Question

我正在寻找：现有照片库名称列表（希望它们的顶部缩略图也是如此）图库的内容（我可以根据需要加载缩略图和完整尺寸）

我如何获取“画廊”的列表（不知道这是否是在Android应用程序中可见的图像分组中的正确术语...）及其内容？我需要访问其结构中的图库而不使用现有的图库显示（我正在创建一个全新的图库，而不是照片请求者的图层等。）

我认为MediaStore.Images是我需要的地方，但我没有看到任何会给我分组的内容...

Answer 1

分组由MediaStore.Images.Media.BUCKET_DISPLAY_NAME定义。以下是列出图像并记录其存储桶名称和date_taken的示例代码：

// which image properties are we querying
String[] projection = new String[] {
        MediaStore.Images.Media._ID,
        MediaStore.Images.Media.BUCKET_DISPLAY_NAME,
        MediaStore.Images.Media.DATE_TAKEN
};

// content:// style URI for the "primary" external storage volume
Uri images = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;

// Make the query.
Cursor cur = managedQuery(images,
        projection, // Which columns to return
        null,       // Which rows to return (all rows)
        null,       // Selection arguments (none)
        null        // Ordering
        );

Log.i("ListingImages"," query count=" + cur.getCount());

if (cur.moveToFirst()) {
    String bucket;
    String date;
    int bucketColumn = cur.getColumnIndex(
        MediaStore.Images.Media.BUCKET_DISPLAY_NAME);

    int dateColumn = cur.getColumnIndex(
        MediaStore.Images.Media.DATE_TAKEN);

    do {
        // Get the field values
        bucket = cur.getString(bucketColumn);
        date = cur.getString(dateColumn);

        // Do something with the values.
        Log.i("ListingImages", " bucket=" + bucket 
               + "  date_taken=" + date);
    } while (cur.moveToNext());

}

Answer 2

/**
 * Getting All Images Path
 * 
 * @param activity
 * @return ArrayList with images Path
 */
public static ArrayList<String> getAllShownImagesPath(Activity activity) {
    Uri uri;
    Cursor cursor;
    int column_index_data, column_index_folder_name;
    ArrayList<String> listOfAllImages = new ArrayList<String>();
    String absolutePathOfImage = null;
    uri = android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI;

    String[] projection = { MediaColumns.DATA,
            MediaStore.Images.Media.BUCKET_DISPLAY_NAME };

    cursor = activity.getContentResolver().query(uri, projection, null,
            null, null);

    column_index_data = cursor.getColumnIndexOrThrow(MediaColumns.DATA);
    column_index_folder_name = cursor
            .getColumnIndexOrThrow(MediaStore.Images.Media.BUCKET_DISPLAY_NAME);
    while (cursor.moveToNext()) {
        absolutePathOfImage = cursor.getString(column_index_data);

