Android Viewflow Проведите изображения с SDCard

Question

Я работаю над проектом, который сохраняет некоторые изображения на SDCard, и теперь мне нужно создать viewflow, чтобы показать эти изображения. Я получаю изображения по его идентификатору из sdCard, и теперь моя проблема в том, как пролистывать разные изображения. Вот код, который я использую:

import java.io.File;
import java.util.ArrayList;

import android.app.Activity;
import android.content.Intent;
import android.content.res.Configuration;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageButton;

public class Cards extends Activity {

    public Cursor cursor;
    int position;
    int indexxx;
    Bitmap b;
    int objectId;
    int cardsId;

    private ViewFlow viewFlow;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.circle_layout); 
        UserDatabaseHelper userDbHelper = new UserDatabaseHelper(this, null, 1);
        userDbHelper.initialize(this);


        final int cardId = getIntent().getIntExtra("card_id",0);
        Log.i("Card Id ","Card Id : "+cardId);
        final int collId = getIntent().getIntExtra("collection_id",0);
        Log.i("Collection Id ","Collection Id : "+collId);

        position = getIntent().getIntExtra("position",0);
        Log.i("position","position : "+position);

        String cardSQL = "SELECT cm.objectId "+
         "FROM cardmedias AS cm "+
         "INNER JOIN cards AS cd "+
         "ON (cm.cardId = cd.objectId) "+
         "WHERE cd.collectionId="+collId;

        Cursor cards = userDbHelper.executeSQLQuery(cardSQL);
        if (cards.getCount() == 0) {
            Log.i("", "No Image file");
            cards.close();
        } else if (cards.getCount() > 0) {
            for (cards.move(0); cards.moveToNext(); cards.isAfterLast()) {
                cardsId = Integer.parseInt(cards.getString(cards
                        .getColumnIndex("objectId")));
                Log.i("", "cards objectId : " + cardsId);

                String path = Environment.getExternalStorageDirectory()
                        + "/.Stampii/MediaCard/" + cardsId + ".png";
                Log.i("", "path : " + path);
            }
        }

        String sql = "SELECT objectId FROM cardmedias WHERE cardId=" + cardId
                + " LIMIT 1";
        Cursor cursor = userDbHelper.executeSQLQuery(sql);
        if (cursor.getCount() == 0) {
            Log.i("", "No Image file");
            cursor.close();
        } else if (cursor.getCount() > 0) {
            for (cursor.move(0); cursor.moveToNext(); cursor.isAfterLast()) {
                objectId = Integer.parseInt(cursor.getString(cursor
                        .getColumnIndex("objectId")));
                Log.i("", "objectId : " + objectId);
            }
        }



        Button info = (Button) findViewById(R.id.info_button);
        info.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                Intent intent = new Intent(Cards.this, SingleCardInfo.class);
                intent.putExtra("card_id", cardId);
                intent.putExtra("collection_id", collId);
                startActivity(intent);
            }
        });

        Button back = (Button) findViewById(R.id.back_button);
        back.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                finish();
            }
        });

        final ArrayList<Bitmap> images = new ArrayList<Bitmap>();
        String path = Environment.getExternalStorageDirectory()+"/.Stampii/MediaCard/"+objectId+".png";

        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inTempStorage = new byte[16*1024];

        Bitmap b = BitmapFactory.decodeFile(path, options);
        images.add(b);

        viewFlow = (ViewFlow) findViewById(R.id.viewflow);
        viewFlow.setAdapter(new ImageAdapter(this, images),position);


        ImageButton prevBtn = (ImageButton) findViewById(R.id.previous_button);
        prevBtn.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                indexxx = viewFlow.getSelectedItemPosition()-1;
                if (indexxx>=0) {
                    viewFlow.setAdapter(new ImageAdapter(Cards.this, images),indexxx);
                    viewFlow.setSelectedItemPosition(indexxx);
                    Log.i("indexxx", "indexxx : " + indexxx);
                }
            }
        });

        ImageButton nextBtn = (ImageButton) findViewById(R.id.next_button);
        nextBtn.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                indexxx = viewFlow.getSelectedItemPosition()+1;
                if (indexxx<=images.size()) {
                    viewFlow.setAdapter(new ImageAdapter(Cards.this, images),indexxx);
                    viewFlow.setSelectedItemPosition(indexxx);
                    Log.i("indexxx", "indexxx : " + indexxx);
                }
            }
        }); 

    }
    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        viewFlow.onConfigurationChanged(newConfig);
    }

}

И вот мой класс ImageAdapter:

import java.util.ArrayList;

import android.content.Context;
import android.graphics.Bitmap;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;

public class ImageAdapter extends BaseAdapter {

    private LayoutInflater mInflater;
    private ArrayList<Bitmap> ids = new ArrayList<Bitmap>();
    private Bitmap bitmap;

    public ImageAdapter(Context context, ArrayList<Bitmap> images) {
        mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        ids = images;
    }

