无法在捕获中显示toast package com.example.m2mai； 导入java.io.BufferedReader； 导入java.io.InputStreamReader； 导入java.net.HttpURLConnection； 导入java.net.URL； 导入java.sql.Timestamp； 导入java.text.DateFormat； 导入java.text.simpleDataFormat； 导入java.util.ArrayList； 导入java.util.Date； 导入org.json.JSONArray； 导入org.json.JSONObject； 导入android.app.Activity； 导入android.os.AsyncTask； 导入android.os.Bundle； 导入android.view.view； 导入android.widget.ArrayAdapter； 导入android.widget.EditText； 导入android.widget.ListView； 导入android.widget.Toast； 公共类检索活动扩展了活动{ @凌驾 创建时受保护的void（Bundle savedInstanceState） { super.onCreate（savedInstanceState）； setContentView（R.layout.activity_retrieve）； } 公共void getStream（视图v） { 新建MyAsyncTask（）.execute（）； } 私有类MyAsyncTask扩展了AsyncTask { ArrayList mNameList=新的ArrayList（）； public ArrayList atList=new ArrayList（）； public ArrayList dataList=new ArrayList（）； 受保护的字符串doInBackground（字符串…参数） { 返回getData（）； } 公共长getDateTo（） { EditText-toText=（EditText）findViewById（R.id.dateTo）； 字符串To=toText.getText（）.toString（）； DateFormat DateFormato=新的SimpleDateFormat（“dd/MM/yyyy”）； dateTo=null； 试一试{ dateTo=dateformato.parse（To）； }catch（java.text.parsee）{ .runOnUiThread（新的Runnable（）{ 公开募捐{ Toast.makeText（getApplicationContext（），“请输入正确的输入”，Toast.LENGTH\u LONG.show（）； } }); e、 printStackTrace（）； } long-timeTo=dateTo.getTime（）； 新时间戳（timeTo）； 返回时间为/1000； } 受保护的字符串getData（） { 字符串toTS=“”+getDateTo（）； 字符串decodedString=“”； 字符串returnMsg=“”； 字符串请求=”http://api.carriots.com/devices/defaultDevice@eric3231559.eric3231559/streams/？order=-1&max=10&at_to=“+toTS； 网址； HttpURLConnection=null； 试一试{ url=新url（请求）； connection=（HttpURLConnection）url.openConnection（）； connection.addRequestProperty（“carriots.apikey”、“1234567”）； addRequestProperty（“内容类型”、“应用程序/json”）； connection.setRequestMethod（“GET”）； BufferedReader in=新的BufferedReader（新的InputStreamReader（connection.getInputStream（））； 而（（decodedString=in.readLine（））！=null） { returnMsg+=解码字符串； } in.close（）； 连接断开（）； JSONObject nodeRoot=新的JSONObject（returnMsg）； JSONArray res=nodeRoot.getJSONArray（“结果”）； 对于（int i=0；i

我如何在不停止的情况下展示祝酒词？每当它落入陷阱，它就没有反应

---

如果在

工作线程中使用
尝试catch
，则如果您想显示
土司
，那么恐怕它就行不通了。您必须在
主（UI）线程中执行此操作

请尝试以下操作：

package com.example.m2mai;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.sql.Timestamp;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;

import org.json.JSONArray;
import org.json.JSONObject;

import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Toast;


public class RetrieveActivity extends Activity {


    @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_retrieve);
    }



    public void getStream(View v)
    {   
        new MyAsyncTask().execute();
    }

private class MyAsyncTask extends AsyncTask<String, Void, String>
{   
    ArrayList<String> mNameList = new ArrayList<String>();
    public ArrayList<String> atList=new ArrayList<String>();
    public ArrayList<String> dataList=new ArrayList<String>();


        protected String doInBackground(String... params) 
        {
            return getData();

        }
        public long getDateTo() 
      {
        EditText toText = (EditText)findViewById(R.id.dateTo);
        String To = toText.getText().toString();

        DateFormat dateFormatTo = new SimpleDateFormat("dd/MM/yyyy");
        Date dateTo = null;
        try {
            dateTo = dateFormatTo.parse(To);
        } catch (java.text.ParseException e) {
            .runOnUiThread(new Runnable(){
                  public void run() {
                      Toast.makeText(getApplicationContext(),"Please key in the correct input",    Toast.LENGTH_LONG).show();
                  }
                });
            e.printStackTrace();
        }
        long timeTo = dateTo.getTime();
        new Timestamp(timeTo);  
        return timeTo/1000;

