我正在编写一个应用程序，用户可以在活动中填写表单并将其同步到Web服务。部分应用程序涉及地理定位，因此，lat和long值。我希望我的应用程序能够自动地对一个人的智能手机进行地理定位（它成功完成），然后在活动表单上自动填写TextView。我尝试了一些方法，但无济于事。谁能告诉我我哪里出错了？
这是DataEntry类： -
package application.prototype.mfb;
import android.location.Location;
import android.location.LocationManager;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;
import application.prototype.mfb.MyLocation.LocationResult;
/**
* Records a new data form entry for a favourite building
* @author DanielD
*
*/
public class DataEntry extends Activity implements OnClickListener {
Button btnClear;
Button btnSync;
EditText txtBuildingName;
EditText txtDescription;
TextView txtLongitude;
TextView txtLatitude;
Spinner project;
public static Location loc;
private static double longitude;
private static double latitude;
private static String name;
private static String description;
private static String projectString;
private static String lngString = String.valueOf(longitude);
private static String latString = String.valueOf(latitude);
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_data_entry);
LocationResult locationResult = new LocationResult(){
@Override
public void gotLocation(Location location){
loc = location;
latitude = loc.getLatitude();
longitude = loc.getLongitude();
System.out.println("Latitude: " + latitude);
System.out.println("Longitude: " + longitude);
}
};
MyLocation myLocation = new MyLocation();
myLocation.getLocation(DataEntry.this, locationResult);
txtBuildingName=(EditText)this.findViewById(R.id.nameContent);
txtDescription=(EditText)this.findViewById(R.id.descriptionContent);
project=(Spinner)findViewById(R.id.type_project);
ArrayAdapter<CharSequence> adapterTwo = ArrayAdapter.createFromResource(this, R.array.type_project_array, android.R.layout.simple_spinner_item);
project.setAdapter(adapterTwo);
txtLatitude=(TextView)this.findViewById(R.id.TextViewLat);
txtLongitude=(TextView)this.findViewById(R.id.TextViewLong);
/*These checks will ensure that if a variable still has user data in it, it will refill the fields with that data preventing users entering
* the same information multiple times
*/
if(name != null){
txtBuildingName.setText(name);
}
if(description != null){
txtDescription.setText(description);
}
if(projectString != null){
project.getItemAtPosition(project.getSelectedItemPosition()).toString();
}
if(latString != null){
txtLatitude.setText(latString);
}
if(lngString != null){
txtLongitude.setText(lngString);
}
btnClear=(Button)findViewById(R.id.btnClear);
btnClear.setOnClickListener(this);
btnSync=(Button)findViewById(R.id.btnSync);
btnSync.setOnClickListener(new OnClickListener(){
public void onClick(View v){ //NEW VERSION OF COMMIT DATA - WILL PRESERVE DATA OVER ACTIVITY
if(txtBuildingName.getText().toString().length() > 0)
name = txtBuildingName.getText().toString();
if(txtDescription.getText().toString().length() > 0)
description = txtDescription.getText().toString();
if(project.getItemAtPosition(project.getSelectedItemPosition()).toString().length() > 0)
projectString = project.getItemAtPosition(project.getSelectedItemPosition()).toString();
Intent intent = new Intent(DataEntry.this, DataSummary.class);
startActivity(intent);
}
});
}
public static String getName(){
return name;
}
public static String getDescription(){
return description;
}
public static String getLongitude(){
return lngString;
}
public static String getLatitude(){
return latString;
}
/*public Location getLongitude(){
LocationManager lm = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
Location location = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
longitude = location.getLongitude();
return longitude;
}
public Location getLatitude(){
LocationManager lm = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
Location location = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
latitude = location.getLatitude();
latitudeString = String.valueOf(latitude);
return latitudeString;
}*/
public static String getProject(){
return projectString;
}
public void onSaveInstanceState(Bundle outState){
super.onSaveInstanceState(outState);
}
public void onRestoredInstanceState(Bundle returnState)
{
super.onRestoreInstanceState(returnState);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_favourite_building, menu);
return true;
}
public void onClick(View v){
switch(v.getId())
{
case R.id.btnClear : clearFields();
break;
}
}
/**
* Switch statement governing the different options available on the Action Bar
*/
public boolean onOptionsItemSelected(MenuItem item){
switch(item.getItemId()){
case R.id.app_camera:
Intent intentZero = new Intent(this, CameraDemo.class);
intentZero.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intentZero);
return true;
case R.id.app_dataentry:
Intent intent = new Intent(this, DataEntry.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
return true;
case R.id.app_syncorsave:
Intent intentOne = new Intent(this, DataSummary.class);
intentOne.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intentOne);
return true;
case R.id.app_discard:
Intent intentTwo = new Intent(this, DeleteProjects.class);
intentTwo.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intentTwo);
return true;
case R.id.app_homescreen:
Intent intentThree = new Intent(this, ProjectGrid.class);
intentThree.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intentThree);
return true;
default:
return super.onOptionsItemSelected(item);
}
}
public void clearFields(){
Toast.makeText(DataEntry.this, "All fields Reset", Toast.LENGTH_LONG).show();
txtBuildingName.getEditableText().clear();
txtDescription.getEditableText().clear();
name = ""; //must also set the static variables to blank otherwise previous data still assigned in variable.
