java - 代号一 GPS 提供商和当前位置
<p><p>我正在使用 <a href="https://www.codenameone.com" rel="noreferrer noopener nofollow">codename one</a> 开发 iOS 应用程序.我想获取当前位置并通过短信发送。</p>
<p>我从 Java Android Studio 得到这段代码，我不知道如何获取当前位置以及检查 GPS 是否打开。</p>
<p>我在下面尝试过，但没有成功(我不确定他们如何启动 GPS 并获取位置)</p>
<pre><code>LocationManager service = (LocationManager) getSystemService(LOCATION_SERVICE);
boolean enabledGPS = service.isProviderEnabled(LocationManager.GPS_PROVIDER);
if (!enabledGPS) {
//alert GPS is off
}
LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
// Define the criteria how to select the location provider -> use
// default
Criteria criteria = new Criteria();
provider = locationManager.getBestProvider(criteria, false);
Location location = locationManager.getLastKnownLocation(provider);
// Initialize the location fields
if (location != null) {
Toast.makeText(this, "Provider: " + provider, Toast.LENGTH_SHORT).show();
onLocationChanged(location);
} else {
//do something
}
</code></pre>
<p><strong>onLocationChanged 方法:</strong></p>
<pre><code>try {
StringBuffer smsBody = new StringBuffer();
smsBody.append("http://maps.google.com/?q=");
smsBody.append(gpsLocation.getLatitude());
smsBody.append(",");
smsBody.append(gpsLocation.getLongitude());
String phnum="xxxxx";
String smsbod= smsBody.toString();
Display.getInstance().sendSMS(phnum,smsbod);
} catch (IOException ex) {
Dialog.show("Error!", "Failed to start.installed?", "OK", null);
ex.printStackTrace();
}
</code></pre></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>你不能在codenameone中启动GPS，你只能检查它是否打开，如果没有打开则显示一条消息。</p>
<p>试试下面的代码:</p>
<pre><code>//Check if location is turned on and your app is allowed to use it.
if (Display.getInstance().getLocationManager().isGPSDetectionSupported()) {
if (Display.getInstance().getLocationManager().isGPSEnabled()) {
InfiniteProgress ip = new InfiniteProgress();
final Dialog ipDlg = ip.showInifiniteBlocking();
//Cancel after 20 seconds
Location loc = LocationManager.getLocationManager().getCurrentLocationSync(20000);
ipDlg.dispose();
if (loc != null) {
double lat = loc.getLatitude();
double lng = loc.getLongitude();
try {
Display.getInstance().sendSMS("09123456789", "http://maps.google.com/?q=" + lat + "," + lng, false);
} catch (IOException ex) {
Dialog.show("Error!", "Failed to start.installed?", "OK", null);
ex.printStackTrace();
}
} else {
Dialog.show("GPS error", "Your location could not be found, please try going outside for a better GPS signal", "Ok", null);
}
} else {
Dialog.show("GPS disabled", "AppName needs access to GPS. Please enable GPS", "Ok", null);
}
} else {
InfiniteProgress ip = new InfiniteProgress();
final Dialog ipDlg = ip.showInifiniteBlocking();
//Cancel after 20 seconds
Location loc = LocationManager.getLocationManager().getCurrentLocationSync(20000);
ipDlg.dispose();
if (loc != null) {
double lat = loc.getLatitude();
double lng = loc.getLongitude();
try {
Display.getInstance().sendSMS("09123456789", "http://maps.google.com/?q=" + lat + "," + lng, false);
} catch (IOException ex) {
Dialog.show("Error!", "Failed to start.installed?", "OK", null);
ex.printStackTrace();
}
} else {
Dialog.show("GPS error", "Your location could not be found, please try going outside for a better GPS signal", "Ok", null);
}
}
</code></pre></p>
<p style="font-size: 20px;">关于java - 代号一 GPS 提供商和当前位置，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/35122294/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/35122294/
</a>
</p>
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