Android怎么实现点击按钮获取当前位置的信息，没有地图的情况下。

1、首先，检查那个供应商是有效的。有些在设备上可能没效，有些可能在应用程序清单中无效。

2、如果有有效的供应商，启动位置监听和路由失效定时器。

3、如果从位置监听器获得更新，用供应的值，停止监听器和定时器。

4、如果没有获得更新，并且时间已经结束，那就用最后一个已知值。

5、从有效供应商获取最后一个已知值并且选择最接近的。

class MyLocation{

/

If GPS is enabled

Use minimal connected satellites count

/

private static final int min_gps_sat_count = 5;

/

Iteration step time

/

private static final int iteration_timeout_step = 500;

LocationResult locationResult;

private Location bestLocation = null;

private Handler handler = new Handler();

private LocationManager myLocationManager;

public Context context;

private boolean gps_enabled = false;

private int counts = 0;

private int sat_count = 0;

private Runnable showTime = new Runnable() {

public void run() {

boolean stop = false;

counts++;

Systemprintln("counts=" + counts);

//if timeout (1 min) exceeded, stop tying

if(counts > 120){

stop = true;

}

//update last best location

bestLocation = getLocation(context);

//if location is not ready or don`t exists, try again

if(bestLocation == null && gps_enabled){

Systemprintln("BestLocation not ready, continue to wait");

handlerpostDelayed(this, iteration_timeout_step);

}else{

//if best location is known, calculate if we need to continue to look for better location

//if gps is enabled and min satellites count has not been connected or min check count is smaller then 4 (2 sec)

if(stop == false && !needToStop()){

Systemprintln("Connected " + sat_count + " sattelites continue waiting");

handlerpostDelayed(this, iteration_timeout_step);

}else{

Systemprintln("#########################################");

Systemprintln("BestLocation finded return result to main sat_count=" + sat_count);

Systemprintln("#########################################");

// removing all updates and listeners

myLocationManagerremoveUpdates(gpsLocationListener);

myLocationManagerremoveUpdates(networkLocationListener);

myLocationManagerremoveGpsStatusListener(gpsStatusListener);

sat_count = 0;

// send best location to locationResult

locationResultgotLocation(bestLocation);

}

}

}

};

/

Determine if continue to try to find best location

/

private Boolean needToStop(){

if(!gps_enabled){

return true;

}

else if(counts <= 4){

return false;

}

if(sat_count < min_gps_sat_count){

//if 20-25 sec and 3 satellites found then stop

if(counts >= 40 && sat_count >= 3){

return true;

}

return false;

}

}

return true;

}

/

Best location abstract result class

/

public static abstract class LocationResult{

public abstract void gotLocation(Location location);

}

/

Initialize starting values and starting best location listeners

@param Context ctx

@param LocationResult result

/

public void init(Context ctx, LocationResult result){

context = ctx;

locationResult = result;

myLocationManager = (LocationManager) contextgetSystemService(ContextLOCATION_SERVICE);

gps_enabled = (Boolean) myLocationManagerisProviderEnabled(LocationManagerGPS_PROVIDER);

bestLocation = null;

counts = 0;

// turning on location updates

myLocationManagerrequestLocationUpdates("network", 0, 0, networkLocationListener);

myLocationManagerrequestLocationUpdates("gps", 0, 0, gpsLocationListener);

myLocationManageraddGpsStatusListener(gpsStatusListener);

// starting best location finder loop

handlerpostDelayed(showTime, iteration_timeout_step);

}

/

GpsStatus listener OnChainged counts connected satellites count

/

public final GpsStatusListener gpsStatusListener = new GpsStatusListener() {

public void onGpsStatusChanged(int event) {

if(event == GpsStatusGPS_EVENT_SATELLITE_STATUS){

try {

// Check number of satellites in list to determine fix state

GpsStatus status = myLocationManagergetGpsStatus(null);

Iterable<GpsSatellite>satellites = statusgetSatellites();

sat_count = 0;

Iterator<GpsSatellite>satI = satellitesiterator();

while(satIhasNext()) {

GpsSatellite satellite = satInext();

Systemprintln("Satellite: snr=" + satellitegetSnr() + ", elevation=" + satellitegetElevation());

sat_count++;

}

} catch (Exception e) {

eprintStackTrace();

sat_count = min_gps_sat_count + 1;

}

Systemprintln("#### sat_count = " + sat_count);

}

}

};

/

Gps location listener

/

public final LocationListener gpsLocationListener = new LocationListener(){

@Override

public void onLocationChanged(Location location){

}

public void onProviderDisabled(String provider){}

public void onProviderEnabled(String provider){}

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

};

/

Network location listener

/

public final LocationListener networkLocationListener = new LocationListener(){

@Override

public void onLocationChanged(Location location){

}

public void onProviderDisabled(String provider){}

public void onProviderEnabled(String provider){}

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

};

/

Returns best location using LocationManagergetBestProvider()

@param context

@return Location|null

/

public static Location getLocation(Context context){

Systemprintln("getLocation()");

// fetch last known location and update it

try {

LocationManager lm = (LocationManager) contextgetSystemService(ContextLOCATION_SERVICE);

Criteria criteria = new Criteria();

criteriasetAccuracy(CriteriaACCURACY_FINE);

criteriasetAltitudeRequired(false);

criteriasetBearingRequired(false);

criteriasetCostAllowed(true);

String strLocationProvider = lmgetBestProvider(criteria, true);

Systemprintln("strLocationProvider=" + strLocationProvider);

Location location = lmgetLastKnownLocation(strLocationProvider);

if(location != null){

return location;

}

return null;

} catch (Exception e) {

eprintStackTrace();

return null;

}

}

}

home键在KeyEvent中的键值为3

ublic static final int KEYCODE_HOME            = 3;

当用户按下home键的时候(包括长按)，程序会进入到PhoneWindowManagerjava类中的public boolean interceptKeyBeforeDispatching(WindowState win, int action, int flags,int keyCode, int scanCode, int metaState, int repeatCount, int policyFlags)这个方法中进行处理。如果用户是连续点击home，此时就要执行长按home事件了。

即执行mHandlerpostDelayed(mHomeLongPress,ViewConfigurationgetGlobalActionKeyTimeout());对应的代码。也就会跳转到mHomeLongPress这个Runnable接着往下执行。

interceptKeyBeforeDispatching这个方法位于PhoneWindowManagerjava中。

位置为：\frameworks\base\policy\src\com\android\internal\policy\impl\PhoneWindowManagerjava  

public boolean interceptKeyBeforeDispatching(WindowState win, int action, int flags,  

            int keyCode, int scanCode, int metaState, int repeatCount, int policyFlags) {  

        final boolean down = (action == KeyEventACTION_DOWN);  

          

        //4、用户按下home，然后马上释放。此时这个条件成立。将之前postDelayed的事件remove掉。此时就不会执行长按home事件。  

        if ((keyCode == KeyEventKEYCODE_HOME) && !down) {  

            mHandlerremoveCallbacks(mHomeLongPress);  

        }  

        //5、第一次按下home，mHomePressed为false。  

        if (mHomePressed) {  

            if (keyCode == KeyEventKEYCODE_HOME) {  

            //a、如果用户连续按下home，此时暂时没有up事件。所以就不走这里。  

            //b、如果用户没有连续按下home，此时过来的是up(move或者>

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