android–FileNotFoundException将文件写入SD卡

概述我正在尝试从网上下载文件并将其写入SD卡.我启用了WRITE_EXTERNAL_STORAGE权限.代码在这里失败：OutputStreamoutput=newFileOutputStream(filePath);09-1519:40:31.630:WARN/System.err(7933):java.io.FileNotFoundException:/sdcard/artoo/Customerv08.apk09-1519:40

我正在尝试从网上下载文件并将其写入SD卡.我启用了WRITE_EXTERNAL_STORAGE权限.代码在这里失败：

OutputStream output = new fileOutputStream(filePath);09-15 19:40:31.630: WARN/System.err(7933): java.io.fileNotFoundException: /sdcard/artoo/Customerv08.apk09-15 19:40:31.630: WARN/System.err(7933):     at org.apache.harmony.luni.platform.OSfileSystem.open(OSfileSystem.java:231)09-15 19:40:31.630: WARN/System.err(7933):     at java.io.fileOutputStream.<init>(fileOutputStream.java:96)09-15 19:40:31.630: WARN/System.err(7933):     at java.io.fileOutputStream.<init>(fileOutputStream.java:169)09-15 19:40:31.630: WARN/System.err(7933):     at java.io.fileOutputStream.<init>(fileOutputStream.java:147)09-15 19:40:31.640: WARN/System.err(7933):     at com.artoo.settings.InstallerActivity$ProgressDialogAsyncTask.doInBackground(InstallerActivity.java:148)09-15 19:40:31.640: WARN/System.err(7933):     at com.artoo.settings.InstallerActivity$ProgressDialogAsyncTask.doInBackground(InstallerActivity.java:1)09-15 19:40:31.640: WARN/System.err(7933):     at androID.os.AsyncTask.call(AsyncTask.java:185)09-15 19:40:31.640: WARN/System.err(7933):     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:256)09-15 19:40:31.640: WARN/System.err(7933):     at java.util.concurrent.FutureTask.run(FutureTask.java:122)09-15 19:40:31.640: WARN/System.err(7933):     at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:648)09-15 19:40:31.640: WARN/System.err(7933):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:673)09-15 19:40:31.651: WARN/System.err(7933):     at java.lang.Thread.run(Thread.java:1060)09-15 19:40:31.670: WARN/inputManagerService(53): Window already focused, ignoring focus gain of: com.androID.internal.vIEw.IinputMethodClIEnt$Stub$Proxy@43868480

我正在尝试编写该文件,它从以前不存在.关于如何做到这一点的任何想法？

解决方法:

您收到该错误,因为指定的文件无法打开或不存在.这很简单.

我总是先创建一个文件并使用bufferedstream写入它,例如：

file file = new file(path, name);file.createNewfile();bufferedoutputstream out = new bufferedoutputstream(new fileOutputStream(file), BUFFER);

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