构造函数中的错误 [英] error in constructor

问题描述

我如何删除此错误

how i can remove this error

Implicit super constructor Provider.Service() is undefined. Must explicitly invoke another constructor

public class GPSTracker extends Service implements LocationListener{

	 final Context context;
	boolean isGPSEnable=false;
	boolean isNetworkEnable=false;
	
	boolean canGetLocation=false;
	Location location;
	double latiude;
	double longitude;
	private static final long min_time_between_updates=1000*60*1;
	private static final long min_diatance_cahnge_for_updates=10;
	
	protected LocationManager locationManager;
	
	
	
	public GPSTracker(Context context) {
	
	this.context=context;
	getlocation();
	
	}
	

	public Location getlocation(){
		try{
			locationManager=(LocationManager)context.getSystemService(Context.LOCATION_SERVICE);
			isGPSEnable=locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
			isNetworkEnable=locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);			
			
			if (isGPSEnable&&!isNetworkEnable) {
				
			}
			else{
				
				
				this.canGetLocation=true;
				if(isNetworkEnable){
					locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER,min_time_between_updates, 
							min_diatance_cahnge_for_updates,  this);
					if(locationManager!=null){
						
						location=locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
						if(location!=null){
							latiude=location.getLatitude();
							longitude=location.getLongitude();							
						}//third inner						
					}//inner second					
				}//main if
				if(isGPSEnable){
					locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,min_time_between_updates, 
							min_diatance_cahnge_for_updates,  this);
					if(locationManager!=null){
						
						location=locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
						if(location!=null){
							latiude=location.getLatitude();
							longitude=location.getLongitude();							
						}//third inner						
					}//inner second					
				}//main if
				
				
				
				
			}
			
			
			
		}catch(Exception e){			
			e.printStackTrace();			
		}

推荐答案

有时，当您进行项目设置时，Eclipse会出现此错误 - 系统配置不匹配。



例如，如果您将Java 1.7项目导入Eclipse并且没有正确设置1.7，那么您将收到此错误。然后你可以去Project - Preference - Java - Compiler并切换到1.6或更早版本;或者转到Window - Preferences - Java - 已安装的JRE并添加/修复您的JRE 1.7安装。



您也可以尝试清理和构建工作区（菜单项目 - >清洁......）

Sometimes, Eclipse gives this error when you have project setup - system configuration mismatch.

For example if you import Java 1.7 project to Eclipse and you do not have 1.7 correctly set up then you will get this error. Then you can either go to Project - Preference - Java - Compiler and switch to 1.6 or earlier; or go to Window - Preferences - Java - Installed JREs and add/fix your JRE 1.7 installation.

You can also try to clean and build the workspace (menu Project -> Clean...)

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