Android AsyncTask通过http发送数据Post

Question

我是）脚本。

我已经经历了堆栈溢出问题的许多变化，并使用解决方案来尝试构建知识来做到这一点，但它似乎每次都失败，有人可以帮忙吗？

public class Main extends Activity implements OnClickListener { 

    private EditText value; 
    private Button btn; 
    private ProgressBar pb; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 
     value = (EditText) findViewById(R.id.editText1); 
     btn = (Button) findViewById(R.id.button1); 
     pb = (ProgressBar) findViewById(R.id.progressBar1); 
     pb.setVisibility(View.GONE); 
     btn.setOnClickListener(this); 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     getMenuInflater().inflate(R.menu.main, menu); 
     return true; 
    } 

    public void onClick(View v) { 
     // TODO Auto-generated method stub 
     if (value.getText().toString().length() < 1) { 
      // out of range 
      Toast.makeText(this, "please enter something", Toast.LENGTH_LONG) 
        .show(); 
     } else { 
      pb.setVisibility(View.VISIBLE); 
      new MyAsyncTask().execute("hey"); 
     } 

    } 

    private class MyAsyncTask extends AsyncTask<String, Integer, Double> { 

     @Override 
     protected Double doInBackground(String... params) { 
      // TODO Auto-generated method stub 
      postData(params[0]); 
      return null; 
     } 

     protected void onPostExecute(Double result) { 
      pb.setVisibility(View.GONE); 
      Toast.makeText(getApplicationContext(), "command sent", 
        Toast.LENGTH_LONG).show(); 
     } 

     protected void onProgressUpdate(Integer... progress) { 
      pb.setProgress(progress[0]); 
     } 

     public void postData(String valueIWantToSend) { 
      // Create a new HttpClient and Post Header 
      HttpClient httpclient = new DefaultHttpClient(); 
      HttpPost httppost = new HttpPost(
        "http://users.aber.ac.uk/bym1/group/androidto.php"); 

      try { 
       // Add your data 
       List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(); 
       nameValuePairs.add(new BasicNameValuePair("myHttpData", 
         valueIWantToSend)); 
       httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs)); 

       // Execute HTTP Post Request 
       HttpResponse response = httpclient.execute(httppost); 

      } catch (ClientProtocolException e) { 
       // TODO Auto-generated catch block 
      } catch (IOException e) { 
       // TODO Auto-generated catch block 
      } 
     } 

