How can I display images from a specific folder on

2019-01-09 05:23发布

站内文章 / Android
22 0 0

问题:

How can I display all images from a specific folder on android gallery like, for example, whatapp does. I`m using MediaScannerConnectionClient 

File folder = new File("/sdcard/myfolder/");
allFiles = folder.list();
SCAN_PATH=Environment.getExternalStorageDirectory().toString()+"/myfolder/"+allFiles[0];
@Override
public void onScanCompleted(String path, Uri uri) {
    try {
        if (uri != null) {
            Intent intent = new Intent(Intent.ACTION_VIEW);
            intent.setData(uri);
            startActivity(intent);

        }
    } finally {
        conn.disconnect();
        conn = null;
    }
}

private void startScan() {
    if (conn != null) {
        conn.disconnect();
    }
    conn = new MediaScannerConnection(this, this);
    conn.connect();
}
    @Override
public void onMediaScannerConnected() {
    conn.scanFile(SCAN_PATH, "image/*");
}

But I`m getting a error at this point:

    Intent intent = new Intent(Intent.ACTION_VIEW);
    intent.setData(uri);
    startActivity(intent);

Specific here:

startActivity(intent);

Fail to get type for: content://media/external/images/media/267830 No Activity found to handle Intent

On onScanCompleted my path and uri parameters are not null.

回答1:

Hi you can use the code below, i hope it helps you .

package com.example.browsepicture;

import java.io.File;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.media.MediaScannerConnection;
import android.media.MediaScannerConnection.MediaScannerConnectionClient;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class BrowsePicture2 extends Activity {
    String SCAN_PATH;
    File[] allFiles ;
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_browse_picture);

        File folder = new File(Environment.getExternalStorageDirectory().getPath()+"/aaaa/");
        allFiles = folder.listFiles();

        ((Button) findViewById(R.id.button1))
                .setOnClickListener(new OnClickListener() {
                    public void onClick(View arg0) {
                        new SingleMediaScanner(BrowsePicture2.this, allFiles[0]);
                    }
                });
    }

    public class SingleMediaScanner implements MediaScannerConnectionClient {

        private MediaScannerConnection mMs;
        private File mFile;

        public SingleMediaScanner(Context context, File f) {
            mFile = f;
            mMs = new MediaScannerConnection(context, this);
            mMs.connect();
        }

        public void onMediaScannerConnected() {
            mMs.scanFile(mFile.getAbsolutePath(), null);
        }

        public void onScanCompleted(String path, Uri uri) {
            Intent intent = new Intent(Intent.ACTION_VIEW);
            intent.setData(uri);
            startActivity(intent);
            mMs.disconnect();
        }

    }
}


回答2:

You should add Grid view Adapter class.

public class GalleryPictureActivity extends Activity
{
    private String[]        FilePathStrings;
    private File[]          listFile;
    GridView                grid;
    GridViewAdapter         adapter;
    File                    file;
    public static Bitmap    bmp = null;
    ImageView               imageview;

    @Override
    protected void onCreate (Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_gallery_picture);
        // Check for SD Card
        if (!Environment.getExternalStorageState().equals(
                Environment.MEDIA_MOUNTED))
        {
            Toast.makeText(this, "Error! No SDCARD Found!",
                    Toast.LENGTH_LONG).show();
        }
        else
        {
            // Locate the image folder in your SD Card
            file = new File(Environment.getExternalStorageDirectory()
                    .getPath() + "/images");
        }
        if (file.isDirectory())
        {
            listFile = file.listFiles();
            FilePathStrings = new String[listFile.length];
            for (int i = 0; i < listFile.length; i++)
            {
                FilePathStrings[i] = listFile[i].getAbsolutePath();
            }
        }
        grid = (GridView)findViewById(R.id.gridview);
        adapter = new GridViewAdapter(this, FilePathStrings);
        grid.setAdapter(adapter);

        grid.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick (AdapterView<?> parent, View view,
                    int position, long id)
            {
                imageview = (ImageView)findViewById(R.id.imageView1);
                int targetWidth = 700;
                int targetHeight = 500;
                BitmapFactory.Options bmpOptions = new BitmapFactory.Options();
                bmpOptions.inJustDecodeBounds = true;
                BitmapFactory.decodeFile(FilePathStrings[position],
                        bmpOptions);
                int currHeight = bmpOptions.outHeight;
                int currWidth = bmpOptions.outWidth;
                int sampleSize = 1;
                if (currHeight > targetHeight || currWidth > targetWidth)
                {
                    if (currWidth > currHeight)
                        sampleSize = Math.round((float)currHeight
                                / (float)targetHeight);
                    else
                        sampleSize = Math.round((float)currWidth
                                / (float)targetWidth);
                }
                bmpOptions.inSampleSize = sampleSize;
                bmpOptions.inJustDecodeBounds = false;
                bmp = BitmapFactory.decodeFile(FilePathStrings[position],
                        bmpOptions);
                imageview.setImageBitmap(bmp);
                imageview.setScaleType(ImageView.ScaleType.FIT_XY);
                bmp = null;

            }
        });

