0

デフォルトの Android ギャラリーを使用して、特定のフォルダーに画像を表示しようとしています。これを行うためのサンプル コードは 1 つしか見つかりませんでした。私はそのコードを単純化しましたが、今では非常に明確です:

public class ScanActivity extends Activity implements MediaScannerConnectionClient {

    private static final String SCAN_DIR = Environment.getExternalStorageDirectory() + File.separator + "MyFolder" + File.separator;
    private static final String FILE_TYPE="image/*";

    private String scanPath;
    private MediaScannerConnection conn;


    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        scanPath = SCAN_DIR + new File(SCAN_DIR).list()[0];

        conn = new MediaScannerConnection(getApplicationContext(), this);
        conn.connect();
    }


    @Override
    public void onMediaScannerConnected()
    {
        conn.scanFile(scanPath, FILE_TYPE);
    }


    @Override
    public void onScanCompleted(String path, Uri uri)
    {
        try
        {
            if (uri != null) 
            {
                //uri = content://media/external/images/media/11271
                Intent intent = new Intent(Intent.ACTION_VIEW);
                intent.setDataAndType(uri, FILE_TYPE);
                startActivity(intent);
            }
        }
        finally
        {
            conn.disconnect();
            conn = null;
        }
    }

}

Android Froyo (2.2)では正常に動作します - ギャラリーはMyFolderディレクトリ内のすべての画像を開きますが、Jelly Bean (4.1)では黒い画面しか表示されません (下のスクリーンショットを参照)。もちろん、スキャンしたフォルダには両方のデバイスの写真が含まれています。

スクリーンショット 4.1

logcat の出力:

