{"id":1295,"date":"2023-03-18T10:25:35","date_gmt":"2023-03-18T02:25:35","guid":{"rendered":"https:\/\/www.appblog.cn\/?p=1295"},"modified":"2023-04-29T09:18:19","modified_gmt":"2023-04-29T01:18:19","slug":"android-10-api-29-new-feature-adaptation-partitioned-storage","status":"publish","type":"post","link":"https:\/\/www.appblog.cn\/index.php\/2023\/03\/18\/android-10-api-29-new-feature-adaptation-partitioned-storage\/","title":{"rendered":"Android 10(Api 29)\u65b0\u7279\u6027\u9002\u914d &#8211; \u5206\u533a\u5b58\u50a8"},"content":{"rendered":"<p>\u5b98\u65b9\u6587\u6863\uff1a<a target=\"_blank\" rel=\"noopener\" href=\"https:\/\/developer.android.google.cn\/preview\/privacy\/scoped-storage\">https:\/\/developer.android.google.cn\/preview\/privacy\/scoped-storage<\/a><\/p>\n<h2>\u95ee\u9898\u63cf\u8ff0<\/h2>\n<p>\u4eceAndroid 10\u5f00\u59cb\u5e94\u7528\u5c06\u4e0d\u53ef\u76f4\u63a5\u8bbf\u95ee\u5916\u90e8\u5b58\u50a8\uff08<code>\/sdcard<\/code>\uff09\u6587\u4ef6\uff0c\u5426\u5219\u629b\u5f02\u5e38\u3002<\/p>\n<p><!-- more --><\/p>\n<p>\u5728AndroidQ\u4e0a\u8fd0\u884c\uff1a<\/p>\n<ul>\n<li><code>targetSdkVersion&lt;Q<\/code>\uff0c\u6ca1\u5f71\u54cd\uff1b<\/li>\n<li><code>targetSdkVersion&gt;=Q<\/code>\uff0c\u9ed8\u8ba4\u542f\u7528\u8fc7\u6ee4\u89c6\u56fe\uff0c\u5e94\u7528\u4ee5\u5916\u7684\u6587\u4ef6\u9700\u8981\u901a\u8fc7<a target=\"_blank\" rel=\"noopener\" href=\"http:\/\/https:\/\/developer.android.google.cn\/guide\/topics\/providers\/document-provider\" title=\"\u5b58\u50a8\u8bbf\u95ee\u6846\u67b6\">\u5b58\u50a8\u8bbf\u95ee\u6846\u67b6<\/a>\uff08<code>SAF<\/code>\uff0c<code>StorageAccessFramework<\/code>\uff09\u8bfb\u5199\u3002<\/li>\n<\/ul>\n<h2>\u89e3\u51b3\u65b9\u6cd5<\/h2>\n<h3>\u505c\u7528\u8fc7\u6ee4\u89c6\u56fe\uff0c\u4f7f\u7528\u65e7\u7248\u5b58\u50a8\u6a21\u5f0f<\/h3>\n<pre><code class=\"language-xml\">&lt;manifest ... &gt;\n    &lt;!-- This attribute is &quot;false&quot; by default on apps targeting Android Q. --&gt;\n    &lt;application android:requestLegacyExternalStorage=&quot;true&quot; ... &gt;\n       ...\n    &lt;\/application&gt;\n&lt;\/manifest&gt;<\/code><\/pre>\n<h3>\u5c06\u6587\u4ef6\u5b58\u50a8\u5230\u8fc7\u6ee4\u89c6\u56fe\u4e2d\uff0c\u5b98\u65b9\u63a8\u8350\u3002<\/h3>\n<pre><code class=\"language-java\">\/\/ \/Android\/data\/com.example.androidq\/files\/Documents\nFile dir = context.getExternalFilesDir(Environment.DIRECTORY_DOCUMENTS);<\/code><\/pre>\n<ul>\n<li>\u4f18\u70b9\uff1a\u4e0d\u7528\u7533\u8bf7\u8bfb\u5199\u6743\u9650<\/li>\n<li>\u7f3a\u70b9\uff1a\u968f\u5e94\u7528\u5378\u8f7d\u800c\u5220\u9664<\/li>\n<\/ul>\n<h3>\u4f7f\u7528\u5b58\u50a8\u8bbf\u95ee\u6846\u67b6\uff08SAF\uff09\uff0c\u7531\u7528\u6237\u6307\u5b9a\u8981\u8bfb\u5199\u7684\u6587\u4ef6\u3002<\/h3>\n<p>\u6b64\u529f\u80fdAndroid 4.4\uff08API: 19\uff09\u5c31\u6709\uff0c\u5b98\u65b9\u6587\u6863\uff1a<a