警告对话框的主题 - 机器人 [英] Alert Dialog from Thread - Android
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问题描述
我有发送GPS坐标，以每六秒钟数据库的螺纹和我有一个检查，验证该用户是一个定义的区域内。如果用户不在位置中，我想，通知他们，他们是超出范围的警告对话框，如果他们是在区域内我想一个对话框，告诉他们，他们都在范围之内。我有检查工作正常，但我已尽力，我pretty的肯定，我不能在后台线程中添加对话框。我读了一些关于使用处理程序，但我不知道如何实现的。如果您有任何建议，我会AP preciate吧！谢谢你。
这是我怎么叫 FindLocation.java 从我的主要活动（ MainActivity.java ）：
新FindLocation（getBaseContext（））启动（usr_id1）。 //将用户ID与它
下面是 FindLocation.java
公共类FindLocation继承Thread {
公共布尔inJurisdiction;
公共布尔AlertNotice = FALSE;
私人LocationManager locManager;
私人LocationListener的locListener;
上下文CTX;
公共字符串userid;
公共FindLocation（上下文CTX）{
this.ctx = CTX;
}
公共无效启动（字符串userid）{
this.userId =用户id;
super.start（）;
}
@覆盖
公共无效的run（）{
活套prepare（）。
最后弦乐USR =用户id;
//获取一个引用LocationManager
locManager =（LocationManager）ctx.getSystemService（Context.LOCATION_SERVICE）;
//检查，以从位置接收更新
locListener =新LocationListener的（）{
公共无效onLocationChanged（位置LOC）{
串纬度=将String.valueOf（loc.getLatitude（））;
串经度=将String.valueOf（loc.getLongitude（））;
双纬度= loc.getLatitude（）;
双经度= loc.getLongitude（）;
如果（北纬＆GT; = 39.15296＆功放;＆安培;经度＆GT; = -86.547546＆功放;＆安培;纬度和LT = 39.184901和放大器;＆安培;经度＆LT;！= -86.504288 || inArea = FALSE）{
Log.i（测试，是）;
inArea = TRUE;
JSONArray jArray;
字符串结果= NULL;
InputStream的是= NULL;
StringBuilder的SB = NULL;
ArrayList的＆LT;的NameValuePair＆GT; namevaluepairs中=新的ArrayList＆LT;的NameValuePair＆GT;（）;
nameValuePairs.add（新BasicNameValuePair（ID，USR））;
// HTTP POST
尝试{
HttpClient的HttpClient的=新DefaultHttpClient（）;
HttpPost httppost =新HttpPost（http://www.example.com/test/example.php）;
httppost.setEntity（新UrlEn codedFormEntity（namevaluepairs中））;
HTT presponse响应= httpclient.execute（httppost）;
HttpEntity实体= response.getEntity（）;
是= entity.getContent（）;
}赶上（例外五）{
Log.e（log_tag，错误的HTTP连接+ e.toString（））;
}
//转换响应串
尝试{
的BufferedReader读卡器=新的BufferedReader（新InputStreamReader的（就是，ISO-8859-1），8）;
SB =新的StringBuilder（）;
sb.append（reader.readLine（）+\ N）;
串行=0;
而（（行= reader.readLine（））！= NULL）{
sb.append（行+\ N）;
}
is.close（）;
结果= sb.toString（）;
}
赶上（例外五）{
Log.e（log_tag，错误转换结果+ e.toString（））;
}
尝试{
jArray =新JSONArray（结果）;
JSONObject的json_data = NULL;
的for（int i = 0; I＆LT; jArray.length（）;我++）{
json_data = jArray.getJSONObject（ⅰ）;
串ct_name = json_data.getString（phoneID）;
Log.i（用户ID，ct_name）;
如果（ct_name == USR）{
locManager.removeUpdates（locListener）;
}
其他{
locManager.removeUpdates（locListener）;
Log.i（用户ID，无）;
}
}
}
赶上（例外五）{
//Log.e("log_tag，错误将导致+ e.toString（））;
HttpClient的HttpClient的=新DefaultHttpClient（）;
HttpPost httppost =新HttpPost（http://example.com/test/example.php）;
尝试 {
名单＆LT;的NameValuePair＆GT; nameValuePairs1 =新的ArrayList＆LT;的NameValuePair＆GT;（2）;
nameValuePairs1.add（新BasicNameValuePair（土地增值税，LAT））;
nameValuePairs1.add（新BasicNameValuePair（LON，LON））;
nameValuePairs1.add（新BasicNameValuePair（ID，USR））;
httppost.setEntity（新UrlEn codedFormEntity（nameValuePairs1））;
httpclient.execute（httppost）;
Log.i（SendLocation，是）;
}
赶上（ClientProtocolException G）{
// TODO自动生成的catch块
}赶上（IOException异常F）{
// TODO自动生成的catch块
e.printStackTrace（）;
}
}
}
其他 {
Log.i（测试，否）;
inArea = FALSE;
}
}
公共无效onProviderDisabled（字符串提供商）{
}
公共无效onProviderEnabled（字符串提供商）{
}
公共无效onStatusChanged（字符串商，INT地位，捆绑演员）{
}
};
locManager.requestLocationUpdates（LocationManager.GPS_PROVIDER，6000，0，locListener）;
Looper.loop（）;
}
}
解决方案
这是一个有点难以阅读整个code，但我会告诉你如何显示 AlertDialog 从后台发：
创建内部处理程序的onCreate（）或 onResume（） ...这上运行东西 UI线程：
...的onCreate（）{
... mHandler =新的处理程序（）;
}
那么你的发内（）只需使用：
mHandler.post（新的Runnable {
公共无效的run（）{
//一定要通过你的活动类，而不是线程
AlertDialog.Builder建设者=新AlertDialog.Builder（MyActivity.this）;
// ...设置对话框并显示
}
}）;
I have a thread that sends GPS coordinates to a database every six seconds and I have a check that verifies that the user is within a defined area. If the user is not within the location, I want an alert dialog that notifies them that they are out of range, and if they are within the area I want a dialog that tells them they are within range. I have the checks working properly, but I have tried and I'm pretty sure that I can't add the dialog on the background thread. I have read a bit about using handlers but I'm not sure how to implement one. If you have any suggestions I would appreciate it! Thanks.
