Wednesday, March 12, 2014

WebView to load Google Maps JavaScript API v3 with Panoramio Layer

This example load WebView with built-in HTML inside APK, using Google Maps JavaScript API v3 with Panoramio Layer.

WebView to load Google Maps JavaScript API v3 with Panoramio Layer

The code created using project wizard of new Android SDK Tools 22.6, MainActivity extends android.support.v7.app.ActionBarActivity with Fragment.

Create /assets/panoramiomap.html, copy the JavaScript + HTML example from Google Maps JavaScript API v3 example with Panoramio Layer.
<!DOCTYPE html>
<html>
  <head>
    <title>Panoramio Layer</title>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <style>
      html, body, #map-canvas {
        height: 100%;
        margin: 0px;
        padding: 0px
      }
      #panel {
        position: absolute;
        top: 5px;
        left: 50%;
        margin-left: -180px;
        z-index: 5;
        background-color: #fff;
        padding: 5px;
        border: 1px solid #999;
      }
#photo-panel {
  background: #fff;
  padding: 5px;
  overflow-y: auto;
  overflow-x: hidden;
  width: 300px;
  max-height: 300px;
  font-size: 14px;
  font-family: Arial;
  border: 1px solid #ccc;
  box-shadow: -2px 2px 2px rgba(33, 33, 33, 0.4);
  display: none;
}
    </style>
    <script src="https://maps.googleapis.com/maps/api/js?v=3.exp&sensor=false&libraries=panoramio"></script>
    <script>
function initialize() {
  var mapOptions = {
    zoom: 16,
    center: new google.maps.LatLng(47.651743, -122.349243)
  };

  var map = new google.maps.Map(document.getElementById('map-canvas'),
      mapOptions);

  var panoramioLayer = new google.maps.panoramio.PanoramioLayer();
  panoramioLayer.setMap(map);

  var photoPanel = document.getElementById('photo-panel');
  map.controls[google.maps.ControlPosition.RIGHT_TOP].push(photoPanel);

  google.maps.event.addListener(panoramioLayer, 'click', function(photo) {
    var li = document.createElement('li');
    var link = document.createElement('a');
    link.innerHTML = photo.featureDetails.title + ': ' +
        photo.featureDetails.author;
    link.setAttribute('href', photo.featureDetails.url);
    li.appendChild(link);
    photoPanel.appendChild(li);
    photoPanel.style.display = 'block';
  });
}

google.maps.event.addDomListener(window, 'load', initialize);

    </script>
  </head>
  <body>
    <ul id="photo-panel">
      <li><strong>Photos clicked</strong></li>
    </ul>
    <div id="map-canvas"></div>
  </body>
</html>

/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" >

    <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" />

    <FrameLayout
        android:id="@+id/container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context="com.example.androidwebviewpanoramio.MainActivity"
        tools:ignore="MergeRootFrame"
        android:background="#505050" />

</LinearLayout>

Modify /res/layout/fragment_main.xml to add a <WebView>
<RelativeLayout 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: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.androidwebviewpanoramio.MainActivity$PlaceholderFragment" >

    <WebView
        android:id="@+id/mybrowser"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</RelativeLayout>

MainActivity.java
package com.example.androidwebviewpanoramio;

import android.support.v7.app.ActionBarActivity;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebView;

public class MainActivity extends ActionBarActivity {

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);

  if (savedInstanceState == null) {
   getSupportFragmentManager().beginTransaction()
     .add(R.id.container, new PlaceholderFragment()).commit();
  }

 }

 @Override
 public boolean onCreateOptionsMenu(Menu menu) {

  // Inflate the menu; this adds items to the action bar if it is present.
  getMenuInflater().inflate(R.menu.main, menu);
  return true;
 }

 @Override
 public boolean onOptionsItemSelected(MenuItem item) {
  // Handle action bar item clicks here. The action bar will
  // automatically handle clicks on the Home/Up button, so long
  // as you specify a parent activity in AndroidManifest.xml.
  int id = item.getItemId();
  if (id == R.id.action_settings) {
   return true;
  }
  return super.onOptionsItemSelected(item);
 }

 /**
  * A placeholder fragment containing a simple view.
  */
 public static class PlaceholderFragment extends Fragment {
  
  WebView myBrowser;

  public PlaceholderFragment() {
  }

  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container,
    Bundle savedInstanceState) {
   View rootView = inflater.inflate(R.layout.fragment_main, container,
     false);
   
   myBrowser = (WebView) rootView.findViewById(R.id.mybrowser);   
   myBrowser.loadUrl("file:///android_asset/panoramiomap.html");
   myBrowser.getSettings().setJavaScriptEnabled(true);
   
   return rootView;
  }
 }

}

<uses-permission android:name="android.permission.INTERNET"/> is needed in AndroidManifest.xml.

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