[英]How to get access to list of files from /storage/emulated/0
I'm writing an Android application, which can capture and watch photos. 我正在编写一个可以捕获和观看照片的Android应用程序。 All captured images appear in grid RecyclerView (CameraActivity), where I made all elements are clickable. 所有捕获的图像都显示在网格RecyclerView(CameraActivity)中,在该网格中,所有元素都可以单击。 To store images I'm using internal memory within getExternalFilesDir(Environment.DIRECTORY_PICTURES), because I want to make them accessible only from my application. 为了存储图像,我在getExternalFilesDir(Environment.DIRECTORY_PICTURES)中使用内部存储器,因为我想使它们只能从我的应用程序访问。 In the result the full path of my picture folder is /storage/emulated/0/Android/data/com._,_/files/Pictures/image gallery . 结果,我的图片文件夹的完整路径为/storage/emulated/0/Android/data/com._,_/files/Pictures/image gallery 。 In the second activity of my app I want to slide between images and for this I need to get the list of image paths from above storage directory. 在我的应用程序的第二个活动中,我想在图像之间滑动,为此,我需要从存储目录上方获取图像路径列表。 But my problem is that I don't know how to do this. 但是我的问题是我不知道该怎么做。 I've tried to use getDir("image gallery", 0) but it simply creates a new folder with path /data/data/com.webartil.cameraapp/app_image gallery . 我尝试使用getDir(“ image gallery”,0),但它只是使用路径/data/data/com.webartil.cameraapp/app_image gallery创建一个新文件夹。 So I need your help to solve my problem. 因此,我需要您的帮助来解决我的问题。 CameraActivity CameraActivity
public class CameraActivity extends AppCompatActivity implements ImageAdapter.OnImageClickListener {
private static final int ACTIVITY_START_CAMERA_APP = 0;
public static final String PATH = "PATH";
private String GALLERY_LOCATION = "image gallery";
private File mGalleryFolder;
private RecyclerView mRecyclerView;
private ImageAdapter imageAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_camera);
createImageGallery();
Toolbar toolbar = findViewById(R.id.toolbar_activity_camera);
setSupportActionBar(toolbar);
initRecyclerView();
FloatingActionButton fab = findViewById(R.id.fab_shoot_photo);
fab.setOnClickListener(view -> takePhoto());
}
private void initRecyclerView() {
mRecyclerView = findViewById(R.id.gallery_recycler_view);
RecyclerView.LayoutManager layoutManager = new GridLayoutManager(this, 3);
mRecyclerView.setLayoutManager(layoutManager);
imageAdapter = new ImageAdapter(this, mGalleryFolder, this);
mRecyclerView.setAdapter(imageAdapter);
}
public void takePhoto() {
Intent callCameraApplicationIntent = new Intent();
callCameraApplicationIntent.setAction(MediaStore.ACTION_IMAGE_CAPTURE);
File photoFile = null;
try {
photoFile = createImageFile();
} catch (IOException e) {
e.printStackTrace();
}
callCameraApplicationIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(photoFile));
startActivityForResult(callCameraApplicationIntent, ACTIVITY_START_CAMERA_APP);
}
@Override
protected void onActivityResult(final int requestCode, final int resultCode, final Intent data) {
RecyclerView.Adapter newImageAdapter = new ImageAdapter(this, mGalleryFolder, this);
mRecyclerView.swapAdapter(newImageAdapter, false);
}
File createImageFile() throws IOException {
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String imageFileName = "IMAGE_" + timeStamp + "_";
return File.createTempFile(imageFileName,".jpg", mGalleryFolder);
}
private void createImageGallery() {
mGalleryFolder =
new File(getApplicationContext().getExternalFilesDir(Environment.DIRECTORY_PICTURES),
GALLERY_LOCATION);
if(!mGalleryFolder.exists()) {
mGalleryFolder.mkdirs();
}
Log.d(PATH, mGalleryFolder.getAbsolutePath());
}
@Override
public void onClickImage(final View view, final int position) {
Intent intent = new Intent(this, ImageActivity.class);
intent.putExtra(PATH, position);
startActivity(intent);
}
}
First: mentioned directory path is accessible for all apps. 第一:提到的目录路径可用于所有应用程序。
Second: listings can be done with new File(path).listFiles();
第二:可以使用new File(path).listFiles();
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