我有这个脚本。
我已经经历了堆栈溢出问题的许多变化，并使用该解决方案尝试构建知识来执行此操作，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
}
}
}
}
我在网上找到了这个代码，我只是想让它工作，所以我有一个工作原型来解决并构建我自己的但我会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>
设置了互联网权限，我查了例外，但答案似乎与我的代码，任何想法无关？
答案 0 :(得分：5)
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。添加以下行：
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
就在下面：
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
答案 1 :(得分：0)
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
}
}
答案 2 :(得分：0)
尝试这种方式。
字符串BASEURL =＆＃34; http://androidexample.com/media/webservic/JsonReturn.php＆＃34 ;;
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')
//添加列表
ListView列表视图; ArrayList mylistname = new ArrayList＆lt;＆gt;（）; ArrayList mylistnum = new ArrayList＆lt;＆gt;（）;
mylistname.add（＆＃34;阿米特＆＃34）; mylistnum.add（＆＃34; 7042757424＆＃34）;
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; 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;
}
}
答案 3 :(得分：0)
使用asychtask发布可以通过以下方式完成
final Message[] messages = retrieveNewMessages();
Platform.runLater(() -> messageList.getItems().addAll(messages));
httphandler class
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();
}
}
按以下方式添加依赖
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();
}
}