反复调用onDistance（）函数 [英] Repeatedly Call onDistance() function
本文介绍了反复调用onDistance（）函数的处理方法，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
嗨伙计们，
我有一个简单的问题，我开发了一个应用程序，可以将坐标从一个设备（客户端A）传输到另一个设备（客户端B）并且获取两者之间的距离，我使用distanceTo（）来获取距离，这是在客户端B上计算的。但是这只在客户端B中的onLocationChanged中调用，并且想法是客户端A将漫游并且客户B几乎是静止的。所以检查客户B onLocationChanged的距离是不理想的。
有没有办法不断调用distanceTo（）方法，如果我把它放了一段时间（true）循环，它永远不会退出，下一行代码不会被执行。如果可能的话，我会很感激这里有一些我的客户B代码：
public void onCreate（Bundle） savedInstanceState）
{
super.onCreate（savedInstanceState）;
setContentView（R.layout.parent）;
submit =（Button）findViewById（R.id.buttonSubmit）;
submit.setOnClickListener（new View.OnClickListener（）{
public void onClick（View v）{
// TODO自动生成的方法stub
happiness.add（（Integer） item）;
}
}）;
ArrayAdapter< CharSequence> adapter = ArrayAdapter.createFromResource（
this，R.array.happiness，android.R.layout.simple_spinner_item）;
adapter.setDropDownViewResource（android.R.layout.simple_spinner_dropdown_item）;
spinner =（Spinner）findViewById（R.id.happy）;
spinner.setAdapter（adapter）;
spinner.setOnItemSelectedListener（this）;
LocationManager mlocationManager =（LocationManager）getSystemService（Context.LOCATION_SERVICE）;
LocationListener mlocationListener = new MyLocationListener（）;
mlocationManager.requestLocationUpdates（LocationManager.GPS_PROVIDER，
0,0，mlocationListener）;
Thread rec = new Thread（new Runnable（）{
public void run（）{
// TODO自动生成的方法stub
try {
s = new Socket （192.168.1.2，1980）; //连接到服务器
// s = new Socket（86.46.233.230，1980）;
InputStream fromServer = s.getInputStream（）;
if（！s.isConnected（））{
Toast.makeText（getApplicationContext（），
No Connection，Toast.LENGTH_LONG）。show（）;
}
while（s.isConnected（））{
Scanner r = new Scanner（fromServer）;
if（r.hasNextLine（））{
location = r.nextLine（）;
}
String [] currLocation = location.split（，）; // STRING是每个COMMA的分支
Clatitude = Double.valueOf（currLocation [0]）; //获取ARRAY的第一个元素
Clongitude = Double.valueOf（currLocation [1]）; //使用ARRAY的第二个元素
//按顺序在UI线上运行
mHandler.post（new Runnable（）{
public void run（）{
TextView myTextview1 =（TextView）findViewById（R.id.childCo）;
myTextview1.setText（location）;
}
}）;
}
} catch（UnknownHostException e）{
e.printStackTrace（）;
} catch（IOException e）{
e.printStackTrace（）;
}
}
}）;
rec.start（）;
}
// ======================================= ==============================================
public class MyLocationListener实现LocationListener {
public void onProviderDisabled（String provider）{
Toast.makeText（getApplicationContext（），Gps Disabled，
Toast.LENGTH_SHORT）.show（）;
}
public void onProviderEnabled（String provider）{
Toast.makeText（getApplicationContext（），Gps Enabled，
Toast.LENGTH_SHORT）。show（）;
}
public void onStatusChanged（String provider，int status，Bundle extras）{
}
public void onLocationChanged（Location location）{
// TODO Auto-generated方法存根
Platitude = location.getLatitude（）;
Plongitude = location.getLongitude（）;
//将父坐标添加到字符串以进行打印 - （测试）
ParentCoordinates =（Platitude +，+ Plongitude）;
TextView myTextview2 =（TextView）findViewById（R.id.parentCo）;
myTextview2.setText（ParentCoordinates）;
位置child = new位置（A点）; //初始化儿童位置
child.setLatitude（Clatitude）; //设置儿童位置LAT& LONG
child.setLongitude（Clongitude）;
位置parent = new位置（B点）; //初始化儿童位置
parent.setLatitude（Platitude）; //设置儿童位置LAT& LONG
parent.setLongitude（Plongitude）;
float distance = child.distanceTo（parent）; //从父母位置到儿童位置的距离
String dis =（+ distance）;
TextView myTextview1 =（TextView）findViewById（R.id.distTo）; //在文本视图中显示距离
myTextview1.setText（dis）;
}
// ======================================= ==============================================
}
// =========================================== ==========================================
public void onItemSelected（ AdapterView<？> parent，View view，int pos，long id）{
// TODO自动生成的方法stub
item = parent.getItemAtPosition（pos）; //从SPINNER中选择项目
}
public void onNothingSelected（AdapterView<？> arg0）{
// TODO自动生成的方法stub
}
/ / ================================================= =====================================
}
先谢谢大家!!!
