Android保存文件权限被拒绝

Question

I would like to write a Bitmap Object on file. This is my code:

File f = new File(path + "-bw.jpg");
OutputStream fileStream = new BufferedOutputStream(new FileOutputStream(path + "-bw.jpg"));
image.getBitmap().compress(Bitmap.CompressFormat.JPEG, 100, fileStream);
fileStream.close();

The following is the stacktrace:

1-11 09:56:05.553: D/dalvikvm(277): GC_EXTERNAL_ALLOC freed 385 objects / 15832 bytes in 69ms
11-11 09:56:05.733: D/dalvikvm(277): GC_EXTERNAL_ALLOC freed 32 objects / 34048 bytes in 51ms
11-11 09:56:05.923: E/Save error(277): /mnt/sdcard/Water lilies-bw.jpg (Permission denied)
11-11 09:56:05.923: E/Save error(277): java.io.FileNotFoundException: /mnt/sdcard/Water lilies-bw.jpg (Permission denied)
11-11 09:56:05.923: E/Save error(277):  at org.apache.harmony.luni.platform.OSFileSystem.openImpl(Native Method)
11-11 09:56:05.923: E/Save error(277):  at org.apache.harmony.luni.platform.OSFileSystem.open(OSFileSystem.java:152)
11-11 09:56:05.923: E/Save error(277):  at java.io.FileOutputStream.<init>(FileOutputStream.java:97)
11-11 09:56:05.923: E/Save error(277):  at java.io.FileOutputStream.<init>(FileOutputStream.java:168)
11-11 09:56:05.923: E/Save error(277):  at java.io.FileOutputStream.<init>(FileOutputStream.java:147)
11-11 09:56:05.923: E/Save error(277):  at it.bwpp.activity.ConvertPictureActivity.convertImage(ConvertPictureActivity.java:75)
11-11 09:56:05.923: E/Save error(277):  at it.bwpp.activity.ConvertPictureActivity.access$6(ConvertPictureActivity.java:68)
11-11 09:56:05.923: E/Save error(277):  at it.bwpp.activity.ConvertPictureActivity$1.onClick(ConvertPictureActivity.java:58)
11-11 09:56:05.923: E/Save error(277):  at android.view.View.performClick(View.java:2408)
11-11 09:56:05.923: E/Save error(277):  at android.view.View$PerformClick.run(View.java:8816)
11-11 09:56:05.923: E/Save error(277):  at android.os.Handler.handleCallback(Handler.java:587)
11-11 09:56:05.923: E/Save error(277):  at android.os.Handler.dispatchMessage(Handler.java:92)
11-11 09:56:05.923: E/Save error(277):  at android.os.Looper.loop(Looper.java:123)
11-11 09:56:05.923: E/Save error(277):  at android.app.ActivityThread.main(ActivityThread.java:4627)
11-11 09:56:05.923: E/Save error(277):  at java.lang.reflect.Method.invokeNative(Native Method)
11-11 09:56:05.923: E/Save error(277):  at java.lang.reflect.Method.invoke(Method.java:521)
11-11 09:56:05.923: E/Save error(277):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
11-11 09:56:05.923: E/Save error(277):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
11-11 09:56:05.923: E/Save error(277):  at dalvik.system.NativeStart.main(Native Method)
11-11 09:56:05.923: I/save image(277): End save image...

Where is the error? Thanks!

Answer 1

我认为您忘记向您的 AnroidManifest.xml 添加android.permission.WRITE_EXTERNAL_STORAGE权限。

Answer 2

It's a 10-year-old question. Things have changed since then.

Declaring permissions in the manifest file is not enough now. you need to request permissions at runtime.

Even following permission is obsolete now.

android.permission.WRITE_EXTERNAL_STORAGE

Refer to full documentation here.