我正在创建一个运行 Windows 服务的简单系统，并带有一个用户表，并且我想通过向该服务发送一些东西来验证某人的登录凭据。我正在尝试发送他们的用户名和密码，但我的异步任务一直出错。我知道你不应该在里面乱用 UI 的东西，而我不是。最初我打电话给那里的另一个活动，但我评论了它。现在 doInBackground 中唯一的事情是如果验证良好，则将布尔值设置为 true。在异步执行后，我从那里读取值，然后将一个包放在一起移动到下一个地方。我只是不知道这里出了什么问题。自从我在 Android 中编程以来已经有一段时间了，所以也许我错过了一些愚蠢的东西。如果有人可以帮助我，我将不胜感激！谢谢你。这也可能是向服务发送信息的问题？
更新：在清单中添加互联网使用情况后，如果我的 doInBackground 中的程序中有 log.d，它会打印出来。如果我没有它，结果值将保持为假。看来我的服务和android应用程序之间的连接存在一些问题...
import java.util.ArrayList;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class LoginActivity extends Activity {
private static final int DATA_FROM_MAIN_ACTIVITY = 1;
private static final String SERVICEURL = "http://localhost:56638/ClientService.svc";
private EditText userTextBox, passTextBox;
private Button loginButton;
private String uName, pass;
private Boolean result = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
userTextBox = (EditText) findViewById(R.id.userTextBox);
passTextBox = (EditText) findViewById(R.id.passTextBox);
loginButton = (Button) findViewById(R.id.loginButton);
loginButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
uName = userTextBox.getText().toString();
pass = passTextBox.getText().toString();
SendLoginMessage task = new SendLoginMessage();
task.execute(uName, pass);
if (result.equals(true)) {
Intent goToMainScreen = new Intent(getApplicationContext(),
MainActivity.class);
goToMainScreen.putExtra("username", uName);
goToMainScreen.putExtra("password", pass);
startActivityForResult(goToMainScreen,
DATA_FROM_MAIN_ACTIVITY);
} else {
Toast.makeText(
getApplicationContext(),
"There was an issue with your username or password.",
Toast.LENGTH_LONG).show();
}
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
private class SendLoginMessage extends AsyncTask<String, String, Void> {
@Override
protected void onPreExecute() {
// Log.d("message almost at server, " + textFromArea, selected,
// null);
}
@Override
protected Void doInBackground(String... names) {
ArrayList<NameValuePair> postParams = new ArrayList<NameValuePair>();
postParams.add(new BasicNameValuePair("username", names[0]));
postParams.add(new BasicNameValuePair("password", names[1]));
String response = null;
try {
response = HttpClient.executeHttpPost(SERVICEURL, postParams);
String newResponse = response.toString();
newResponse = newResponse.replaceAll("\\s+", "");
// if user was authenticated...
if (newResponse.equals(true)) {
result = true;
// creating an intent to take user to next page.
// load their DB objects on the
// on create in other activity
// pass the username/password to next activity
// then make a request to the server for their database
// objects.
// Intent goToMainScreen = new
// Intent(getApplicationContext(), MainActivity.class);
// goToMainScreen.putExtra("username", names[0]);
// goToMainScreen.putExtra("password", names[1]);
// startActivityForResult(goToMainScreen,
// DATA_FROM_MAIN_ACTIVITY);
}
} catch (Exception e) {
Log.d("ERROR", "exception in background");
}
return null;
}
@Override
protected void onPostExecute(Void result) {
// Toast.makeText(getApplicationContext(),
// .show();
}
}
}