Android AsyncTask 通过 http Post 发送数据
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原文地址: http://stackoverflow.com/questions/21418349/
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时间：2020-08-20 04:33:01 来源:igfitidea点击:
Android AsyncTask sending data via http Post
提问by Random_Guy_a
I have this script.
我有这个脚本。
I have gone through many variations of the problem on stack overflow and used the solution to try and build the knowledge to do this but it seems to be failing everytime, can someone help?
我经历了堆栈溢出问题的许多变化，并使用该解决方案尝试建立知识来做到这一点，但似乎每次都失败了，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
}
}
}
}
I found this code on the net and I'm just trying to get it to work so i have a working prototype to work off and build my own but I keep getting this in my log file:
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.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$SerialExecutor.run(AsyncTask.java:230)
01-28 22:30:07.060: E/AndroidRuntime(27142): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
01-28 22:30:07.060: E/AndroidRuntime(27142): at java.util.concurrent.ThreadPoolExecutor$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$MyAsyncTask.doInBackground(Main.java:1)
01-28 22:30:07.060: E/AndroidRuntime(27142): at android.os.AsyncTask.call(AsyncTask.java:287)
01-28 22:30:07.060: E/AndroidRuntime(27142): at java.util.concurrent.FutureTask$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
Manifest
显现
<?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>
Internet permissions are set, I have looked up the exceptions but the answers dont seem to relate to my code, any ideas?
设置了 Internet 权限，我查找了例外情况，但答案似乎与我的代码无关，有什么想法吗？
回答by Melquiades
The clue is in the logcat:
线索在logcat中：
Caused by: java.lang.SecurityException: Permission denied (missing INTERNET permission?)
You are missing android.permission.INTERNETpermission in your AndroidManifest. Add this line:
您android.permission.INTERNET的 AndroidManifest中缺少权限。添加这一行：
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
just below:
略低于：
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
回答by Hardik Karkar
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
}
}
回答by Amitsharma
try with this way .
用这种方式试试。
String BASEURL = "http://androidexample.com/media/webservic/JsonReturn.php";
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();
}
}
}
}
Gradle file changes
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')
// add on list
// 添加到列表中
ListView listview; ArrayList mylistname=new ArrayList<>(); ArrayList mylistnum=new ArrayList<>();
列表视图列表视图；ArrayList mylistname=new ArrayList<>(); ArrayList mylistnum=new ArrayList<>();
mylistname.add("amit"); mylistnum.add("7042757424");
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));
// adapter set data items public class MyArrayAdapter implements ListAdapter { Activity activity; int size; ArrayList mylistname,mylistnum;
// 适配器集数据项 public class MyArrayAdapter 实现 ListAdapter { Activity activity; 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;
}
}
}
回答by Mahesh Pandit
to post using asychtask can done by follow
使用 asychtask 发布可以通过以下方式完成
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 class
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();
}
}
add dependency as follow
添加依赖如下
compile 'org.apache.httpcomponents:httpclient:jar:4.5.2'
compile 'org.apache.httpcomponents:httpcore:4.4.1'