      }

        protected String getData()
        {
            String toTS = ""+getDateTo();
            String decodedString="";
            String returnMsg="";
            String request = "http://api.carriots.com/devices/defaultDevice@eric3231559.eric3231559/streams/?order=-1&max=10&at_to="+toTS;
            URL url;
            HttpURLConnection connection = null;  
            try {
                url = new URL(request); 
                connection = (HttpURLConnection) url.openConnection();

                connection.addRequestProperty("carriots.apikey", "1234567");
                connection.addRequestProperty("Content-Type", "application/json");
                connection.setRequestMethod("GET"); 

                BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
                while ((decodedString = in.readLine()) != null) 
                {
                    returnMsg+=decodedString;
                }
                in.close();
                connection.disconnect();
                JSONObject nodeRoot = new JSONObject(returnMsg); 
                JSONArray res = nodeRoot.getJSONArray("result");

                 for (int i = 0; i < res.length(); i++) 
                    {
                    JSONObject childJSON = res.getJSONObject(i);
                    if (childJSON.get("data")!=null)
                        {
                       String value = childJSON.getString("data");
                       dataList.add(value);
                       JSONObject node=new JSONObject(value);
                       atList.add(node.get("temperature").toString()); 
                        }
                    } 
                 }
                 catch (Exception e) 
            {
                e.printStackTrace(); 
                returnMsg=""+e;

            }
            return returnMsg;
        }

        protected void onPostExecute(String result)
            {


            for(int i = 0; i < atList.size(); i++)
            {
            ListView mainListView = (ListView) findViewById(R.id.listView1);


            ArrayAdapter<String>  mArrayAdapter = new ArrayAdapter<String>(RetrieveActivity.this,android.R.layout.simple_list_item_1,mNameList);


            mainListView.setAdapter(mArrayAdapter);

            mNameList.add(atList.get(i).toString());
            mArrayAdapter.notifyDataSetChanged();
            }
            Toast.makeText(getApplicationContext(),result, Toast.LENGTH_SHORT).show();
            EditText myData1=(EditText)findViewById(R.id.editText1);
            myData1.setText(atList.get(0));

            }
    }

}

如果您正在
工作线程中使用
try catch
，并且希望显示
Toast
，那么恐怕它将无法工作。您必须在
主（UI）线程中执行此操作

请尝试以下操作：

package com.example.m2mai;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.sql.Timestamp;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;

import org.json.JSONArray;
import org.json.JSONObject;

import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Toast;


public class RetrieveActivity extends Activity {


    @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_retrieve);
    }



    public void getStream(View v)
    {   
        new MyAsyncTask().execute();
    }

private class MyAsyncTask extends AsyncTask<String, Void, String>
{   
    ArrayList<String> mNameList = new ArrayList<String>();
    public ArrayList<String> atList=new ArrayList<String>();
    public ArrayList<String> dataList=new ArrayList<String>();


        protected String doInBackground(String... params) 
        {
            return getData();

        }
        public long getDateTo() 
      {
        EditText toText = (EditText)findViewById(R.id.dateTo);
        String To = toText.getText().toString();

        DateFormat dateFormatTo = new SimpleDateFormat("dd/MM/yyyy");
        Date dateTo = null;
        try {
            dateTo = dateFormatTo.parse(To);
        } catch (java.text.ParseException e) {
            .runOnUiThread(new Runnable(){
                  public void run() {
                      Toast.makeText(getApplicationContext(),"Please key in the correct input",    Toast.LENGTH_LONG).show();
                  }
                });
            e.printStackTrace();
        }
        long timeTo = dateTo.getTime();
        new Timestamp(timeTo);  
        return timeTo/1000;

      }

        protected String getData()
        {
            String toTS = ""+getDateTo();
            String decodedString="";
            String returnMsg="";
            String request = "http://api.carriots.com/devices/defaultDevice@eric3231559.eric3231559/streams/?order=-1&max=10&at_to="+toTS;
            URL url;
            HttpURLConnection connection = null;  
            try {
                url = new URL(request); 
                connection = (HttpURLConnection) url.openConnection();

                connection.addRequestProperty("carriots.apikey", "1234567");
                connection.addRequestProperty("Content-Type", "application/json");
                connection.setRequestMethod("GET"); 

                BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
                while ((decodedString = in.readLine()) != null) 
                {
                    returnMsg+=decodedString;
                }
                in.close();
                connection.disconnect();
                JSONObject nodeRoot = new JSONObject(returnMsg); 
                JSONArray res = nodeRoot.getJSONArray("result");

                 for (int i = 0; i < res.length(); i++) 
                    {
                    JSONObject childJSON = res.getJSONObject(i);
                    if (childJSON.get("data")!=null)
                        {
                       String value = childJSON.getString("data");
                       dataList.add(value);
                       JSONObject node=new JSONObject(value);
                       atList.add(node.get("temperature").toString()); 
                        }
                    } 
                 }
                 catch (Exception e) 
            {
                e.printStackTrace(); 
                returnMsg=""+e;

            }
            return returnMsg;
        }

        protected void onPostExecute(String result)
            {


            for(int i = 0; i < atList.size(); i++)
            {
            ListView mainListView = (ListView) findViewById(R.id.listView1);


            ArrayAdapter<String>  mArrayAdapter = new ArrayAdapter<String>(RetrieveActivity.this,android.R.layout.simple_list_item_1,mNameList);


            mainListView.setAdapter(mArrayAdapter);

            mNameList.add(atList.get(i).toString());
            mArrayAdapter.notifyDataSetChanged();
            }
            Toast.makeText(getApplicationContext(),result, Toast.LENGTH_SHORT).show();
            EditText myData1=(EditText)findViewById(R.id.editText1);
            myData1.setText(atList.get(0));

            }
    }

}

请尝试以下操作：

package com.example.m2mai;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.sql.Timestamp;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;

import org.json.JSONArray;
import org.json.JSONObject;

import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Toast;


public class RetrieveActivity extends Activity {


    @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_retrieve);
    }



    public void getStream(View v)
    {   
        new MyAsyncTask().execute();
    }

private class MyAsyncTask extends AsyncTask<String, Void, String>
{   
    ArrayList<String> mNameList = new ArrayList<String>();
    public ArrayList<String> atList=new ArrayList<String>();
    public ArrayList<String> dataList=new ArrayList<String>();


        protected String doInBackground(String... params) 
        {
            return getData();

        }
        public long getDateTo() 
      {
        EditText toText = (EditText)findViewById(R.id.dateTo);
        String To = toText.getText().toString();

        DateFormat dateFormatTo = new SimpleDateFormat("dd/MM/yyyy");
        Date dateTo = null;
        try {
            dateTo = dateFormatTo.parse(To);
        } catch (java.text.ParseException e) {
            .runOnUiThread(new Runnable(){
                  public void run() {
                      Toast.makeText(getApplicationContext(),"Please key in the correct input",    Toast.LENGTH_LONG).show();
                  }
                });
            e.printStackTrace();
        }
        long timeTo = dateTo.getTime();
        new Timestamp(timeTo);  
        return timeTo/1000;

      }

        protected String getData()
        {
            String toTS = ""+getDateTo();
            String decodedString="";
            String returnMsg="";
            String request = "http://api.carriots.com/devices/defaultDevice@eric3231559.eric3231559/streams/?order=-1&max=10&at_to="+toTS;
            URL url;
            HttpURLConnection connection = null;  
            try {
                url = new URL(request); 
                connection = (HttpURLConnection) url.openConnection();

                connection.addRequestProperty("carriots.apikey", "1234567");
                connection.addRequestProperty("Content-Type", "application/json");
                connection.setRequestMethod("GET"); 

                BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
                while ((decodedString = in.readLine()) != null) 
                {
                    returnMsg+=decodedString;
                }
                in.close();
                connection.disconnect();
                JSONObject nodeRoot = new JSONObject(returnMsg); 
                JSONArray res = nodeRoot.getJSONArray("result");

                 for (int i = 0; i < res.length(); i++) 
                    {
                    JSONObject childJSON = res.getJSONObject(i);
                    if (childJSON.get("data")!=null)
                        {
                       String value = childJSON.getString("data");
                       dataList.add(value);
                       JSONObject node=new JSONObject(value);
                       atList.add(node.get("temperature").toString()); 
                        }
                    } 
                 }
                 catch (Exception e) 
            {
                e.printStackTrace(); 
                returnMsg=""+e;

            }
            return returnMsg;
        }

        protected void onPostExecute(String result)
            {


            for(int i = 0; i < atList.size(); i++)
            {
            ListView mainListView = (ListView) findViewById(R.id.listView1);