11-03 18:31:31.872: W/DataManager(12540): exception in creating media object: /local/image/item/11271
11-03 18:31:31.872: W/DataManager(12540): java.lang.RuntimeException: cannot find data for: /local/image/item/11271
11-03 18:31:31.872: W/DataManager(12540):   at com.android.gallery3d.data.LocalImage.<init>(LocalImage.java:104)
11-03 18:31:31.872: W/DataManager(12540):   at com.android.gallery3d.data.LocalSource.createMediaObject(LocalSource.java:106)
11-03 18:31:31.872: W/DataManager(12540):   at com.android.gallery3d.data.DataManager.getMediaObject(DataManager.java:165)
11-03 18:31:31.872: W/DataManager(12540):   at com.android.gallery3d.data.LocalSource.getDefaultSetOf(LocalSource.java:183)
11-03 18:31:31.872: W/DataManager(12540):   at com.android.gallery3d.data.DataManager.getDefaultSetOf(DataManager.java:261)
11-03 18:31:31.872: W/DataManager(12540):   at com.android.gallery3d.app.Gallery.startViewAction(Gallery.java:198)
11-03 18:31:31.872: W/DataManager(12540):   at com.android.gallery3d.app.Gallery.initializeByIntent(Gallery.java:91)
11-03 18:31:31.872: W/DataManager(12540):   at com.android.gallery3d.app.Gallery.onCreate(Gallery.java:68)
11-03 18:31:31.872: W/DataManager(12540):   at android.app.Activity.performCreate(Activity.java:5008)
11-03 18:31:31.872: W/DataManager(12540):   at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
11-03 18:31:31.872: W/DataManager(12540):   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2140)
11-03 18:31:31.872: W/DataManager(12540):   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2211)
11-03 18:31:31.872: W/DataManager(12540):   at android.app.ActivityThread.access$600(ActivityThread.java:143)
11-03 18:31:31.872: W/DataManager(12540):   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1209)
11-03 18:31:31.872: W/DataManager(12540):   at android.os.Handler.dispatchMessage(Handler.java:99)
11-03 18:31:31.872: W/DataManager(12540):   at android.os.Looper.loop(Looper.java:137)
11-03 18:31:31.872: W/DataManager(12540):   at android.app.ActivityThread.main(ActivityThread.java:4965)
11-03 18:31:31.872: W/DataManager(12540):   at java.lang.reflect.Method.invokeNative(Native Method)
11-03 18:31:31.872: W/DataManager(12540):   at java.lang.reflect.Method.invoke(Method.java:511)
11-03 18:31:31.872: W/DataManager(12540):   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
11-03 18:31:31.872: W/DataManager(12540):   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:558)
11-03 18:31:31.872: W/DataManager(12540):   at dalvik.system.NativeStart.main(Native Method)
11-03 18:31:31.872: V/StateManager(12540): startState class com.android.gallery3d.app.PhotoPage
11-03 18:31:31.911: V/NFC(12540): this device does not have NFC support
11-03 18:31:32.044: W/DecodeService(12540): java.lang.NullPointerException
11-03 18:31:32.044: W/DecodeService(12540):     at java.io.File.fixSlashes(File.java:185)
11-03 18:31:32.044: W/DecodeService(12540):     at java.io.File.<init>(File.java:134)
11-03 18:31:32.044: W/DecodeService(12540):     at java.io.FileInputStream.<init>(FileInputStream.java:105)
11-03 18:31:32.044: W/DecodeService(12540):     at com.android.gallery3d.data.DecodeUtils.decodeThumbnail(DecodeUtils.java:92)
11-03 18:31:32.044: W/DecodeService(12540):     at com.android.gallery3d.data.LocalImage$LocalImageRequest.onDecodeOriginal(LocalImage.java:188)
11-03 18:31:32.044: W/DecodeService(12540):     at com.android.gallery3d.data.ImageCacheRequest.run(ImageCacheRequest.java:74)
11-03 18:31:32.044: W/DecodeService(12540):     at com.android.gallery3d.data.LocalImage$LocalImageRequest.run(LocalImage.java:154)
11-03 18:31:32.044: W/DecodeService(12540):     at com.android.gallery3d.data.ImageCacheRequest.run(ImageCacheRequest.java:28)
11-03 18:31:32.044: W/DecodeService(12540):     at com.android.gallery3d.util.ThreadPool$Worker.run(ThreadPool.java:124)
11-03 18:31:32.044: W/DecodeService(12540):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
11-03 18:31:32.044: W/DecodeService(12540):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
11-03 18:31:32.044: W/DecodeService(12540):     at java.lang.Thread.run(Thread.java:856)
11-03 18:31:32.044: W/DecodeService(12540):     at com.android.gallery3d.util.PriorityThreadFactory$1.run(PriorityThreadFactory.java:43)
11-03 18:31:32.044: W/ImageCacheRequest(12540): decode orig failed /local/image/item/11271,THUMB

私はグーグルで検索しましたが、この例外に関する情報は見つかりませんでした。

私はこの問題について本当に混乱しており、修正方法がわかりません。誰かがそれを修正する方法を知っていますか? ありがとう。

4

5 に答える 5

2

問題が見つかったようです。改行

conn.scanFile(scanPath, FILE_TYPE);

//what is ectualy equals to:
//conn.scanFile(scanPath, "image/*");

この行に：

conn.scanFile(scanPath, null);

問題を修正しました。よくわかりませんが、これは Android のバグのようです。

于 2012-11-05T20:39:22.733 に答える
1

ジェリービーンでも同じ問題がありました。FILE_TYPE = "image/jpeg" で解決しました

于 2013-01-03T22:26:18.833 に答える
1

このフォルダー内のすべてのファイルをスキャンするために、以下のコードを変更します。それはJBのために私のために働きます。

        public void onMediaScannerConnected()
    {
        for(File f : allFiles)
        {
            conn.scanFile(f.getAbsolutePath(), "image/*");
        }
    }
于 2013-06-06T02:49:31.510 に答える
0

同様の問題に直面しました。これを修正するために使用したコードは次のとおりです。

    public class CostumeLog extends Activity{
Integer[] imageIDs = {R.drawable.login_button, R.drawable.logout_button};
File root = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/TrickorTreater/Photos");
File[] files;
Bitmap[] bitmapArray;

@Override
public void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    setContentView(R.layout.costume_log_layout);

    root.mkdirs();

