我正在尝试检查登录凭据，但我一次又一次地收到这些错误，我已经尝试了一切。我是android的新手 任何形式的帮助将不胜感激。如果有其他好的方法来实现它，想知道如何暗示
错误
Error:(19, 30) error: package org.apache.http.client does not exist
Error:(15, 23) error: package org.apache.http does not exist
Error:(16, 23) error: package org.apache.http does not exist
Error:(17, 23) error: package org.apache.http does not exist
Error:(18, 30) error: package org.apache.http.client does not exist
Error:(20, 37) error: package org.apache.http.client.entity does not exist
Error:(21, 38) error: package org.apache.http.client.methods does not exist
Error:(22, 35) error: package org.apache.http.impl.client does not exist
Error:(23, 31) error: package org.apache.http.message does not exist
Error:(79, 22) error: cannot find symbol class NameValuePair
Error:(85, 49) error: cannot find symbol class DefaultHttpClient
Error:(86, 21) error: cannot find symbol class HttpPost
Error:(86, 45) error: cannot find symbol class HttpPost
Error:(88, 44) error: cannot find symbol class UrlEncodedFormEntity
Error:(90, 21) error: cannot find symbol class HttpResponse
Error:(92, 21) error: cannot find symbol class HttpEntity
Error:(105, 26) error: cannot find symbol class ClientProtocolException
Error:Execution failed for task ':app:compileDebugJavaWithJavac'.
> Compilation failed; see the compiler error output for details.
Error:(85, 21) error: cannot find symbol class HttpClient
Error:(81, 40) error: cannot find symbol class BasicNameValuePair
Error:(80, 40) error: cannot find symbol class BasicNameValuePair
Error:(79, 68) error: cannot find symbol class NameValuePair
MainActivity.java
package com.tarun.proxy_maar;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private EditText editTextUserName;
private EditText editTextPassword;
public static final String USER_NAME = "USERNAME";
String username;
String password;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
editTextUserName = (EditText) findViewById(R.id.editTextUserName);
editTextPassword = (EditText) findViewById(R.id.editTextPassword);
}
public void invokeLogin(View view){
username = editTextUserName.getText().toString();
password = editTextPassword.getText().toString();
login(username,password);
}
private void login(final String username, String password) {
class LoginAsync extends AsyncTask<String, Void, String>{
private Dialog loadingDialog;
@Override
protected void onPreExecute() {
super.onPreExecute();
loadingDialog = ProgressDialog.show(MainActivity.this, "Please wait", "Loading...");
}
@Override
protected String doInBackground(String... params) {
String uname = params[0];
String pass = params[1];
InputStream is = null;
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("username", uname));
nameValuePairs.add(new BasicNameValuePair("password", pass));
String result = null;
try{
HttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(
"http://shaadi.web44.net/hello.php");
httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
HttpResponse response = httpClient.execute(httpPost);
HttpEntity entity = response.getEntity();
is = entity.getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null)
{
sb.append(line + "\n");
}
result = sb.toString();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return result;
}
@Override
protected void onPostExecute(String result){
String s = result.trim();
loadingDialog.dismiss();
if(s.equalsIgnoreCase("success")){
Intent intent = new Intent(MainActivity.this, UserProfile.class);
intent.putExtra(USER_NAME, username);
finish();
startActivity(intent);
}else {
Toast.makeText(getApplicationContext(), "Invalid User Name or Password", Toast.LENGTH_LONG).show();
}
}
}
LoginAsync la = new LoginAsync();
la.execute(username, password);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
答案 0 :(得分：44)
将其添加到build.gradle：
android {
useLibrary 'org.apache.http.legacy'
}
或者您使用HttpURLConnection class代替。
答案 1 :(得分：6)
{1}}和DefaultHttpClient类已在API级别22中弃用，并已在API级别23中删除。
Google甚至为他们取下了文档。
当文档仍然存在时，建议切换到NameValuePair以执行此类基本任务。
以下是AsyncTask的修改版本，适用于API级别23：
HttpUrlConnection全班代码：
class LoginAsync extends AsyncTask<String, Void, String>{
private Dialog loadingDialog;
String url = "http://shaadi.web44.net/hello.php";
String charset = "UTF-8";
HttpURLConnection conn;
DataOutputStream wr;
StringBuilder result = new StringBuilder();
URL urlObj;
JSONObject jObj = null;
StringBuilder sbParams;
String paramsString;
@Override
protected void onPreExecute() {
super.onPreExecute();
loadingDialog = ProgressDialog.show(MainActivity.this, "Please wait", "Loading...");
}
@Override
protected String doInBackground(String... params) {
String uname = params[0];
String pass = params[1];
sbParams = new StringBuilder();
try {
sbParams.append("name").append("=")
.append(URLEncoder.encode(uname, charset));
sbParams.append("&");
sbParams.append("password").append("=")
.append(URLEncoder.encode(pass, charset));
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
try {
urlObj = new URL(url);
conn = (HttpURLConnection) urlObj.openConnection();
conn.setDoOutput(true);
conn.setRequestMethod("POST");
conn.setRequestProperty("Accept-Charset", charset);
conn.setReadTimeout(10000);
conn.setConnectTimeout(15000);
conn.connect();
paramsString = sbParams.toString();
wr = new DataOutputStream(conn.getOutputStream());
wr.writeBytes(paramsString);
wr.flush();
wr.close();
} catch (IOException e) {
e.printStackTrace();
}
try {
//response from the server
InputStream in = new BufferedInputStream(conn.getInputStream());
BufferedReader reader = new BufferedReader(new InputStreamReader(in));
String line;
while ((line = reader.readLine()) != null) {
result.append(line);
}
} catch (IOException e) {
e.printStackTrace();
}
conn.disconnect();
return result.toString();
}
@Override
protected void onPostExecute(String result){
String s = result.trim();
loadingDialog.dismiss();
if(s.equalsIgnoreCase("success")){
Intent intent = new Intent(MainActivity.this, UserProfile.class);
intent.putExtra(USER_NAME, username);
finish();
startActivity(intent);
}else {
Toast.makeText(getApplicationContext(), "Invalid User Name or Password", Toast.LENGTH_LONG).show();
}
}
}