        listOfAllImages.add(absolutePathOfImage);
    }
    return listOfAllImages;
}

Answer 3

以下是几个简单步骤的完整解决方案：

接下来的几个步骤将指导您如何创建一个slug来保存在给定设备上找到的相册。每张专辑都会保留一张预览图片以及一张内部Vector，用于保存相册的所有图片。

创建一个对象，该对象将从存储中提取后保存图像。我们打算称之为Vector。这就是它的样子：
```
PhoneAlbum
```
创建一个对象，用于保存相册中的图像：public class PhoneAlbum { private int id; private String name; private String coverUri; private Vector<PhonePhoto> albumPhotos; public int getId() { return id; } public void setId( int id ) { this.id = id; } public String getName() { return name; } public void setName( String name ) { this.name = name; } public String getCoverUri() { return coverUri; } public void setCoverUri( String albumCoverUri ) { this.coverUri = albumCoverUri; } public Vector< PhonePhoto > getAlbumPhotos() { if ( albumPhotos == null ) { albumPhotos = new Vector<>(); } return albumPhotos; } public void setAlbumPhotos( Vector< PhonePhoto > albumPhotos ) { this.albumPhotos = albumPhotos; } }
```
PhonePhoto
```
创建一个界面，在完成后处理提取的图像。我们打算称之为public class PhonePhoto { private int id; private String albumName; private String photoUri; public int getId() { return id; } public void setId( int id ) { this.id = id; } public String getAlbumName() { return albumName; } public void setAlbumName( String name ) { this.albumName = name; } public String getPhotoUri() { return photoUri; } public void setPhotoUri( String photoUri ) { this.photoUri = photoUri; } }。这是：
```
OnPhoneImagesObtained
```
创建一个新类：public interface OnPhoneImagesObtained { void onComplete( Vector<PhoneAlbum> albums ); void onError(); }
```
DeviceImageManager
```
创建public class DeviceImageManager { }后，添加以下方法：
```
DeviceImageManager
```
现在你剩下的就是将图像渲染到屏幕上。就我而言，我喜欢使用public static void getPhoneAlbums( Context context , OnPhoneImagesObtained listener ){ // Creating vectors to hold the final albums objects and albums names Vector< PhoneAlbum > phoneAlbums = new Vector<>(); Vector< String > albumsNames = new Vector<>(); // which image properties are we querying String[] projection = new String[] { MediaStore.Images.Media.BUCKET_DISPLAY_NAME, MediaStore.Images.Media.DATA, MediaStore.Images.Media._ID }; // content: style URI for the "primary" external storage volume Uri images = MediaStore.Images.Media.EXTERNAL_CONTENT_URI; // Make the query. Cursor cur = context.getContentResolver().query(images, projection, // Which columns to return null, // Which rows to return (all rows) null, // Selection arguments (none) null // Ordering ); if ( cur != null && cur.getCount() > 0 ) { Log.i("DeviceImageManager"," query count=" + cur.getCount()); if (cur.moveToFirst()) { String bucketName; String data; String imageId; int bucketNameColumn = cur.getColumnIndex( MediaStore.Images.Media.BUCKET_DISPLAY_NAME); int imageUriColumn = cur.getColumnIndex( MediaStore.Images.Media.DATA); int imageIdColumn = cur.getColumnIndex( MediaStore.Images.Media._ID ); do { // Get the field values bucketName = cur.getString( bucketNameColumn ); data = cur.getString( imageUriColumn ); imageId = cur.getString( imageIdColumn ); // Adding a new PhonePhoto object to phonePhotos vector PhonePhoto phonePhoto = new PhonePhoto(); phonePhoto.setAlbumName( bucketName ); phonePhoto.setPhotoUri( data ); phonePhoto.setId( Integer.valueOf( imageId ) ); if ( albumsNames.contains( bucketName ) ) { for ( PhoneAlbum album : phoneAlbums ) { if ( album.getName().equals( bucketName ) ) { album.getAlbumPhotos().add( phonePhoto ); Log.i( "DeviceImageManager", "A photo was added to album => " + bucketName ); break; } } } else { PhoneAlbum album = new PhoneAlbum(); Log.i( "DeviceImageManager", "A new album was created => " + bucketName ); album.setId( phonePhoto.getId() ); album.setName( bucketName ); album.setCoverUri( phonePhoto.getPhotoUri() ); album.getAlbumPhotos().add( phonePhoto ); Log.i( "DeviceImageManager", "A photo was added to album => " + bucketName ); phoneAlbums.add( album ); albumsNames.add( bucketName ); } } while (cur.moveToNext()); } cur.close(); listener.onComplete( phoneAlbums ); } else { listener.onError(); } }。我是这样做的：
```
Picasso
```

不要忘记在清单中添加读取外部存储空间的权限：

    Picasso.with( getActivity() )
                .load( "file:" + mPhoneAlbums.get( i ).getCoverUri() )
                .centerCrop()
                .fit()
                .placeholder( R.drawable.temp_image )
                .into( mAlbumPreview );

那就是它。你已准备好出发！祝你好运！

Answer 4

从此处下载源代码（Get all images from gallery in android programmatically）

<强> activity_main.xml中

<RelativeLayout android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#ffffff"
    xmlns:android="http://schemas.android.com/apk/res/android">


    <GridView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/gv_folder"
        android:numColumns="2"
        android:layout_marginLeft="10dp"
        android:layout_marginRight="10dp"></GridView>


</RelativeLayout>

<强> MainActivity.java

package galleryimages.galleryimages;

import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.net.Uri;
import android.provider.MediaStore;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.GridView;
import android.widget.Toast;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {
    public static ArrayList<Model_images> al_images = new ArrayList<>();
    boolean boolean_folder;
    Adapter_PhotosFolder obj_adapter;
    GridView gv_folder;
    private static final int REQUEST_PERMISSIONS = 100;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        gv_folder = (GridView)findViewById(R.id.gv_folder);

        gv_folder.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                Intent intent = new Intent(getApplicationContext(), PhotosActivity.class);
                intent.putExtra("value",i);
                startActivity(intent);
            }
        });


        if ((ContextCompat.checkSelfPermission(getApplicationContext(),
                Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) && (ContextCompat.checkSelfPermission(getApplicationContext(),
                Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED)) {
            if ((ActivityCompat.shouldShowRequestPermissionRationale(MainActivity.this,
                    Manifest.permission.WRITE_EXTERNAL_STORAGE)) && (ActivityCompat.shouldShowRequestPermissionRationale(MainActivity.this,
                    Manifest.permission.READ_EXTERNAL_STORAGE))) {

            } else {
                ActivityCompat.requestPermissions(MainActivity.this,
                        new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE},
                        REQUEST_PERMISSIONS);
            }
        }else {
            Log.e("Else","Else");
            fn_imagespath();
        }