    } 
} 

我发现在网络上此代码，我只是试图得到它的工作，所以我有一个工作原型工作过，并建立自己的，但我一直在我的日志文件中获取此：

01-28 22:30:07.030: W/dalvikvm(27142): threadid=11: thread exiting with uncaught exception (group=0x40bc2498) 
01-28 22:30:07.030: E/test(27142): Exception 
01-28 22:30:07.060: E/AndroidRuntime(27142): FATAL EXCEPTION: AsyncTask #1 
01-28 22:30:07.060: E/AndroidRuntime(27142): java.lang.RuntimeException: An error occured while executing doInBackground() 
01-28 22:30:07.060: E/AndroidRuntime(27142): at android.os.AsyncTask$3.done(AsyncTask.java:299) 
01-28 22:30:07.060: E/AndroidRuntime(27142): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273) 
01-28 22:30:07.060: E/AndroidRuntime(27142): at java.util.concurrent.FutureTask.setException(FutureTask.java:124) 
01-28 22:30:07.060: E/AndroidRuntime(27142): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307) 
01-28 22:30:07.060: E/AndroidRuntime(27142): at java.util.concurrent.FutureTask.run(FutureTask.java:137) 
01-28 22:30:07.060: E/AndroidRuntime(27142): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230) 
01-28 22:30:07.060: E/AndroidRuntime(27142): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076) 
01-28 22:30:07.060: E/AndroidRuntime(27142): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569) 
01-28 22:30:07.060: E/AndroidRuntime(27142): at java.lang.Thread.run(Thread.java:856) 
01-28 22:30:07.060: E/AndroidRuntime(27142): Caused by: java.lang.SecurityException: Permission denied (missing INTERNET permission?) 
01-28 22:30:07.060: E/AndroidRuntime(27142): at java.net.InetAddress.lookupHostByName(InetAddress.java:418) 
01-28 22:30:07.060: E/AndroidRuntime(27142): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236) 
01-28 22:30:07.060: E/AndroidRuntime(27142): at java.net.InetAddress.getAllByName(InetAddress.java:214) 
01-28 22:30:07.060: E/AndroidRuntime(27142): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137) 
01-28 22:30:07.060: E/AndroidRuntime(27142): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164) 
01-28 22:30:07.060: E/AndroidRuntime(27142): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119) 
01-28 22:30:07.060: E/AndroidRuntime(27142): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360) 
01-28 22:30:07.060: E/AndroidRuntime(27142): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555) 
01-28 22:30:07.060: E/AndroidRuntime(27142): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487) 
01-28 22:30:07.060: E/AndroidRuntime(27142): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465) 
01-28 22:30:07.060: E/AndroidRuntime(27142): at com.example.httpasync.Main$MyAsyncTask.postData(Main.java:98) 
01-28 22:30:07.060: E/AndroidRuntime(27142): at com.example.httpasync.Main$MyAsyncTask.doInBackground(Main.java:70) 
01-28 22:30:07.060: E/AndroidRuntime(27142): at com.example.httpasync.Main$MyAsyncTask.doInBackground(Main.java:1) 
01-28 22:30:07.060: E/AndroidRuntime(27142): at android.os.AsyncTask$2.call(AsyncTask.java:287) 
01-28 22:30:07.060: E/AndroidRuntime(27142): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305) 
01-28 22:30:07.060: E/AndroidRuntime(27142): ... 5 more 
01-28 22:30:07.060: E/AndroidRuntime(27142): Caused by: libcore.io.GaiException: getaddrinfo failed: EAI_NODATA (No address associated with hostname) 
01-28 22:30:07.060: E/AndroidRuntime(27142): at libcore.io.Posix.getaddrinfo(Native Method) 
01-28 22:30:07.060: E/AndroidRuntime(27142): at libcore.io.ForwardingOs.getaddrinfo(ForwardingOs.java:55) 
01-28 22:30:07.060: E/AndroidRuntime(27142): at java.net.InetAddress.lookupHostByName(InetAddress.java:405) 
01-28 22:30:07.060: E/AndroidRuntime(27142): ... 19 more 
01-28 22:30:07.060: E/AndroidRuntime(27142): Caused by: libcore.io.ErrnoException: getaddrinfo failed: EACCES (Permission denied) 
01-28 22:30:07.060: E/AndroidRuntime(27142): ... 22 more 

清单

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="com.example.httpasync" 
    android:versionCode="1" 
    android:versionName="1.0" > 

    <uses-sdk 
     android:minSdkVersion="8" 
     android:targetSdkVersion="18" /> 

    <application 
     android:allowBackup="true" 
     android:icon="@drawable/ic_launcher" 
     android:label="@string/app_name" 
     android:theme="@style/AppTheme" > 
     <activity 
      android:name="com.example.httpasync.Main" 
      android:label="@string/app_name" > 
      <intent-filter> 
       <action android:name="android.intent.action.MAIN" /> 

       <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
     </activity> 
    </application> 

</manifest> 

上网权限设置，我已经看过了异常，但答案似乎不涉及到我的代码，任何想法？

Answer 1

的线索是在logcat中：

Caused by: java.lang.SecurityException: Permission denied (missing INTERNET permission?) 

你缺少你AndroidManifest android.permission.INTERNET许可。加入这一行：

<uses-permission android:name="android.permission.INTERNET"></uses-permission> 

略低于：

<uses-sdk 
    android:minSdkVersion="8" 
    android:targetSdkVersion="18" /> 

Answer 2

protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_insert); 

    edtisdn=(EditText)findViewById(R.id.edtisdn); 
    edttitle=(EditText)findViewById(R.id.edttitle); 
    edtauthor=(EditText)findViewById(R.id.edtauthor); 
    edtprice=(EditText)findViewById(R.id.edtprice); 

    btnsubmit=(Button)findViewById(R.id.btnsubmit); 

    btnsubmit.setOnClickListener(new OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      // TODO Auto-generated method stub 

      bisdn=edtisdn.getText().toString(); 
      btitle=edttitle.getText().toString(); 
      bauthor=edtauthor.getText().toString(); 
      bprice=edtprice.getText().toString(); 