    Gallery gallery = (Gallery)findViewById(R.id.gallery1);

    if ((root.isDirectory()) && (root.exists())){
        files = root.listFiles();
        if (!files.equals(null) || !(files.length <= 0)){
            bitmapArray = new Bitmap[(files.length)];
            for (int index = 0; (index <= files.length - 1); index++){
                if (files[index] != null){
                    bitmapArray[index] = decodeSampledBitmapFromFile(files[index].toString(), 300, 240);
                }//third if
            }//for loop

            gallery.setAdapter(new ImageAdapter(this));
            gallery.setOnItemClickListener( new OnItemClickListener() {

                public void onItemClick(AdapterView parent, View v, int position, long id){
                    Intent viewImage = new Intent(CostumeLog.this, ViewLargeImage.class);
                    viewImage.putExtra("INDEX", position);
                    startActivity(viewImage);
                }
            });

        }//second if
    }//first if
}


      public class ImageAdapter extends BaseAdapter{
    Context context;
    int itemBackground;

    public ImageAdapter(Context c){
        context = c;
        TypedArray a = obtainStyledAttributes(R.styleable.Gallery1);
        itemBackground = a.getResourceId(R.styleable.Gallery1_android_galleryItemBackground, 0);
        a.recycle();
    }

    public int getCount() {

        return bitmapArray.length;
    }

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

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

    public View getView(int position, View converView, ViewGroup parent) {
        ImageView imageView;
        if (converView == null) {
            imageView = new ImageView(context);
            imageView.setImageBitmap(bitmapArray[position]);
            //imageView.setImageResource(imageIDs[position]);
            imageView.setScaleType(ImageView.ScaleType.FIT_XY);
            imageView.setLayoutParams(new Gallery.LayoutParams(300, 240));
        } else {
            imageView = (ImageView) converView;
        }
        imageView.setBackgroundResource(itemBackground);
        return imageView;
    }

}

これが役立つことを願っています

于 2012-11-03T16:54:36.393 に答える
0

私は同じものを探してここに来ましたが、今では独自のカスタム ギャラリーをデザインすることになりました。

public class ImageViewFlipper extends Activity {

private static final int EXIT = 0;
private static final int SWIPE_MIN_DISTANCE = 120;
private static final int SWIPE_MAX_OFF_PATH = 250;
private static final int SWIPE_THRESHOLD_VELOCITY = 200;
private static final String DIRECTORY = "/sdcard/edu";
private static final String DATA_DIRECTORY = "/sdcard/edu";
private static final String DATA_FILE = "/sdcard/imagelist.dat";
private GestureDetector gestureDetector;
View.OnTouchListener gestureListener;
private Animation slideLeftIn;
private Animation slideLeftOut;
private Animation slideRightIn;
private Animation slideRightOut;
private ViewFlipper viewFlipper;
private int currentView = 0;
List<String> ImageList;
private int currentIndex = 0;
private int maxIndex = 0;

FileOutputStream output = null;
OutputStreamWriter writer = null;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN);

    setContentView(R.layout.main);
    ImageView iv = (ImageView) findViewById(R.id.zero);

    File data_directory = new File(DATA_DIRECTORY);
    if (!data_directory.exists()) {
        if (data_directory.mkdir()) {
            FileUtils savedata = new FileUtils();
            Toast toast = Toast.makeText(ImageViewFlipper.this,
                    "Please wait while we search your SD Card for images...", Toast.LENGTH_SHORT);
            toast.show();
            SystemClock.sleep(100);
            ImageList = FindFiles();
            savedata.saveArray(DATA_FILE, ImageList);

        } else {
            ImageList = FindFiles();
        }

    }
    else {
        File data_file= new File(DATA_FILE);
        if (!data_file.exists()) {
            FileUtils savedata = new FileUtils();


            SystemClock.sleep(100);
            ImageList = FindFiles();
            savedata.saveArray(DATA_FILE, ImageList);
        } else {
            FileUtils readdata = new FileUtils();
            ImageList = readdata.loadArray(DATA_FILE);
        }
    }

    if (ImageList == null) {
        quit();
    }

    SharedPreferences indexPrefs = getSharedPreferences("currentIndex",
            MODE_PRIVATE);
    if (indexPrefs.contains("currentIndex")) {
        currentIndex = indexPrefs.getInt("currentIndex", 0);
    }

    maxIndex = ImageList.size() - 1;

