Android如何http获取数据库数据

移动开发 waitig 598℃ 百度已收录 0评论

以登录为例

import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import com.pets.main.BaseApp;
import com.pets.main.MainActivity;
import com.pets.main.R;
import com.pets.utils.DialogUtil;
import com.pets.utils.JSONParser;

import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONObject;

import java.util.ArrayList;
import java.util.List;

@SuppressWarnings("deprecation")
public class LoginActivity extends Activity {
    // Progress Dialog
    private ProgressDialog pDialogl;
    JSONParser jsonParser = new JSONParser();
    EditText inputLogName;
    EditText inputLogPassword;
    String username0,password0;
    boolean available;

    private static String url_up = "http://localhost/login.php";
    private static final String TAG_MESSAGE = "message";
    private static final String TAG_SUCCESS = "success";
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);// 不显示程序的标题栏  
        setContentView(R.layout.activity_login);
        // Edit Text
        inputLogName = (EditText) findViewById(R.id.username);
        inputLogPassword = (EditText) findViewById(R.id.password);          

        // Create button
        Button btnlogin = (Button) findViewById(R.id.button_login);
        // button click event
        /**
         * 首先检查网络连接状况,testConnectivityManager();
         */
        testConnectivityManager();
        if(available){
            btnlogin.setOnClickListener(new View.OnClickListener() {

                public void onClick(View view) {
                    // creating new product in background thread
                    username0 = inputLogName.getText().toString();
                    password0 = inputLogPassword.getText().toString();
                    if(validate()&&validate1()){

                        /**
                         * 开启异步进程,进行数据传输
                         */
                        new Up().execute();
                    }
                }
            });
        }
        Button to_regist=(Button)findViewById(R.id.button_to_regist);
        to_regist.setOnClickListener(new OnClickListener() {            
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                startActivity(new Intent(LoginActivity.this,RegistActivity.class));         
            }
        });
    }
    private boolean validate(){
        String user = inputLogName.getText().toString().trim();
        if (user.equals("")){
            DialogUtil.showDialog(this, "用户名不能为空", false);
            return false;
        }      
        return true;
    }
    private boolean validate1(){
        String user = inputLogPassword.getText().toString().trim();
        if (user.equals("")){
            DialogUtil.showDialog(this, "密码不能为空", false);
            return false;
        }     
        return true;
    }

    public void testConnectivityManager() {
        ConnectivityManager connManager = (ConnectivityManager) this
                .getSystemService(CONNECTIVITY_SERVICE);
        // 获取代表联网状态的NetWorkInfo对象
        NetworkInfo networkInfo = connManager.getActiveNetworkInfo();
        // 获取当前的网络连接是否可用
        available = networkInfo.isAvailable();
        if(available){
            Log.i("通知", "当前的网络连接可用");
        }
        else{
            Log.i("通知", "当前的网络连接不可用");
        }
    }
    /**
     * 在后台运行的异步进程,进行数据交互
     * */
    class Up extends AsyncTask<String, String, String> {
        /**
         * 在后台进程开始之前,显示 dialog
         * */
        @Override
        protected void onPreExecute() {//异步进程
            super.onPreExecute(); 
            /**
             * pDialogl是进度条会话框
             * 显示进度会话框
             */
            pDialogl = new ProgressDialog(LoginActivity.this);
            pDialogl.setMessage("...登录中...");
            pDialogl.setIndeterminate(false);
            pDialogl.setCancelable(true);
            pDialogl.show();
        }

        /**
         * Creating product
         * */
        protected String doInBackground(String... args) {

            // Building Parameters
            List<NameValuePair> params1 = new ArrayList<NameValuePair>();
            params1.add(new BasicNameValuePair("username", username0));
            params1.add(new BasicNameValuePair("password", password0));

            // getting JSON Object
            // Note that create product url accepts POST method
            System.out.println("request php json");
           try{
            JSONObject json = jsonParser.makeHttpRequest(url_up, "POST", params1);
            System.out.println("exit php json");

            String message = json.getString(TAG_MESSAGE);
            String  suce=json.getString(TAG_SUCCESS);

            System.out.println("get message "+message+"  "+suce);
            System.out.println("it was not run! ");

            if(suce.equals("1")){
                Intent intent=new Intent(LoginActivity.this,MainActivity.class);
                BaseApp.setUser(username0);
                BaseApp.setState("1");
                startActivity(intent);              
            }
            return message;
           }catch(Exception e){
               e.printStackTrace(); 
               return "";          
           }
            // check for success tag 
        }
        /**
         * After completing background task Dismiss the progress dialog
         * **/
        @SuppressLint("ShowToast")
        protected void onPostExecute(String message) {                    
            pDialogl.dismiss();
           //message 为接收doInbackground的返回值
            System.out.println("onPostExecute"+message);
            Toast.makeText(getApplicationContext(), message, Toast.LENGTH_SHORT).show();
        }
     }
}

Json处理

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.List;
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.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.protocol.HTTP;
import org.json.JSONException;
import org.json.JSONObject;
import android.util.Log;

@SuppressWarnings("deprecation")
public class JSONParser {

    static InputStream is = null;
    static JSONObject jObj = null;
    static String json = "";
    // constructor
    public JSONParser() {
    }
    // function get json from url
    // by making HTTP POST 
    public JSONObject makeHttpRequest(String url, String method, List<NameValuePair> params) {
        // Making HTTP request
        try {    
                // request method is POST
                // defaultHttpClient
                DefaultHttpClient httpClient = new DefaultHttpClient();
                HttpPost httpPost = new HttpPost(url);
                httpPost.setEntity(new UrlEncodedFormEntity(params,HTTP.UTF_8));
                HttpResponse httpResponse = httpClient.execute(httpPost);
                HttpEntity httpEntity = httpResponse.getEntity();
                is = httpEntity.getContent();                           
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        try {
            BufferedReader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));
            StringBuilder sb = new StringBuilder();
            String line = null;
            while ((line = reader.readLine()) != null) {
                JSONTokener(sb.toString());
                sb.append(line + "\n");
            }
            is.close();
            json = sb.toString();
            System.out.println("makeHttpRequest"+json);
        } catch (Exception e) {
            Log.e("Buffer Error", "Error converting result " + e.toString());
            Log.d("json", json.toString());
        }

        try {
            jObj = new JSONObject(json);
            System.out.println("new json"+json);
        } catch (JSONException e) {
            Log.e("JSON Parser", "Error parsing data " + e.toString());
        }
        // return JSON String
        return jObj;
    }
    private String JSONTokener(String in) {
        // TODO Auto-generated method stub
        if (in != null && in.startsWith("\ufeff")) {  
            in = in.substring(1);  
            }  
            return in;  
    }
}

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