Here Map Tile REST API example, Base Map, Aerial and Traffic Tile

In this example, we show how to display Here map of Base Map, Aerial and Traffic Tile.


MainActivity.java

package com.example.androidhererestmapimage;

import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;

import android.support.v7.app.ActionBarActivity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.Spinner;
import android.widget.TextView;

public class MainActivity extends ActionBarActivity {

 public class LoadHereMapTask extends AsyncTask<URL, Void, Bitmap> {
  
  ImageView imageView;
  
  LoadHereMapTask(ImageView v){
   imageView = v;
  }

  @Override
  protected Bitmap doInBackground(URL... params) {
   Bitmap bm = null;
   URL urlMapImage = params[0];
   try {
    bm = BitmapFactory.decodeStream(urlMapImage.openConnection().getInputStream());
   } catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
   return bm;
  }

  @Override
  protected void onPostExecute(Bitmap result) {
   imageView.setImageBitmap(result);
  }

 }
 
 private final int optTypeBaseMap = 0;
 private final int optTypeAerialTile = 1;
 private final int optTypeTrafficTile = 2;
 String[] optTypes = {
      "Base Map", 
      "Aerial Tile", 
      "Traffic Tile"};
 
 SeekBar sbZoom;
 Spinner spType;
 TextView textviewMapRqs512, textviewMapRqs256;
 ImageView mapImage1, mapImage2;
 
 ArrayAdapter<String> spTypeAdapter;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  
  textviewMapRqs512 = (TextView)findViewById(R.id.maprqs512);
  textviewMapRqs256 = (TextView)findViewById(R.id.maprqs256);
  mapImage1 = (ImageView)findViewById(R.id.mapimage1);
  mapImage2 = (ImageView)findViewById(R.id.mapimage2);
  sbZoom = (SeekBar)findViewById(R.id.sbzoom);
  sbZoom.setOnSeekBarChangeListener(new OnSeekBarChangeListener(){

   @Override
   public void onProgressChanged(SeekBar seekBar, int progress,
     boolean fromUser) {
    // TODO Auto-generated method stub
    
   }

   @Override
   public void onStartTrackingTouch(SeekBar seekBar) {
    // TODO Auto-generated method stub
    
   }

   @Override
   public void onStopTrackingTouch(SeekBar seekBar) {
    updateHereMap();
   }});
  
  spType = (Spinner)findViewById(R.id.sptype);
  spTypeAdapter = new ArrayAdapter<String>(
   this,android.R.layout.simple_spinner_item, optTypes);
  spTypeAdapter.setDropDownViewResource(
    android.R.layout.simple_spinner_dropdown_item);
  spType.setAdapter(spTypeAdapter);
  
  spType.setOnItemSelectedListener(new OnItemSelectedListener(){

   @Override
   public void onItemSelected(AdapterView<?> parent, View view,
     int position, long id) {
    updateHereMap();
   }

   @Override
   public void onNothingSelected(AdapterView<?> parent) {
    // TODO Auto-generated method stub
    
   }});
  
  updateHereMap();

 }
 
 private void updateHereMap(){
  URL urlTarget;
  
  try {
   String strTarget512 = genHereMapTileRequest("/512");
   textviewMapRqs512.setText(strTarget512);
   urlTarget = new URL(strTarget512);
   new LoadHereMapTask(mapImage1).execute(urlTarget);
   
   String strTarget256 = genHereMapTileRequest("/256");
   textviewMapRqs256.setText(strTarget256);
   urlTarget = new URL(strTarget256);
   new LoadHereMapTask(mapImage2).execute(urlTarget);
  } catch (MalformedURLException e) {
   e.printStackTrace();
  }
 }
 
 private String getMercatorProjection(double lat, double lon, int z){
  /*
   * reference:
   * http://developer.here.com/rest-apis/documentation/enterprise-map-tile/topics/key-concepts.html
   */
  
  double latRad = lat * Math.PI/180;
  double n = Math.pow(2, z);
  double xTile = n * ((lon + 180)/360);
  double yTile = n * (1-(Math.log(Math.tan(latRad) + 1/Math.cos(latRad))/Math.PI))/2;
  
  String strProjection = "/"+ String.valueOf(z)
   + "/" + String.valueOf((int)xTile)
   + "/" + String.valueOf((int)yTile);
  
  return strProjection;
 }
 
 private String genHereMapTileRequest(String pixelCnt){
  /*
   * reference:
   * https://developer.here.com/rest-apis/documentation/enterprise-map-tile/topics/resource-map-tile.html
   */
  
  String BaseURL;
  String Path = "/maptile/2.1/";
  String Resource;
  String Version = "/newest";
  String scheme;
  
  int type = spType.getSelectedItemPosition();
  switch(type){
  case optTypeBaseMap:
   BaseURL = "http://1.base.maps.cit.api.here.com";
   Resource = "maptile";
   scheme = "/normal.day";
   break;
  case optTypeAerialTile:
   BaseURL = "http://2.aerial.maps.cit.api.here.com";
   Resource = "maptile";
   scheme = "/satellite.day";
   break;
  case optTypeTrafficTile:
   BaseURL = "http://4.traffic.maps.cit.api.here.com";
   Resource = "traffictile";
   scheme = "/normal.day";
   break;
  default:
   return null;
  }

  String ApplicationId = "DemoAppId01082013GAL";  //for demo
  String ApplicationCode = "AJKnXv84fjrb0KIHawS0Tg"; //for demo
  String png8 = "/png8";
  
  int zoom = sbZoom.getProgress();
  //Berlin
  String strZoomColumnRow = getMercatorProjection(52.525439, 13.38727, zoom);

  String rqs = BaseURL + Path + Resource + Version + scheme + strZoomColumnRow
    + pixelCnt
    + png8
    + "?app_id=" + ApplicationId
    + "&app_code=" + ApplicationCode;

  return rqs;
 }

}

/res/layout/activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.androidhererestmapimage.MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:autoLink="web"
        android:text="http://android-er.blogspot.com/"
        android:textStyle="bold" />

    <SeekBar
        android:id="@+id/sbzoom"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:max="13"
        android:progress="5" />
    
    <Spinner
        android:id="@+id/sptype"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="horizontal" >

        <LinearLayout
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:layout_margin="5dp"
            android:orientation="vertical" >

            <TextView
                android:id="@+id/maprqs512"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" />

            <ImageView
                android:id="@+id/mapimage1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:layout_margin="5dp"
            android:orientation="vertical" >

            <TextView
                android:id="@+id/maprqs256"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" />

            <ImageView
                android:id="@+id/mapimage2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" />
        </LinearLayout>
    </LinearLayout>

</LinearLayout>

uses-permission of "android.permission.INTERNET" is needed in AndroidManifest.xml.

Download the files.

~ More examples of using Here Map REST API on Android