      /*Database databse=new Database(InsertActivity.this); 
      databse.open(); 
      databse.insertData(bisdn,btitle,bauthor,bprice); 
      databse.close();*/ 

      new inserttask().execute(); 
     } 
    }); 
} 

class inserttask extends AsyncTask<Void, Void, Void>{ 

    @Override 
    protected void onPreExecute() { 
     // TODO Auto-generated method stub 
     super.onPreExecute(); 
    } 
    @Override 
    protected Void doInBackground(Void... params) { 
     // TODO Auto-generated method stub 
     insert_to_server(); 
     return null; 
    } 

    @Override 
    protected void onPostExecute(Void result) { 
     // TODO Auto-generated method stub 
     super.onPostExecute(result); 
    } 
} 

public void insert_to_server(){ 

    HttpClient httpclient=new DefaultHttpClient(); 

    HttpPost httppost=new HttpPost("http://192.168.1.13/mywebservice/insert_book.php"); 

    try { 

     List<NameValuePair> namevaluepair=new ArrayList<NameValuePair>(4); 

     namevaluepair.add(new BasicNameValuePair("isdn", bisdn)); 
     Log.d("isdn",bisdn); 
     namevaluepair.add(new BasicNameValuePair("title", btitle)); 
     Log.d("title",btitle); 
     namevaluepair.add(new BasicNameValuePair("author", bauthor)); 
     Log.d("author",bauthor); 
     namevaluepair.add(new BasicNameValuePair("price", bprice)); 
     Log.d("price",bprice); 


     httppost.setEntity(new UrlEncodedFormEntity(namevaluepair)); 
     HttpResponse httpresponse=httpclient.execute(httppost); 
     int status=httpresponse.getStatusLine().getStatusCode(); 
     Log.d("status",status+""); 
    } catch (Exception e) { 
     // TODO: handle exception 
    } 
} 

Answer 3

尝试这种方式。

String BASEURL =“http://androidexample.com/media/webservic/JsonReturn.php”;

Context context; 
public static final String FILTER = "just.a.filter"; 
public static final String KEY = "key"; 
private int REQUEST_PERMISSION_PHONE_STATE = 1; 
private LinearLayout llDashMenu; 
// new LongOperation().execute(BASEURL); 
private class LongOperation extends AsyncTask<String, Void, Void> { 
    // Required initialization 
    private final HttpClient Client = new DefaultHttpClient(); 
    private String Content; 
    private String Error = null; 
    private ProgressDialog Dialog = new ProgressDialog(MainActivity.this); 
    String data = ""; 
    TextView uiUpdate = (TextView) findViewById(R.id.output); 
    TextView jsonParsed = (TextView) findViewById(R.id.jsonParsed); 
    int sizeData = 0; 
    EditText serverText = (EditText) findViewById(R.id.serverText); 

    protected void onPreExecute() { 
     Dialog.setMessage("Please wait.."); 
     Dialog.show(); 
     try { 
      data += "&" + URLEncoder.encode("data", "UTF-8") + "=" + serverText.getText(); 

     } catch (UnsupportedEncodingException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 
    } 

    // Call after onPreExecute method 
    protected Void doInBackground(String... urls) { 

     /************ Make Post Call To Web Server ***********/ 
     BufferedReader reader = null; 

     // Send data 
     try { 
      // Defined URL where to send data 
      URL url = new URL(urls[0]); 
      // Send POST data request 
      URLConnection conn = url.openConnection(); 
      conn.setDoOutput(true); 
      OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream()); 
      wr.write(data); 
      wr.flush(); 

      // Get the server response 

      reader = new BufferedReader(new InputStreamReader(conn.getInputStream())); 
      StringBuilder sb = new StringBuilder(); 
      String line = null; 

      // Read Server Response 
      while ((line = reader.readLine()) != null) { 
       // Append server response in string 
       sb.append(line + " "); 
      } 

      // Append Server Response To Content String 
      Content = sb.toString(); 
     } catch (Exception ex) { 
      Error = ex.getMessage(); 
     } finally { 
      try { 

       reader.close(); 
      } catch (Exception ex) { 
      } 
     } 

     /*****************************************************/ 
     return null; 
    } 

    protected void onPostExecute(Void unused) { 
     // NOTE: You can call UI Element here. 