This is how I call FindLocation.java from my main activity (MainActivity.java):
new FindLocation(getBaseContext()).start(usr_id1); //sends a user id with it
Below is FindLocation.java
public class FindLocation extends Thread {
public boolean inJurisdiction;
public boolean AlertNotice = false;
private LocationManager locManager;
private LocationListener locListener;
Context ctx;
public String userId;
public FindLocation(Context ctx) {
this.ctx = ctx;
}
public void start(String userId) {
this.userId = userId;
super.start();
}
@Override
public void run() {
Looper.prepare();
final String usr = userId;
//get a reference to the LocationManager
locManager = (LocationManager) ctx.getSystemService(Context.LOCATION_SERVICE);
//checked to receive updates from the position
locListener = new LocationListener() {
public void onLocationChanged(Location loc) {
String lat = String.valueOf(loc.getLatitude());
String lon = String.valueOf(loc.getLongitude());
Double latitude = loc.getLatitude();
Double longitude = loc.getLongitude();
if (latitude >= 39.15296 && longitude >= -86.547546 && latitude <= 39.184901 && longitude <= -86.504288 || inArea != false) {
Log.i("Test", "Yes");
inArea = true;
JSONArray jArray;
String result = null;
InputStream is = null;
StringBuilder sb = null;
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("id", usr));
//http post
try{
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://www.example.com/test/example.php");
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
}catch(Exception e){
Log.e("log_tag", "Error in http connection"+e.toString());
}
//convert response to string
try{
BufferedReader reader = new BufferedReader(new InputStreamReader(is,"iso-8859-1"),8);
sb = new StringBuilder();
sb.append(reader.readLine() + "\n");
String line="0";
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
result=sb.toString();
}
catch(Exception e){
Log.e("log_tag", "Error converting result "+e.toString());
}
try{
jArray = new JSONArray(result);
JSONObject json_data=null;
for(int i=0;i<jArray.length();i++){
json_data = jArray.getJSONObject(i);
String ct_name = json_data.getString("phoneID");
Log.i("User ID", ct_name);
if(ct_name == usr) {
locManager.removeUpdates(locListener);
}
else{
locManager.removeUpdates(locListener);
Log.i("User ID", "NONE");
}
}
}
catch(Exception e){
//Log.e("log_tag", "Error converting result "+e.toString());
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://example.com/test/example.php");
try {
List<NameValuePair> nameValuePairs1 = new ArrayList<NameValuePair>(2);
nameValuePairs1.add(new BasicNameValuePair("lat", lat));
nameValuePairs1.add(new BasicNameValuePair("lon", lon));
nameValuePairs1.add(new BasicNameValuePair("id", usr));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs1));
httpclient.execute(httppost);
Log.i("SendLocation", "Yes");
}
catch (ClientProtocolException g) {
// TODO Auto-generated catch block
} catch (IOException f) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
else {
Log.i("Test", "No");
inArea = false;
}
}
public void onProviderDisabled(String provider){
}
public void onProviderEnabled(String provider){
}
public void onStatusChanged(String provider, int status, Bundle extras){
}
};
locManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 6000, 0, locListener);
Looper.loop();
}
}
解决方案
It is a little difficult to read the entire code, but I will show you how to display an AlertDialog from a background Thread:
Create a handler inside onCreate(), or onResume()... something that runs on the UI-Thread :
...onCreate(){
...mHandler=new Handler();
}
Then inside your Thread() just use :
mHandler.post(new Runnable{
public void run(){
//Be sure to pass your Activity class, not the Thread
AlertDialog.Builder builder = new AlertDialog.Builder(MyActivity.this);
//... setup dialog and show
}
});
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