Android问题集锦之三十八：not allowed to send broadcast android.intent.action.MEDIA_MOUNTED

最新推荐文章于 2024-03-04 19:47:13 发布

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最新推荐文章于 2024-03-04 19:47:13 发布

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文章详细介绍了在Android 4.4及以上版本中，由于系统权限提高导致无法通过发送广播来通知系统重新挂载SD卡的问题，并提供了解决方案：使用ACTION_MEDIA_SCANNER_SCAN_FILE意图来通知系统重新扫描文件。

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当我们保存图片后就会发个通知告诉系统让sdcard重新挂载，这样其他程序就会立即找到这张图片。

<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">            Intent intent = new Intent()<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
            intent<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.setAction</span>(Intent<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.ACTION</span>_MEDIA_MOUNTED)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
            intent<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.setData</span>(Uri<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.fromFile</span>(Environment
                    <span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.getExternalStorageDirectory</span>()))<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
            sendBroadcast(intent)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li></ul>

但是到了Android4.4就不灵了，Google将MEDIA_MOUNTED的权限提高了，于是就报了一个下面的错误。

<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">W/System<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.err</span>﹕java<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.lang</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.SecurityException</span>: Permission Denial: not allowed to send broadcast android<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.intent</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.action</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.MEDIA</span>_MOUNTED from pid=<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">18338</span>, uid=<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">10087</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul>

在stackoverfollow中找到了一个办法，在高版本中使用ACTION_MEDIA_SCANNER_SCAN_FILE去通知系统重新扫描文件。代码如下：

<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">                if (Build<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.VERSION</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.SDK</span>_INT >= Build<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.VERSION</span>_CODES<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.KITKAT</span>) {
                    Intent mediaScanIntent = new Intent(
                            Intent<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.ACTION</span>_MEDIA_SCANNER_SCAN_FILE)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
                    Uri contentUri = Uri<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.fromFile</span>(mPhotoFile)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">; //out is your output file</span>
                    mediaScanIntent<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.setData</span>(contentUri)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
                    CameraActivity<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.this</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.sendBroadcast</span>(mediaScanIntent)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
                } else {
                    sendBroadcast(new Intent(
                            Intent<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.ACTION</span>_MEDIA_MOUNTED,
                            Uri<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.parse</span>(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"file://"</span>
                                    + Environment<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.getExternalStorageDirectory</span>())))<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
                }
            } catch (FileNotFoundException e) {
                Log<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.d</span>(TAG, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"File not found: "</span> + e<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.getMessage</span>())<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
            } catch (IOException e) {
                Log<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.d</span>(TAG, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Error accessing file: "</span> + e<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.ge</span></code>

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from:http://blog.youkuaiyun.com/lincyang/article/details/45766479