Android Open Source - SmartNavi Bonus Pack Helper

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License

The source code is released under:

Apache License

Java Source Code

package org.osmdroid.bonuspack.utils;
/*from w ww .  j  a va  2s. com*/
import java.io.BufferedReader;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.util.List;
import org.apache.http.NameValuePair;
import org.osmdroid.util.BoundingBoxE6;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Build;

/** Useful functions and common constants. 
 * @author M.Kergall
 */
public class BonusPackHelper {

  /** Log tag. */
  public static final String LOG_TAG = "BONUSPACK";
  
  /** resource id value meaning "undefined resource id" */
  public static final int UNDEFINED_RES_ID = 0;
  
  /**  User agent sent to services by default */
  public static final String DEFAULT_USER_AGENT = "OsmBonusPack/1";
  
  /** @return true if the device is the emulator, false if actual device. 
   */
  public static boolean isEmulator(){
    //return Build.MANUFACTURER.equals("unknown");
    return ("google_sdk".equals(Build.PRODUCT) || "sdk".equals(Build.PRODUCT));
  }
  
  public static BoundingBoxE6 cloneBoundingBoxE6(BoundingBoxE6 bb){
    return new BoundingBoxE6(
        bb.getLatNorthE6(), 
        bb.getLonEastE6(), 
        bb.getLatSouthE6(), 
        bb.getLonWestE6());
  }
  
  /** @return the BoundingBox enclosing bb1 and bb2 BoundingBoxes */
  public static BoundingBoxE6 concatBoundingBoxE6(BoundingBoxE6 bb1, BoundingBoxE6 bb2){
    return new BoundingBoxE6(
        Math.max(bb1.getLatNorthE6(), bb2.getLatNorthE6()), 
        Math.max(bb1.getLonEastE6(), bb2.getLonEastE6()),
        Math.min(bb1.getLatSouthE6(), bb2.getLatSouthE6()),
        Math.min(bb1.getLonWestE6(), bb2.getLonWestE6()));
  }
  
  /** 
   * @return the whole content of the http request, as a string
   */
  private static String readStream(HttpConnection connection){
    String result = connection.getContentAsString();
    return result;
  }

  /** sends an http request, and returns the whole content result in a String. 
   * @param url
   * @return the whole content, or null if any issue. 
   */
  public static String requestStringFromUrl(String url) {
    HttpConnection connection = new HttpConnection();
    connection.doGet(url);
    String result = readStream(connection);
    connection.close();
    return result;
  }

  /** requestStringFromPost: do a post request to a url with name-value pairs, 
   * and returns the whole content result in a String. 
   * @param url
   * @param nameValuePairs
   * @return the content, or null if any issue. 
   */
  public static String requestStringFromPost(String url, List<NameValuePair> nameValuePairs) {
    HttpConnection connection = new HttpConnection();
    connection.doPost(url, nameValuePairs);
    String result = readStream(connection);
    connection.close();
    return result;
  }

  public static String convertStreamToString(InputStream is) throws Exception {
    BufferedReader reader = new BufferedReader(new InputStreamReader(is));
    StringBuilder sb = new StringBuilder();
    String line = null;
    while ((line = reader.readLine()) != null) {
      sb.append(line).append("\n");
    }
    reader.close();
    return sb.toString();
  }
  
  /**
   * Loads a bitmap from a url. 
   * @param url
   * @return the bitmap, or null if any issue. 
   */
  public static Bitmap loadBitmap(String url) {
    Bitmap bitmap = null;
    try {
      InputStream is = (InputStream) new URL(url).getContent();
      if (is == null)
        return null;
      bitmap = BitmapFactory.decodeStream(new FlushedInputStream(is));
      //Alternative providing better handling on loading errors?
      /*
      Drawable d = Drawable.createFromStream(new FlushedInputStream(is), null);
      if (is != null)
        is.close();
      if (d != null)
        bitmap = ((BitmapDrawable)d).getBitmap();
      */
    } catch (Exception e) {
      e.printStackTrace();
      return null;
    }
    return bitmap;
  }

  /**
   * Workaround on Android issue
   * see http://stackoverflow.com/questions/4601352/createfromstream-in-android-returning-null-for-certain-url
   */
  static class FlushedInputStream extends FilterInputStream {
      public FlushedInputStream(InputStream inputStream) {
        super(inputStream);
      }

      @Override public long skip(long n) throws IOException {
          long totalBytesSkipped = 0L;
          while (totalBytesSkipped < n) {
              long bytesSkipped = in.skip(n - totalBytesSkipped);
              if (bytesSkipped == 0L) {
                    int byteValue = read();
                    if (byteValue < 0) {
                        break;  // we reached EOF
                    } else {
                        bytesSkipped = 1; // we read one byte
                    }
             }
             totalBytesSkipped += bytesSkipped;
          }
          return totalBytesSkipped;
      }
  }
}

Java Source Code List

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