package com.yiba.core;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.location.LocationManager;/** * Created by ${zhaoyanjun} on 2017/3/29. * GPS 開關監聽 */public class GPS_Presenter {  private Context mContext ;  private Receiver receiver ;  private GPS_Interface mInterface ;  private String GPS_ACTION = "android.location.PROVIDERS_CHANGED" ;  public GPS_Presenter(Context context , GPS_Interface mInterface ){    this.mContext = context ;    this.mInterface = mInterface ;    observeWifiSwitch();  }  private void observeWifiSwitch(){    IntentFilter filter = new IntentFilter();    filter.addAction( GPS_ACTION );    receiver = new Receiver() ;    mContext.registerReceiver(receiver, filter);  }  /**   * 釋放資源   */  public void onDestroy(){    if ( receiver != null ){      mContext.unregisterReceiver( receiver );    }    if (mContext!=null){      mContext = null;    }  }  class Receiver extends BroadcastReceiver {    @Override    public void onReceive(Context context, Intent intent) {      if (intent.getAction().matches( GPS_ACTION )) {         if ( mInterface != null ){           mInterface.gpsSwitchState( gpsIsOpen( context ));         }      }    }  }  /**   * 判斷GPS是否開啟，GPS或者AGPS開啟一個就認為是開啟的   * @param context   * @return true 表示開啟   */  public boolean gpsIsOpen(final Context context) {    LocationManager locationManager        = (LocationManager) context.getApplicationContext().getSystemService(Context.LOCATION_SERVICE);    // 通過GPS衛星定位，定位級別可以精確到街（通過24顆衛星定位，在室外和空曠的地方定位準確、速度快）    boolean gps = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);    // 通過WLAN或移動網絡(3G/2G)確定的位置（也稱作AGPS，輔助GPS定位。主要用于在室內或遮蓋物（建筑群或茂密的深林等）密集的地方定位）    boolean network = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);    if (gps || network) {      return true;    }    return false;  }}

package com.yiba.core;/** * Created by ${zhaoyanjun} on 2017/3/29. * gps 開關監聽 */public interface GPS_Interface {  void gpsSwitchState( boolean gpsOpen );}

package com.yiba.core;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.widget.Toast;public class MainActivity extends AppCompatActivity implements GPS_Interface {  private GPS_Presenter gps_presenter ;  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    gps_presenter = new GPS_Presenter( this , this ) ;  }  @Override  protected void onDestroy() {    super.onDestroy();    //釋放資源    if ( gps_presenter != null ){      gps_presenter.onDestroy();    }  }  @Override  public void gpsSwitchState(boolean gpsOpen) {    if ( gpsOpen ){      Toast.makeText(this, " 手機GPS 打開", Toast.LENGTH_SHORT).show();    }else {      Toast.makeText(this, " 手機GPS 關閉", Toast.LENGTH_SHORT).show();    }  }}