AutoCompleteTextView location, destination;
public Places place1, place2;
Button calculate;
TextView result_a, result_b;
String result_main;
//default values for taxi fare
int basePrice = 10;
double priceMeter = 5.80;
double fare;
int parseFare;
int roundedValue;
String textvalue;
String actual_distance;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
location=(AutoCompleteTextView)findViewById(R.id.locale);
location.setAdapter(new PlacesAutoCompleteAdapter(this, R.layout.list_item));
location.setOnItemClickListener(new OnItemClickListener()
{
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) {
// TODO Auto-generated method stub
place1 = (Places) adapterView.getItemAtPosition(position);
location.setText(place1.description);
//location.clearFocus();
Log.d("AutoCompleteTask", location.getText().toString());
}
});
destination = (AutoCompleteTextView)findViewById(R.id.destination);
destination.setAdapter(new PlacesAutoCompleteAdapter(this, R.layout.list_item));
destination.setOnItemClickListener(new OnItemClickListener()
{
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) {
// TODO Auto-generated method stub
place2 = (Places) adapterView.getItemAtPosition(position);
destination.setText(place2.description);
//destination.clearFocus();
Log.d("AutoCompleteTask2", destination.getText().toString());
}
});
calculate = (Button)findViewById(R.id.calculate);
calculate.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
new ReadDistanceJSONFeedTask().execute("http://maps.googleapis.com/maps/api/distancematrix/json?origins="+location.getText().toString()+"&destinations="+destination.getText().toString()+"&sensor=false&units=metric&mode=driving");
//result_a.setText("ROUTE A "+result_main +"\n"+ "The estimated fare is Rs."+textvalue);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
private class ReadDistanceJSONFeedTask extends AsyncTask<String, Void, String>
{
@Override
protected String doInBackground(String... urls) {
// TODO Auto-generated method stub
return readJSONFeed(urls[0]);
}
@Override
protected void onPostExecute(String result)
{
try
{ //Accessing the JSON Results
JSONObject jsonObject = new JSONObject(result);
JSONArray rows = jsonObject.getJSONArray("rows");
Log.i("json", rows.toString());
JSONObject obj = rows.getJSONObject(0);
JSONArray elements = obj.getJSONArray("elements");
JSONObject ini_dis = elements.getJSONObject(0);
JSONObject distance = ini_dis.getJSONObject("distance");
Log.i("json", distance.toString());
//Distance to send
actual_distance = distance.getString("text");
//Calculation part
String solve = distance.getString("value");
int parseFare = Integer.parseInt(solve);
fare = basePrice + ((parseFare/200)*priceMeter);
roundedValue = (int)Math.round(fare);
//another activity
Intent i = new Intent(MainActivity.this,ResultsDisplay.class);
i.putExtra("Display",actual_distance);
i.putExtra("Display_b",textvalue);
startActivity(i);
}
catch(Exception e)
{
Log.d("ReadDistanceJSONFeedTask", e.getLocalizedMessage());
}
}
public String readJSONFeed(String URL){
//Initial steps to getting the JSON Result
StringBuilder stringBuilder = new StringBuilder();
HttpClient httpClient = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(URL);
try
{
HttpResponse response = httpClient.execute(httpGet);
StatusLine statusLine = response.getStatusLine();
int statusCode = statusLine.getStatusCode();
//statusCodes at 200 are OK_Statuses
if(statusCode==200)
{
HttpEntity entity = response.getEntity();
InputStream inputStream = entity.getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
String line;
while((line=reader.readLine())!=null)
{
stringBuilder.append(line);
}
inputStream.close();
