solarcompass/src/main/java/com/agnibho/android/solarcompass/MainActivity.java

   1 /**********************************************************************
   2  * Title: Solar Compass
   3  * Description: Android app for finding directions using the sun
   4  * Author: Agnibho Mondal
   5  * Website: http://code.agnibho.com/solarcompass
   6  **********************************************************************
   7  Copyright (c) 2016 Agnibho Mondal
   8  All rights reserved
   9  **********************************************************************
  10  This file is part of Solar Compass.
  11
  12  Solar Compass is free software: you can redistribute it and/or modify
  13  it under the terms of the GNU General Public License as published by
  14  the Free Software Foundation, either version 3 of the License, or
  15  (at your option) any later version.
  16
  17  Solar Compass is distributed in the hope that it will be useful,
  18  but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  GNU General Public License for more details.
  21
  22  You should have received a copy of the GNU General Public License
  23  along with Solar Compass.  If not, see <http://www.gnu.org/licenses/>.
  24  **********************************************************************/
  25
  26 package com.agnibho.android.solarcompass;
  27
  28 import android.app.Activity;
  29 import android.app.AlertDialog;
  30 import android.content.ClipData;
  31 import android.content.Context;
  32 import android.content.DialogInterface;
  33 import android.content.Intent;
  34 import android.location.Location;
  35 import android.location.LocationManager;
  36 import android.os.Build;
  37 import android.os.Bundle;
  38 import android.view.DragEvent;
  39 import android.view.MotionEvent;
  40 import android.view.View;
  41 import android.view.ViewTreeObserver;
  42 import android.view.animation.LinearInterpolator;
  43 import android.view.animation.RotateAnimation;
  44 import android.widget.ImageButton;
  45 import android.widget.ImageView;
  46 import android.widget.TextView;
  47 import android.widget.Toast;
  48
  49 import java.util.Calendar;
  50
  51 public class MainActivity extends Activity {
  52
  53     private LocationData locationData=LocationData.getInstance();
  54     private float[] center=new float[2];
  55     private float currCompass=0;
  56
  57     private TextView displayLoc;
  58     private ImageButton locBtn;
  59     private ImageButton helpBtn;
  60     private ImageView dial;
  61     private ImageView compass;
  62
  63     @Override
  64     protected void onCreate(Bundle savedInstanceState) {
  65         super.onCreate(savedInstanceState);
  66         setContentView(R.layout.activity_main);
  67
  68         if(Calendar.getInstance().get(Calendar.HOUR_OF_DAY)<6 || Calendar.getInstance().get(Calendar.HOUR_OF_DAY)>18){
  69             nightAlert();
  70         }
  71
  72         displayLoc=(TextView)findViewById(R.id.textView4);
  73
  74         gpsLocation();
  75         if(locationData.isAvailable()) {
  76             displayLocation();
  77         }
  78         else{
  79             startActivity(new Intent(MainActivity.this, LocationActivity.class));
  80         }
  81
  82         /**
  83          * LocationData Button
  84          */
  85         locBtn = (ImageButton)findViewById(R.id.imageButton);
  86         locBtn.setOnClickListener(new View.OnClickListener() {
  87             @Override
  88             public void onClick(View v) {
  89                 startActivity(new Intent(MainActivity.this, LocationActivity.class));
  90             }
  91         });
  92
  93         /**
  94          * Help Button
  95          */
  96         helpBtn = (ImageButton)findViewById(R.id.imageButton2);
  97         helpBtn.setOnClickListener(new View.OnClickListener() {
  98             @Override
  99             public void onClick(View v) {
 100                 startActivity(new Intent(MainActivity.this, HelpActivity.class));
 101             }
 102         });
 103
 104         /**
 105          * Dialer
 106          */
 107         dial=(ImageView)findViewById(R.id.imageView);
 108         dial.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
 109             @Override
 110             public void onGlobalLayout(){
 111                 center[0]=dial.getPivotX();
 112                 center[1]=dial.getPivotY();
 113                 setDirection();
 114                 if (Build.VERSION.SDK_INT>=16){
 115                     dial.getViewTreeObserver().removeOnGlobalLayoutListener(this);
 116                 }
 117                 else {
 118                     dial.getViewTreeObserver().removeGlobalOnLayoutListener(this);
