membuat qibla locator

Setiap titik dibumi dapat dinyatakan dalam longtitude dan latitude

rumus untuk menghitung adalah

cos(y) = cos(x)cos(y)+sin(x)sin(z)cos(B)

cos(z)= cos(x)cos(y)+sin(x)sin(y)cos(C)

sin(x)/sin(A)=sin(y)/sin(B)=sin(z)/sin(C)

dari tiga rumus diatas di gabungin jadi

tan(B) = sin(C)/sin(x)cot(y)-cos(a)cos(C)

C = Bx-By

x = 90 – Ly

y = 90 – Lx

dan

cos(90-x)=sin(x)

sin(90-x)=cos(x)

cot(90-x)=tan(x)

maka persamaan akan menjadi

tan(B)=sin(Bx-By)/cos(Ly)tan(Lx) sin(Ly)cos(Bx By)

sudut B = archtan(tan(B))

titik A = posisi kita

titik B = posisi ka'bah

titik C = kutub utara

Arah kiblat azimuth ditunjukan sudut B.

secara matematis penghitungan arah kiblat seperti ini

secara program seperti ini

MainActivity.java

package com.baunAndroid;

import android.app.Activity;

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.graphics.Path;

import android.hardware.Sensor;

import android.hardware.SensorEvent;

import android.hardware.SensorEventListener;

import android.hardware.SensorManager;

import android.location.Location;

import android.location.LocationListener;

import android.location.LocationManager;

import android.os.Bundle;

import android.util.Config;

import android.util.Log;

import android.view.View;

public class MainActivity extends Activity {

    /** Called when the activity is first created. */

private static final String TAG = "Compass";

private SensorManager mSensorManager;

private Sensor mSensor;

private SampleView mView;

private float[] mValues;

private double lonMosque;

private double latMosque;

private LocationManager lm;

private LocationListener loclistenD;

//for find north direction

private final SensorEventListener mListener = new SensorEventListener(){

public void onAccuracyChanged(Sensor sensor, int accuracy){

}

};

    @Override

    public void onCreate(Bundle icicle) {

        super.onCreate(icicle);

        setContentView(R.layout.main);

        mSensorManager = (SensorManager)getSystemService(Context.SENSOR_SERVICE);

        mSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION);

        mView = new SampleView(this);

        setContentView(mView);

        //calling gps

        LocationManager lm = (LocationManager)getSystemService(Context.LOCATION_SERVICE);

        Location loc= lm.getLastKnownLocation("gps");

        //ask the location manager to send us location updates.

        loclistenD = new DispLocListener();

        lm.requestLocationUpdates("gps",30000l,10.0f,loclistenD);

        loclistenD = new DispLocListener();

        lm.requestLocationUpdates("gps",30000l,10.0f,loclistenD);

    }

    //finding ka'bah location

    

    private double QiblaCount(double lngMasjid,double latMasjid){

    double lngKabah= 39.82616111;

    double latKabah= 21.42250833;

    double lKlM= (lngKabah - lngMasjid);

    double sinLKLM= Math.sin(lKlM*2.0*Math.PI/360);

    double cosLKLM= Math.cos(lKlM*2.0*Math.PI/360);

    double sinLM = Math.sin(latMasjid*2.0*Math.PI/360);

    double cosLM = Math.cos(latMasjid*2.0*Math.PI/360);

    double tanLK = Math.tan(latKabah*2*Math.PI/360);

    double denominator = (cosLM*tanLK)-sinLM*cosLKLM;

    double Qibla;

    double direction;

    Qibla = Math.atan2(sinLKLM, denominator)*180/Math.PI;

    direction = Qibla < 0 ? Qibla+360 : Qibla;

    return direction;

    }

    //resume location update when we are resume

    @Override

    protected void onResume(){

    super.onResume();

    mSensorManager.registerListener(mListener, mSensor, SensorManager.SENSOR_DELAY_GAME);

    }

    @Override

    super.onStop();

    }

    private class SampleView extends View {

    private Paint mPaint = new Paint();

    private Path mPath = new Path();

    private boolean mAnimate;

public SampleView(Context context) {

super(context);

// TODO Auto-generated constructor stub

mPath.moveTo(0, -50);

mPath.lineTo(20, 60);

mPath.lineTo(0, 50);

mPath.lineTo(-20, 60);

mPath.close();

}

//Make arrow for pointing direction

@Override

protected void onDraw(Canvas canvas){

Paint paint = mPaint;

canvas.drawColor(Color.WHITE);

paint.setAntiAlias(true);

paint.setColor(Color.DKGRAY);

paint.setStyle(Paint.Style.FILL_AND_STROKE);

int w = canvas.getWidth();

int h = canvas.getHeight();

int cx = w/2;

int cy = h/2;

float Qibla = (float) QiblaCount(lonMosque,latMosque);

// float Qibla = mValues[0] + Qibla;

canvas.translate(cx, cy);

if (mValues != null){

canvas.rotate(-(mValues[0]+ Qibla));

}

canvas.drawPath(mPath, mPaint);

}

@Override

protected void onAttachedToWindow(){

mAnimate = true;

super.onAttachedToWindow();

}

@Override

protected void onDetachedFromWindow(){

mAnimate = false;

super.onDetachedFromWindow();

}

    }

    private class DispLocListener implements LocationListener{

    @Override

    public void onLocationChanged(Location loc){

    //update TextViews

    latMosque = loc.getLatitude();

    lonMosque = loc.getLongitude();

    }

@Override

public void onProviderDisabled(String provider) {

// TODO Auto-generated method stub

}

@Override

public void onProviderEnabled(String provider) {

// TODO Auto-generated method stub

}

@Override

public void onStatusChanged(String provider, int status, Bundle extras) {

// TODO Auto-generated method stub

}

}

}

manifestnya 

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.baunAndroid"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="8" />

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

    <application

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name" >

        <activity

            android:name=".MainActivity"

            android:label="@string/app_name" >

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>

</manifest>

ketika di launch akan keluar

run dengan menekan ctrl+f11