    Log.v("currentIndex", "Index: "+currentIndex);

    viewFlipper = (ViewFlipper) findViewById(R.id.flipper);

    slideLeftIn = AnimationUtils.loadAnimation(this, R.anim.slide_left_in);
    slideLeftOut = AnimationUtils
            .loadAnimation(this, R.anim.slide_left_out);
    slideRightIn = AnimationUtils
            .loadAnimation(this, R.anim.slide_right_in);
    slideRightOut = AnimationUtils.loadAnimation(this,
            R.anim.slide_right_out);

    viewFlipper.setInAnimation(AnimationUtils.loadAnimation(this,
            android.R.anim.fade_in));
    viewFlipper.setOutAnimation(AnimationUtils.loadAnimation(this,
            android.R.anim.fade_out));

    iv.setImageDrawable(Drawable.createFromPath(ImageList
            .get(currentIndex)));
    System.gc();

    gestureDetector = new GestureDetector(new MyGestureDetector());
    gestureListener = new View.OnTouchListener() {
        public boolean onTouch(View v, MotionEvent event) {
            if (gestureDetector.onTouchEvent(event)) {
                return true;
            }
            return false;
        }
    };

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    super.onCreateOptionsMenu(menu);

    int NONE = Menu.NONE;
    menu.add(NONE, EXIT, NONE, "Exit");
    return true;
}

public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
    case EXIT:
        quit();
        break;
    }

    return super.onOptionsItemSelected(item);
}

protected void onPause() {
    super.onPause();

    SharedPreferences indexPrefs = getSharedPreferences("currentIndex",
            MODE_PRIVATE);

    SharedPreferences.Editor indexEditor = indexPrefs.edit();
    indexEditor.putInt("currentIndex", currentIndex);
    indexEditor.commit();
}

protected void onResume() {
    super.onResume();
    SharedPreferences indexPrefs = getSharedPreferences("currentIndex",
            MODE_PRIVATE);
    if (indexPrefs.contains("currentIndex")) {
        currentIndex = indexPrefs.getInt("currentIndex", 0);
    }   
}

private List<String> FindFiles() {
    final List<String> tFileList = new ArrayList<String>();
    Resources resources = getResources();
    // array of valid image file extensions
    String[] imageTypes = resources.getStringArray(R.array.image);
    FilenameFilter[] filter = new FilenameFilter[imageTypes.length];

    int i = 0;
    for (final String type : imageTypes) {
        filter[i] = new FilenameFilter() {
            public boolean accept(File dir, String name) {
                return name.endsWith("." + type);
            }
        };
        i++;
    }

    FileUtils fileUtils = new FileUtils();
    File[] allMatchingFiles = fileUtils.listFilesAsArray(
            new File(DIRECTORY), filter, -1);
    for (File f : allMatchingFiles) {
        tFileList.add(f.getAbsolutePath());
    }
    return tFileList;
}

public class FileUtils {

    public void saveArray(String filename, List<String> output_field) {
         try {
            FileOutputStream fos = new FileOutputStream(filename);
            GZIPOutputStream gzos = new GZIPOutputStream(fos);
            ObjectOutputStream out = new ObjectOutputStream(gzos);
            out.writeObject(output_field);
            out.flush();
            out.close();
         }
         catch (IOException e) {
             e.getStackTrace(); 
         }
      }

      @SuppressWarnings("unchecked")
    public List<String> loadArray(String filename) {
          try {
            FileInputStream fis = new FileInputStream(filename);
            GZIPInputStream gzis = new GZIPInputStream(fis);
            ObjectInputStream in = new ObjectInputStream(gzis);
            List<String> read_field = (List<String>)in.readObject();
            in.close();
            return read_field;
          }
          catch (Exception e) {
              e.getStackTrace();
          }
          return null;
      }

    public File[] listFilesAsArray(File directory, FilenameFilter[] filter,
            int recurse) {
        Collection<File> files = listFiles(directory, filter, recurse);

