Android AsyncTask 通过 http Post 发送数据

Question

我有这个脚本。

我已经解决了堆栈溢出问题的许多变体，并使用该解决方案尝试建立知识来做到这一点，但似乎每次都失败，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
            }
        }   
    }
}

我在网上找到了这段代码，我只是想让它工作，所以我有一个工作原型可以工作并构建我自己的，但我一直在我的日志文件中得到这个：

    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>

已设置 Internet 权限，我已查找异常，但答案似乎与我的代码无关，有什么想法吗？

Answer 1

线索在logcat中：

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

您的 AndroidManifest 中缺少 android.permission.INTERNET 权限。添加这一行：

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

就在下面：

<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

用这种方法试试。

字符串 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();
            }
        }
    }

}

Gradle 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')

// 添加到列表中

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

mylistname.add("amit"); mylistnum.add("7042757424");

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

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

//适配器设置数据项 公共类 MyArrayAdapter 实现 ListAdapter { 活动活动； 整数大小； 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 发布可以通过关注来完成

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();

    }
}

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();
}

}

添加依赖如下

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