target=\"_blank\" rel=\"noopener\" href=\"https:\/\/developer.android.google.cn\/guide\/topics\/providers\/document-provider\">https:\/\/developer.android.google.cn\/guide\/topics\/providers\/document-provider<\/a><\/p>\n<h3>\u83b7\u53d6\u7528\u6237\u6307\u5b9a\u7684\u67d0\u4e2a\u76ee\u5f55\u7684\u8bfb\u5199\u6743\u9650<\/h3>\n<p>\u4eceAndroid 5.0\uff08Api 21\uff09\u5f00\u59cb\u5c31\u6709\uff0c\u5b98\u65b9\u6587\u6863\uff1a<a target=\"_blank\" rel=\"noopener\" href=\"https:\/\/developer.android.google.cn\/about\/versions\/android-5.0#Storage\">https:\/\/developer.android.google.cn\/about\/versions\/android-5.0#Storage<\/a><\/p>\n<h4>\u7533\u8bf7\u76ee\u5f55\u7684\u8bbf\u95ee\u6743\u9650<\/h4>\n<p>\u4f1a\u6253\u5f00\u7cfb\u7edf\u7684\u6587\u4ef6\u76ee\u5f55\uff0c\u7531\u7528\u6237\u81ea\u5df1\u9009\u62e9\u5141\u8bb8\u8bbf\u95ee\u7684\u76ee\u5f55\uff0c\u4e0d\u7528\u7533\u8bf7<code>WRITE\/READ_EXTERNAL_STORAGE<\/code>\u6743\u9650\u3002<\/p>\n<pre><code class=\"language-java\">Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT_TREE);\nintent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION | \n        Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION);                \nstartActivityForResult(intent, REQ_CODE);<\/code><\/pre>\n<p>\u6267\u884c\u4e0a\u8ff0\u4ee3\u7801\u540e\u4f1a\u51fa\u73b0\u7c7b\u4f3c\u5982\u4e0b\u56fe\u754c\u9762\uff0c\u70b9\u51fb\u2018\u5141\u8bb8\u8bbf\u95ee\u201cDuoKan\u201d\u2019\u6309\u94ae<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/www.yezhou.me\/AppBlog\/images\/Android\/Uri\u8bfb\u5199\u6587\u4ef6\u8be2\u95ee\u6846.png\" alt=\"Uri\u8bfb\u5199\u6587\u4ef6\u8be2\u95ee\u6846\" \/><\/p>\n<p>\u5141\u8bb8\u4e4b\u540e\u901a\u8fc7<code>onActivityResult()<\/code>\u7684<code>intent.getData()<\/code>\u5f97\u5230\u8be5\u76ee\u5f55\u7684Uri\uff0c\u901a\u8fc7Uri\u53ef\u83b7\u53d6\u5b50\u76ee\u5f55\u548c\u6587\u4ef6\u3002\u8fd9\u79cd\u65b9\u5f0f\u7684\u7f3a\u70b9\u662f\u5e94\u7528\u91cd\u88c5\u540e\u6743\u9650\u5931\u6548\uff0c\u5373\u4f7f\u4fdd\u5b58\u8fd9\u4e2aUri\u4e5f\u6ca1\u7528\u3002<\/p>\n<pre><code class=\"language-java\">Uri dirUri = intent.getData();\n\/\/ \u6301\u4e45\u5316\uff1b\u5e94\u7528\u91cd\u88c5\u540e\u6743\u9650\u5931\u6548\uff0c\u5373\u4f7f\u77e5\u9053\u8fd9\u4e2auri\u4e5f\u6ca1\u7528\nSPUtil.setValue(this, SP_DOC_KEY, dirUri.toString());\n\/\/\u91cd\u8981\uff1a\u5c11\u8fd9\u884c\u4ee3\u7801\u624b\u673a\u91cd\u542f\u540e\u4f1a\u5931\u53bb\u6743\u9650\ngetContentResolver().takePersistableUriPermission(dirUri, \n        Intent.FLAG_GRANT_READ_URI_PERMISSION);<\/code><\/pre>\n<h4>\u901a\u8fc7Uri\u8bfb\u5199\u6587\u4ef6<\/h4>\n<p>\uff081\uff09\u521b\u5efa\u6587\u4ef6<\/p>\n<pre><code class=\"language-java\">\/\/ \u5728mUri\u76ee\u5f55\uff08\u2018DuoKan\u2019\u76ee\u5f55\uff09\u4e0b\u521b\u5efa&#039;test.txt&#039;\u6587\u4ef6\nprivate void createFile() {\n    DocumentFile documentFile = DocumentFile.fromTreeUri(this, mUri);\n    DocumentFile file = documentFile.createFile(&quot;text\/plain&quot;, &quot;test.txt&quot;);\n    if (file != null &amp;&amp; file.exists()) {\n        LogUtil.log(file.getName() + &quot; created&quot;);\n    }\n}<\/code><\/pre>\n<p>\u4e3b\u8981\u7528\u5230DocumentFile\u7c7b\uff0c\u548cFile\u7c7b\u7684\u65b9\u6cd5\u7c7b\u4f3c\uff0c\u6709<code>isFile<\/code>\u3001<code>isDirectory<\/code>\u3001<code>exists<\/code>\u3001<code>listFiles<\/code>\u7b49\u65b9\u6cd5<\/p>\n<p>\uff082\uff09\u5220\u9664\u6587\u4ef6<\/p>\n<pre><code class=\"language-java\">\/\/\u5220\u9664&quot;test.txt&quot;\nprivate void deleteFile() {\n    DocumentFile documentFile = DocumentFile.fromTreeUri(this, mUri);\n    \/\/ listFiles()\uff0c\u5217\u51fa\u6240\u6709\u7684\u5b50\u6587\u4ef6\u548c\u6587\u4ef6\u5939\n    for (DocumentFile file : documentFile.listFiles()) {\n        if (file.isFile() &amp;&amp; &quot;test.txt&quot;.equals(file.getName())) {\n            boolean delete = file.delete();\n            LogUtil.log(&quot;deleteFile: &quot; + delete);\n            break;\n        }\n    }\n}<\/code><\/pre>\n<p>\uff083\uff09\u5199\u5165\u6570\u636e<\/p>\n<pre><code class=\"language-java\">private void writeFile(Uri uri) {\n    try {\n        ParcelFileDescriptor pfd = getContentResolver().openFileDescriptor(uri, &quot;w&quot;);\n        \/\/\u8fd9\u79cd\u65b9\u6cd5\u4f1a\u8986\u76d6\u539f\u6765\u6587\u4ef6\u5185\u5bb9\n        OutputStreamWriter output = \n                new OutputStreamWriter(new FileOutputStream(pfd.getFileDescriptor()));\n        \/\/ \u4e0d\u80fd\u4f20uri.toString(),\u5426\u5219FileNotFoundException\n        \/\/ OutputStreamWriter output = new OutputStreamWriter(new FileOutputStream(uri.toString(), true));\n        output.write(&quot;\u8fd9\u662f\u4e00\u6bb5\u6587\u4ef6\u5199\u5165\u6d4b\u8bd5\\n&quot;);\n        output.close();\n        LogUtil.log(&quot;\u5199\u5165\u6210\u529f\u3002&quot;);\n    } catch (IOException e) {\n        LogUtil.log(e);\n    }\n}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u5b98\u65b9\u6587\u6863\uff1ahttps:\/\/developer.android.google.cn\/preview\/privac [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[325],"tags":[],"class_list":["post-1295","post","type-post","status-publish","format-standard","hentry","category-android-adaptation"],"_links":{"self":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts\/1295","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/comments?post=1295"}],"version-history":[{"count":0,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts\/1295\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/media?parent=1295"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/categories?post=1295"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/tags?post=1295"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}