45

我正在寻找：现有照片库名称的列表（希望也是它们的顶部缩略图）图库的内容（然后我可以根据需要加载缩略图和全尺寸）

我将如何获取“画廊”列表（不知道这是否是 android 中用于画廊应用程序中可见图像分组的正确术语......）及其内容？我需要在不使用现有画廊显示的情况下访问其结构中的画廊（我正在创建一个全新的画廊，而不是照片请求者的覆盖层等）

我认为 MediaStore.Images 是我需要去的地方，但我没有看到任何可以给我分组的东西......

4

5 回答 5

82

分组由 定义MediaStore.Images.Media.BUCKET_DISPLAY_NAME。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());

}
于 2010-11-16T16:27:44.457 回答
39 
/**
 * 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;
}
于 2014-06-04T17:36:14.303 回答
23

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Vector保存在给定设备上找到的相册的相册。每个相册都将包含一个预览图像以及一个Vector包含相册所有图像的内部。

  1. 创建一个对象，该对象将保存从存储中提取的图像。我们将调用它PhoneAlbum。这就是它的外观：

    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;
    }
}

  2. 创建一个对象，该对象将保存相册中的图像，名为：PhonePhoto

    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;
    }
}

  3. 创建一个接口来处理完成后提取的图像。我们将调用它OnPhoneImagesObtained。这里是：

    public interface OnPhoneImagesObtained {

    void onComplete( Vector<PhoneAlbum> albums );
    void onError();

}

  4. 创建一个新类：DeviceImageManager

    public class DeviceImageManager {

}

  5. 创建DeviceImageManager后，添加以下方法：

    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();
    }
}

  6. 现在您所要做的就是将图像渲染到屏幕上。就我而言，我喜欢使用Picasso. 这是我的做法：

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

  7. 不要忘记在清单中添加读取外部存储的权限：

    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

而已。你已准备好出发！祝你好运！

于 2016-08-11T23:51:15.330 回答
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");

光标将包含尽可能多的元素，因为存在不同的存储桶名称，您还可以在每个光标位置获取计数以获取相册内的图像计数

这里的例子：

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();
        }

关于选择参数的一些解释：

contentResolver 在为 sqlLite 编译结果查询时添加括号，所以如果我们进行选择

"GROUP BY" + MediaStore.Images.ImageColumns.BUCKET_DISPLAY_NAME

它将被编译为“WHERE (GROUP BY bucket_display_name)”，并会在运行时引发 SQLiteException。否则，如果我们做出选择

"1) 分组 (" + MediaStore.Images.ImageColumns.BUCKET_DISPLAY_NAME

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

于 2018-09-19T13:01:29.270 回答
3

从此处下载源代码（以编程方式从 android 中的图库中获取所有图像）

activity_main.xml

<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>

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();
                    }
                }
            }
        }
    }

}
于 2017-03-22T11:34:36.257 回答