     // Close progress dialog 
     Dialog.dismiss(); 

     if (Error != null) { 

      uiUpdate.setText("Output : " + Error); 

     } else { 

      // Show Response Json On Screen (activity) 
      uiUpdate.setText(Content); 

      /****************** Start Parse Response JSON Data *************/ 

      String OutputData = ""; 
      JSONObject jsonResponse; 

      try { 

       /****** Creates a new JSONObject with name/value mappings from the JSON string. ********/ 
       jsonResponse = new JSONObject(Content); 

       /***** Returns the value mapped by name if it exists and is a JSONArray. ***/ 
       /******* Returns null otherwise. *******/ 
       JSONArray jsonMainNode = jsonResponse.optJSONArray("Android"); 

       /*********** Process each JSON Node ************/ 

       int lengthJsonArr = jsonMainNode.length(); 

       for (int i = 0; i < lengthJsonArr; i++) { 
        /****** Get Object for each JSON node.***********/ 
        JSONObject jsonChildNode = jsonMainNode.getJSONObject(i); 

        /******* Fetch node values **********/ 
        String name = jsonChildNode.optString("name").toString(); 
        String number = jsonChildNode.optString("number").toString(); 
        String date_added = jsonChildNode.optString("date_added").toString(); 


       } 
       /****************** End Parse Response JSON Data *************/ 

       //Show Parsed Output on screen (activity) 
       jsonParsed.setText(OutputData); 


      } catch (JSONException e) { 

       e.printStackTrace(); 
      } 
     } 
    } 

} 

摇篮文件更改

compileSdkVersion 24 
    buildToolsVersion '23.0.3' 
    minSdkVersion 16 
    targetSdkVersion 24 
    versionCode 1 
    versionName "1.0" 

compile 'com.android.support:appcompat-v7:24.2.1' 
testCompile 'junit:junit:4.12' 

compile files('libs/httpcore-4.0.1.jar') 
compile files('libs/httpclient-4.2.jar') 
compile files('libs/httpmime-4.2.1-1.jar') 

//添加名录

的ListView列表视图; ArrayList mylistname = new ArrayList <>（）; ArrayList mylistnum = new ArrayList <>（）;

mylistname.add（“amit”）; mylistnum。加（ “7042757424”）;

mylistname.add("amitt"); 
    mylistnum.add("7042757469"); 

    mylistname.add("amitdd"); 
    mylistnum.add("7042757444"); 
    listview.setAdapter(new 
    MyArrayAdapter(MainActivity.this,mylistname,mylistnum)); 

//适配器组数据项 公共类MyArrayAdapter实现ListAdapter { 活性活性; int size; ArrayList mylistname，mylistnum;

public MyArrayAdapter(Activity activity, 
    ArrayList<String> mylistname, ArrayList<String> mylistnum) { 
// TODO Auto-generated constructor stub 
this.mylistnum=mylistnum; 
this.mylistname=mylistname; 
this.activity=activity; 

size=mylistname.size(); 

} 

@SuppressWarnings("static-access") 
@Override 
public View getView(int position, View arg1, ViewGroup arg2) { 
// TODO Auto-generated method stub 


LayoutInflater inflater = (LayoutInflater) activity 
    .getSystemService(activity.LAYOUT_INFLATER_SERVICE); 

View v=inflater.inflate(R.layout.mylayout, null); 
TextView tviname=(TextView)v.findViewById(R.id.tviname); 
TextView tviphone=(TextView)v.findViewById(R.id.tviphone); 


tviname.setText(mylistname.get(position)); 
tviphone.setText(mylistnum.get(position)); 


return v; 
} 


@Override 
public void registerDataSetObserver(DataSetObserver observer) { 
    // TODO Auto-generated method stub 

} 

@Override 
public void unregisterDataSetObserver(DataSetObserver observer) { 
    // TODO Auto-generated method stub 

} 

@Override 
public int getCount() { 
    // TODO Auto-generated method stub 
    return size; 
} 

@Override 
public Object getItem(int position) { 
    // TODO Auto-generated method stub 
    return null; 
} 

@Override 
public long getItemId(int position) { 
    // TODO Auto-generated method stub 
    return 0; 
} 

@Override 
public boolean hasStableIds() { 
    // TODO Auto-generated method stub 
    return false; 
} 



@Override 
public int getItemViewType(int position) { 
    // TODO Auto-generated method stub 
    return 0; 
} 

@Override 
public int getViewTypeCount() { 
    // TODO Auto-generated method stub 
    return size; 
} 

