Question

Write an app that asks the user to enter an address in several TextViews. When the user clicks on a button, the app displays a map centered on that address. Android Programming

Answer 1

Solution:

Manifest.xml

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

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

<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">

<meta-data
android:name="com.google.android.geo.API_KEY"
android:value="AIzaSyBuljOjByqE0GRMh19DT2vffTYhKU0wEuo or (Your API Key here)"/>

<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />

<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>

<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
<activity android:name=".MapActivity"/>
</application>

</manifest>

--------------------------------------------------------------------------------------------------

Layout file:

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.googlemapsgoogleplaces.abc.MainActivity">

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Map"
android:id="@+id/btnMap"/>

</android.support.constraint.ConstraintLayout>

---------------------------------

activity_map.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">

<fragment 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:id="@+id/map"
tools:context=".MapsActivity"
android:name="com.google.android.gms.maps.SupportMapFragment" />

<RelativeLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_marginTop="10dp"
android:layout_marginRight="10dp"
android:layout_marginLeft="10dp"
android:elevation="10dp"
android:background="@drawable/white_border"
android:id="@+id/relLayout1">

<ImageView
android:layout_width="15dp"
android:layout_height="15dp"
android:id="@+id/ic_magnify"
android:layout_centerVertical="true"
android:layout_marginLeft="10dp"
android:src="@drawable/ic_magnify"/>

<EditText
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_toRightOf="@+id/ic_magnify"
android:layout_centerVertical="true"
android:textSize="15sp"
android:textColor="#000"
android:id="@+id/input_search"
android:background="@null"
android:hint="Enter Address, City or Zip Code"
android:imeOptions="actionSearch"/>

</RelativeLayout>

<ImageView
android:layout_width="40dp"
android:layout_height="40dp"
android:layout_below="@id/relLayout1"
android:layout_alignParentRight="true"
android:layout_marginRight="10dp"
android:layout_marginTop="10dp"
android:scaleType="centerCrop"
android:id="@+id/ic_gps"
android:src="@drawable/ic_gps"/>
</RelativeLayout>

-------------------------------------------------------------------------------------------------

Java File:

MainActivity.java

package com.googlemapsgoogleplaces.abc;

import android.app.Dialog;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GoogleApiAvailability;

public class MainActivity extends AppCompatActivity {

private static final String TAG = "MainActivity";

private static final int ERROR_DIALOG_REQUEST = 9001;

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

if(isServicesOK()){
init();
}
}

private void init(){
Button btnMap = (Button) findViewById(R.id.btnMap);
btnMap.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(MainActivity.this, MapActivity.class);
startActivity(intent);
}
});
}

public boolean isServicesOK(){
Log.d(TAG, "isServicesOK: checking google services version");

int available = GoogleApiAvailability.getInstance().isGooglePlayServicesAvailable(MainActivity.this);

if(available == ConnectionResult.SUCCESS){
//everything is fine and the user can make map requests
Log.d(TAG, "isServicesOK: Google Play Services is working");
return true;
}
else if(GoogleApiAvailability.getInstance().isUserResolvableError(available)){
//an error occured but we can resolve it
Log.d(TAG, "isServicesOK: an error occured but we can fix it");
Dialog dialog = GoogleApiAvailability.getInstance().getErrorDialog(MainActivity.this, available, ERROR_DIALOG_REQUEST);
dialog.show();
}else{
Toast.makeText(this, "You can't make map requests", Toast.LENGTH_SHORT).show();
}
return false;
}

}

----------------------------------------------------------

MapActivity.java

package com.googlemapsgoogleplaces.abc;

import android.*;
import android.Manifest;
import android.content.pm.PackageManager;
import android.location.Address;
import android.location.Geocoder;
import android.location.Location;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.view.WindowManager;
import android.view.inputmethod.EditorInfo;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import com.google.android.gms.location.FusedLocationProviderClient;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

/**
* Created by User on 10/2/2017.
*/

public class MapActivity extends AppCompatActivity implements OnMapReadyCallback {

@Override
public void onMapReady(GoogleMap googleMap) {
Toast.makeText(this, "Map is Ready", Toast.LENGTH_SHORT).show();
Log.d(TAG, "onMapReady: map is ready");
mMap = googleMap;

if (mLocationPermissionsGranted) {
getDeviceLocation();

if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return;
}
mMap.setMyLocationEnabled(true);
mMap.getUiSettings().setMyLocationButtonEnabled(false);

init();
}
}

private static final String TAG = "MapActivity";

private static final String FINE_LOCATION = Manifest.permission.ACCESS_FINE_LOCATION;
private static final String COURSE_LOCATION = Manifest.permission.ACCESS_COARSE_LOCATION;
private static final int LOCATION_PERMISSION_REQUEST_CODE = 1234;
private static final float DEFAULT_ZOOM = 15f;

//widgets
private EditText mSearchText;
private ImageView mGps;

//vars
private Boolean mLocationPermissionsGranted = false;
private GoogleMap mMap;
private FusedLocationProviderClient mFusedLocationProviderClient;

@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_map);
mSearchText = (EditText) findViewById(R.id.input_search);
mGps = (ImageView) findViewById(R.id.ic_gps);

getLocationPermission();

}

private void init(){
Log.d(TAG, "init: initializing");

mSearchText.setOnEditorActionListener(new TextView.OnEditorActionListener() {
@Override
public boolean onEditorAction(TextView textView, int actionId, KeyEvent keyEvent) {
if(actionId == EditorInfo.IME_ACTION_SEARCH
|| actionId == EditorInfo.IME_ACTION_DONE
|| keyEvent.getAction() == KeyEvent.ACTION_DOWN
|| keyEvent.getAction() == KeyEvent.KEYCODE_ENTER){