 119                 }
 120             }
 121         });
 122         dial.setOnTouchListener(new View.OnTouchListener() {
 123             @Override
 124             public boolean onTouch(View v, MotionEvent event) {
 125                 if (event.getAction() == MotionEvent.ACTION_DOWN) {
 126                     ClipData data = ClipData.newPlainText("", "");
 127                     View.DragShadowBuilder shadow = new View.DragShadowBuilder();
 128                     dial.startDrag(data, shadow, dial, 0);
 129                     return true;
 130                 } else {
 131                     return false;
 132                 }
 133             }
 134         });
 135         dial.setOnDragListener(new View.OnDragListener() {
 136             @Override
 137             public boolean onDrag(View v, DragEvent event) {
 138                 if (event.getAction() == DragEvent.ACTION_DRAG_LOCATION) {
 139                     dial.setRotation((float) getAngle(event.getX(), event.getY()));
 140                 }
 141                 else if(event.getAction()==DragEvent.ACTION_DROP){
 142                     setDirection();
 143                 }
 144                 return true;
 145             }
 146         });
 147
 148         /**
 149          * Compass
 150          */
 151         compass=(ImageView)findViewById(R.id.imageView2);
 152     }
 153
 154     @Override
 155     protected void onResume(){
 156         super.onResume();
 157         displayLocation();
 158     }
 159
 160     private double getAngle(float x, float y) {
 161         double angle;
 162         x=x-center[0];
 163         y=center[1]-y;
 164         angle=Math.toDegrees(Math.atan2(x,y));
 165         angle=dial.getRotation()+angle;
 166         return angle;
 167     }
 168
 169     private void gpsLocation(){
 170         LocationManager locationManager=(LocationManager)getSystemService(Context.LOCATION_SERVICE);
 171         try {
 172             Location loc = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
 173             if(loc==null){
 174                 loc=locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
 175             }
 176             locationData.setCoordinate(loc.getLatitude(), loc.getLongitude());
 177         }
 178         catch (SecurityException e){
 179             Toast.makeText(getApplicationContext(), "GPS Permission denied.", Toast.LENGTH_LONG).show();
 180         }
 181         catch (Exception e){
 182             Toast.makeText(getApplicationContext(), "GPS location unavailable.", Toast.LENGTH_LONG).show();
 183         }
 184     }
 185
 186     private void displayLocation(){
 187         String s="";
 188         if(locationData.getLatitude()>=0){
 189             s=s+String.format("%.2f", Math.abs(locationData.getLatitude()))+"\u00B0 N \n";
 190         }
 191         else{
 192             s=s+String.format("%.2f", Math.abs(locationData.getLatitude()))+"\u00B0 S \n";
 193         }
 194         if(locationData.getLongitude()>=0){
 195             s=s+String.format("%.2f", Math.abs(locationData.getLongitude()))+"\u00B0 E";
 196         }
 197         else{
 198             s=s+String.format("%.2f", Math.abs(locationData.getLongitude()))+"\u00B0 W";
 199         }
 200         displayLoc.setText(s);
 201     }
 202
 203     private void setDirection(){
 204         float direction=(float)CompassLogic.getAngle();
 205         direction=direction+(dial.getRotation()%360);
 206         if(Math.abs(direction-currCompass)>180){
 207             direction=(direction-360)%360;
 208         }
 209         RotateAnimation anim = new RotateAnimation(currCompass, direction, compass.getPivotX(), compass.getPivotY());
 210         anim.setInterpolator(new LinearInterpolator());
 211         anim.setDuration(500);
 212         anim.setFillAfter(true);
 213         compass.startAnimation(anim);
 214         currCompass=direction;
 215     }
 216
 217     private void nightAlert(){
 218         new AlertDialog.Builder(this)
 219                 .setTitle("Warning!")
 220                 .setMessage("Solar Compass only works during the day.\n" +
 221                         "(6 AM to 6 PM)\n" +
 222                         "Because it depends on the location of the sun in the sky to find directions.")
 223                 .setNeutralButton(android.R.string.ok, new DialogInterface.OnClickListener() {
 224                     @Override
 225                     public void onClick(DialogInterface dialog, int which) {
 226
 227                     }
 228                 })
 229                 .setIcon(android.R.drawable.ic_dialog_alert)
 230                 .show();
 231     }
 232 }