title: check gps off or on every time in android
body: <p>there is a app and it would works while phone's gps is on otherwise it should not work.</p>
  
  <pre><code>public class Gps extends Activity{
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      // TODO Auto-generated method stub
      super.onCreate(savedInstanceState);
      setContentView(R.layout.gps);
      TextView txtgps = (TextView) findViewById(R.id.textView1);
  txtgps.setText("if you can see this page, it means your\n phone's gps is on");
  }
  
  
  }
  
  public class MainActivity extends Activity implements LocationListener{
  
  public static boolean isgpsenabled = false;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      if(isgpsenabled){
          Toast.makeText(getApplicationContext(), "You can work with program", Toast.LENGTH_SHORT).show();
      }else{
          Toast.makeText(getApplicationContext(), "You cant work until you turn on the gps", Toast.LENGTH_SHORT).show();
      }
  
      Button btngps = (Button) findViewById(R.id.button1);
      btngps.setOnClickListener(new OnClickListener() {
          //LocationListener locationListener = new MyLocationListener(MainActivity.this);
  
          @Override
          public void onClick(View v) {
  
              LocationManager service = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
  
              LocationListener locationListener = new MyLocationListener(MainActivity.this);
              service.requestLocationUpdates(
              LocationManager.GPS_PROVIDER, 5000, 10, locationListener);
  
              boolean enabled = service
                      .isProviderEnabled(LocationManager.GPS_PROVIDER);
              if (!enabled) {
                  Toast.makeText(getBaseContext(), "gps دستگاه را روشن کرده و دوباره تلاش کنید.", Toast.LENGTH_SHORT).show();
              }else
  
              startActivity(new Intent(MainActivity.this, Gps.class));
  
  
          }
      });
  
      }
  
  
  
  
  
  
  
  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
      // Inflate the menu; this adds items to the action bar if it is present.
      getMenuInflater().inflate(R.menu.main, menu);
      return true;
  }
  
  
  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
      // Handle action bar item clicks here. The action bar will
      // automatically handle clicks on the Home/Up button, so long
      // as you specify a parent activity in AndroidManifest.xml.
      int id = item.getItemId();
      if (id == R.id.action_settings) {
          return true;
      }
      return super.onOptionsItemSelected(item);
  }
  
  
  @Override
  public void onLocationChanged(Location location) {
      // TODO Auto-generated method stub
  
  }
  
  
  @Override
  public void onStatusChanged(String provider, int status, Bundle extras) {
      // TODO Auto-generated method stub
  
  }
  
  
  @Override
  public void onProviderEnabled(String provider) {
      // TODO Auto-generated method stub
  
  }
  public void onProviderDisabled(String provider) {
  
      if(LocationManager.GPS_PROVIDER.equals(provider)){
  
      Toast.makeText(getBaseContext(), "zzzzzzzzzzzz", Toast.LENGTH_SHORT).show();
  
  }}
  }
  
  public class MyLocationListener implements LocationListener {
  Context ctx;
  
  public MyLocationListener(MainActivity c){
      ctx = c.getApplicationContext();
  }
  @Override
  public void onLocationChanged(Location location) {
      // TODO Auto-generated method stub
  
  }
  
  @Override
  public void onStatusChanged(String provider, int status, Bundle extras) {
      // TODO Auto-generated method stub
  
  }
  
  @Override
  public void onProviderEnabled(String provider) {
      // TODO Auto-generated method stub
      MainActivity.isgpsenabled=true;
  }
  
  @Override
  public void onProviderDisabled(String provider) {
  
      if(LocationManager.GPS_PROVIDER.equals(provider)){
  
      Toast.makeText(ctx, "gps turned off", Toast.LENGTH_SHORT).show();
      MainActivity.isgpsenabled=false;
  
  }
      }
  
  }
  </code></pre>