guanshu,明代,flash模块
在项目中需要用到将uri转换为绝对路径，在网上找到一个方法，做个笔记
网上有不少方法，但是有的对4.4后的版本无效，这里的方法可以在4.4之后的版本将uri转换为绝对路径
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public class getpathfromuri {
/**
* 专为android4.4设计的从uri获取文件绝对路径
*/
public static string getpath(final context context, final uri uri) {
final boolean iskitkat = build.version.sdk_int >= build.version_codes.kitkat;
// documentprovider
if (iskitkat && documentscontract.isdocumenturi(context, uri)) {
// externalstorageprovider
if (isexternalstoragedocument(uri)) {
final string docid = documentscontract.getdocumentid(uri);
final string[] split = docid.split(":");
final string type = split[0];
if ("primary".equalsignorecase(type)) {
return environment.getexternalstoragedirectory() + "/" + split[1];
}
}
// downloadsprovider
else if (isdownloadsdocument(uri)) {
final string id = documentscontract.getdocumentid(uri);
final uri contenturi = contenturis.withappendedid(
uri.parse("content://downloads/public_downloads"), long.valueof(id));
return getdatacolumn(context, contenturi, null, null);
}
// mediaprovider
else if (ismediadocument(uri)) {
final string docid = documentscontract.getdocumentid(uri);
final string[] split = docid.split(":");
final string type = split[0];
uri contenturi = null;
if ("image".equals(type)) {
contenturi = mediastore.images.media.external_content_uri;
} else if ("video".equals(type)) {
contenturi = mediastore.video.media.external_content_uri;
} else if ("audio".equals(type)) {
contenturi = mediastore.audio.media.external_content_uri;
}
final string selection = "_id=?";
final string[] selectionargs = new string[]{split[1]};
return getdatacolumn(context, contenturi, selection, selectionargs);
}
}
// mediastore (and general)
else if ("content".equalsignorecase(uri.getscheme())) {
return getdatacolumn(context, uri, null, null);
}
// file
else if ("file".equalsignorecase(uri.getscheme())) {
return uri.getpath();
}
return null;
}
/**
* get the value of the data column for this uri. this is useful for
* mediastore uris, and other file-based contentproviders.
*
* @param context the context.
* @param uri the uri to query.
* @param selection (optional) filter used in the query.
* @param selectionargs (optional) selection arguments used in the query.
* @return the value of the _data column, which is typically a file path.
*/
public static string getdatacolumn(context context, uri uri, string selection,
string[] selectionargs) {
cursor cursor = null;
final string column = "_data";
final string[] projection = {column};
try {
cursor = context.getcontentresolver().query(uri, projection, selection, selectionargs,
null);
if (cursor != null && cursor.movetofirst()) {
final int column_index = cursor.getcolumnindexorthrow(column);
return cursor.getstring(column_index);
}
} finally {
if (cursor != null)
cursor.close();
}
return null;
}
/**
* @param uri the uri to check.
* @return whether the uri authority is externalstorageprovider.
*/
public static boolean isexternalstoragedocument(uri uri) {
return "com.android.externalstorage.documents".equals(uri.getauthority());
}
/**
* @param uri the uri to check.
* @return whether the uri authority is downloadsprovider.
*/
public static boolean isdownloadsdocument(uri uri) {
return "com.android.providers.downloads.documents".equals(uri.getauthority());
}
/**
* @param uri the uri to check.
* @return whether the uri authority is mediaprovider.
*/
public static boolean ismediadocument(uri uri) {
return "com.android.providers.media.documents".equals(uri.getauthority());
}
}
绝对路径转uri比较简单
以绝对路径创建一个file对象，然后调用
uri.fromfile(file)
以上所述是小编给大家介绍的android uri和文件路径互相转换的实例代码，希望对大家有所帮助
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