Android Practices: Uber Like Setting Location by dragging a map in Android

activity_main.xml

marker_view.xml

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

    <ImageView
        android:id="@+id/marker_icon_view"
        android:layout_width="60dp"
        android:layout_height="60dp"
        android:layout_centerInParent="true"
        android:layout_marginTop="162dp"
        android:contentDescription="@string/app_name"
        android:src="@drawable/ic_launcher" />

</RelativeLayout>

location_display_view.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="60dp"
    android:background="@android:color/white" >

    <TextView
        android:id="@+id/text_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:gravity="center"
        android:text="Set Location"
        android:textColor="@android:color/holo_green_dark"
        android:textSize="12sp" />

    <TextView
        android:id="@+id/location_text_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/text_view"
        android:layout_centerHorizontal="true"
        android:gravity="center"
        android:text="Set Location"
        android:textColor="@android:color/black"
        android:textSize="14sp" />

</RelativeLayout>

MapWrapperLayout.java

package com.rajeshvijayakumar.map.demo.wrapper;

import android.content.Context;
import android.view.MotionEvent;
import android.widget.FrameLayout;

public class MapWrapperLayout extends FrameLayout {

    public interface OnDragListener {
        public void onDrag(MotionEvent motionEvent);
    }

    private OnDragListener mOnDragListener;

    public MapWrapperLayout(Context context) {
        super(context);
    }

    @Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
        if (mOnDragListener != null) {
            mOnDragListener.onDrag(ev);
        }
        return super.dispatchTouchEvent(ev);
    }

    public void setOnDragListener(OnDragListener mOnDragListener) {
        this.mOnDragListener = mOnDragListener;
    }
}

CustomMapFragment.java

package com.rajeshvijayakumar.map.demo.ui;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.google.android.gms.maps.MapFragment;
import com.rajeshvijayakumar.map.demo.wrapper.MapWrapperLayout;

public class CustomMapFragment extends MapFragment {

    private View mOriginalView;
    private MapWrapperLayout mMapWrapperLayout;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        mOriginalView = super.onCreateView(inflater, container, savedInstanceState);

        mMapWrapperLayout = new MapWrapperLayout(getActivity());
        mMapWrapperLayout.addView(mOriginalView);

        return mMapWrapperLayout;
}

    @Override
    public View getView() {
        return mOriginalView;
    }

    public void setOnDragListener(MapWrapperLayout.OnDragListener onDragListener) {
        mMapWrapperLayout.setOnDragListener(onDragListener);
    }
}

MainActivity.java

package com.rajeshvijayakumar.map.demo;

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

import android.app.Activity;
import android.graphics.Point;
import android.location.Address;
import android.location.Geocoder;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.view.MotionEvent;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import com.rajeshvijayakumar.map.demo.R;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.Projection;
import com.google.android.gms.maps.model.LatLng;
import com.rajeshvijayakumar.map.demo.ui.CustomMapFragment;
import com.rajeshvijayakumar.map.demo.wrapper.MapWrapperLayout.OnDragListener;

public class MainActivity extends Activity implements OnDragListener {

    // Google Map
    private GoogleMap googleMap;
    private CustomMapFragment mCustomMapFragment;

    private View mMarkerParentView;
    private ImageView mMarkerImageView;

    private int imageParentWidth = -1;
    private int imageParentHeight = -1;
    private int imageHeight = -1;
    private int centerX = -1;
    private int centerY = -1;

    private TextView mLocationTextView;

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

        // InitializeUI
        initializeUI();

    }

    private void initializeUI() {

        try {
            // Loading map
            initilizeMap();

        } catch (Exception e) {
            e.printStackTrace();
        }
        mLocationTextView = (TextView) findViewById(R.id.location_text_view);
        mMarkerParentView = findViewById(R.id.marker_view_incl);
        mMarkerImageView = (ImageView) findViewById(R.id.marker_icon_view);
    }

    @Override
    public void onWindowFocusChanged(boolean hasFocus) {
        DisplayMetrics displaymetrics = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);

        imageParentWidth = mMarkerParentView.getWidth();
        imageParentHeight = mMarkerParentView.getHeight();
        imageHeight = mMarkerImageView.getHeight();

        centerX = imageParentWidth / 2;
        centerY = (imageParentHeight / 2) + (imageHeight / 2);
    }

    private void initilizeMap() {
        if (googleMap == null) {
            mCustomMapFragment = ((CustomMapFragment) getFragmentManager()
                    .findFragmentById(R.id.map));
            mCustomMapFragment.setOnDragListener(MainActivity.this);
            googleMap = mCustomMapFragment.getMap();
            // check if map is created successfully or not
            if (googleMap == null) {
                Toast.makeText(getApplicationContext(),
                        "Sorry! unable to create maps", Toast.LENGTH_SHORT)
                        .show();
            }
        }
        // CameraUpdate cameraUpdate = CameraUpdateFactory.newLatLngZoom(latLng,
        // 10);
        // googleMap.animateCamera(cameraUpdate);
        // locationManager.removeUpdates(this);
    }

    @Override
    protected void onResume() {
        super.onResume();
    }

    @Override
    public void onDrag(MotionEvent motionEvent) {
        if (motionEvent.getAction() == MotionEvent.ACTION_UP) {
            Projection projection = (googleMap != null && googleMap
                    .getProjection() != null) ? googleMap.getProjection()
                    : null;
            //
            if (projection != null) {
                LatLng centerLatLng = projection.fromScreenLocation(new Point(
                        centerX, centerY));
                updateLocation(centerLatLng);
            }
        }
    }

    private void updateLocation(LatLng centerLatLng) {
        if (centerLatLng != null) {
            Geocoder geocoder = new Geocoder(MainActivity.this,
                    Locale.getDefault());

            List<Address> addresses = new ArrayList<Address>();
            try {
                addresses = geocoder.getFromLocation(centerLatLng.latitude,
                        centerLatLng.longitude, 1);
            } catch (IOException e) {
                e.printStackTrace();
            }

            if (addresses != null && addresses.size() > 0) {

                String addressIndex0 = (addresses.get(0).getAddressLine(0) != null) ? addresses
                        .get(0).getAddressLine(0) : null;
                String addressIndex1 = (addresses.get(0).getAddressLine(1) != null) ? addresses
                        .get(0).getAddressLine(1) : null;
                String addressIndex2 = (addresses.get(0).getAddressLine(2) != null) ? addresses
                        .get(0).getAddressLine(2) : null;
                String addressIndex3 = (addresses.get(0).getAddressLine(3) != null) ? addresses
                        .get(0).getAddressLine(3) : null;

                String completeAddress = addressIndex0 + "," + addressIndex1;

                if (addressIndex2 != null) {
                    completeAddress += "," + addressIndex2;
                }
                if (addressIndex3 != null) {
                    completeAddress += "," + addressIndex3;
                }
                if (completeAddress != null) {
                    mLocationTextView.setText(completeAddress);
                }
            }
        }
    }
}

Expected Output :

Android Practices

Sunday, 2 August 2015

Uber Like Setting Location by dragging a map in Android