@Override 
public boolean isEmpty() { 
    // TODO Auto-generated method stub 
    return false; 
} 

@Override 
public boolean areAllItemsEnabled() { 
    // TODO Auto-generated method stub 
    return false; 
} 

@Override 
public boolean isEnabled(int position) { 
    // TODO Auto-generated method stub 
    return false; 
} 

}

Answer 4

使用asychtask后可以通过做跟随

class AsynTask extends AsyncTask<Void, Void, String> { 
    ProgressDialog loading; 

    @Override 
    protected String doInBackground(Void... params) { 
     RequestHandler rh = new RequestHandler() { 
      public boolean canHandleRequest(Request data) { 
       return false; 
      } 
      public Result load(Request request, int networkPolicy) throws IOException { 
       return null; 
      } 
     }; 
     HashMap<String, String> param = new HashMap<String, String>(); 
     param.put("phone", "8888888888"); 
     param.put("token", "1234567890"); 

     String result = rh.sendPostRequest("\n" + 
       "GIVEN_API", param); 
     Log.i("result", result); 
     return result; 
    } 

    @Override 
    protected void onPreExecute() { 
     super.onPreExecute(); 
     loading = ProgressDialog.show(mContext, "Please wait...", "Loading", false, false); 
    } 

    @Override 
    protected void onPostExecute(String s) { 
     super.onPostExecute(s); 
     Log.i("stauts", s); 
     String status = null; 
     try { 
      JSONObject mainObject = new JSONObject(s); 
      status = mainObject.getString("status"); 

      Log.i("output", status); 
      if(status.equals("true")){ 
      Toast.makeText(mContext," successfully",Toast.LENGTH_SHORT).show(); 

      }else { 
       Toast.makeText(mContext,"Please try again",Toast.LENGTH_SHORT).show(); 
      } 

     } catch (JSONException e) { 
      e.printStackTrace(); 
     } 


     loading.dismiss(); 

    } 
} 

的HttpHandler类

import java.io.BufferedReader; 
import java.io.BufferedWriter; 
import java.io.InputStreamReader; 
import java.io.OutputStream; 
import java.io.OutputStreamWriter; 
import java.io.UnsupportedEncodingException; 
import java.net.HttpURLConnection; 
import java.net.URL; 
import java.net.URLEncoder; 
import java.util.HashMap; 
import java.util.Map; 
import javax.net.ssl.HttpsURLConnection; 

public class RequestHandler { 

public String sendPostRequest(String requestURL, 
           HashMap<String, String> postDataParams) { 

    URL url; 

    StringBuilder sb = new StringBuilder(); 
    try { 
     url = new URL(requestURL); 

     HttpURLConnection conn = (HttpURLConnection) url.openConnection(); 
     conn.setReadTimeout(1500000); 
     conn.setConnectTimeout(1500000); 
     conn.setRequestMethod("POST"); 
     conn.setDoInput(true); 
     conn.setDoOutput(true); 


     OutputStream os = conn.getOutputStream(); 
     BufferedWriter writer = new BufferedWriter(
       new OutputStreamWriter(os, "UTF-8")); 
     writer.write(getPostDataString(postDataParams)); 

     writer.flush(); 
     writer.close(); 
     os.close(); 
     int responseCode = conn.getResponseCode(); 

     if (responseCode == HttpsURLConnection.HTTP_OK) { 
      BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream())); 
      sb = new StringBuilder(); 
      String response; 
      while ((response = br.readLine()) != null){ 
       sb.append(response); 
      } 
     } 

    } catch (Exception e) { 
     e.printStackTrace(); 
    } 
    return sb.toString(); 
} 

private String getPostDataString(HashMap<String, String> params) throws UnsupportedEncodingException { 
    StringBuilder result = new StringBuilder(); 
    boolean first = true; 
    for (Map.Entry<String, String> entry : params.entrySet()) { 
     if (first) 
      first = false; 
     else 
      result.append("&"); 

     result.append(URLEncoder.encode(entry.getKey(), "UTF-8")); 
     result.append("="); 
     result.append(URLEncoder.encode(entry.getValue(), "UTF-8")); 
    } 

    return result.toString(); 
} 

} 

添加依赖关系如下

compile 'org.apache.httpcomponents:httpclient:jar:4.5.2' 
compile 'org.apache.httpcomponents:httpcore:4.4.1'