Question

我正在尝试使用json和GET请求在Android应用程序中执行简单的登录过程我从主活动中获取用户名和密码然后将其传递给登录类，该登录类是Async的子类，用于登录操作etablich 之后我开始创建一个名为Profile的新Activity，我将显示一些数据，但它不能用于我的代码：

package com.example.socialnetcit;

import java.io.IOException;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.*;
import android.view.View.OnClickListener;
import android.widget.*;

public class Login extends Activity {

    Tools tools = new Tools();
    EditText edtname;
    EditText edtpass;
    String name;
    String pass;

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);

        Button loginBtn = (Button) findViewById(R.id.button1);
        loginBtn.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {

                edtname = (EditText) findViewById(R.id.editText1);
                edtpass = (EditText) findViewById(R.id.editText2);
                name = edtname.getText().toString();
                pass = edtpass.getText().toString();
                if (tools.isEmpty(edtname) || tools.isEmpty(edtpass))

                {
                    Toast.makeText(getApplicationContext(),
                            "Plz enter user name and password",
                            Toast.LENGTH_LONG).show();
                } else {
                    String url = "http://example.com/Andoid/login.php?"
                            + "name=" + name + "&pass=" + pass;
                    login log = new login();
                    log.execute(url);

                }

            }
        });

    }
////// Login class 

    class login extends AsyncTask<String, Void, Boolean> {

        @Override
        protected Boolean doInBackground(String... params) {
            HttpEntity httpEntity = null;
            JSONObject jsonObj = null;
            Boolean login = false;
            try {
                DefaultHttpClient httpClient = new DefaultHttpClient(); // HttpClient
                HttpGet httpGet = new HttpGet(params[0]);
                HttpResponse httpResponse = httpClient.execute(httpGet);
                httpEntity = httpResponse.getEntity();
            } catch (ClientProtocolException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }

            // Convert HttpEntity into JSON Array

            if (httpEntity != null) {
                try {
                    String entityResponse = EntityUtils.toString(httpEntity);
                    jsonObj = new JSONObject(entityResponse);
                } catch (JSONException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                String tmp = tools.JsonVerify(jsonObj).toString();
                if (tmp.equals("true")) {
                    Log.d("Testy", "login successful");
                    login = true;
                }
            }
            return login;
        }

        @Override
        protected void onPostExecute(Boolean result) {
            super.onPostExecute(result);

            if (result == true) {
                  Intent i=new Intent(Login.this, Profile.class);
                    startActivity(i);
                    finish();
            } else {

                Toast.makeText(getApplicationContext(),
                        "Wrong password or username ", Toast.LENGTH_LONG)
                        .show();

            }
        }

    }
}

关闭当前活动（登录）并返回第一个（登录/注册后选择的主电源）

这是日志数据：

12-17 01:24:11.080: I/ActivityManager(1723): START u0 {cmp=com.example.socialnetcit/.Profile} from pid 6126
12-17 01:24:11.080: D/ActivityManager(1723): TopActivityInfo, pkgName: com.example.socialnetcit activityName: com.example.socialnetcit.Profile  bstSpecialAppKeyboardHandlingEnabled = false
12-17 01:24:11.080: D/ActivityManager(1723): Showing guidance for pkgName: com.example.socialnetcit
12-17 01:24:11.100: D/GuidanceScreen(2000): event === app_launch
12-17 01:24:11.100: D/GuidanceScreen(2000): hiding guidance
12-17 01:24:11.100: D/GuidanceScreen(2000): hardKeyboard = 1
12-17 01:24:11.100: D/GuidanceScreen(2000): controllerType === DualAction
12-17 01:24:11.100: D/GuidanceScreen(2000): appName: SocialNetCIT, currentPkg: com.example.socialnetcit, event: app_launch, controller: DualAction
12-17 01:24:11.100: D/GuidanceScreen(2000): appName: SocialNetCIT
12-17 01:24:11.110: D/GuidanceScreen(2000): no guidance for com.example.socialnetcit.
12-17 01:24:11.620: W/ActivityManager(1723): Activity pause timeout for ActivityRecord{4b0f4214 u0 com.example.socialnetcit/.Login t29}
12-17 01:24:30.820: D/dalvikvm(1970): GC_FOR_ALLOC freed 761K, 30% free 2770K/3936K, paused 10ms, total 10ms
12-17 01:25:26.400: D/dalvikvm(2410): GC_FOR_ALLOC freed 777K, 29% free 2809K/3936K, paused 0ms, total 0ms
12-17 01:25:30.930: D/dalvikvm(1970): GC_FOR_ALLOC freed 765K, 31% free 2753K/3936K, paused 0ms, total 0ms

执行后：

 Intent i=new Intent(Login.this, Profile.class);
                            startActivity(i);
                            finish();

Answer 1

它会关闭Login活动，因为您调用了finish()：

if (result == true) {
   Intent i=new Intent(Login.this, Profile.class);
   startActivity(i);
   finish();
}

根据您的评论，听起来您希望看到个人资料活动，但您会看到主要活动。您应该查看个人资料活动，看看它为什么要完成。

在Asynctask中开始一项活动

1 个答案: