Android Open Source - droidengine2d Assets Loader

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License

The source code is released under:

Apache License

Java Source Code

/*   Copyright 2013-2014 Miguel Vicente Linares
 *// ww w .  ja  v  a2 s .  co m
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package com.miviclin.droidengine2d.resources;

import java.io.IOException;
import java.io.InputStream;

import android.content.Context;
import android.content.res.AssetFileDescriptor;
import android.content.res.AssetManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;

import com.miviclin.droidengine2d.util.math.Vector2;

/**
 * Utility class that can be used to load resources.
 * 
 * @author Miguel Vicente Linares
 * 
 */
public class AssetsLoader {

  /**
   * Private constructor. This class should not be instantiable.
   */
  private AssetsLoader() {

  }

  /**
   * Returns an opened InputStream to read the specified asset.
   * 
   * @param context Context.
   * @param path File path. Relative to the assets folder.
   * @return InputStream
   * @throws IOException
   */
  public static InputStream getAsset(Context context, String path) throws IOException {
    return context.getAssets().open(path);
  }

  /**
   * Returns an opened InputStream to read the specified asset.
   * 
   * @param assetManager AssetManager.
   * @param path File path. Relative to the assets folder.
   * @return InputStream
   * @throws IOException
   */
  public static InputStream getAsset(AssetManager assetManager, String path) throws IOException {
    return assetManager.open(path);
  }

  /**
   * Loads a Bitmap from the assets folder.
   * 
   * @param context Context.
   * @param path File path. Relative to the assets folder.
   * @return Bitmap
   */
  public static Bitmap loadBitmap(Context context, String path) {
    Bitmap bitmap = null;
    InputStream in = null;
    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inScaled = false;
    try {
      in = getAsset(context, path);
      bitmap = BitmapFactory.decodeStream(in, null, options);
    } catch (IOException e) {
      throw new RuntimeException("Unable to load '" + path + "'", e);
    } finally {
      if (in != null) {
        try {
          in.close();
        } catch (IOException e) {
        }
      }
    }
    return bitmap;
  }

  /**
   * Loads a Bitmap from the assets folder.
   * 
   * @param assetManager AssetManager.
   * @param path File path. Relative to the assets folder.
   * @return Bitmap
   */
  public static Bitmap loadBitmap(AssetManager assetManager, String path) {
    Bitmap bitmap = null;
    InputStream in = null;
    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inScaled = false;
    try {
      in = getAsset(assetManager, path);
      bitmap = BitmapFactory.decodeStream(in, null, options);
    } catch (IOException e) {
      throw new RuntimeException("Unable to load '" + path + "'", e);
    } finally {
      if (in != null) {
        try {
          in.close();
        } catch (IOException e) {
        }
      }
    }
    return bitmap;
  }

  /**
   * Returns the bounds of the specified Bitmap. This method does not load the Bitmap into memory.
   * 
   * @param context Context.
   * @param path File path. Relative to the assets folder.
   * @return Vector2 that contains the width and height of the specified Bitmap
   */
  public static Vector2 getBitmapBounds(Context context, String path) {
    InputStream in = null;
    int width;
    int height;
    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    try {
      in = getAsset(context, path);
      BitmapFactory.decodeStream(in, null, options);
      width = options.outWidth;
      height = options.outHeight;
    } catch (IOException e) {
      throw new RuntimeException("Unable to load '" + path + "'", e);
    } finally {
      if (in != null) {
        try {
          in.close();
        } catch (IOException e) {
        }
      }
    }
    return new Vector2(width, height);
  }

  /**
   * Returns an AssetFileDescriptor that can be used to read the specified asset.
   * 
   * @param context Context.
   * @param path File path. Relative to the assets folder.
   * @return AssetFileDescriptor
   */
  public static AssetFileDescriptor getAssetFileDescriptor(Context context, String path) {
    AssetFileDescriptor descriptor = null;
    try {
      descriptor = context.getAssets().openFd(path);
    } catch (IOException e) {
      e.printStackTrace();
    }
    return descriptor;
  }

}

Java Source Code List

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