images.Media._ID}, MediaStore.Images.Media.DATA + "=? ",
new String[]{filePath}, null);
if (cursor != null && cursor.moveToFirst()) {
int id = cursor.getInt(cursor.getColumnIndex(MediaStore.MediaColumns._ID));
Uri baseUri = Uri.parse("content://media/external/images/media");
return Uri.withAppendedPath(baseUri, "" + id);
} else {
if (imageFile.exists()) {
ContentValues values = new ContentValues();
values.put(MediaStore.Images.Media.DATA, filePath);
return context.getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
} else {
return null;
}
}
}