Question

我想知道如何在eclipse中获取存储在drawable文件夹中的图像的imagePath。 imagePath将存储在SQLite数据库中。所以现在我想知道如何在数据库中检索imagePath的Uri。任何帮助将不胜感激。谢谢。

ImagePage.java

package main.page;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;

import android.app.Activity;
import android.os.Bundle;
import android.content.Context;
import android.content.Intent;
import android.content.res.TypedArray;
import android.database.Cursor;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.Gallery;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.Toast;

public class ImagesPage extends Activity 
{
    Integer[] imageIDs = {R.drawable.pic1, R.drawable.pic2, R.drawable.pic3, R.drawable.pic4};
    ImageAdapter imgDB = new ImageAdapter(this);

    ArrayList<String> imageNames = new ArrayList<String>();

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

        Button btnNext = (Button)findViewById(R.id.buttonNext);
        btnNext.setOnClickListener(new View.OnClickListener()
        {

            @Override
            public void onClick(View arg0)
            {
            Intent i = new Intent(ImagesPage.this, ImagesSecondpage.class);
            startActivity(i);

            }
        });


        GridView gridView = (GridView)findViewById(R.id.gridview);
        gridView.setAdapter(new ImgAdapter(this));      

        gridView.setOnItemClickListener(new OnItemClickListener()
        {

                @Override
                public void onItemClick(AdapterView<?> parent, View v,
                        int position, long id)
                {
                    imgDB.open();
                    long _id = imgDB.insertImage("pic" + (position + 1)+ ".jpg");

                    imgDB.close();
                }
        }); 
    }

    public class ImgAdapter extends BaseAdapter
      {
          private Context context;

          public ImgAdapter(Context c)
          {
              context = c;

          }


        @Override
        public int getCount()
        {
        return imageIDs.length;
        }

        @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)
        {
          ImageView imageView;
          if(convertView == null)
          {
              imageView = new ImageView(context);
              imageView.setImageResource(getResources().getIdentifier(imageNames.get(position), defType, defPackage))
              imageView.setLayoutParams(new GridView.LayoutParams(85,85));
              imageView.setScaleType(ImageView.ScaleType.FIT_XY);
              imageView.setPadding(5, 5, 5, 5);

          }else
          {
              imageView = (ImageView) convertView;
          }
            imageView.setImageResource(imageIDs[position]);
            return imageView;


        }

     }

}

ImageAdapter.java

    package main.page;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;

public class ImageAdapter
{
    public static final String KEY_ROWID = "_id";
    public static final String KEY_NAME = "img_name";
    private static final String TAG = "DBAdapter";

    private static final String DATABASE_NAME = "anniversary";
    private static final String DATABASE_TABLE = "image";
    private static final int DATABASE_VERSION = 1;

    private static final String DATABASE_CREATE = "create table image (_id integer primary key autoincrement, "+ "img_name text not null);";
    private final Context context;

    private DatabaseHelper DBHelper;
    private SQLiteDatabase db;

    public ImageAdapter(Context ctx)
    {
        this.context = ctx;
        DBHelper = new DatabaseHelper(context);
    }

    private static class DatabaseHelper extends SQLiteOpenHelper
    {
        DatabaseHelper(Context context)
        {
            super(context, DATABASE_NAME, null, DATABASE_VERSION);

        }

        @Override
        public void onCreate(SQLiteDatabase db)
        {
          try
          {
            db.execSQL(DATABASE_CREATE);
          }catch(SQLException e)
          {
              e.printStackTrace();
          }

        }

        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
        {
            Log.w(TAG, "Upgrading database from version" +oldVersion + "to" + newVersion +", which will destroy all old data");
            db.execSQL("DROP TABLE IF EXISTS image");
            onCreate(db);   
        }



    }


    public ImageAdapter open() throws SQLException
    {
        db = DBHelper.getReadableDatabase();
        return this;
    }

    public void close()
    {
        DBHelper.close();
    }

    public long insertImage(String img_name)
    {
        ContentValues initialValues = new ContentValues();
        initialValues.put(KEY_NAME, img_name);
        return db.insert(DATABASE_TABLE, null, initialValues);
    }

    public boolean deleteImage(long rowId)
    {
        return db.delete(DATABASE_TABLE, KEY_ROWID +"="+ rowId, null) > 0;
    }

    public Cursor getAllImages()
    {
        return db.query(DATABASE_TABLE, new String[] {KEY_ROWID, KEY_NAME}, null, null, null, null, null);
    }

    public Cursor getImage(long rowId) throws SQLException
    {
        Cursor mCursor = db.query(true, DATABASE_TABLE, new String[] {KEY_ROWID, KEY_NAME}, KEY_ROWID +"="+ rowId, null, null, null, null, null);
        if(mCursor != null)
        {
            mCursor.moveToFirst();
        }
        return mCursor;
    }

    public boolean updateImage(long rowId, String img_name)
    {
        ContentValues args = new ContentValues();
        args.put(KEY_NAME, img_name);
        return db.update(DATABASE_TABLE, args, KEY_ROWID +"="+ rowId, null) > 0;
    }

}

我再次更新了ImagePage.java的编码。

Answer 1

String path = getResources().getString(R.drawable.icon);

Answer 2

任何图像资源都应该放在drawable中，所以它不是关于路径你只需要将图像名称保存在与某个实体相关的数据库中，通过从数据库获取它可以通过下面的代码获取图像资源

Bitmap image = BitmapFactory.decodeResource(getResources(), getResources().getIdentifier( "imagename" , "drawable", getPackageName()));

<强>更新

现在从您的代码根据问题您尝试通过名称（路径）获取图像意味着您希望图像资源通过数据库指向而不是整数数组Integer[] imageIDs = {R.drawable.pic1, R.drawable.pic2, R.drawable.pic3, R.drawable.pic4};，所以首先要做到这一点一旦通过查询得到名称，您在数据库中的表的列中保存所有图像名称（与可绘制文件夹中的图像名称相同的名称），而不是通过整数数组引用只是数据库中的名称将允许您访问来自drawables的图像资源，我假设图像名称按照以下方式存储ArrayList<String> imageNames = new ArrayList<String>(); //hence in the while loop of cursor during retriving values from cursor imageNames.add(cursor.getString(columnIndex));

所以更新的代码将在下面的地方

@Override
        public View getView(int position, View convertView ,ViewGroup parent)
        {
            ImageView imageView = new ImageView(context);
            imageView.setImageResource(getResources().getIdentifier(imageNames.get(position), "drawable", this.getPackageName()));
            imageView.setScaleType(ImageView.ScaleType.FIT_XY);
            imageView.setLayoutParams(new Gallery.LayoutParams(150, 120));
            imageView.setBackgroundResource(itemBackground);


            return imageView;
        }

如果你仍然感到困惑，那么我认为我无法做其他解决方案

将图像存储在可绘制文件夹中，并使用数据库中的imagePath加载图像

2 个答案: