在我的应用程序中,您拍摄一张照片将其保存到 SD 卡,然后用户可以选择如何处理它。删除、保存或发送。如果按删除。我称它为File.delete()
在我去画廊查看文件时删除文件,然后当我有时回去时,我看到一个黑色图像,说文件无法加载。该图像是我之前尝试删除的图像。这有什么问题,为什么它没有完全消失?
我如何保存图像:
public static File getOutputMediaFile(byte[] data){
image= BitmapFactory.decodeByteArray(data, 0, data.length);
File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), "FrontFlash");
// Create the storage directory if it does not exist
if (!mediaStorageDir.exists()){
if (!mediaStorageDir.mkdirs()) return null;
}
// Create a media file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
File mediaFile;
mediaFile = new File(mediaStorageDir.getPath() + File.separator + "IMG_" + timeStamp + ".jpg");
return mediaFile;
}
@Override
public void onPictureTaken(byte[] data, Camera camera){
pictureFile = Util.getOutputMediaFile(data);
if (pictureFile == null){
Toast.makeText(this, "Couldn't create file", Toast.LENGTH_SHORT).show();
}
else{
try{
FileOutputStream fos = new FileOutputStream(pictureFile);
fos.write(data);
fos.close();
}
catch (FileNotFoundException e){
Toast.makeText(this, "File not found exception", Toast.LENGTH_SHORT).show();
}
catch (IOException e){
Toast.makeText(this, "IO Exception", Toast.LENGTH_SHORT).show();
}
}
sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://" + new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), "FrontCam"))));
String photopath = pictureFile.getPath().toString();
//旋转图片
bmp = BitmapFactory.decodeFile(photopath);
matrix = new Matrix();
matrix.postRotate(270);
bmp = Bitmap.createBitmap(bmp, 0, 0, bmp.getWidth(), bmp.getHeight(), matrix, true);
FileOutputStream fOut;
try {
fOut = new FileOutputStream(pictureFile);
bmp.compress(Bitmap.CompressFormat.JPEG, 85, fOut);
fOut.flush();
fOut.close();
} catch (FileNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
where onClick 删除图像的位置
public void exit( View view){
deleted = pictureFile.delete();
//startActivity(home);
close();
finish();
}