全球定位系统关闭后不更新位置，并重新对Android应用程序 [英] GPS not update location after close and reopen app on android

问题描述

在我结束我的应用程序了一会儿，然后再重新打开它，我的应用程序将不会更新位置或 有时它会更新前需要很长时间（约5分钟）。 我该如何解决这个问题？这是我的code

 私人LocationManager流明;
私人LocationListener的LocationListener的;

  公共无效的onCreate（包savedInstanceState）{
    super.onCreate（savedInstanceState）;
    的setContentView（R.layout.main）;

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

    LocationListener的=新mLocationListener（）;

    lm.requestLocationUpdates（
        LocationManager.GPS_PROVIDER，0，0，LocationListener的）; }


私有类myLocationListener实现LocationListener的
{
    @覆盖
    公共无效onLocationChanged（位置LOC）{
        如果（LOC！= NULL）{
            TextView的gpsloc =（TextView中）findViewById（R.id.widget28）;
            gpsloc.setText（纬度：+ loc.getLatitude（）+LNG：+ loc.getLongitude（））;
        }
    }

    @覆盖
    公共无效onProviderDisabled（字符串提供商）{
        // TODO自动生成方法存根
        TextView的gpsloc =（TextView中）findViewById（R.id.widget28）;
        gpsloc.setText（GPS离线。）;
    }

    @覆盖
    公共无效onProviderEnabled（字符串提供商）{
        // TODO自动生成方法存根
    }

    @覆盖
    公共无效onStatusChanged（字符串商，INT地位，
        捆绑演员）{
        // TODO自动生成方法存根
    }
}
 

解决方案

有几件事情...

什么是可能发生的是你的应用程序正在恢复，而不是创造的第二的时间。如果你想让它每次活动被视为时间寻找一个新的位置，你会想要移动以下code到 onResume（）方法：

  lm.requestLocationUpdates（
    LocationManager.GPS_PROVIDER，0，0，LocationListener的）; }
 

你还需要确保你注销了的onPause（）方法您LocationListener的。像这样的东西应该这样做：

  @覆盖
公共无效的onPause（）{
    lm.removeUpdates（LocationListener的）;
    super.onPause（）;
}
 

看起来你对这个行一个错字：

  LocationListener的=新mLocationListener（）;
 

我想应该是：

  LocationListener的=新myLocationListener（）;
 

此外，如别人所说，有没有必要创建一个全新的类作为您LocationListener的。事实上，它会燃烧起来不必要的内存和移动设备内存在premium。

所有的东西的结合上面会离开你的Activity看起来像这样：

After I closed my app for a while then reopen it again,my app will not update location or sometime it will take long time( about 5min) before update. How can I fix it? This is my code

  private LocationManager lm;
private LocationListener locationListener;

  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);    

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

    locationListener = new mLocationListener();

    lm.requestLocationUpdates(
        LocationManager.GPS_PROVIDER, 0, 0, locationListener); }


private class myLocationListener implements LocationListener 
{
    @Override
    public void onLocationChanged(Location loc) {
        if (loc != null) {
            TextView gpsloc = (TextView) findViewById(R.id.widget28);
            gpsloc.setText("Lat:"+loc.getLatitude()+" Lng:"+ loc.getLongitude());
        }
    }

    @Override
    public void onProviderDisabled(String provider) {
        // TODO Auto-generated method stub
        TextView gpsloc = (TextView) findViewById(R.id.widget28);
        gpsloc.setText("GPS OFFLINE.");
    }

    @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
    }
}

解决方案

A few things...

What's probably happening is your app is being resumed and not created the "second" time. If you want it to look for a new location every time the activity is viewed you'll want to move the following code into the onResume() method:

lm.requestLocationUpdates(
    LocationManager.GPS_PROVIDER, 0, 0, locationListener); }

You'll also want to make sure you unregister your LocationListener in the onPause() method. Something like this should do it:

@Override
public void onPause() {
    lm.removeUpdates(locationListener);
    super.onPause();
}

It looks like you have a typo on this line:

locationListener = new mLocationListener();

I think it should be:

locationListener = new myLocationListener();

Also, as someone else mentioned, there's no reason to create a whole new class to act as your LocationListener. In fact, it'll burn up memory unnecessarily and on mobile devices memory is at a premium.

The combination of all of the things above would leave your Activity looking something like this:

public class Whatever extends Activity implements LocationListener {
    private LocationManager lm;
    private LocationListener locationListener;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);    

        lm = (LocationManager)  getSystemService(Context.LOCATION_SERVICE);    
        locationListener = new mLocationListener();
    }

    @Override 
    public void onResume() {
        lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 1, this);
        super.onResume();
    }

    @Override
    public void onPause() {
        lm.removeUpdates(this);
        super.onPause();
    }

    @Override
    public void onLocationChanged(Location loc) {
        if (loc != null) {
            TextView gpsloc = (TextView) findViewById(R.id.widget28);
            gpsloc.setText("Lat:"+loc.getLatitude()+" Lng:"+ loc.getLongitude());
        }
    }

    @Override
    public void onProviderDisabled(String provider) {
        TextView gpsloc = (TextView) findViewById(R.id.widget28);
        gpsloc.setText("GPS OFFLINE.");
    }

    @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
    }
}

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