本文介绍了如果目标是固定的，那么当用户走路时，我会实时计算地图中2点之间的距离的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我试图在用户走路时在两个坐标之间实时计算距离。我正在使用一个挂起我的应用程序的while循环。我不知道如何纠正它。任何人都可以提出替代方案。 package com.ankur.mapdemo;
导入android.app.Activity;导入android.app.Activity;
导入android.app.NotificationManager;
导入android.content.Context;
导入android.location.Location;
导入android.location.LocationListener;
导入android.location.LocationManager;
导入android.media.RingtoneManager;
导入android.net.Uri;
导入android.os.Bundle;
public class AlertReminder extends Activity实现OnCheckedChangeListener，LocationListener {
CheckBox cb1，cb2，cb3，cb4，cb5，cb6，cb7;
TextView tv1，tv2;
double currentlatitude = 0，currentlongitude = 0;
float dis = 0;
位置mostrecent = new Location（）;
LocationManager locationManager;
LocationListener locationListener;
上下文上下文;
保护无效onCreate（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）;
setContentView（R.layout.alertreminder）;
locationManager =（LocationManager）getSystemService（Context.LOCATION_SERVICE）;
$ * b $ b LocationListener locationListener = new LocationListener（）{
public void onLocationChanged（Location location）{
//当网络发现新位置时调用位置提供商。
makeUseOfNewLocation（location）;
$ b $ public void onStatusChanged（String provider，int status，Bundle extras）{}
$ b $ public void onProviderEnabled（String provider）{}
public void onProviderDisabled（String provider）{}
};
$ /
//使用位置管理器注册侦听器以接收位置更新
locationManager.requestLocationUpdates（LocationManager.GPS_PROVIDER，1，1，this）;
tv2 =（TextView）findViewById（R.id.location1）;
tv1 =（TextView）findViewById（R.id.currentlocation）;
cb1 =（CheckBox）findViewById（R.id.sjt）;
cb1.setOnCheckedChangeListener（this）;
cb2 =（CheckBox）findViewById（R.id.tt）;
cb2.setOnCheckedChangeListener（this）;
cb3 =（CheckBox）findViewById（R.id.smv）;
cb3.setOnCheckedChangeListener（this）;
cb4 =（CheckBox）findViewById（R.id.mb）;
cb4.setOnCheckedChangeListener（this）;
cb5 =（CheckBox）findViewById（R.id.gdn）;
cb5.setOnCheckedChangeListener（this）;
cb6 =（CheckBox）findViewById（R.id.cdmm）;
cb6.setOnCheckedChangeListener（this）;
cb7 =（CheckBox）findViewById（R.id.allmart）;
cb7.setOnCheckedChangeListener（this）;
}
@覆盖
public void onLocationChanged（位置位置）{
// TODO自动生成的方法存根
currentlatitude = location.getLatitude（）;
currentlongitude = location.getLongitude（）;
使用新位置（位置）;
// newlocation（location）;
tv1.setText（Latitude：+ location.getLatitude（）+，Longitude：+ location.getLongitude（）+，Distance：+ dis）;
}
private void makeuseofnewlocation（Location location1）{
// TODO自动生成的方法存根
mostrecent = location1;
// currentlatitude = location.getLatitude（）;
// currentlongitude = location.getLongitude（）;
$ b @Override
public void onProviderDisabled（String provider）{
// TODO自动生成的方法存根
Log.d（Latitude，disable）;
}
@Override
public void onProviderEnabled（String provider）{
// TODO自动生成的方法存根
Log.d（Latitude ， 使能）;
$ b @Override
public void onStatusChanged（String provider，int status，Bundle extras）{
// TODO自动生成的方法存根
Log .D（ 纬度， 状态）;
$ b @Override
public void onCheckedChanged（CompoundButton arg0，boolean arg1）{
// TODO自动生成的方法存根
int i = arg0.getId（）;如果（i == R.id.allmart）
{
if（arg1）
{
double destLat = 12.972887;
double destLong = 79.159715;
Location me = new Location（）;
位置dest =新位置（）;
me.setLatitude（currentlatitude）;
me.setLongitude（currentlongitude）;
dest.setLatitude（destLat）;
dest.setLongitude（destLong）;
float dist = me.distanceTo（dest）;
while（dist> 50）
{
makeuseofnewlocation（mostrecent）;
// cbskjcbkcb
// cbshbcbcbhchj
// currentlatitude = l1.getLatitude（）;
// currentlongitude = l1.getLongitude（）;
me.setLatitude（mostrecent.getLatitude（））;
me.setLongitude（mostrecent.getLongitude（））;
dest.setLatitude（destLat）;
dest.setLongitude（destLong）;
dist = me.distanceTo（dest）;
dis = dist; （dist {
NotificationManager notificationManager =（NotificationManager）上下文中的
$ b。 getSystemService（Context.NOTIFICATION_SERVICE）;
Uri soundUri = RingtoneManager.getDefaultUri（RingtoneManager.TYPE_NOTIFICATION）;
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder（getApplicationContext（））
.setSmallIcon（R.drawable.notify）
.setContentTitle（ALERT）
.setContentText（这是通知）
.setSound（soundUri）;
notificationManager.notify（0，mBuilder.build（））;
}
}
}
}
}
`
解决方案
只要距离大于50，它将保持在循环内，但不会更新布局中的任何内容。我会为这个计算创建一个新的线程（谷歌多线程），并让你的主线程只获得这些值，并在你的布局更新。
I m trying to calculate distance in real time between 2 co-ordinates as the user walks. I am using a while loop which hangs my application. I have no idea how to rectify it. Can anyone suggest a alternative to it.
