我有一些代码据称可以在Async类中查找以前选择的视频的路径。我搜索过SO并且所有解决方案都是相似的，如果不相同，但我获得的路径始终为null，当我打印它时，应用程序崩溃。
代码如下：
// The file location of the image selected.
Uri selectedVideo = uris[0];
String[] filePathColumn = { MediaStore.Video.Media.DATA };
Cursor cursor = getContentResolver().query(selectedVideo, filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
String filePath = cursor.getString(columnIndex);
Log.i("INFO", filePath);
cursor.close();
日志错误：
12-03 16:47:51.069 2644-2644/? E/MediaPlayer﹕ Should have subtitle controller already set
12-03 16:48:33.884 2644-2644/? E/MediaPlayer﹕ Should have subtitle controller already set
12-03 16:48:48.130 15711-31523/? E/JHEAD﹕ can't open '/0/file:///data/data/com.google.android.apps.plus/cache/media_sync/6/6aba39805abcb82-l'
12-03 16:48:48.140 15711-31523/? E/JHEAD﹕ can't open '/0/file:///data/data/com.google.android.apps.plus/cache/media_sync/f/f33ffcaf70cce9-l'
12-03 16:48:50.182 580-649/? E/ConnectivityService﹕ Unexpected mtu value: android.net.wifi.WifiStateTracker@42390b40
12-03 16:48:53.485 31630-31630/? E/PhoneMonitor﹕ onOtaspChanged old =0, new =3
12-03 16:48:58.581 176-31758/? E/AudioSink﹕ received unknown event type: 1 inside CallbackWrapper !
12-03 16:48:58.601 2644-2644/? E/MediaPlayer﹕ Should have subtitle controller already set
12-03 16:49:16.510 2644-2644/? E/SpannableStringBuilder﹕ SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-03 16:49:16.510 2644-2644/? E/SpannableStringBuilder﹕ SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-03 16:49:16.640 2644-2644/? E/SpannableStringBuilder﹕ SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-03 16:49:16.640 2644-2644/? E/SpannableStringBuilder﹕ SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-03 16:49:26.010 2644-2644/? E/MediaPlayer﹕ Should have subtitle controller already set
12-03 16:49:42.748 2644-2644/? E/MediaPlayer﹕ Should have subtitle controller already set
12-03 16:49:53.629 2644-2644/? E/MediaPlayer﹕ Should have subtitle controller already set
12-03 16:50:04.301 2644-2644/? E/MediaPlayer﹕ Should have subtitle controller already set
12-03 16:50:19.137 2644-2644/? E/SpannableStringBuilder﹕ SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-03 16:50:19.137 2644-2644/? E/SpannableStringBuilder﹕ SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-03 16:50:21.319 2644-2644/? E/SpannableStringBuilder﹕ SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-03 16:50:21.319 2644-2644/? E/SpannableStringBuilder﹕ SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-03 16:50:21.970 2644-2644/? E/SpannableStringBuilder﹕ SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-03 16:50:21.970 2644-2644/? E/SpannableStringBuilder﹕ SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-03 16:50:25.233 2644-2644/? E/SpannableStringBuilder﹕ SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-03 16:50:25.233 2644-2644/? E/SpannableStringBuilder﹕ SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-03 16:50:28.997 2644-2644/? E/MediaPlayer﹕ Should have subtitle controller already set
12-03 16:50:38.718 2644-2644/? E/MediaPlayer﹕ Should have subtitle controller already set
12-03 16:50:47.627 2644-2644/? E/MediaPlayer﹕ Should have subtitle controller already set
12-03 16:50:53.473 2644-2644/? E/MediaPlayer﹕ Should have subtitle controller already set
12-03 16:51:07.108 2644-2644/? E/MediaPlayer﹕ Should have subtitle controller already set
12-03 16:51:18.110 2644-2644/? E/SpannableStringBuilder﹕ SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-03 16:51:18.110 2644-2644/? E/SpannableStringBuilder﹕ SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-03 16:51:18.500 2644-2644/? E/SpannableStringBuilder﹕ SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-03 16:51:18.500 2644-2644/? E/SpannableStringBuilder﹕ SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-03 16:51:22.054 2644-2644/? E/MediaPlayer﹕ Should have subtitle controller already set
12-03 16:51:40.073 2644-2644/? E/MediaPlayer﹕ Should have subtitle controller already set
12-03 16:51:47.761 2644-2644/? E/SpannableStringBuilder﹕ SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-03 16:51:47.761 2644-2644/? E/SpannableStringBuilder﹕ SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-03 16:51:48.282 2644-2644/? E/SpannableStringBuilder﹕ SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-03 16:51:48.282 2644-2644/? E/SpannableStringBuilder﹕ SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-03 16:51:50.824 2644-2644/? E/MediaPlayer﹕ Should have subtitle controller already set
12-03 16:52:13.869 2644-2644/? E/MediaPlayer﹕ Should have subtitle controller already set
12-03 16:52:17.243 2644-2644/? E/MediaPlayer﹕ Should have subtitle controller already set