    @Override
    public int getCount() {
        return 1;
    }

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

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        if (convertView == null) {
            convertView = mInflater.inflate(R.layout.image_item, null);
        }
        ((ImageView) convertView.findViewById(R.id.imgView)).setImageBitmap(ids.get(position));
        return convertView;
    }

}

Любая идея, как я могу установить следующее или предыдущее изображение, получив его идентификатор из базы данных, найдя изображение с этим именем и добавив его в viewflow и проведите пальцем. Я не хочу, чтобы кто-то писал код вместо меня... Я застрял в идее, как я могу это сделать... Так что, если кто-то может помочь мне с предложениями, идеями или чем-то еще, просто снимайте его.

Заранее спасибо!

Answer 1

Вот как я решаю эту проблему:

import java.util.ArrayList;
import java.util.HashMap;

import com.stampii.stampii.R;
import com.stampii.stampii.comm.rpc.UserDatabaseHelper;

import android.app.Activity;
import android.content.Intent;
import android.content.res.Configuration;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageButton;

public class Cards extends Activity {

    public Cursor cursor;
    int indexxx;
    Bitmap b;
    int objectId;
    int cardsId;
    ArrayList<Integer> ids;
    String path;
    int mediaType = 5001;
    ArrayList<String> images;
    int card;
    String cardSQL;

    private ViewFlow viewFlow;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.circle_layout);
        UserDatabaseHelper userDbHelper = new UserDatabaseHelper(this, null, 1);
        userDbHelper.initialize(this);
        HashMap<Integer, String> hm = new HashMap<Integer, String>();
        ids = new ArrayList<Integer>();
        images = new ArrayList<String>();

        /*
         * Card ID - Getting the right card
         */
        final int cardId = getIntent().getIntExtra("card_id", 0);
        Log.i("Card Id ", "Card Id CARDS : " + cardId);

        /*
         * Collection ID - Getting the right Collection Cards
         */
        final int collId = getIntent().getIntExtra("collection_id", 0);
        Log.i("Collection Id ", "Collection Id : " + collId);

        // Position of Clicked Item
        int position = getIntent().getIntExtra("position", 0);
        Log.i("position", "position : " + position);

        /*
         * Indicating which activity is opening this one for selecting the right
         * cards from Database. Value 1 : All Stampii - listing all owned
         * stampii cards Value 2 : Owned Stampii - listing all owned stampii
         * cards Value 3 : Repeated Stampii - listing only repeated stampii
         * cards Value 4 : Last Acquired - listing the last acquired stampii
         * cards
         */
        int activity = getIntent().getIntExtra("activity", 1);
        Log.d("", "activity : " + activity);

        /*
         * Indicating the Sort Type : Value 1 : Sort by Tags Value 2 : Sort by
         * Categories Value 3 : Sort by Date
         * By Default the sort type is by Tags! (Bad-Ass Muthaphucka)
         */
        int sort = getIntent().getIntExtra("sort_type", 1);
        Log.d("", "sort type : " + sort);

        int extra = getIntent().getIntExtra("extra", 0);
        Log.d("", "extra : " + extra);

        switch (activity) {
        case 1: // All Stampii
                cardSQL = getOwnedCards(sort, collId, extra);
            break;
        case 2: // Owned Stampii
                cardSQL = getOwnedCards(sort, collId, extra);
            break;
        case 3: // Repeated Stampii
                cardSQL = getRepeatedCards(sort, collId, extra);
            break;
        case 4: // Last Acquired
                cardSQL = getOwnedCards(sort, collId, extra);
            break;
        }

        Cursor cards = userDbHelper.executeSQLQuery(cardSQL);
        if (cards.getCount() == 0) {
            cards.close();
        } else if (cards.getCount() > 0) {
            for (cards.move(0); cards.moveToNext(); cards.isAfterLast()) {
                cardsId = Integer.parseInt(cards.getString(cards
                        .getColumnIndex("objectId")));

                card = Integer.parseInt(cards.getString(cards
                        .getColumnIndex("cardId")));

                String path = Environment.getExternalStorageDirectory()
                        + "/.Stampii/MediaCard/" + cardsId + ".png";
                ids.add(card);
                hm.put(cardsId, path);

                path = hm.get(cardsId);
                images.add(path);
            }
        }

        Button back = (Button) findViewById(R.id.back_button);
        back.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                finish();
            }
        });

        viewFlow = (ViewFlow) findViewById(R.id.viewflow);
        viewFlow.setAdapter(new ImageAdapter(this, images), position);

