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问题:
I have this script.
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?
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:
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
Manifest
<?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?
回答1:
The clue is in the logcat:
Caused by: java.lang.SecurityException: Permission denied (missing INTERNET permission?)
You are missing android.permission.INTERNET permission in your AndroidManifest. Add this line:
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
just below:
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
回答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
}
}
回答3:
try with this way .
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
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
ListView listview;
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));
// adapter set data items
public class MyArrayAdapter implements ListAdapter {
Activity activity;
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;
}
}
回答4:
to post using asychtask can done by follow
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
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
compile 'org.apache.httpcomponents:httpclient:jar:4.5.2'
compile 'org.apache.httpcomponents:httpcore:4.4.1'
