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为什么它不起作用? 编辑:增加了新的代码版本&日志:如何通过Uri复制JPG文件
private void savePhotoFromCacheToFolder(Uri uri) {
File goodPhoto = album.setUpPhotoFile(); //new empty JPG
File currentPhoto = new File(uri.getPath()); //JPG from camera in cache
Log.v(TAG, "\ngoodPhoto Path " + goodPhoto);
Log.v(TAG, "\ncurrentPhoto Path " + currentPhoto);
FileInputStream source = null;
FileOutputStream destination = null;
try {
source = new FileInputStream(currentPhoto);
} catch (FileNotFoundException e) {
e.printStackTrace();
Log.v(TAG, "\ncurrentPhoto not found ");
}
try {
destination = new FileOutputStream(goodPhoto);
} catch (FileNotFoundException e) {
e.printStackTrace();
Log.v(TAG, "\ngoodPhoto not found ");
}
FileChannel sourceFileChannel = source.getChannel();
FileChannel destinationFileChannel = destination.getChannel();
long size = 0;
try {
size = sourceFileChannel.size();
sourceFileChannel.transferTo(0, size, destinationFileChannel);
} catch (IOException e) {
e.printStackTrace();
Log.v(TAG, "\nshit happens ");
}
}
日志:
V/MainActivity: goodPhoto Path /storage/emulated/0/Pictures/Good photos/IMG_20170222_113700_-913025224.jpg
V/MainActivity: currentPhoto Path /cache/photo.jpg
V/MainActivity: currentPhoto not found
java.lang.NullPointerException: Attempt to invoke virtual method 'java.nio.channels.FileChannel java.io.FileInputStream.getChannel()' on a null object reference
它看起来像URI是不正确的,但此URI被相机应用程序返回。或者,也许我无法访问缓存文件夹,但之前我使用此Uri做了预览照片。
在catch中添加一些日志,你会看到发生了什么 – Selvin
捕获异常并忽略它是非常糟糕的。 –
@Selvin我们需要知道什么? – Nikita