package com.ankur.mapdemo;
import android.app.Activity;import android.app.Activity;
import android.app.NotificationManager;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.media.RingtoneManager;
import android.net.Uri;
import android.os.Bundle;
public class AlertReminder extends Activity implements OnCheckedChangeListener,LocationListener {
CheckBox cb1,cb2,cb3,cb4,cb5,cb6,cb7;
TextView tv1,tv2;
double currentlatitude=0,currentlongitude=0;
float dis = 0;
Location mostrecent = new Location("");
LocationManager locationManager;
LocationListener locationListener;
Context context;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.alertreminder);
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
/*
LocationListener locationListener = new LocationListener() {
public void onLocationChanged(Location location) {
// Called when a new location is found by the network location provider.
makeUseOfNewLocation(location);
}
public void onStatusChanged(String provider, int status, Bundle extras) {}
public void onProviderEnabled(String provider) {}
public void onProviderDisabled(String provider) {}
};
*/
// Register the listener with the Location Manager to receive location updates
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1, 1, this);
tv2= (TextView)findViewById(R.id.location1);
tv1 = (TextView)findViewById(R.id.currentlocation);
cb1 = (CheckBox)findViewById(R.id.sjt);
cb1.setOnCheckedChangeListener(this);
cb2 = (CheckBox)findViewById(R.id.tt);
cb2.setOnCheckedChangeListener(this);
cb3 = (CheckBox)findViewById(R.id.smv);
cb3.setOnCheckedChangeListener(this);
cb4 = (CheckBox)findViewById(R.id.mb);
cb4.setOnCheckedChangeListener(this);
cb5 = (CheckBox)findViewById(R.id.gdn);
cb5.setOnCheckedChangeListener(this);
cb6 = (CheckBox)findViewById(R.id.cdmm);
cb6.setOnCheckedChangeListener(this);
cb7 = (CheckBox)findViewById(R.id.allmart);
cb7.setOnCheckedChangeListener(this);
}
@Override
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
currentlatitude = location.getLatitude();
currentlongitude = location.getLongitude();
makeuseofnewlocation(location);
//newlocation(location);
tv1.setText("Latitude:" + location.getLatitude() + ", Longitude:" + location.getLongitude() + ", Distance:" + dis);
}
private void makeuseofnewlocation(Location location1) {
// TODO Auto-generated method stub
mostrecent = location1;
//currentlatitude = location.getLatitude();
//currentlongitude = location.getLongitude();
}
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
Log.d("Latitude","disable");
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
Log.d("Latitude","enable");
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
Log.d("Latitude","status");
}
@Override
public void onCheckedChanged(CompoundButton arg0, boolean arg1) {
// TODO Auto-generated method stub
int i = arg0.getId();
if(i == R.id.allmart)
{
if(arg1)
{
double destLat = 12.972887;
double destLong = 79.159715;
Location me = new Location("");
Location dest = new Location("");
me.setLatitude(currentlatitude);
me.setLongitude(currentlongitude);
dest.setLatitude(destLat);
dest.setLongitude(destLong);
float dist = me.distanceTo(dest);
while(dist > 50)
{
makeuseofnewlocation(mostrecent);
//cbskjcbkcb
//cbshbcbcbhchj
//currentlatitude = l1.getLatitude();
//currentlongitude = l1.getLongitude();
me.setLatitude(mostrecent.getLatitude());
me.setLongitude(mostrecent.getLongitude());
dest.setLatitude(destLat);
dest.setLongitude(destLong);
dist = me.distanceTo(dest);
dis = dist;
}
if(dist <= 50)
{
NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
Uri soundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(getApplicationContext())
.setSmallIcon(R.drawable.notify)
.setContentTitle("ALERT")
.setContentText("this is a notification")
.setSound(soundUri);
notificationManager.notify(0, mBuilder.build());
}
}
}
}
}`
解决方案
As long as the distance is greater than 50, it will stay inside the loop, but won't update anything in your layout. I would create a new thread for this calculation (google multithreading), and let your main thread only get those values and update them in your layout.
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