解决方案
试试使用计时器控制刻度事件在连续的时间间隔内触发该功能，
设置以下属性
imer.Interval =（ 1000 ）*（ 10 ）; // 计时器将标记为10秒
timer.Enabled = 真; // 启用计时器
timer.Start（）;
Hi folks,
I''ve a quick question, I have developed an application that transmits coordinates from one device (Client A) to another (Client B) and gets the distance between both, I am using the distanceTo() to get the distance, this is calculated on Client B. However this is only called in the onLocationChanged in Client B, and the idea is that Client A will be roaming and Client B will be almost stationary. So checking the distance in Client B onLocationChanged isn''t ideal.
Is there a way to constantly call the distanceTo() method, if I put it in a while(true) loop, it will never exit and the next line of code won''t be executed. I''d appreciate a dig out on this if possible here''s some of my client B code:
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.parent);
submit = (Button) findViewById(R.id.buttonSubmit);
submit.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
happiness.add((Integer) item);
}
});
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
this, R.array.happiness, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner = (Spinner) findViewById(R.id.happy);
spinner.setAdapter(adapter);
spinner.setOnItemSelectedListener(this);
LocationManager mlocationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
LocationListener mlocationListener = new MyLocationListener();
mlocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,
0, 0, mlocationListener);
Thread rec = new Thread(new Runnable() {
public void run() {
// TODO Auto-generated method stub
try {
s = new Socket("192.168.1.2", 1980); // Connecting to Server
//s = new Socket("86.46.233.230", 1980);
InputStream fromServer = s.getInputStream();
if (!s.isConnected()) {
Toast.makeText(getApplicationContext(),
"No Connection", Toast.LENGTH_LONG).show();
}
while (s.isConnected()) {
Scanner r = new Scanner(fromServer);
if (r.hasNextLine()) {
location = r.nextLine();
}
String[] currLocation = location.split(","); // STRING IS SPLIT EACH SIDE OF COMMA
Clatitude = Double.valueOf(currLocation[0]); // TAKING FIRST ELEMENT OF ARRAY
Clongitude = Double.valueOf(currLocation[1]); // TAKING SECOND ELEMENT OF ARRAY
// IN ORDER TO RUN ON THE UI THREAD
mHandler.post(new Runnable() {
public void run() {
TextView myTextview1 = (TextView) findViewById(R.id.childCo);
myTextview1.setText(location);
}
});
}
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
});
rec.start();
}
// =====================================================================================
public class MyLocationListener implements LocationListener {
public void onProviderDisabled(String provider) {
Toast.makeText(getApplicationContext(), "Gps Disabled",
Toast.LENGTH_SHORT).show();
}
public void onProviderEnabled(String provider) {
Toast.makeText(getApplicationContext(), "Gps Enabled",
Toast.LENGTH_SHORT).show();
}
public void onStatusChanged(String provider, int status, Bundle extras) {
}
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
Platitude = location.getLatitude();
Plongitude = location.getLongitude();
//Adding parent coordinates to string for printing - (testing)
ParentCoordinates = (Platitude + " , " + Plongitude);
TextView myTextview2 = (TextView) findViewById(R.id.parentCo);
myTextview2.setText(ParentCoordinates);
Location child = new Location("point A"); //INITIALIZING CHILD LOCATION
child.setLatitude(Clatitude); //SETTING CHILD LOCATION LAT & LONG
child.setLongitude(Clongitude);
Location parent = new Location("point B"); //INITIALIZING CHILD LOCATION
parent.setLatitude(Platitude); //SETTING CHILD LOCATION LAT & LONG
parent.setLongitude(Plongitude);
float distance = child.distanceTo(parent); //GETTING DISTANCE FROM PARENT LOCATION TO CHILD LOCATION
String dis = ("" + distance);
TextView myTextview1 = (TextView) findViewById(R.id.distTo); //DISPLAYING DISTANCE IN TEXT VIEW
myTextview1.setText(dis);
}
// =====================================================================================
}
// =====================================================================================
public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
// TODO Auto-generated method stub
item = parent.getItemAtPosition(pos); //GETTING ITEM SELECTED FROM SPINNER
}
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
// ======================================================================================
}
Thanks in advance folks!!!
解决方案
Hi,
try to use timer control tick event to fire that function in continous time interval,
set following properties
imer.Interval = (1000) * (10); // Timer will tick evert 10 seconds timer.Enabled = true; // Enable the timer timer.Start();
这篇关于反复调用onDistance（）函数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！
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