为什么getBaseStationLatitude()不断返回Integer.MAX_VALUE(未知)? [英] Why getBaseStationLatitude() keeps returning the Integer.MAX_VALUE (unknown)?
问题描述
课程项目&论文工作-尝试从CDMA Cell中提取信息，特别是通过使用getBaseStationLatitude()& getBaseStationLongitude().返回的值是MAX_VALUE(2147483647)-我没有收到实际的经/纬度. getBaseStationID()，getNetworkID()& getSystemID()返回有效的ID.我已经在2个单独的单元中对此进行了测试，但没有好运.我的代码发布在下面.两者均为ACCESS_FINE_LOCATION& ACCESS_COURSE_LOCATION添加到清单.在Android 2.2.2.Droid上进行的测试
问题-有人遇到过同样的问题吗?我在代码中缺少什么吗?这些值在哪里存储和发布(例如，这些坐标是在基站分配的，并不断发送给移动设备)?
代码:
package xXx.edu.com;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.telephony.TelephonyManager;
import android.telephony.cdma.CdmaCellLocation;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class CDMAData extends Activity implements OnClickListener{
CdmaCellLocation location;
int cellID, lat, lon, netID, sysID;
private Context context;
Button getDataBtn;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
context = (Context) this;
setContentView(R.layout.cid);
setConnections();
}
private void setConnections() {
getDataBtn = (Button) this.findViewById(R.id.getID);
getDataBtn.setOnClickListener(this);
}
public void onClick(View v) {
TelephonyManager tm = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
location = (CdmaCellLocation) tm.getCellLocation();
cellID = location.getBaseStationId();
lat = location.getBaseStationLatitude();
lon = location.getBaseStationLongitude();
netID = location.getNetworkId();
sysID = location.getSystemId();
TextView myView1 = (TextView) findViewById(R.id.bsID);
myView1.setText("" + cellID);
TextView myView2 = (TextView) findViewById(R.id.bsLat);
myView2.setText("" + lat);
TextView myView3 = (TextView) findViewById(R.id.bsLon);
myView3.setText("" + lon);
TextView myView4 = (TextView) findViewById(R.id.netID);
myView4.setText("" + netID);
TextView myView5 = (TextView) findViewById(R.id.sysID);
myView5.setText("" + sysID);
}
}
原因如下:
纬度是3GPP2 C.S0005-A v6.0中指定的十进制数. 以0.25秒为单位表示，范围从-1296000到 1296000(包括两个值)(对应于-90到+90的范围 度). Integer.MAX_VALUE被视为无效值.
经度是3GPP2 C.S0005-A v6.0中指定的十进制数.它 以0.25秒为单位表示，范围从-2592000到 2592000(包括两个值)(对应于-180至 +180度). Integer.MAX_VALUE被视为无效值.
说:
Latitude = L(Android cdma API返回的整数)
纬度=((L * 90)/1296000))
现在，您可以轻松地将其转换为分钟和秒的度数: 以下是执行此操作的URL(以下任何链接均应起作用): http://zonalandeducation.com/mmts/trigonometryRealms/degMinSec/degMinSec.htm
http://www.fcc.gov/mb/audio/bickel/DDDMMSS-decimal.html
Class project & thesis work - trying to pull information from CDMA Cell, specifically by using the getBaseStationLatitude() & getBaseStationLongitude(). The value being returned is the MAX_VALUE (2147483647) - I'm not receiving actual lat/longs. getBaseStationID(), getNetworkID() & getSystemID() are returning valid id's. I've tested this in 2 separate cells with no luck. My code is posted below. Both ACCESS_FINE_LOCATION & ACCESS_COURSE_LOCATION are added to manifest. Testing done on Droid, Android 2.2.2.
Questions - Has anyone run into same problems? Am I missing something in the code? Where are these values stored and issued at (e.g. are these coordinates assigned at the base station, and constantly being transmitted to mobile device)?
Code:
package xXx.edu.com;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.telephony.TelephonyManager;
import android.telephony.cdma.CdmaCellLocation;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class CDMAData extends Activity implements OnClickListener{
CdmaCellLocation location;
int cellID, lat, lon, netID, sysID;
private Context context;
Button getDataBtn;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
context = (Context) this;
setContentView(R.layout.cid);
setConnections();
}
private void setConnections() {
getDataBtn = (Button) this.findViewById(R.id.getID);
getDataBtn.setOnClickListener(this);
}
public void onClick(View v) {
TelephonyManager tm = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
location = (CdmaCellLocation) tm.getCellLocation();
cellID = location.getBaseStationId();
lat = location.getBaseStationLatitude();
lon = location.getBaseStationLongitude();
netID = location.getNetworkId();
sysID = location.getSystemId();
TextView myView1 = (TextView) findViewById(R.id.bsID);
myView1.setText("" + cellID);
TextView myView2 = (TextView) findViewById(R.id.bsLat);
myView2.setText("" + lat);
TextView myView3 = (TextView) findViewById(R.id.bsLon);
myView3.setText("" + lon);
TextView myView4 = (TextView) findViewById(R.id.netID);
myView4.setText("" + netID);
TextView myView5 = (TextView) findViewById(R.id.sysID);
myView5.setText("" + sysID);
}
}
Here is why:
Latitude is a decimal number as specified in 3GPP2 C.S0005-A v6.0.It is represented in units of 0.25 seconds and ranges from -1296000 to 1296000, both values inclusive (corresponding to a range of -90 to +90 degrees). Integer.MAX_VALUE is considered invalid value.
Longitude is a decimal number as specified in 3GPP2 C.S0005-A v6.0. It is represented in units of 0.25 seconds and ranges from -2592000 to 2592000, both values inclusive (corresponding to a range of -180 to +180 degrees). Integer.MAX_VALUE is considered invalid value.
Say:
Latitude = L (integer as returned by Android cdma API)
Latitude in degree = (( L * 90)/1296000))
Now you can easily convert it to degree min and seconds: Following is the URL to do that(any of the following links should work): http://zonalandeducation.com/mmts/trigonometryRealms/degMinSec/degMinSec.htm
http://www.fcc.gov/mb/audio/bickel/DDDMMSS-decimal.html
这篇关于为什么getBaseStationLatitude()不断返回Integer.MAX_VALUE(未知)?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
