java.io.FileNotFoundException: 没有那个文件或目录

Question

我已经读取片段中光标处的所有图像文件并首先传输 activity 有任何问题但是当跳转另一个 activity 相同的文件路径时没有读取虽然文件已经存在。

片段设置所有媒体数据并首先传输activity。第一个 activity 正在查看所有媒体文件的现有状态和所有文件 return true 但如果第一个 activity 传输这些文件，第二个 activity 不读取相同的文件并且在调用时文件操作（BitmapFactory.decodeFile）抛出 FileNotFoundException。

isFile()功能只提供检查是否有文件。

媒体模型：

public Media(Uri uri, String path){
  this.uri = uri;
  this.path = path;
}

MyFragment.java:

private final LinkedList<Media> mediasList;

void setMediasListAndStartFirstActivity(){

  while (cursor != null && cursor.moveToNext()) {

    Uri uri = Uri.withAppendedPath(contentUri, cursor.getString(cursor.getColumnIndexOrThrow(Images.Media._ID)));
    String path = cursor.getString(cursor.getColumnIndexOrThrow(Images.Media.DATA));  
    mediasList.add(new Media(uri, path));
  }

Intent i = new Intent(requireActivity(), FirstActivity.class);
i.putExtra("mediasList", mediasList);
startActivity(i);      
}

FirstActivity.java:

Bundle extras = getIntent().getExtras();
mediasList = (ArrayList<Media>) getIntent().getExtras().get("mediasList");

for(Media media : mediasList)
 boolean hasMedia = new File(media.getPath()).isFile(); // --> all medias return true

void transferAllMediasToSecondActivity(){
 Intent i = new Intent(FirstActivity.this, SecondActivity.class);
 i.putExtra("mediasList", mediasList);
 startActivity(i);
}

SecondActivity.java

Bundle extras = getIntent().getExtras();
mediasList = (ArrayList<Media>) getIntent().getExtras().get("mediasList");

for(int i = mediasList.size; i <= 0; i--)
 {
    Media media = mediasList.get(i);
    File mediaFile = new File(media.getPath());
    boolean hasMedia = mediaFile.isFile(); // --> all medias return false. All medias are not reading

    // -> throw FileNotFound exception call this function 
    BitmapFactory.decodeFile(mediaFile.getAbsolutePath(), new BitmapFactory.Options()); 
}

我现有的媒体第一路径：

/storage/emulated/0/DCIM/Screenshots/Screenshot_20190712-123350.jpg
at MyFragment new File(media.getPath()).isFile() : true
at FirstActivity new File(media.getPath()).isFile() : true
at SecondActivity new File(media.getPath()).isFile() : false and decodeFile function throw FileNotFoundException

异常：

Unable to decode stream: java.io.FileNotFoundException: /storage/emulated/0/MyApp/MyAppImage/IMAGE20190711_182337871.jpg(No such file or directory)

FirstFragment mediasList 日志：

media[0] : com.android.android.conversation.attachment.gallery.model.Media@2ee333c9 media[1] : com.android.android.conversation.attachment.gallery.model.Media@2ee333b1 media[2]: com.android.android.conversation.attachment.gallery.model.Media@2ee333b0

media[0].getPath() : /storage/emulated/0/MyApp/MyAppImage/IMAGE20190711_182337871.jpg media[1].getPath() : /storage/emulated/0/MyApp/MyAppImage/IMAGE20190711_182334910.jpg media[2].getPath() : /storage/emulated/0/MyApp/MyAppImage/IMAGE20190716_170439762.jpg

FirstActivity 和 SecondActivity mediasList 日志：

media[0] : com.android.android.conversation.attachment.gallery.model.Media@2ee333c9 media[1] : com.android.android.conversation.attachment.gallery.model.Media@2ee333b1

media[0].getPath() : /storage/emulated/0/MyApp/MyAppImage/IMAGE20190711_182337871.jpg media[1].getPath() : /storage/emulated/0/MyApp/MyAppImage/IMAGE20190711_182334910.jpg

Answer 1

尝试更改从以下片段获取路径的方式：

while (cursor != null && cursor.moveToNext()) {

    Uri uri = Uri.withAppendedPath(contentUri, cursor.getString(cursor.getColumnIndexOrThrow(Images.Media._ID)));
    String path = cursor.getString(cursor.getColumnIndexOrThrow(Images.Media.DATA));  
    mediasList.add(new Media(uri, path));
}

至

while (cursor != null && cursor.moveToNext()) {

    Uri uri = Uri.withAppendedPath(contentUri, cursor.getString(cursor.getColumnIndexOrThrow(Images.Media._ID)));
    String path = uri.getPath();  
    mediasList.add(new Media(uri, path));
}

Answer 2

我注意到我的可打包媒体没有到处打包。

我找到了这个解决方案：

  Bundle b = new Bundle();
  b.putParcelableArrayList(KEY_MEDIA, medias);
  intent.putExtra("bundle", b);

  Bundle b = getIntent().getBundleExtra("bundle");
  sendMediasList = b.getParcelableArrayList(KEY_MEDIA);

我用过这个，效果很好。非常非常感谢您的努力@John Joe 和@Frandall

java.io.FileNotFoundException: 没有那个文件或目录

java.io.FileNotFoundException: No such file or directory

android

file

filenotfoundexception