            ArrayAdapter<String>  mArrayAdapter = new ArrayAdapter<String>(RetrieveActivity.this,android.R.layout.simple_list_item_1,mNameList);


            mainListView.setAdapter(mArrayAdapter);

            mNameList.add(atList.get(i).toString());
            mArrayAdapter.notifyDataSetChanged();
            }
            Toast.makeText(getApplicationContext(),result, Toast.LENGTH_SHORT).show();
            EditText myData1=(EditText)findViewById(R.id.editText1);
            myData1.setText(atList.get(0));

            }
    }

}

在
getDateTo（）
中：


在
getData（）
中：


在
onPostExecute
中：

   long dateTo = -1L;
    if((dateTo = getDateTo()) == -1L){
        return null;
    }
    String toTS = "" + getDateTo();


请尝试以下操作：

package com.example.m2mai;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.sql.Timestamp;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;

import org.json.JSONArray;
import org.json.JSONObject;

import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Toast;


public class RetrieveActivity extends Activity {


    @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_retrieve);
    }



    public void getStream(View v)
    {   
        new MyAsyncTask().execute();
    }

private class MyAsyncTask extends AsyncTask<String, Void, String>
{   
    ArrayList<String> mNameList = new ArrayList<String>();
    public ArrayList<String> atList=new ArrayList<String>();
    public ArrayList<String> dataList=new ArrayList<String>();


        protected String doInBackground(String... params) 
        {
            return getData();

        }
        public long getDateTo() 
      {
        EditText toText = (EditText)findViewById(R.id.dateTo);
        String To = toText.getText().toString();

        DateFormat dateFormatTo = new SimpleDateFormat("dd/MM/yyyy");
        Date dateTo = null;
        try {
            dateTo = dateFormatTo.parse(To);
        } catch (java.text.ParseException e) {
            .runOnUiThread(new Runnable(){
                  public void run() {
                      Toast.makeText(getApplicationContext(),"Please key in the correct input",    Toast.LENGTH_LONG).show();
                  }
                });
            e.printStackTrace();
        }
        long timeTo = dateTo.getTime();
        new Timestamp(timeTo);  
        return timeTo/1000;

      }

        protected String getData()
        {
            String toTS = ""+getDateTo();
            String decodedString="";
            String returnMsg="";
            String request = "http://api.carriots.com/devices/defaultDevice@eric3231559.eric3231559/streams/?order=-1&max=10&at_to="+toTS;
            URL url;
            HttpURLConnection connection = null;  
            try {
                url = new URL(request); 
                connection = (HttpURLConnection) url.openConnection();

                connection.addRequestProperty("carriots.apikey", "1234567");
                connection.addRequestProperty("Content-Type", "application/json");
                connection.setRequestMethod("GET"); 

                BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
                while ((decodedString = in.readLine()) != null) 
                {
                    returnMsg+=decodedString;
                }
                in.close();
                connection.disconnect();
                JSONObject nodeRoot = new JSONObject(returnMsg); 
                JSONArray res = nodeRoot.getJSONArray("result");

                 for (int i = 0; i < res.length(); i++) 
                    {
                    JSONObject childJSON = res.getJSONObject(i);
                    if (childJSON.get("data")!=null)
                        {
                       String value = childJSON.getString("data");
                       dataList.add(value);
                       JSONObject node=new JSONObject(value);
                       atList.add(node.get("temperature").toString()); 
                        }
                    } 
                 }
                 catch (Exception e) 
            {
                e.printStackTrace(); 
                returnMsg=""+e;

            }
            return returnMsg;
        }

        protected void onPostExecute(String result)
            {


            for(int i = 0; i < atList.size(); i++)
            {
            ListView mainListView = (ListView) findViewById(R.id.listView1);


            ArrayAdapter<String>  mArrayAdapter = new ArrayAdapter<String>(RetrieveActivity.this,android.R.layout.simple_list_item_1,mNameList);


            mainListView.setAdapter(mArrayAdapter);

            mNameList.add(atList.get(i).toString());
            mArrayAdapter.notifyDataSetChanged();
            }
            Toast.makeText(getApplicationContext(),result, Toast.LENGTH_SHORT).show();
            EditText myData1=(EditText)findViewById(R.id.editText1);
            myData1.setText(atList.get(0));

            }
    }

}

在
getDateTo（）
中：


在
getData（）
中：


在
onPostExecute
中：

   long dateTo = -1L;
    if((dateTo = getDateTo()) == -1L){
        return null;
    }
    String toTS = "" + getDateTo();


使
布尔标志=false全局

内部捕捉块make
flag=true

在
if
块中运行Toast

if(result == null) {
        return;
    }

里面