android问题\新手连接MySQL数据库时候出现 E/dalvikvm(2441): Could not find class....

shizheng163 2017-03-05 08:34:43

package com.example.test1;



import java.sql.DriverManager;

import java.sql.SQLException;



import javax.naming.*;

import com.mysql.jdbc.Connection;



import android.support.v7.app.ActionBarActivity;

import android.support.v7.app.ActionBar;

import android.support.v4.app.Fragment;

import android.app.AlertDialog;

import android.os.Bundle;

import android.view.LayoutInflater;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.view.View.OnClickListener;

import android.view.ViewGroup;

import android.widget.Button;

import android.os.Build;



public class MainActivity extends ActionBarActivity {



    

    protected Button btn;

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        btn=(Button)findViewById(R.id.button1);

        btn.setOnClickListener(new OnClickListener() {

			

			@Override

			public void onClick(View arg0) {

				   try {

					Class.forName("com.mysql.jdbc.Driver");

				} catch (ClassNotFoundException e) {

					// TODO Auto-generated catch block

					e.printStackTrace();

				}

				   String url="jdbc:mysql://localhost:3306/wms?user=root&password=123456&useUnicode=true&characterEncoding=UTF-8";//链接数据库语句

				   try {

					Connection con=(Connection)DriverManager.getConnection(url);

				} catch (SQLException e) {

					new AlertDialog.Builder(MainActivity.this).setTitle("1")//设置对话框标题  

					   .show();

					// TODO Auto-generated catch block

					e.printStackTrace();

				}

				   

				// TODO Auto-generated method stub

				

			}

		});



        if (savedInstanceState == null) {

            getSupportFragmentManager().beginTransaction()

                    .add(R.id.container, new PlaceholderFragment())

                    .commit();

        }

    }





    @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;

    }



    @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();

        if (id == R.id.action_settings) {

            return true;

        }

        return super.onOptionsItemSelected(item);

    }



    /**

     * A placeholder fragment containing a simple view.

     */

    public static class PlaceholderFragment extends Fragment {



        public PlaceholderFragment() {

        }



        @Override

        public View onCreateView(LayoutInflater inflater, ViewGroup container,

                Bundle savedInstanceState) {

            View rootView = inflater.inflate(R.layout.fragment_main, container, false);

            return rootView;

        }

    }



}

03-05 19:55:38.039: E/dalvikvm(2441): Could not find class 'javax.naming.StringRefAddr', referenced from method com.mysql.jdbc.ConnectionPropertiesImpl$ConnectionProperty.storeTo

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