description = "";
projectString = "";
}
}
这是MyLocation.java类： -
package application.prototype.mfb;
import java.util.Timer;
import java.util.TimerTask;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
public class MyLocation {
Timer timer1;
LocationManager lm;
LocationResult locationResult;
boolean gps_enabled=false;
boolean network_enabled=false;
public boolean getLocation(Context context, LocationResult result)
{
//I use LocationResult callback class to pass location value from MyLocation to user code.
locationResult=result;
if(lm==null)
lm = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
//exceptions will be thrown if provider is not permitted.
try
{
gps_enabled=lm.isProviderEnabled(LocationManager.GPS_PROVIDER);
}
catch(Exception ex)
{
ex.printStackTrace();
}
try
{
network_enabled=lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
}
catch(Exception ex)
{
ex.printStackTrace();
}
//don't start listeners if no provider is enabled
if(!gps_enabled && !network_enabled)
return false;
if(gps_enabled)
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListenerGps);
if(network_enabled)
lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListenerNetwork);
timer1=new Timer();
timer1.schedule(new GetLastLocation(), 20000);
return true;
}
LocationListener locationListenerGps = new LocationListener()
{
public void onLocationChanged(Location location)
{
timer1.cancel();
locationResult.gotLocation(location);
// lm.removeUpdates(this);
//lm.removeUpdates(locationListenerNetwork);
}
public void onProviderDisabled(String provider) {}
public void onProviderEnabled(String provider) {}
public void onStatusChanged(String provider, int status, Bundle extras) {}
};
LocationListener locationListenerNetwork = new LocationListener()
{
public void onLocationChanged(Location location)
{
timer1.cancel();
locationResult.gotLocation(location);
// lm.removeUpdates(this);
// lm.removeUpdates(locationListenerGps);
}
public void onProviderDisabled(String provider) {}
public void onProviderEnabled(String provider) {}
public void onStatusChanged(String provider, int status, Bundle extras) {}
};
class GetLastLocation extends TimerTask
{
@Override
public void run() {
//lm.removeUpdates(locationListenerGps);
//lm.removeUpdates(locationListenerNetwork);
Location net_loc=null, gps_loc=null;
if(gps_enabled)
gps_loc=lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if(network_enabled)
net_loc=lm.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
//if there are both values use the latest one
if(gps_loc!=null && net_loc!=null){
if(gps_loc.getTime()>net_loc.getTime())
locationResult.gotLocation(gps_loc);
else
locationResult.gotLocation(net_loc);
return;
}
if(gps_loc!=null){
locationResult.gotLocation(gps_loc);
return;
}
if(net_loc!=null){
locationResult.gotLocation(net_loc);
return;
}
locationResult.gotLocation(null);
}
}
public static abstract class LocationResult
{
public abstract void gotLocation(Location location);
}
}
现在我添加了System.out.println方法，以便在logcat日志中识别是否找到了位置值并且它们具有（见下文）。那么如何获取这些值并将它们转换为合适的格式以在TextView中显示？
01-11 18:04:01.885: I/System.out(541): Latitude: -4.066498333333333
01-11 18:04:01.885: I/System.out(541): Longitude: 52.410999999999994
*作为生成的logcat文件中的exert。
答案 0 :(得分：3)
那么我如何获取这些值并将它们转换为合适的格式以在TextView中显示？
显示它们很简单，你完成了98％的工作，只需添加：
LocationResult locationResult = new LocationResult(){
@Override
public void gotLocation(Location location){
loc = location;
latitude = loc.getLatitude();
longitude = loc.getLongitude();
txtLatitude.setText(latitude + "");
txtLongitude.setText(longitude + "");
System.out.println("Latitude: " + latitude);
System.out.println("Longitude: " + longitude);
}
};
但“合适的格式”有点模糊......你想要什么格式？您可以使用Location.convert()来使用更传统的hour:minute:second.fraction格式。
答案 1 :(得分：1)
TextView tvLongitude=(TextView)findViewById(R.id.textViewlongitude);
TextView tvLatitude=(TextView)findViewById(R.id.textViewlatitude);
tvLongitude.setText("Longitude is"+longitude );
tvLatitude.setText("Latitude is"+latitude );
通过这种方式，您可以在textview上设置值
答案 2 :(得分：0)
嗯，快速观察你的代码，你在System.out中打印你在Result回调中收到的double值，但你永远不会填充你试图放在TextViews上的两个String变量。
您应该在位置回调
上重新填充您的变量 LocationResult locationResult = new LocationResult(){
@Override
public void gotLocation(Location location){
loc = location;
latitude = loc.getLatitude();
longitude = loc.getLongitude();
lngString = String.valueOf(longitude);
latString = String.valueOf(latitude);
System.out.println("Latitude: " + latitude);
System.out.println("Longitude: " + longitude);
}
};
答案 3 :(得分：0)
要在textview上显示
您的布局activity_data_entry.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/LinearLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/textViewlatitude"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<TextView
android:id="@+id/textViewlongitude"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
内幕代码：
LocationResult locationResult = new LocationResult(){
@Override
public void gotLocation(Location location){
loc = location;
latitude = loc.getLatitude();
longitude = loc.getLongitude();
TextView tvLongitude=(TextView)findViewById(R.id.textViewlongitude);
TextView tvLatitude=(TextView)findViewById(R.id.textViewlatitude);
tvLongitude.setText("Longitude is"+longitude );
tvLatitude.setText("Latitude is"+latitude );
}
};
但是你的意思是合适的格式？