12-03 16:52:29.576 2644-2644/? E/SpannableStringBuilder﹕ SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-03 16:52:29.576 2644-2644/? E/SpannableStringBuilder﹕ SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-03 16:52:29.736 2644-2644/? E/SpannableStringBuilder﹕ SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-03 16:52:29.736 2644-2644/? E/SpannableStringBuilder﹕ SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-03 16:52:29.956 2644-2644/? E/SpannableStringBuilder﹕ SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-03 16:52:29.956 2644-2644/? E/SpannableStringBuilder﹕ SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-03 16:52:30.206 2644-2644/? E/SpannableStringBuilder﹕ SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-03 16:52:30.206 2644-2644/? E/SpannableStringBuilder﹕ SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-03 16:54:45.391 2644-2644/? E/SpannableStringBuilder﹕ SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-03 16:54:45.391 2644-2644/? E/SpannableStringBuilder﹕ SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-03 16:54:45.681 2644-2644/? E/SpannableStringBuilder﹕ SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-03 16:54:45.681 2644-2644/? E/SpannableStringBuilder﹕ SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-03 16:54:45.711 2644-2644/? E/MediaPlayer﹕ Should have subtitle controller already set
12-03 16:54:53.630 2644-2644/? E/MediaPlayer﹕ Should have subtitle controller already set
12-03 16:55:03.260 2644-2644/? E/MediaPlayer﹕ Should have subtitle controller already set
12-03 16:55:23.351 2644-2644/? E/SpannableStringBuilder﹕ SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-03 16:55:23.351 2644-2644/? E/SpannableStringBuilder﹕ SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-03 16:55:25.373 2644-2644/? E/MediaPlayer﹕ Should have subtitle controller already set
12-03 16:55:39.408 2644-2644/? E/MediaPlayer﹕ Should have subtitle controller already set
12-03 16:55:41.240 2644-2644/? E/MediaPlayer﹕ Should have subtitle controller already set
12-03 16:57:47.005 32440-32440/? E/dalvikvm﹕ Could not find class 'com.google.trix.ritz.shared.messages.b', referenced from method bgi.<init>
12-03 16:57:47.005 32440-32440/? E/dalvikvm﹕ Could not find class 'com.google.trix.ritz.shared.render.g', referenced from method bgi.<init>
12-03 16:57:47.015 32440-32440/? E/dalvikvm﹕ Could not find class 'com.google.trix.ritz.shared.behavior.validation.a', referenced from method bgi.<init>
12-03 16:57:47.015 32440-32440/? E/dalvikvm﹕ Could not find class 'com.google.trix.ritz.shared.mutation.N', referenced from method bgi.<init>
12-03 16:57:48.226 32521-32521/? E/MY KEY HASH:﹕ PaXGYdYcmTsLk5ibvJIlKJeOkQ8=
12-03 16:57:51.559 32470-32605/com.amazonaws.demo.s3uploader E/AndroidRuntime﹕ FATAL EXCEPTION: AsyncTask #1
Process: com.amazonaws.demo.s3uploader, PID: 32470
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:300)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:841)
Caused by: java.lang.NullPointerException: println needs a message
at android.util.Log.println_native(Native Method)
at android.util.Log.i(Log.java:160)
at com.amazonaws.demo.s3uploader.S3UploaderActivity$S3PutObjectTask.doInBackground(S3UploaderActivity.java:155)
at com.amazonaws.demo.s3uploader.S3UploaderActivity$S3PutObjectTask.doInBackground(S3UploaderActivity.java:123)
at android.os.AsyncTask$2.call(AsyncTask.java:288)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:841)
12-03 16:57:52.060 32470-32470/com.amazonaws.demo.s3uploader E/WindowManager﹕ android.view.WindowLeaked: Activity com.amazonaws.demo.s3uploader.S3UploaderActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{41ff97f8 V.E..... R.....ID 0,0-357,230} that was originally added here
at android.view.ViewRootImpl.<init>(ViewRootImpl.java:346)
at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:248)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
at android.app.Dialog.show(Dialog.java:286)
at com.amazonaws.demo.s3uploader.S3UploaderActivity$S3PutObjectTask.onPreExecute(S3UploaderActivity.java:131)
at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:587)
at android.os.AsyncTask.execute(AsyncTask.java:535)
at com.amazonaws.demo.s3uploader.S3UploaderActivity.onActivityResult(S3UploaderActivity.java:79)
at android.app.Activity.dispatchActivityResult(Activity.java:5435)
at android.app.ActivityThread.deliverResults(ActivityThread.java:3342)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:3389)
at android.app.ActivityThread.access$1200(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1445)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4998)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593)
at dalvik.system.NativeStart.main(Native Method)
我错过了什么？
答案 0 :(得分：3)
修改：
我确信您的代码可以在4.3及更低版本上运行，但KitKat有一些变化。希望这些主题能够提供帮助：
Get real path from URI, Android KitKat new storage access framework
Android Gallery on KitKat returns different Uri for Intent.ACTION_GET_CONTENT
您的代码看起来是正确的。尝试：
String[] filePathColumn = { MediaStore.Video.VideoColumns.Data };
并且，也许，您应该更改您的查询：
Cursor cursor = getContentResolver().query(selectedVideo, null, null, null, null);
最后，你的URI是什么？它可能是Dropbox或其他类似的本地文件路径。