        File[] arr = new File[files.size()];
        return files.toArray(arr);
    }

    public Collection<File> listFiles(File directory,
            FilenameFilter[] filter, int recurse) {

        Vector<File> files = new Vector<File>();

        File[] entries = directory.listFiles();

        if (entries != null) {
            for (File entry : entries) {
                for (FilenameFilter filefilter : filter) {
                    if (filter == null
                            || filefilter
                                    .accept(directory, entry.getName())) {
                        files.add(entry);
                        Log.v("ImageViewFlipper", "Added: "
                                + entry.getName());
                    }
                }
                if ((recurse <= -1) || (recurse > 0 && entry.isDirectory())) {
                    recurse--;
                    files.addAll(listFiles(entry, filter, recurse));
                    recurse++;
                }
            }
        }
        return files;
    }
}

class MyGestureDetector extends SimpleOnGestureListener {
    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
            float velocityY) {
        try {
            if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
                return false;
            // right to left swipe
            if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE
                    && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                viewFlipper.setInAnimation(slideLeftIn);
                viewFlipper.setOutAnimation(slideLeftOut);

                if (currentIndex == maxIndex) {
                    currentIndex = 0;
                } else {
                    currentIndex = currentIndex + 1;
                }
                if (currentView == 0) {
                    currentView = 1;
                    ImageView iv = (ImageView) findViewById(R.id.one);
                    iv.setImageDrawable(Drawable.createFromPath(ImageList
                            .get(currentIndex)));
                    System.gc();
                } else if (currentView == 1) {
                    currentView = 2;
                    ImageView iv = (ImageView) findViewById(R.id.two);
                    iv.setImageDrawable(Drawable.createFromPath(ImageList
                            .get(currentIndex)));
                    System.gc();
                } else {
                    currentView = 0;
                    ImageView iv = (ImageView) findViewById(R.id.zero);
                    iv.setImageDrawable(Drawable.createFromPath(ImageList
                            .get(currentIndex)));
                    System.gc();
                }
                Log.v("ImageViewFlipper", "Current View: " + currentView);
                viewFlipper.showNext();
            } else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE
                    && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                viewFlipper.setInAnimation(slideRightIn);
                viewFlipper.setOutAnimation(slideRightOut);
                if (currentIndex == 0) {
                    currentIndex = maxIndex;
                } else {
                    currentIndex = currentIndex - 1;
                }
                if (currentView == 0) {
                    currentView = 2;
                    ImageView iv = (ImageView) findViewById(R.id.two);
                    iv.setImageDrawable(Drawable.createFromPath(ImageList
                            .get(currentIndex)));
                } else if (currentView == 2) {
                    currentView = 1;
                    ImageView iv = (ImageView) findViewById(R.id.one);
                    iv.setImageDrawable(Drawable.createFromPath(ImageList
                            .get(currentIndex)));
                } else {
                    currentView = 0;
                    ImageView iv = (ImageView) findViewById(R.id.zero);
                    iv.setImageDrawable(Drawable.createFromPath(ImageList
                            .get(currentIndex)));
                }
                Log.v("ImageViewFlipper", "Current View: " + currentView);
                viewFlipper.showPrevious();
            }
        } catch (Exception e) {
            // nothing
        }
        return false;
    }
}

@Override
public boolean onTouchEvent(MotionEvent event) {
    if (gestureDetector.onTouchEvent(event))
        return true;
    else
        return false;
}

public void quit() {
    SharedPreferences indexPrefs = getSharedPreferences("currentIndex",
            MODE_PRIVATE);

    SharedPreferences.Editor indexEditor = indexPrefs.edit();
    indexEditor.putInt("currentIndex", 0);
    indexEditor.commit(); 
    File settings = new File(DATA_FILE);
    settings.delete();
    finish();
    int pid = android.os.Process.myPid();
    android.os.Process.killProcess(pid);
    System.exit(0);
}

}

      Dont forget: (Manifest)  
      android:configChanges="orientation"
于 2013-01-04T11:43:21.317 に答える