android编写gps定位时在模拟器上为什么无法获取地理位置呢
Java代码
package com.hsh.Activity;
import java.net.ContentHandler;
import java.util.List;
import android.app.Activity;
import android.content.Context;
import android.location.Address;
import android.location.Criteria;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
public class GpsActivity extends Activity {
private static final String TAG = "GPSTestActivity";
private Location preLocation;
private long preTime;
private static final int step = 2000; // msecs
private static final String Content = null;
private LocationManager locationManager;
private boolean status = false;
private Button btn;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Log.i(TAG, "onCreate(Bundle savedInstanceState)");
btn = (Button) findViewById(R.id.beginBtn);
btn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
if (!status) {
status = true;
startLoactionService();
btn.setText("点击这里停止");
} else {
status = false;
stopLocationService();
btn.setText("点击这里开始");
}
}
});
}
public void startLoactionService() {
String serviceName = Context.LOCATION_SERVICE;
//LocationManager locationManager;///
locationManager = (LocationManager) getSystemService(serviceName);
// String provider = LocationManager.GPS_PROVIDER;///
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
criteria.setAltitudeRequired(false);
criteria.setBearingRequired(false);
criteria.setCostAllowed(true);
criteria.setPowerRequirement(Criteria.POWER_LOW);
String provider = locationManager.getBestProvider(criteria, true);
Location location = locationManager.getLastKnownLocation(provider);
updateWithNewLocation(location);///
preTime = System.currentTimeMillis();
updateWithNewLocation(location);
locationManager.requestLocationUpdates(provider, step, 0,
locationListener); //注册一个周期性的位置更新。这句代码告诉系统，我们需要从GPS获取位置信息，并且是每隔1000ms更新一次，并且不考虑位置的变化。最后一个参数是LocationListener的一个引用，我们必须要实现这个类
}
public void stopLocationService() {
if (locationManager != null) {
locationManager.removeUpdates(locationListener);
}
}
private final LocationListener locationListener = new LocationListener() {
public void onLocationChanged(Location location) { //当坐标改变时触发此函数，如果Provider传进相同的坐标，它就不会被触发
// log it when the location changes
Log.i(TAG, "onLocationChanged(Location location)");
//Log.i("SuperMap","LocationChange:Lat"+location.getLatitude()+"Lng:"+location.getLongitude());///
updateWithNewLocation(location);
}
public void onProviderDisabled(String provider) {
updateWithNewLocation(null);// Provider被disable时触发此函数，比如GPS被关闭
}
public void onProviderEnabled(String provider) { // Provider被enable时触发此函数，比如GPS被打开
}
public void onStatusChanged(String provider, int status, Bundle extras) {
// Provider的转态在可用、暂时不可用和无服务三个状态直接切换时触发此函数
}
};
private void updateWithNewLocation(Location location) {
Log.i(TAG, "updateWithNewLocation(Location location)");
String latLongString;
TextView myLocationText;
myLocationText = (TextView) findViewById(R.id.result);
//myLocationText=(TextView)findViewById(R.id.myLocationText);///
if (location != null) {
double lat = location.getLatitude(); //经度
double lng = location.getLongitude(); //纬度
long subTime = (System.currentTimeMillis() - preTime) / 1000;
float v = (subTime == 0 || preLocation == null) ? 0 : (preLocation
.distanceTo(location) / subTime);
latLongString = "纬度:" + lat + " 经度:" + lng + " 速度:" + v + " m/s , "
+ v * 3.6 + " km/h";
preLocation = location;
preTime = System.currentTimeMillis();
} else {
latLongString = "无法获取地理信息";
}
myLocationText.setText(System.currentTimeMillis() + ": "
+ latLongString);
}
}
xml代码
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<Button
android:id="@+id/beginBtn"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="start"
/>
<TextView
android:id="@+id/result"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="data"
/>
</LinearLayout>
[解决办法]
好象你还得在google上注册下，得到一个什么密文什么的！！！
[解决办法]
模拟器不包含能接收gps信号的硬件，这个要得到真实的gps数据，必须在提供gps功能的真机上才能使用。
模拟器上，倒是提供了一个测试的接口，你可以通过DDMS把一个固定的 gps 坐标传给模拟器