    }
}

Another Class GridView Adapter :

   public class GridViewAdapter extends BaseAdapter
{
    private Activity                activity;
    private String[]                filepath;
    private static LayoutInflater   inflater    = null;
    Bitmap                          bmp         = null;

    public GridViewAdapter (Activity a, String[] fpath)
    {
        activity = a;
        filepath = fpath;
        inflater = (LayoutInflater)activity
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    public int getCount ()
    {
        return filepath.length;
    }

    public Object getItem (int position)
    {
        return position;
    }

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

    public View getView (int position, View convertView, ViewGroup parent)
    {
        View vi = convertView;
        if (convertView == null)
            vi = inflater.inflate(R.layout.gridview_item, null);
        ImageView image = (ImageView)vi.findViewById(R.id.image);
        int targetWidth = 100;
        int targetHeight = 100;
        BitmapFactory.Options bmpOptions = new BitmapFactory.Options();
        bmpOptions.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(filepath[position], bmpOptions);
        int currHeight = bmpOptions.outHeight;
        int currWidth = bmpOptions.outWidth;
        int sampleSize = 1;
        if (currHeight > targetHeight || currWidth > targetWidth)
        {
            if (currWidth > currHeight)
                sampleSize = Math.round((float)currHeight
                        / (float)targetHeight);
            else
                sampleSize = Math.round((float)currWidth
                        / (float)targetWidth);
        }
        bmpOptions.inSampleSize = sampleSize;
        bmpOptions.inJustDecodeBounds = false;
        bmp = BitmapFactory.decodeFile(filepath[position], bmpOptions);
        image.setImageBitmap(bmp);
        image.setScaleType(ImageView.ScaleType.FIT_XY);
        bmp = null;
        return vi;
    }
}

Activity:

activity_gallery_picture:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/LinearLayout1"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:gravity="center" >

    <GridView
            android:id="@+id/gridview"
            android:layout_width="fill_parent"
            android:layout_height="match_parent" 
            android:layout_weight=".85">

   </GridView>

   <ImageView
           android:id="@+id/imageView1"
           android:layout_width="fill_parent"
           android:layout_height="fill_parent"
           android:layout_weight=".25"
           android:scaleType="fitXY"
           android:src="@drawable/galleryimage" />

  </LinearLayout>

Another activity Layout :

 <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" >
     <ImageView
             android:id="@+id/image"
             android:layout_width="fill_parent"
             android:layout_height="wrap_content" />
 </RelativeLayout>


回答3:

You can use android.database.Cursor

public boolean OpenGalleryFromFolder(android.content.Context context, String folderName)
{
    String filePath = android.os.Environment.getExternalStorageDirectory().getPath() + "/Pictures/" + folderName + "/";
    return OpenGalleryFromPathToFolder(context, filePath);
}

// Finds the first image in the specified folder and uses it to open a the devices native gallery app with all images in that folder.
public boolean OpenGalleryFromPathToFolder(android.content.Context context, String folderPath)
{
    java.io.File folder = new java.io.File(folderPath);
    java.io.File[] allFiles = folder.listFiles();

    if (allFiles != null && allFiles.length > 0)
    {
        android.net.Uri imageInFolder = getImageContentUri(context, allFiles[0]);
        if (imageInFolder != null)
        {
            android.content.Intent intent = new android.content.Intent(android.content.Intent.ACTION_VIEW);
            intent.setData(imageInFolder);
            context.startActivity(intent);
            return true;
        }
    }
    return false;
}

// converts the absolute path of a file to a content path
// absolute path example: /storage/emulated/0/Pictures/folderName/Image1.jpg
// content path example: content://media/external/images/media/47560
private android.net.Uri getImageContentUri(android.content.Context context, java.io.File imageFile) {
    String filePath = imageFile.getAbsolutePath();
    android.database.Cursor cursor = context.getContentResolver().query(
            android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
            new String[]{android.provider.MediaStore.Images.Media._ID},
            android.provider.MediaStore.Images.Media.DATA + "=? ",
            new String[]{filePath}, null);
    if (cursor != null && cursor.moveToFirst()) {
        int id = cursor.getInt(cursor.getColumnIndex(android.provider.MediaStore.MediaColumns._ID));
        return android.net.Uri.withAppendedPath(android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "" + id);
    } else {
        if (imageFile.exists()) {
            android.content.ContentValues values = new android.content.ContentValues();
            values.put(android.provider.MediaStore.Images.Media.DATA, filePath);
            return context.getContentResolver().insert(
                    android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
        } else {
            return null;
        }
    }
}


回答4:

Answer given by @Talha works good but it tries to open image using image app options. If you want to just refresh gallery with folder in sd card you can modify code as below for SingleMediaScanner

class SingleMediaScanner implements MediaScannerConnectionClient {

    private MediaScannerConnection mMs;
    private File mFile;

    public SingleMediaScanner(Context context, File f) {
        mFile = f;
        mMs = new MediaScannerConnection(context, this);
        mMs.connect();
    }

    public void onMediaScannerConnected() {
        mMs.scanFile(mFile.getAbsolutePath(), null);
    }

    public void onScanCompleted(String path, Uri uri) {

        mMs.disconnect();
    }

}

And in button click loop over each file you get from:

    File folder = new File(Environment.getExternalStorageDirectory().getPath()+"/aaaa/");
    allFiles = folder.listFiles();

And pass that to SingleMediaScanner one at time.

It worked in my case.



标签： android image gallery folder
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