        ImageButton prevBtn = (ImageButton) findViewById(R.id.previous_button);
        prevBtn.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                indexxx = viewFlow.getSelectedItemPosition() - 1;
                if (indexxx >= 0) {
                    viewFlow.setAdapter(new ImageAdapter(Cards.this, images),
                            indexxx);
                    viewFlow.setSelectedItemPosition(indexxx);
                    Log.i("indexxx", "indexxx : " + indexxx);
                }
            }
        });

        ImageButton nextBtn = (ImageButton) findViewById(R.id.next_button);
        nextBtn.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                indexxx = viewFlow.getSelectedItemPosition() + 1;
                if (indexxx < images.size()) {
                    viewFlow.setAdapter(new ImageAdapter(Cards.this, images),
                            indexxx);
                    viewFlow.setSelectedItemPosition(indexxx);
                    Log.i("indexxx", "indexxx : " + indexxx);
                }
            }
        });

        Button info = (Button) findViewById(R.id.info_button);
        info.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                Intent intent = new Intent(Cards.this, SingleCardInfo.class);
                intent.putExtra("card_id",
                        ids.get(viewFlow.getSelectedItemPosition()));
                intent.putExtra("collection_id", collId);
                startActivity(intent);
            }
        });
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        viewFlow.onConfigurationChanged(newConfig);
    }

    public String getOwnedCards(int sort, int collId, int extra) {
        String sql = "";
        switch (sort) {
        case 1: // Sort by Tags
            if (extra != 0)
                sql = "SELECT DISTINCT cm.cardId, cm.objectId "
                        + "FROM cardmedias AS cm " + "INNER JOIN cards AS cd "
                        + "ON (cm.cardId = cd.objectId) "
                        + "INNER JOIN cardtags AS ct "
                        + "ON (cd.objectId = ct.cardId) "
                        + "INNER JOIn tags AS tg "
                        + "ON (tg.objectId = ct.tagId) "
                        + "WHERE cd.collectionId=" + collId
                        + " AND cm.mediaType=" + mediaType
                        + " AND tg.objectId=" + extra;
            else if (extra == 0)
                sql = "SELECT DISTINCT cm.cardId, cm.objectId "
                        + "FROM cardmedias AS cm " + "INNER JOIN cards AS cd "
                        + "ON (cm.cardId = cd.objectId) "
                        + "INNER JOIN cardtags AS ct "
                        + "ON (cd.objectId = ct.cardId) "
                        + "INNER JOIn tags AS tg "
                        + "ON (tg.objectId = ct.tagId) "
                        + "WHERE cd.collectionId=" + collId
                        + " AND cm.mediaType=" + mediaType;
            break;
        case 2: // Sort by Categories
            if (extra != 0)
                sql = "SELECT DISTINCT cm.cardId, cm.objectId "
                    + "FROM cardmedias AS cm " + "INNER JOIN cards AS cd "
                    + "ON (cm.cardId = cd.objectId) "
                    + "INNER JOIN categories AS cats "
                    + "ON (cd.categoryId = cats.objectId) "
                    + "WHERE cd.collectionId=" + collId
                    + " AND cm.mediaType=" + mediaType
                    + " AND cats.objectId=" + extra;
            else if (extra == 0)
                sql = "SELECT DISTINCT cm.cardId, cm.objectId "
                    + "FROM cardmedias AS cm " + "INNER JOIN cards AS cd "
                    + "ON (cm.cardId = cd.objectId) "
                    + "INNER JOIN categories AS cats "
                    + "ON (cd.categoryId = cats.objectId) "
                    + "WHERE cd.collectionId=" + collId
                    + " AND cm.mediaType=" + mediaType;
            break;
        case 3: // Sort by Date
            String ASCDESC = getIntent().getStringExtra("ascdesc");
            if (extra != 0)
                sql = "SELECT DISTINCT cm.cardId, cm.objectId "
                    + "FROM cardmedias AS cm " + "INNER JOIN cards AS cd "
                    + "ON (cm.cardId = cd.objectId) "
                    + "INNER JOIN categories AS cats "
                    + "ON (cd.categoryId = cats.objectId) "
                    + "WHERE cd.collectionId=" + collId
                    + " AND cm.mediaType=" + mediaType
                    + " ORDER BY cd.dateCreated " + ASCDESC;
            else if (extra == 0)
                sql = "SELECT DISTINCT cm.cardId, cm.objectId "
                    + "FROM cardmedias AS cm " + "INNER JOIN cards AS cd "
                    + "ON (cm.cardId = cd.objectId) "
                    + "INNER JOIN categories AS cats "
                    + "ON (cd.categoryId = cats.objectId) "
                    + "WHERE cd.collectionId=" + collId
                    + " AND cm.mediaType=" + mediaType;
            break;
        }
        return sql;
    }