}
else
{
Log.d("readJSONFeed","Failed to download file");
}
}
catch(Exception e)
{
Log.d("readJSONFeed", e.getLocalizedMessage());
}
return stringBuilder.toString();
}
}
我正在创建一个应用程序,用于输入位置和目标,并返回路径之间的距离以及估计的出租车费用。此程序中还包含一个自动完成的文本视图功能,该功能使用Google-Places
API。
此应用程序使用Direction-Matrix-API
我当前在AsyncTask
上遇到问题... logcat在'doInBackGround()'方法中生成错误...请帮助。< / p>
LogCat错误
03-27 09:29:03.785:I / Choreographer(3468):跳过123帧!该 应用程序可能在其主线程上做了太多工作。 03-27 09:29:05.485:W / dalvikvm(3468):threadid = 12:线程退出 未捕获的异常(组= 0x40a71930)03-27 09:29:05.525: E / AndroidRuntime(3468):致命异常:AsyncTask#2 03-27 09:29:05.525:E / AndroidRuntime(3468):java.lang.RuntimeException:An 执行doInBackground时发生错误()03-27 09:29:05.525: E / AndroidRuntime(3468):at android.os.AsyncTask $ 3.done(AsyncTask.java:299)03-27 09:29:05.525: E / AndroidRuntime(3468):at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352) 03-27 09:29:05.525:E / AndroidRuntime(3468):at java.util.concurrent.FutureTask.setException(FutureTask.java:219) 03-27 09:29:05.525:E / AndroidRuntime(3468):at java.util.concurrent.FutureTask.run(FutureTask.java:239)03-27 09:29:05.525:E / AndroidRuntime(3468):at android.os.AsyncTask $ SerialExecutor $ 1.run(AsyncTask.java:230)03-27 09:29:05.525:E / AndroidRuntime(3468):at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080) 03-27 09:29:05.525:E / AndroidRuntime(3468):at java.util.concurrent.ThreadPoolExecutor中的$ Worker.run(ThreadPoolExecutor.java:573) 03-27 09:29:05.525:E / AndroidRuntime(3468):at java.lang.Thread.run(Thread.java:856)03-27 09:29:05.525: E / AndroidRuntime(3468):引起:java.lang.IllegalArgumentException: 索引73处查询中的非法字符: http://maps.googleapis.com/maps/api/distancematrix/json?origins=Lagankhel Rd,帕坦,中部地区,尼泊尔和目的地= Thamel,加德满都, 中部地区,尼泊尔&amp; sensor = false&amp; units = metric&amp; mode =驾驶03-27 09:29:05.525:E / AndroidRuntime(3468):at java.net.URI.create(URI.java:727)03-27 09:29:05.525: E / AndroidRuntime(3468):at org.apache.http.client.methods.HttpGet。(HttpGet.java:75)03-27 09:29:05.525:E / AndroidRuntime(3468):at com.example.calculator_taxi_fare.MainActivity $ ReadDistanceJSONFeedTask.readJSONFeed(MainActivity.java:159) 03-27 09:29:05.525:E / AndroidRuntime(3468):at com.example.calculator_taxi_fare.MainActivity $ ReadDistanceJSONFeedTask.doInBackground(MainActivity.java:111) 03-27 09:29:05.525:E / AndroidRuntime(3468):at com.example.calculator_taxi_fare.MainActivity $ ReadDistanceJSONFeedTask.doInBackground(MainActivity.java:1) 03-27 09:29:05.525:E / AndroidRuntime(3468):at android.os.AsyncTask $ 2.call(AsyncTask.java:287)03-27 09:29:05.525: E / AndroidRuntime(3468):at java.util.concurrent.FutureTask.run(FutureTask.java:234)03-27 09:29:05.525:E / AndroidRuntime(3468):... 4更多
答案 0 :(得分:1)
在这里
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
new ReadDistanceJSONFeedTask().execute("your url");
....
startActivity(i); //<<<<<
}
在执行ReadDistanceJSONFeedTask
AsyncTask之后,您正在启动下一个Activity。因为AsyncTask在单独的Thread中执行并且控制到达下一行而不等待AsyncTask结果。
移动onPostExecute
内的活动开始部分,在doInBackground
执行完成后,在UI线程上执行:
@Override
protected void onPostExecute(String result)
{
///....your code here..
// start next Activity here..
Intent i = new Intent(MainActivity.this,ResultsDisplay.class);
i.putExtra("Display",actual_distance);
i.putExtra("Display_b",textvalue);
startActivity(i);
}
编辑: 在为HttpGet
发送参数之前,您还需要使用URLEncoder.encode
String strparams="origins="+location.getText().toString()+"&
destinations="+destination.getText().toString()+
"&sensor=false&units=metric&mode=driving";
String encodedurl = URLEncoder.encode(strparams,"UTF-8");
new ReadDistanceJSONFeedTask().execute("http://maps.googleapis.com/maps
/api/distancematrix/json?"+encodedurl);