数据库代码：

package com.example.brdemo;import android.app.Activity;import android.content.Intent;import android.database.Cursor;import android.database.sqlite.SQLiteDatabase;import android.database.sqlite.SQLiteException;import android.net.Uri;import android.os.Bundle;import android.support.v4.widget.CursorAdapter;import android.support.v4.widget.SimpleCursorAdapter;import android.view.Menu;import android.view.MenuInflater;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.Toast;public class MainActivity extends Activity {    private Button btn1,btn2,btn3;    private EditText edname,edsecret;    Intent iguangs, iches;    SQLiteDatabase db;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        btn1 = (Button) findViewById(R.id.b1);// 注册        btn2 = (Button) findViewById(R.id.bt3);// 测试        btn3 = (Button) findViewById(R.id.b2);// 登录        edname = (EditText) findViewById(R.id.editname);        edsecret = (EditText) findViewById(R.id.editsecret);              db=SQLiteDatabase.openOrCreateDatabase(this.getFilesDir().toString()+"/mydb.db3", null);        // 注册        btn1.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View arg0) {                String title,content;                 title=edname.getText().toString();                 content=edsecret.getText().toString();                try {                    insertData(db, title, content);                    Cursor cursor=db.rawQuery("select * from myTable", null);                    inflateList(cursor);                } catch (SQLiteException e) {                    // TODO: handle exception                    db.execSQL("create table myTable(_id integer"                            +"primary key autonicrement,"                            +"title varchar(50),"                            + "content varchar(255))");                    insertData(db, title, content);                    Cursor cursor=db.rawQuery("select * from myTable", null);                    inflateList(cursor);                }                Toast.makeText(MainActivity.this, "用户"+edname.getText() +"注册成功", Toast.LENGTH_LONG).show();                iguangs = new Intent();                Bundle bundle = new Bundle();                iguangs.setClass(MainActivity.this, H.class);                bundle.putString("userName", edname.getText().toString());                bundle.putString("phoneNum", edsecret.getText().toString());                iguangs.putExtras(bundle);                // 启动Activity                startActivity(iguangs);            }            private void inflateList(Cursor cursor) {                // TODO Auto-generated method stub                            }            private void insertData(SQLiteDatabase db, String title,                    String content) {                // TODO Auto-generated method stub                            }        });        // 测试        btn2.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View arg0) {                // TODO Auto-generated method stub                Uri uri = Uri.parse("http://open.taobao.com");                 iches = new Intent(Intent.ACTION_VIEW, uri);                startActivity(iches);            }        });        // 登录        btn3.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View arg0) {                iguangs = new Intent();                Bundle bundle = new Bundle();                iguangs.setClass(MainActivity.this, H.class);                bundle.putString("userName", edname.getText().toString());                bundle.putString("phoneNum", edsecret.getText().toString());                                Toast.makeText(MainActivity.this, "用户"+edname.getText() +"登录成功", Toast.LENGTH_LONG).show();                iguangs.putExtras(bundle);                // 启动Activity                startActivity(iguangs);            }        });    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // TODO Auto-generated method stub        MenuInflater inflater = new MenuInflater(this);        inflater.inflate(R.menu.main, menu);        return super.onCreateOptionsMenu(menu);    }private void insertData(SQLiteDatabase db,String title,String content) {    db.execSQL("insert into myTable values(null,?,?)",new String[]{title,content});}private void inflateList(Cursor cursor) {    SimpleCursorAdapter simpleCursorAdapter=new SimpleCursorAdapter(MainActivity.this,            R.layout.activity_main, cursor, new String[]{"title","content"},             new int[]{R.id.editname,R.id.editsecret}, CursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER);     }@Override    protected void onDestroy() {        // TODO Auto-generated method stub        super.onDestroy();        if (db!=null &&db.isOpen()) {            db.close();        }}}