    public String getRepeatedCards(int sort, int collId, int extra){
        String sql="";
        switch (sort) {
        case 1: // Sort by Tags
            if (extra != 0)
                sql = "SELECT DISTINCT cm.cardId, cm.objectId "
                        + "FROM cardmedias AS cm " + "INNER JOIN cards AS cd "
                        + "ON (cm.cardId = cd.objectId) "
                        + "INNER JOIN cardtags AS ct "
                        + "ON (cd.objectId = ct.cardId) "
                        + "INNER JOIn tags AS tg "
                        + "ON (tg.objectId = ct.tagId) "
                        + "WHERE cd.collectionId=" + collId
                        + " AND cd.repeatsCount>1"
                        + " AND cm.mediaType=" + mediaType
                        + " AND tg.objectId=" + extra;
            else if (extra == 0)
                sql = "SELECT DISTINCT cm.cardId, cm.objectId "
                        + "FROM cardmedias AS cm " + "INNER JOIN cards AS cd "
                        + "ON (cm.cardId = cd.objectId) "
                        + "INNER JOIN cardtags AS ct "
                        + "ON (cd.objectId = ct.cardId) "
                        + "INNER JOIn tags AS tg "
                        + "ON (tg.objectId = ct.tagId) "
                        + "WHERE cd.collectionId=" + collId
                        + " AND cd.repeatsCount>1"
                        + " AND cm.mediaType=" + mediaType;
            break;
        case 2: // Sort by Categories
            if (extra != 0)
                sql = "SELECT DISTINCT cm.cardId, cm.objectId "
                    + "FROM cardmedias AS cm " + "INNER JOIN cards AS cd "
                    + "ON (cm.cardId = cd.objectId) "
                    + "INNER JOIN categories AS cats "
                    + "ON (cd.categoryId = cats.objectId) "
                    + "WHERE cd.collectionId=" + collId
                    + " AND cd.repeatsCount>1"
                    + " AND cm.mediaType=" + mediaType
                    + " AND cats.objectId=" + extra;
            else if (extra == 0)
                sql = "SELECT DISTINCT cm.cardId, cm.objectId "
                    + "FROM cardmedias AS cm " + "INNER JOIN cards AS cd "
                    + "ON (cm.cardId = cd.objectId) "
                    + "INNER JOIN categories AS cats "
                    + "ON (cd.categoryId = cats.objectId) "
                    + "WHERE cd.collectionId=" + collId
                    + " AND cd.repeatsCount>1"
                    + " AND cm.mediaType=" + mediaType;
            break;
        case 3: // Sort by Date
            String ASCDESC = getIntent().getStringExtra("ascdesc");
            Log.d("","ASCDESC : "+ASCDESC);
            if (extra != 0)
                sql = "SELECT DISTINCT cm.cardId, cm.objectId "
                    + "FROM cardmedias AS cm " + "INNER JOIN cards AS cd "
                    + "ON (cm.cardId = cd.objectId) "
                    + "INNER JOIN categories AS cats "
                    + "ON (cd.categoryId = cats.objectId) "
                    + "WHERE cd.collectionId=" + collId
                    + " AND cd.repeatsCount>1"
                    + " AND cm.mediaType=" + mediaType
                    + " ORDER BY cd.dateCreated " + ASCDESC;
            else if (extra == 0)
                sql = "SELECT DISTINCT cm.cardId, cm.objectId "
                    + "FROM cardmedias AS cm " + "INNER JOIN cards AS cd "
                    + "ON (cm.cardId = cd.objectId) "
                    + "INNER JOIN categories AS cats "
                    + "ON (cd.categoryId = cats.objectId) "
                    + "WHERE cd.collectionId=" + collId
                    + " AND cd.repeatsCount>1"
                    + " AND cm.mediaType=" + mediaType;
            break;
        }
        return sql;
    }

}

Answer 2

Я думаю, вы достаточно близки к тому, чтобы заставить его работать.

getCount() должно быть так:

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

ИЗДАНО:
Вы должны создать только один экземпляр ImageAdapterвы создаете новые экземпляры внутри onClick, Также вы должны использовать setSelection() вместо setSelectedItemPosition(), Кажется, последний предназначен для внутреннего:

        @Override
        public void onClick(View v) {
            indexxx = viewFlow.getSelectedItemPosition()-1;
            if (indexxx>=0) {
                viewFlow.setSelection(indexxx);
                Log.i("indexxx", "indexxx : " + indexxx);
            }
        }
        /* ... */
        @Override
        public void onClick(View v) {
            indexxx = viewFlow.getSelectedItemPosition()+1;
            if (indexxx<images.size()) { // Should be <, you have a wrong boundary check here!!!
                viewFlow.setSelection(indexxx);
                Log.i("indexxx", "indexxx : " + indexxx);
            }
        }