| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * |
| * 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.example.android.mediabrowserservice.utils; |
| |
| import android.graphics.Bitmap; |
| import android.graphics.BitmapFactory; |
| |
| import java.io.BufferedInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.net.HttpURLConnection; |
| import java.net.URL; |
| |
| public class BitmapHelper { |
| private static final String TAG = LogHelper.makeLogTag(BitmapHelper.class); |
| |
| // Max read limit that we allow our input stream to mark/reset. |
| private static final int MAX_READ_LIMIT_PER_IMG = 1024 * 1024; |
| |
| public static Bitmap scaleBitmap(Bitmap src, int maxWidth, int maxHeight) { |
| double scaleFactor = Math.min( |
| ((double) maxWidth)/src.getWidth(), ((double) maxHeight)/src.getHeight()); |
| return Bitmap.createScaledBitmap(src, |
| (int) (src.getWidth() * scaleFactor), (int) (src.getHeight() * scaleFactor), false); |
| } |
| |
| public static Bitmap scaleBitmap(int scaleFactor, InputStream is) { |
| // Get the dimensions of the bitmap |
| BitmapFactory.Options bmOptions = new BitmapFactory.Options(); |
| |
| // Decode the image file into a Bitmap sized to fill the View |
| bmOptions.inJustDecodeBounds = false; |
| bmOptions.inSampleSize = scaleFactor; |
| |
| return BitmapFactory.decodeStream(is, null, bmOptions); |
| } |
| |
| public static int findScaleFactor(int targetW, int targetH, InputStream is) { |
| // Get the dimensions of the bitmap |
| BitmapFactory.Options bmOptions = new BitmapFactory.Options(); |
| bmOptions.inJustDecodeBounds = true; |
| BitmapFactory.decodeStream(is, null, bmOptions); |
| int actualW = bmOptions.outWidth; |
| int actualH = bmOptions.outHeight; |
| |
| // Determine how much to scale down the image |
| return Math.min(actualW/targetW, actualH/targetH); |
| } |
| |
| @SuppressWarnings("SameParameterValue") |
| public static Bitmap fetchAndRescaleBitmap(String uri, int width, int height) |
| throws IOException { |
| URL url = new URL(uri); |
| BufferedInputStream is = null; |
| try { |
| HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection(); |
| is = new BufferedInputStream(urlConnection.getInputStream()); |
| is.mark(MAX_READ_LIMIT_PER_IMG); |
| int scaleFactor = findScaleFactor(width, height, is); |
| LogHelper.d(TAG, "Scaling bitmap ", uri, " by factor ", scaleFactor, " to support ", |
| width, "x", height, "requested dimension"); |
| is.reset(); |
| return scaleBitmap(scaleFactor, is); |
| } finally { |
| if (is != null) { |
| is.close(); |
| } |
| } |
| } |
| } |