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我從我的SD卡讀取圖像路徑URL時出現問題。相機目錄空
它總是返回該錯誤:嘗試獲取空數組的長度:嘗試讓我的手機
瀏覽圖片上的空數組的長度我得到這個目錄作爲相機膠捲目錄:
/storage/emulated/0/DCIM/Camera/imageName
我把我的清單文件權限:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
這是我的代碼:
public void processImages() {
listOfImages = new ArrayList<>();
Boolean isSDPresent = android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED);
if (isSDPresent) {
//returns same path - /storage/emulated/0/DCIM/Camera/
String path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM).getPath()+"/Camera/";
File f = new File(path);
listOfImages = scanPhotos(f);
} else {
Toast.makeText(this, "sd not present", Toast.LENGTH_SHORT).show();
}
}
public List<File> scanPhotos(File directory) {
List<File> listOfPictures = new ArrayList<>();
//this returns null
File[] files = directory.listFiles();
for (File file : files
) {
if (file.isDirectory() && !file.isHidden()) {
listOfPictures.addAll(scanPhotos(file));
} else {
if (file.getName().endsWith(".jpg") || file.getName().endsWith(".jpeg") || file.getName().endsWith(".png")) {
listOfPictures.add(file);
}
}
}
return listOfPictures;
}
做
f.canRead() - returns false
您是否檢查了運行時權限? – Rahul
這解決了我的問題。我完全忘記了那些棉花糖的許可。非常感謝你 – hyrulelink16