Lecture 3: Maps and Navigation

Adding Maps

Adding maps is simple with Android studio.

Step 1

Step 2: Generate maps api key. 

Copy the link the starts like https://console.developers.google.com/flows/enableapi?apiid=maps_android_backend&keyType=CLIENT_SIDE_ANDROID

and paste in browser. 

you will get an api as shown in screen shot . Paste in xml file and run project . 

Google Fused Location API provider

Follow steps below to add Fused Location API.

Step 1: Add Location project to gradle and sync

compile 'com.google.android.gms:play-services-location:8.4.0'

compile 'com.google.android.gms:play-services-maps:8.4.0'

Step 2:Add Permissions to Manifest

  <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>

Step 3:Implement Interfaces

implements
        ConnectionCallbacks, OnConnectionFailedListener{

Step 4: Implement Methods 

@Overridepublic void onConnected(Bundle connectionHint) {
    

}

@Overridepublic void onConnectionSuspended(int i) {
}

@Overridepublic void onConnectionFailed(ConnectionResult connectionResult) {

}

Step 5: Connect with google api

if (mGoogleApiClient == null) {
    mGoogleApiClient = new GoogleApiClient.Builder(this)
            .addConnectionCallbacks(this)
            .addOnConnectionFailedListener(this)
            .addApi(LocationServices.API)
            .build();
}

protected void onStart() {
    mGoogleApiClient.connect();
    super.onStart();
}

protected void onStop() {
    mGoogleApiClient.disconnect();
    super.onStop();
}

Step 6: On Successful Connection start tracking location in on connected method of implemented interface

@Overridepublic void onConnected(Bundle connectionHint) {
    PublicMethods.writeTextToFile(context, "onConnected");
    
    mLastLocation = LocationServices.FusedLocationApi.getLastLocation(
            mGoogleApiClient);
    if (mLastLocation != null) {

        Toast.makeText(context, mLastLocation.getLongitude() + " , " + mLastLocation.getLatitude(), Toast.LENGTH_LONG).show();
        createLocationRequest();
    }

}

protected void createLocationRequest() {
    mLocationRequest = new LocationRequest();
    mLocationRequest.setInterval(10000);
    mLocationRequest.setFastestInterval(5000);
    mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
    startLocationUpdates();
}

protected void startLocationUpdates() {
    
    LocationServices.FusedLocationApi.requestLocationUpdates(
            mGoogleApiClient, mLocationRequest, new LocationListener() {
                @Override                public void onLocationChanged(Location location) {
                    Toast.makeText(context, location.getLongitude() + " , " + location.getLatitude(), Toast.LENGTH_LONG).show();
                    LatLng sydney = new LatLng(location.getLatitude(), location.getLongitude());
                    mMap.addMarker(new MarkerOptions().position(sydney).title("Marker is here"));
                    mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
                }
            });
}

Android Development - A Kick Start for beginners .

Tools Required for android 

• Java Development Kit(JDK)
• Android Studio
• Genymotion

Activity 

In Android, an activity is represent a single screen. Most applications have multiple activities to represent different screens, for example, one activity to display a list of the application settings, another activity to display the application status.

Create following two XML layout files in “res/layout/” folder :

1. res/layout/main.xml – Represent screen 1
2. res/layout/main2.xml – Represent screen 2

File : res/layout/main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/linearLayout1"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="I'm screen 1 (main.xml)"
        android:textAppearance="?android:attr/textAppearanceLarge" />

    <Button
        android:id="@+id/button1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Click me to another screen" />

</LinearLayout>

File : res/layout/main2.xml

Markup

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/linearLayout1"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="I'm screen 2 (main2.xml)"
        android:textAppearance="?android:attr/textAppearanceLarge" />

</LinearLayout>

2. Activities

Create two activity classes :

AppActivity.java –> main.xml
App2Activity.java –> main2.xml


To navigate from one screen to another screen, use following code :


Java

    Intent intent = new Intent(context, anotherActivity.class);
    startActivity(intent); 


File : AppActivity.java


Java

package com.mkyong.android;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.widget.Button;
import android.view.View;
import android.view.View.OnClickListener;

public class AppActivity extends Activity {

 Button button;

 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  addListenerOnButton();
 }

 public void addListenerOnButton() {

  final Context context = this;

  button = (Button) findViewById(R.id.button1);

  button.setOnClickListener(new OnClickListener() {

   @Override
   public void onClick(View arg0) {

       Intent intent = new Intent(context, App2Activity.class);
                            startActivity(intent);   

   }

  });

 }

}


File : App2Activity.java


Java

package com.mkyong.android;

import android.app.Activity;
import android.os.Bundle;
import android.widget.Button;

public class App2Activity extends Activity {

 Button button;

 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main2);
 }

}

3. AndroidManifest.xml

Declares above two activity classes in AndroidManifest.xml.

File : AndroidManifest.xml


Markup

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.mkyong.android"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="10" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:label="@string/app_name"
            android:name=".AppActivity" >
            <intent-filter >
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:label="@string/app_name"
            android:name=".App2Activity" >
        </activity>
    </application>

</manifest>


Now try running application and see what happens :)