我有这个片段来从sd车卡中提取图像,但我得到的只是java.lang.nullPointerException:
try {
BitmapFactory.Options options = new BitmapFactory.Options();
options.inPreferredConfig = Bitmap.Config.ARGB_8888;
options.inSampleSize = 2;
options.inTempStorage = new byte[16*1024];
options.inJustDecodeBounds = true;
Bitmap bitmap = BitmapFactory.decodeFile(Environment.getExternalStorageDirectory().toString() + "/monImage.png", options);
image.setImageBitmap(bitmap);
// selected_photo = (ImageView) findViewById(R.id.selected_photo);
/*String photoPath="/"+ Environment.getExternalStorageDirectory().toString() + "/monImage.png";
Uri photoUri = Uri.parse(photoPath);
image.setImageBitmap(MediaStore.Images.Media.getBitmap(getContentResolver(),photoUri));*/
}
catch (Exception e){Log.d("merde>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>", "grrrrr " +e);}
我尝试了许多oder解决方案,但是,即使我更改了图像文件,我也总是遇到同样的问题。当我更改文件名以给出错误的文件名时,它会告诉我找不到文件:(
任何人都可以帮忙吗?我见过其他人有同样的问题,但没有看到对我有效的解决方案
答案 0 :(得分:1)
我试过了,这对我有用:
Bitmap bitmap = BitmapFactory.decodeFile(Environment.getExternalStorageDirectory().getAbsolutePath() + "/monImage.png");
如果您遇到更多问题,可能需要外部存储的状态:
boolean mExternalStorageAvailable, mExternalStorageWriteable;
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state))
{ mExternalStorageAvailable = true;
mExternalStorageWriteable = true;
}
else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state))
{ mExternalStorageAvailable = true;
mExternalStorageWriteable = false;
}
else
{ mExternalStorageAvailable = false;
mExternalStorageWriteable = false;
}