具有拍攝意圖的Android FileProvider給出java.io.IOException：寫入失敗：EPIPE（管道損壞）

Question

我對新的FileProvider API有問題：

我有以下代碼從文件生成uri：

public Uri generateUri(String authority) {
            File storageDir = context.getExternalFilesDir(Environment.DIRECTORY_PICTURES);
            File imageFile = fileHelper.from(storageDir, PHOTO_NAME);

            if (!imageFile.exists() && !imageFile.createNewFile()) {
                throw new Exception("Can't create capture file");
            }
            Uri sharedUri = ExtendedFileProvider.getUriForFile(context, authority, imageFile);
            return sharedUri;
    }

URI是正確的，現在我像這樣打開相機意圖>

Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
            if (takePictureIntent.resolveActivity(context.getPackageManager()) != null) {
                takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, result);
                context.grantUriPermission(context.getPackageName(), result,
                        Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
                context.startActivityForResult(takePictureIntent, BaseActivity.SUBACTIVITY_TAKE_PHOTO);
            }

然后，打開相機，並在拍攝並確認照片后，我具有：

01-10 15:37:27.236 W/FastPrintWriter: Write failure
                                      java.io.IOException: write failed: EPIPE (Broken pipe)
                                          at libcore.io.IoBridge.write(IoBridge.java:501)
                                          at java.io.FileOutputStream.write(FileOutputStream.java:316)
                                          at com.android.internal.util.FastPrintWriter.flushBytesLocked(FastPrintWriter.java:336)
                                          at com.android.internal.util.FastPrintWriter.flushLocked(FastPrintWriter.java:359)
                                          at com.android.internal.util.FastPrintWriter.flush(FastPrintWriter.java:394)
                                          at android.view.ThreadedRenderer.dumpGfxInfo(ThreadedRenderer.java:613)
                                          at android.view.WindowManagerGlobal.dumpGfxInfo(WindowManagerGlobal.java:556)
                                          at android.app.ActivityThread$ApplicationThread.dumpGfxInfo(ActivityThread.java:1175)
                                          at android.app.ApplicationThreadNative.onTransact(ApplicationThreadNative.java:577)
                                          at android.os.Binder.execTransact(Binder.java:565)
                                       Caused by: android.system.ErrnoException: write failed: EPIPE (Broken pipe)
                                          at libcore.io.Posix.writeBytes(Native Method)
                                          at libcore.io.Posix.write(Posix.java:273)
                                          at libcore.io.BlockGuardOs.write(BlockGuardOs.java:319)
                                          at libcore.io.IoBridge.write(IoBridge.java:496)
                                          at java.io.FileOutputStream.write(FileOutputStream.java:316) 
                                          at com.android.internal.util.FastPrintWriter.flushBytesLocked(FastPrintWriter.java:336) 
                                          at com.android.internal.util.FastPrintWriter.flushLocked(FastPrintWriter.java:359) 
                                          at com.android.internal.util.FastPrintWriter.flush(FastPrintWriter.java:394) 
                                          at android.view.ThreadedRenderer.dumpGfxInfo(ThreadedRenderer.java:613) 
                                          at android.view.WindowManagerGlobal.dumpGfxInfo(WindowManagerGlobal.java:556) 
                                          at android.app.ActivityThread$ApplicationThread.dumpGfxInfo(ActivityThread.java:1175) 
                                          at android.app.ApplicationThreadNative.onTransact(ApplicationThreadNative.java:577) 
                                          at android.os.Binder.execTransact(Binder.java:565)

我已經完成了使用FileProvider所需的所有清單更改，並且一周前開始工作。

Answer 1

context.grantUriPermission(context.getPackageName(), result,
                    Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION);

該代碼顯示為“授予我自己的應用程序許可以使用我自己的應用程序的數據”。 這不是您想要的。 如果要使用grantUriPermission() ，則包名稱必須是您要向其授予許可的應用程序的名稱。

另外，在較新的API級別上還有更簡單的選項：

i.putExtra(MediaStore.EXTRA_OUTPUT, outputUri);

if (Build.VERSION.SDK_INT>=Build.VERSION_CODES.LOLLIPOP) {
  i.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
}
else if (Build.VERSION.SDK_INT>=Build.VERSION_CODES.JELLY_BEAN) {
  ClipData clip=
    ClipData.newUri(getContentResolver(), "A photo", outputUri);

  i.setClipData(clip);
  i.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
}
else {
  List<ResolveInfo> resInfoList=
    getPackageManager()
      .queryIntentActivities(i, PackageManager.MATCH_DEFAULT_ONLY);

  for (ResolveInfo resolveInfo : resInfoList) {
    String packageName = resolveInfo.activityInfo.packageName;
    grantUriPermission(packageName, outputUri,
      Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
  }
}

我在這：

• 如果應用程序運行在Android 5.0+上，則只需使用addFlags()

• 如果應用程序在Android 4.1-4.4上運行，請使用ClipData

• 在Android 4.0及更低版本上，迭代所有可能的相機應用程序並為它們中的每一個授予權限

在這篇博客文章中 ，我將更多地介紹該代碼段。