//execute our method for searching
geoLocate();
}

return false;
}
});

mGps.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Log.d(TAG, "onClick: clicked gps icon");
getDeviceLocation();
}
});

hideSoftKeyboard();
}

private void geoLocate(){
Log.d(TAG, "geoLocate: geolocating");

String searchString = mSearchText.getText().toString();

Geocoder geocoder = new Geocoder(MapActivity.this);
List<Address> list = new ArrayList<>();
try{
list = geocoder.getFromLocationName(searchString, 1);
}catch (IOException e){
Log.e(TAG, "geoLocate: IOException: " + e.getMessage() );
}

if(list.size() > 0){
Address address = list.get(0);

Log.d(TAG, "geoLocate: found a location: " + address.toString());
//Toast.makeText(this, address.toString(), Toast.LENGTH_SHORT).show();

moveCamera(new LatLng(address.getLatitude(), address.getLongitude()), DEFAULT_ZOOM,
address.getAddressLine(0));
}
}

private void getDeviceLocation(){
Log.d(TAG, "getDeviceLocation: getting the devices current location");

mFusedLocationProviderClient = LocationServices.getFusedLocationProviderClient(this);

try{
if(mLocationPermissionsGranted){

final Task location = mFusedLocationProviderClient.getLastLocation();
location.addOnCompleteListener(new OnCompleteListener() {
@Override
public void onComplete(@NonNull Task task) {
if(task.isSuccessful()){
Log.d(TAG, "onComplete: found location!");
Location currentLocation = (Location) task.getResult();

moveCamera(new LatLng(currentLocation.getLatitude(), currentLocation.getLongitude()),
DEFAULT_ZOOM,
"My Location");

}else{
Log.d(TAG, "onComplete: current location is null");
Toast.makeText(MapActivity.this, "unable to get current location", Toast.LENGTH_SHORT).show();
}
}
});
}
}catch (SecurityException e){
Log.e(TAG, "getDeviceLocation: SecurityException: " + e.getMessage() );
}
}

private void moveCamera(LatLng latLng, float zoom, String title){
Log.d(TAG, "moveCamera: moving the camera to: lat: " + latLng.latitude + ", lng: " + latLng.longitude );
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng, zoom));

if(!title.equals("My Location")){
MarkerOptions options = new MarkerOptions()
.position(latLng)
.title(title);
mMap.addMarker(options);
}

hideSoftKeyboard();
}

private void initMap(){
Log.d(TAG, "initMap: initializing map");
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);

mapFragment.getMapAsync(MapActivity.this);
}

private void getLocationPermission(){
Log.d(TAG, "getLocationPermission: getting location permissions");
String[] permissions = {Manifest.permission.ACCESS_FINE_LOCATION,
Manifest.permission.ACCESS_COARSE_LOCATION};

if(ContextCompat.checkSelfPermission(this.getApplicationContext(),
FINE_LOCATION) == PackageManager.PERMISSION_GRANTED){
if(ContextCompat.checkSelfPermission(this.getApplicationContext(),
COURSE_LOCATION) == PackageManager.PERMISSION_GRANTED){
mLocationPermissionsGranted = true;
initMap();
}else{
ActivityCompat.requestPermissions(this,
permissions,
LOCATION_PERMISSION_REQUEST_CODE);
}
}else{
ActivityCompat.requestPermissions(this,
permissions,
LOCATION_PERMISSION_REQUEST_CODE);
}
}

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
Log.d(TAG, "onRequestPermissionsResult: called.");
mLocationPermissionsGranted = false;

switch(requestCode){
case LOCATION_PERMISSION_REQUEST_CODE:{
if(grantResults.length > 0){
for(int i = 0; i < grantResults.length; i++){
if(grantResults[i] != PackageManager.PERMISSION_GRANTED){
mLocationPermissionsGranted = false;
Log.d(TAG, "onRequestPermissionsResult: permission failed");
return;
}
}
Log.d(TAG, "onRequestPermissionsResult: permission granted");
mLocationPermissionsGranted = true;
//initialize our map
initMap();
}
}
}
}

private void hideSoftKeyboard(){
this.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
}

}
----------------------------------------------------------------------------------------

Screnshots and Output:

@ activity map. ml × @ white border. ml x ⓒ Ma Activity ava × c MainActivity java × strings. 1 × activity main.xml MapActivity geooct catch (SecurityException e) 175 176 Log.e(TAG, "getDeviceLocation: SecurityException:e.getMessage()); 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 private void moveCamera (LatLng latLng, float zoom, String title) 9 Log . d( TAG, "moveCamera : moving the camera to: lat: " + lat Lng.latitude + ", Ing: " + 1at Lng·longitude ); mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng, zoom)); if Ititle.equals("My Location")) MarkerOptions options new MarkerOptions () .position (latLng) title (title); mMap.addMarker(options); hideSoftKeyboard) private void initMap) Log.d(TAG, "initMap: initializing map"); SupportMapFragment mapFragment(SupportMapFragment) getSupportFragmentManager).findFragmentById(R.id.map); 195 196 197 198 mapFragment.getMapAsync (MapActivity.this); 199 200 201 202 283 284 private void getLocationPermission) Log.d(TAG, "getLocationPermission: getting location permissions"); String[] permissions (Manifest.permission.ACCESS FINE LOCATION, Manifest.permission.ACCESS_COARSE LOCATION);

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