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我在我的應用程序中使用了ViewFlow示例的實現，其中我必須從SdCard中滑動圖像。隨着我使用的代碼我可以滑動圖像，但它只顯示一個，我試圖從我的SD卡特定文件夾中設置ViewFlow整個圖像，但這是我的問題。我通過從sqlite數據庫獲取的ID獲取圖像的路徑，並根據我想將這些圖像添加到視圖中。所以這是我使用的，現在它的代碼：Android VeiwFlow從SdCard中加載圖像
我Cards.class：
package com.stampii.stampii.cards;
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.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;
ArrayList<HashMap<Integer, String>> imgpaths;
ArrayList<Integer> ids;
String path;
int mediaType=5001;
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);
imgpaths = new ArrayList<HashMap<Integer, String>>();
HashMap<Integer, String> hm = new HashMap<Integer, String>();
ids = new ArrayList<Integer>();
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.cardId, cm.objectId "+
"FROM cardmedias AS cm "+
"INNER JOIN cards AS cd "+
"ON (cm.cardId = cd.objectId) "+
"WHERE cd.collectionId="+collId +" AND cm.mediaType="+mediaType;
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);
ids.add(cardsId);
hm.put(cardsId, 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) {
cursor.moveToFirst();
objectId = Integer.parseInt(cursor.getString(cursor
.getColumnIndex("objectId")));
Log.i("", "objectId : " + objectId);
path = hm.get(objectId);
Log.i("","path : "+hm.get(objectId));
Log.i("","hm size : "+hm.size());
}
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>();
for(int i=0;i<=2;i++){
BitmapFactory.Options options = new BitmapFactory.Options();
options.inTempStorage = new byte[16*1024];
Bitmap b = BitmapFactory.decodeFile(hm.get(objectId), options);
Log.i("","path : "+hm.get(objectId));
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);
}
}
而且我ImageAdapter類：
package com.stampii.stampii.cards;
import java.util.ArrayList;
import com.stampii.stampii.R;
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 ids.size();
}
@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;
}
}
所以我的問題是如何當我擁有這些圖像的路徑時，可以將我的SdCard文件夾中的所有圖像添加到此ViewFlow示例中。我試圖加載所有這些圖片，但在某些情況下，圖片太多了，它會拋出一個outofmemoryException，這就是爲什麼我認爲只爲它們設置路徑更好。所以歡迎任何幫助或建議！
在此先感謝！
這裏是ViewFlow.class代碼：ViewFlow