    }

    public ArrayList<Model_images> fn_imagespath() {
        al_images.clear();

        int int_position = 0;
        Uri uri;
        Cursor cursor;
        int column_index_data, column_index_folder_name;

        String absolutePathOfImage = null;
        uri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;

        String[] projection = {MediaStore.MediaColumns.DATA, MediaStore.Images.Media.BUCKET_DISPLAY_NAME};

        final String orderBy = MediaStore.Images.Media.DATE_TAKEN;
        cursor = getApplicationContext().getContentResolver().query(uri, projection, null, null, orderBy + " DESC");

        column_index_data = cursor.getColumnIndexOrThrow(MediaStore.MediaColumns.DATA);
        column_index_folder_name = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.BUCKET_DISPLAY_NAME);
        while (cursor.moveToNext()) {
            absolutePathOfImage = cursor.getString(column_index_data);
            Log.e("Column", absolutePathOfImage);
            Log.e("Folder", cursor.getString(column_index_folder_name));

            for (int i = 0; i < al_images.size(); i++) {
                if (al_images.get(i).getStr_folder().equals(cursor.getString(column_index_folder_name))) {
                    boolean_folder = true;
                    int_position = i;
                    break;
                } else {
                    boolean_folder = false;
                }
            }


            if (boolean_folder) {

                ArrayList<String> al_path = new ArrayList<>();
                al_path.addAll(al_images.get(int_position).getAl_imagepath());
                al_path.add(absolutePathOfImage);
                al_images.get(int_position).setAl_imagepath(al_path);

            } else {
                ArrayList<String> al_path = new ArrayList<>();
                al_path.add(absolutePathOfImage);
                Model_images obj_model = new Model_images();
                obj_model.setStr_folder(cursor.getString(column_index_folder_name));
                obj_model.setAl_imagepath(al_path);

                al_images.add(obj_model);


            }


        }


        for (int i = 0; i < al_images.size(); i++) {
            Log.e("FOLDER", al_images.get(i).getStr_folder());
            for (int j = 0; j < al_images.get(i).getAl_imagepath().size(); j++) {
                Log.e("FILE", al_images.get(i).getAl_imagepath().get(j));
            }
        }
        obj_adapter = new Adapter_PhotosFolder(getApplicationContext(),al_images);
        gv_folder.setAdapter(obj_adapter);
        return al_images;
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);

        switch (requestCode) {
            case REQUEST_PERMISSIONS: {
                for (int i = 0; i < grantResults.length; i++) {
                    if (grantResults.length > 0 && grantResults[i] == PackageManager.PERMISSION_GRANTED) {
                        fn_imagespath();
                    } else {
                        Toast.makeText(MainActivity.this, "The app was not allowed to read or write to your storage. Hence, it cannot function properly. Please consider granting it this permission", Toast.LENGTH_LONG).show();
                    }
                }
            }
        }
    }

}

Answer 5

我找到了一种无需遍历每张照片即可获取相册的方法。

 String[] projection = new String[]{
                "COUNT(*) as count",
                MediaStore.Images.ImageColumns.BUCKET_DISPLAY_NAME,
                MediaStore.Images.ImageColumns.DATA,
                "MAX (" + MediaStore.Images.ImageColumns.DATE_TAKEN + ") as max"};

 Context context = ServiceProvider.getInstance().getApplicationContext();
 Cursor cursor = context.getContentResolver().query(
                MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
                projection,
                "1) GROUP BY (" + MediaStore.Images.ImageColumns.BUCKET_DISPLAY_NAME,
                null,
                "max DESC");

由于存在不同的存储桶名称，光标将包含尽可能多的元素，并且您也可以在每个光标位置进行计数以获取相册中的图像计数

此处示例：

if (cursor != null) {
            if (cursor.moveToFirst()) {
                do {
                //gets image path, it will always be a latest image because of sortOrdering by MAX date_taken
                String path = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA));
                //gets count via alias ("as count" in projection)
                int count = cursor.getInt(cursor.getColumnIndex("count"));

                //do you logic here
                ...

                } while (cursor.moveToNext());
            }

            cursor.close();
        }

有关选择参数的一些解释：

contentResolver在为sqlLite编译结果查询时添加括号，因此如果我们像

那样进行选择

“ GROUP BY” + MediaStore.Images.ImageColumns.BUCKET_DISPLAY_NAME

它将被编译为“ WHERE（GROUP BY bucket_display_name）”，并在运行时导致SQLiteException。否则，如果我们选择

“ 1）GROUP BY（” + MediaStore.Images.ImageColumns.BUCKET_DISPLAY_NAME

它将被编译为“ WHERE（1）GROUP BY（bucket_display_name）”，这是正确的

获取Android上的照片库列表

5 个答案: