Android：如何获取所有带照片的文件夹？

时间：2014-05-15 18:28:33

标签： android gallery photo image-gallery

我想创建一个画廊。我知道如何获取所有照片并在网格视图中显示它们。但有人可以解释如何获取和显示文件夹（带照片）？

我启动apk文件后出错了。看看我的xml文件，这可能是错的??? gridview.xml：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
    <GridView
        android:id="@+id/gridView"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="top"
        android:layout_marginBottom="-10dp"
        android:layout_marginLeft="-10dp"
        android:layout_marginRight="-10dp"
        android:layout_marginTop="-10dp"
        android:horizontalSpacing="-15dp"
        android:numColumns="3"
        android:padding="0dp"
        android:verticalSpacing="-15dp" >
    </GridView>
    </LinearLayout>

和grid_item：

<ImageView
        android:id="@+id/imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="right"
        android:layout_marginRight="2dp"
        android:layout_marginTop="2dp"

        android:gravity="center"
        android:scaleType="center"
         />

6 个答案:

答案 0 :(得分：27)

编辑：我已经为您举了一个工作示例。它的工作原理如下：

它将在一个目录中开始（在下面的例子中，/storage/sdcard/DCIM/）。如果目录包含任何图像，则会显示它们。如果它包含任何子目录，它将检查它们是否包含图像或它们自己的子目录。如果是，则会显示文件夹图标。单击文件夹图标将打开文件夹，并显示它包含的图像/子目录。

请注意，这只是为了让您大致了解如何实现它 - 您仍需要稍微处理此代码以提高效率，尤其是在内存使用方面，但我和＃39 ;我在我的模拟器上运行它，代码正在运行。

在您的活动中

public class MainActivity extends Activity implements OnItemClickListener {

    List<GridViewItem> gridItems;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        setGridAdapter("/storage/sdcard/DCIM/");
    }


    /**
     * This will create our GridViewItems and set the adapter
     * 
     * @param path
     *            The directory in which to search for images
     */
    private void setGridAdapter(String path) {
        // Create a new grid adapter
        gridItems = createGridItems(path);
        MyGridAdapter adapter = new MyGridAdapter(this, gridItems);

        // Set the grid adapter
        GridView gridView = (GridView) findViewById(R.id.gridView);
        gridView.setAdapter(adapter);

        // Set the onClickListener
        gridView.setOnItemClickListener(this);
    }


    /**
     * Go through the specified directory, and create items to display in our
     * GridView
     */
    private List<GridViewItem> createGridItems(String directoryPath) {
        List<GridViewItem> items = new ArrayList<GridViewItem>();

        // List all the items within the folder.
        File[] files = new File(directoryPath).listFiles(new ImageFileFilter());
        for (File file : files) {

            // Add the directories containing images or sub-directories
            if (file.isDirectory()
                && file.listFiles(new ImageFileFilter()).length > 0) {

                items.add(new GridViewItem(file.getAbsolutePath(), true, null));
            }
            // Add the images
            else {
                Bitmap image = BitmapHelper.decodeBitmapFromFile(file.getAbsolutePath(),
                                                                 50,
                                                                 50);
                items.add(new GridViewItem(file.getAbsolutePath(), false, image));
            }
        }

        return items;
    }


    /**
     * Checks the file to see if it has a compatible extension.
     */
    private boolean isImageFile(String filePath) {
        if (filePath.endsWith(".jpg") || filePath.endsWith(".png"))
        // Add other formats as desired
        {
            return true;
        }
        return false;
    }


    @Override
    public void
            onItemClick(AdapterView<?> parent, View view, int position, long id) {

        if (gridItems.get(position).isDirectory()) {
            setGridAdapter(gridItems.get(position).getPath());
        }
        else {
            // Display the image
        }

    }

    /**
     * This can be used to filter files.
     */
    private class ImageFileFilter implements FileFilter {

        @Override
        public boolean accept(File file) {
            if (file.isDirectory()) {
                return true;
            }
            else if (isImageFile(file.getAbsolutePath())) {
                return true;
            }
            return false;
        }
    }

}

然后你需要创建适配器，它应该扩展BaseAdapter，看起来像这样。

public class MyGridAdapter extends BaseAdapter {

    LayoutInflater inflater;
    List<GridViewItem> items;


    public MyGridAdapter(Context context, List<GridViewItem> items) {
        this.items = items;
        inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }


    @Override
    public int getCount() {
        return items.size();
    }


    @Override
    public Object getItem(int position) {
        return items.get(position);
    }


    @Override
    public long getItemId(int position) {
        return position;
    }


    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        if (convertView == null) {
            convertView = inflater.inflate(R.layout.grid_item, null);
        }

        TextView text = (TextView) convertView.findViewById(R.id.textView);
        text.setText(items.get(position).getPath());

        ImageView imageView = (ImageView) convertView.findViewById(R.id.imageView);
        Bitmap image = items.get(position).getImage();

        if (image != null){
            imageView.setImageBitmap(image);
        }
        else {
            // If no image is provided, display a folder icon.
            imageView.setImageResource(R.drawable.your_folder_icon);
        }

        return convertView;
    }

}

您需要创建一个代表每个网格项的类

public class GridViewItem {

    private String path;
    private boolean isDirectory;
    private Bitmap image;


    public GridViewItem(String path, boolean isDirectory, Bitmap image) {
        this.path = path;
        this.isDirectory = isDirectory;
        this.image = image;
    }


    public String getPath() {
        return path;
    }


    public boolean isDirectory() {
        return isDirectory;
    }


    public Bitmap getImage() {
        return image;
    }
}

用于处理图像的类

public abstract class BitmapHelper {

    public static Bitmap decodeBitmapFromFile(String imagePath,
                                              int reqWidth,
                                              int reqHeight) {

        // First decode with inJustDecodeBounds=true to check dimensions
        final BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(imagePath, options);

        // Calculate inSampleSize
        options.inSampleSize = calculateSampleSize(options, reqWidth, reqHeight);

        // Decode bitmap with inSampleSize set
        options.inJustDecodeBounds = false;
        return BitmapFactory.decodeFile(imagePath, options);
    }


    private static int calculateSampleSize(BitmapFactory.Options options,
                                           int reqHeight,
                                           int reqWidth) {

        // Raw height and width of image
        final int height = options.outHeight;
        final int width = options.outWidth;
        int inSampleSize = 1;

        if (height > reqHeight || width > reqWidth) {

            final int halfHeight = height / 2;
            final int halfWidth = width / 2;

            // Calculate the largest inSampleSize value that is a power of 2 and
            // keeps both
            // height and width larger than the requested height and width.
            while ((halfHeight / inSampleSize) > reqHeight
                   && (halfWidth / inSampleSize) > reqWidth) {
                inSampleSize *= 2;
            }
        }

        return inSampleSize;

    }

}

activity_main.xml中

<?xml version="1.0" encoding="utf-8"?>
<GridView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/gridView"
    android:numColumns="auto_fit"
    android:gravity="center"
    android:columnWidth="150dp"
    android:stretchMode="columnWidth"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >
</GridView>

grid_item.xml 

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="150dp"
    android:layout_height="150dp"
    android:padding="5dp" >

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="150dp"
        android:layout_height="150dp"
        android:scaleType="centerCrop"
        android:src="@drawable/andrew_salgado" >
    </ImageView>

    <RelativeLayout
        android:layout_width="fill_parent"
        android:layout_height="20dp"
        android:layout_alignParentBottom="true"
        android:alpha="0.8"
        android:background="#000000" >

        <TextView
            android:id="@+id/textView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:ellipsize="start"
            android:singleLine="true"
            android:textColor="#FFFFFF" />

    </RelativeLayout>

</RelativeLayout>

enter image description here

答案 1 :(得分：1)

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();
                    }
                }
            }
        }
    }

}

<强> adapter_photosfolder.xml 

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">


    <LinearLayout
        android:layout_width="match_parent"
        android:orientation="vertical"
        android:layout_marginTop="10dp"
        android:layout_marginLeft="10dp"
        android:background="@drawable/drawable_photofolder"
        android:layout_marginRight="10dp"
        android:layout_marginBottom="10dp"
        android:layout_height="match_parent">
    <ImageView
        android:layout_width="150dp"
        android:layout_gravity="center"
        android:layout_height="150dp"
        android:id="@+id/iv_image"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/tv_folder"
        android:textStyle="bold"
        android:textColor="#000000"
        android:layout_marginLeft="10dp"
        android:textSize="15dp"/>

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/tv_folder2"
            android:textColor="#dfdfdf"
            android:layout_marginBottom="10dp"
            android:layout_marginLeft="10dp"
            android:textSize="15dp"/>
    </LinearLayout>

    <RelativeLayout
        android:layout_width="match_parent"
        android:id="@+id/rl_select"
        android:alpha="0.5"
        android:layout_height="match_parent">

    </RelativeLayout>

</RelativeLayout>

<强> Adapter_PhotosFolder.java 

package galleryimages.galleryimages;


import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.bumptech.glide.Glide;
import com.bumptech.glide.load.engine.DiskCacheStrategy;

import java.util.ArrayList;


public class Adapter_PhotosFolder extends ArrayAdapter<Model_images> {

    Context context;
    ViewHolder viewHolder;
    ArrayList<Model_images> al_menu = new ArrayList<>();


    public Adapter_PhotosFolder(Context context, ArrayList<Model_images> al_menu) {
        super(context, R.layout.adapter_photosfolder, al_menu);
        this.al_menu = al_menu;
        this.context = context;


    }

    @Override
    public int getCount() {

        Log.e("ADAPTER LIST SIZE", al_menu.size() + "");
        return al_menu.size();
    }

    @Override
    public int getItemViewType(int position) {
        return position;
    }

    @Override
    public int getViewTypeCount() {
        if (al_menu.size() > 0) {
            return al_menu.size();
        } else {
            return 1;
        }
    }

    @Override
    public long getItemId(int position) {
        return position;
    }


    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {

        if (convertView == null) {

            viewHolder = new ViewHolder();
            convertView = LayoutInflater.from(getContext()).inflate(R.layout.adapter_photosfolder, parent, false);
            viewHolder.tv_foldern = (TextView) convertView.findViewById(R.id.tv_folder);
            viewHolder.tv_foldersize = (TextView) convertView.findViewById(R.id.tv_folder2);
            viewHolder.iv_image = (ImageView) convertView.findViewById(R.id.iv_image);


            convertView.setTag(viewHolder);
        } else {
            viewHolder = (ViewHolder) convertView.getTag();
        }

        viewHolder.tv_foldern.setText(al_menu.get(position).getStr_folder());
            viewHolder.tv_foldersize.setText(al_menu.get(position).getAl_imagepath().size()+"");



        Glide.with(context).load("file://" + al_menu.get(position).getAl_imagepath().get(0))
                .diskCacheStrategy(DiskCacheStrategy.NONE)
                .skipMemoryCache(true)
                .into(viewHolder.iv_image);


        return convertView;

    }

    private static class ViewHolder {
        TextView tv_foldern, tv_foldersize;
        ImageView iv_image;


    }


}

答案 2 :(得分：0)

您可以尝试这样：

public void searchImageFromSpecificDirectory() {

        String path = null;

        String uri = MediaStore.Images.Media.DATA;
        // if GetImageFromThisDirectory is the name of the directory from which image will be retrieved
        String condition = uri + " like '%/GetImageFromThisDirectory/%'";
        String[] projection = { uri, MediaStore.Images.Media.DATE_ADDED,
                MediaStore.Images.Media.SIZE };
        Vector additionalFiles = null;
        try {
            if (additionalFiles == null) {
                additionalFiles = new Vector<String>();
            }



            Cursor cursor = managedQuery(
                    MediaStore.Images.Media.EXTERNAL_CONTENT_URI, projection,
                    condition, null, null);
            if (cursor != null) {

                boolean isDataPresent = cursor.moveToFirst();

                if (isDataPresent) {

                    do {

                        path = cursor.getString(cursor.getColumnIndex(uri));
System.out.println("...path..."+path);
additionalFiles.add(path);
            }while(cursor.moveToNext());
                }
            if (cursor != null) {
                cursor.close();
            }
            }

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

How to Getting Images from Sdcard's folder's Subfolder?

答案 3 :(得分：0)

您可以按照其他代码进行操作。比如

ArrayList<String> f = new ArrayList<String>();// list of file paths
File[] listFile;

public void getFromSdcard()
{
    File file= new File(android.os.Environment.getExternalStorageDirectory(),"TMyFolder");

        if (file.isDirectory())
        {
            listFile = file.listFiles();


            for (int i = 0; i < listFile.length; i++)
            {

                f.add(listFile[i].getAbsolutePath());

            }
        }
}
必须在AndroidMenifest.xml中授予

权限。比如

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

how to display images saved in sdcard folder in android

答案 4 :(得分：0)

Uri lUri;
    Cursor lCursor;
    Log.w("ImageUtils: ", "GetAllImagesFoldersCursor");

    lUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
    String[] lProjection = {"DISTINCT " + MediaStore.Images.Media.BUCKET_DISPLAY_NAME,
            MediaStore.Images.Media.DATA, MediaStore.Images.Media.DATE_TAKEN};
    String lSelectionString = MediaStore.Images.Media.BUCKET_DISPLAY_NAME +
            " IS NOT NULL) GROUP BY (" + MediaStore.Images.Media.BUCKET_DISPLAY_NAME;
    lCursor = aContext.getContentResolver().query(lUri, lProjection, lSelectionString,
            null, null);

    if (lCursor != null) {
        Log.w("ImageUtils: ", "Returning total Folders: " + lCursor.getCount());
    }
    return lCursor;

答案 5 :(得分：0)

我在我的任务中使用了@deepshikha 的代码，它运行良好，但我们仍然需要一些更改

<块引用>
  1. 它还显示GIFs
  2. 当 NPE 为空时，它会抛出 cursor.getString(column_index_folder_name)（基本上它是你的根目录，或者我们可以说 /storage/emulated/0/）
  3. 解决第二个问题后开始第三个问题（我仍然没有解决）

所以，我从：

if (boolean_folder) {...
} else {...
}

到：

boolean isGif = absolutePathOfImage.substring(absolutePathOfImage.lastIndexOf(".") + 1).equalsIgnoreCase("gif");

     if (!isGif) {
                if (boolean_folder) {
                    ArrayList<String> al_path = new ArrayList<>(albumArrayList.get(int_position).getAlbum_imagePath());

                    al_path.add(absolutePathOfImage);
                    albumArrayList.get(int_position).setAlbum_imagePath(al_path);
                } else {
                    ArrayList<String> al_path = new ArrayList<>();
                    al_path.add(absolutePathOfImage);
                    Album obj_model = new Album();
                    if (cursor.getString(column_index_folder_name) == null) {
                        obj_model.setStr_folder("0");
                    } else {
                        obj_model.setStr_folder(cursor.getString(column_index_folder_name));
                    }
                    obj_model.setAlbum_imagePath(al_path);
                    albumArrayList.add(obj_model);
                }
            }

当 NPE 为空并创建 cursor.getString(column_index_folder_name) 时，此代码将阻止您使用 foldername 0，即使它阻止列出 GIFs。这就是我们可以防止应用crash 或NPE

但是下一个问题从这里开始（我之前简单提到的第三个问题）是假设如果您的设备的根路径上有 3 个图像，那么这将创建三个 0 文件夹，现在我不知道如何完成这项任务，我需要帮助（任何帮助将不胜感激）。

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