我正在实现一个应用程序，它访问一个 Web 服务来验证用户，但是我遇到了问题，这个 Web 服务工作，经过测试，但是每次我输入电子邮件和密码登录时，应用程序都会中断。
活动
package com.inform.edufindme.activity;
import com.inform.edufindme.R;
import com.inform.edufindme.task.ValidarUsuarioTask;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.widget.Button;
import android.widget.EditText;
import android.view.View;
public class LoginActivity extends Activity {
Button button_login;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
button_login = (Button)findViewById(R.id.button_login);
button_login.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
EditText editTextLogin = (EditText)findViewById(R.id.edit_text_email);
EditText editTextSenha = (EditText)findViewById(R.id.edit_text_senha);
//new ValidarUsuarioTask(LoginActivity.this).execute("vilker","12345");
new ValidarUsuarioTask(LoginActivity.this).execute(editTextLogin.getText().toString(),editTextSenha.getText().toString());
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.login, menu);
return true;
}
}
任务
package com.inform.edufindme.task;
import java.io.IOException;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import com.inform.edufindme.activity.EduMailActivity;
import com.inform.edufindme.activity.LoginActivity;
import com.inform.edufindme.utils.ConfiguracaoServidor;
import com.inform.edufindme.utils.ConverterStream;
import android.content.Context;
import android.content.Intent;
import android.os.AsyncTask;
public class ValidarUsuarioTask extends AsyncTask<String, Void, HttpResponse>{
private String recurso = "Validar_Usuario/Usuario/";
private Context contexto;
public ValidarUsuarioTask(Context contexto) {
this.contexto = contexto;
}
@Override
protected HttpResponse doInBackground(String... params) {
String email = params[0];
String senha = params[1];
return autenticarUsuario(email, senha);
}
@Override
protected void onPostExecute(HttpResponse response) {
HttpEntity entity = response.getEntity();
Integer statusAutenticacao;
String conteudoRequisicao = "";
try {
conteudoRequisicao = ConverterStream.convertInputStreamToString(entity.getContent());
}catch (Exception e) {
e.printStackTrace();
}
statusAutenticacao = getStatusValidacao(conteudoRequisicao);
if(statusAutenticacao.equals(0)){
Intent intent = new Intent(contexto, EduMailActivity.class);
contexto.startActivity(intent);
}else{
Intent intent = new Intent(contexto, EduMailActivity.class);
contexto.startActivity(intent);
}
}
private HttpResponse autenticarUsuario(String email, String senha) {
HttpClient httpclient = new DefaultHttpClient();
HttpGet httpget = new HttpGet(ConfiguracaoServidor.getInstancia().getURL()+recurso+email+"/"+senha);
HttpResponse response = null;
try {
response = httpclient.execute(httpget);
} catch (IOException e) {
System.out.println(e);
}
return response;
}
private Integer getStatusValidacao(String conteudo){
JSONArray result;
JSONObject validacao;
Integer statusValidacao = 0;
try {
result = new JSONObject(conteudo).getJSONArray("result");
validacao = (JSONObject)result.get(0);
statusValidacao = validacao.getInt("VALIDACAO");
} catch (JSONException e) {
e.printStackTrace();
}
return statusValidacao;
}
}
服务器配置
package com.inform.edufindme.utils;
public class ConfiguracaoServidor {
private String server = "172.20.10.9";
private String port = "2000";
private static ConfiguracaoServidor instancia = new ConfiguracaoServidor();
private ConfiguracaoServidor() {
super();
}
public static ConfiguracaoServidor getInstancia() {
return instancia;
}
public String getURL(){
return new StringBuilder().append("http://").append(server).append(":").append(port).append("/").toString();
}
}
日志猫
10-21 23:42:43.121: W/dalvikvm(1459): threadid=1: thread exiting with uncaught exception (group=0x414c4700)
10-21 23:42:43.141: E/AndroidRuntime(1459): FATAL EXCEPTION: main
10-21 23:42:43.141: E/AndroidRuntime(1459): java.lang.NullPointerException
10-21 23:42:43.141: E/AndroidRuntime(1459): at com.inform.edufindme.task.ValidarUsuarioTask.onPostExecute(ValidarUsuarioTask.java:42)
10-21 23:42:43.141: E/AndroidRuntime(1459): at com.inform.edufindme.task.ValidarUsuarioTask.onPostExecute(ValidarUsuarioTask.java:1)
10-21 23:42:43.141: E/AndroidRuntime(1459): at android.os.AsyncTask.finish(AsyncTask.java:631)
10-21 23:42:43.141: E/AndroidRuntime(1459): at android.os.AsyncTask.access$600(AsyncTask.java:177)
10-21 23:42:43.141: E/AndroidRuntime(1459): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644)
10-21 23:42:43.141: E/AndroidRuntime(1459): at android.os.Handler.dispatchMessage(Handler.java:99)
10-21 23:42:43.141: E/AndroidRuntime(1459): at android.os.Looper.loop(Looper.java:137)
10-21 23:42:43.141: E/AndroidRuntime(1459): at android.app.ActivityThread.main(ActivityThread.java:5103)
10-21 23:42:43.141: E/AndroidRuntime(1459): at java.lang.reflect.Method.invokeNative(Native Method)
10-21 23:42:43.141: E/AndroidRuntime(1459): at java.lang.reflect.Method.invoke(Method.java:525)
10-21 23:42:43.141: E/AndroidRuntime(1459): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
10-21 23:42:43.141: E/AndroidRuntime(1459): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
10-21 23:42:43.141: E/AndroidRuntime(1459): at dalvik.system.NativeStart.main(Native Method)