android 模拟器上GPS的使用

之前一直是在自己的G2上运行程序，最近在做GPS的应用，想想别人要是没有真机那怎么开发GPS？

所以自己还是把这个问题解决一下吧，免得有的新手不知道怎么配置...

好了，废话到此，转入正题...

JAVA代码：

package com.GPSTest; import android.app.Activity; import android.content.Context; import android.location.Criteria; 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 GPSTestActivity extends Activity { private static final String TAG = "GPSTestActivity"; private Location preLocation; private long preTime; private static final int step = 2000; // msecs 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) 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); preTime = System.currentTimeMillis(); updateWithNewLocation(location); locationManager.requestLocationUpdates(provider, step, 0, locationListener); } public void stopLocationService() { if (locationManager != null) { locationManager.removeUpdates(locationListener); } } private final LocationListener locationListener = new LocationListener() { public void onLocationChanged(Location location) { Log.i(TAG, "onLocationChanged(Location location)"); updateWithNewLocation(location); } public void onProviderDisabled(String provider) { updateWithNewLocation(null); } public void onProviderEnabled(String provider) { } public void onStatusChanged(String provider, int status, Bundle extras) { } }; private void updateWithNewLocation(Location location) { Log.i(TAG, "updateWithNewLocation(Location location)"); String latLongString; TextView myLocationText; myLocationText = (TextView) findViewById(R.id.result); if (location != null) { double lat = location.getLatitude(); double lng = location.getLongitude(); 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>

加上权限：

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"></uses-permission>

GPS数据模拟方法：

打开DDMS视图，找到Emulator Control，在Manual里面选择Sexagesimal,输入Longitude和Latitude，点击Send.至此完成测试.

另外也有在cmd下面模拟GPS经纬度信息的，那个自己找找，我就没空找了.

今天再测试了一下另外一个用Google Apis 8的模拟器，果断发现用不了

为什么？搞了半天还以为是SDK的问题，原来是GPS设置的问题，模拟器上GPS设置如下就行了：

但是我的G2上使用无线网络和GPS都选了也可以正常运行...原因何在？难道模拟器真的SB了？它不会自动选择GPS而是选择network作为provider?

加入测试代码：

String provider = locationManager.getBestProvider(criteria, true); //让机器自己选择最好的Provider Log.d(TAG, "Provider:"+provider);

经过测试发现应验如下：

1.两个都选择的时候：

我们可以看到LogCat中输出信息为"Provider : network"!!!

2.只选GPS的时候

LogCat中为“Provider:gps”

综上,要想在模拟器上使用GPS来定位，有两种方法设置provider

1.如上面所述，只选择GPS来定位，不用无线网络

2.在代码中规定只能用GPS来定位，如：

String provider = LocationManager.GPS_PROVIDER;

当然F3就知道GPS_PROVIDER其实就是"gps";

所以如下这样也是可行的：

String provider ="gps";

至此，GPS和Google Apis 8在模拟器上结合使用的问题应该就完全解决了。

好了，饭饭去了...哈哈