public class MyOpenHelper extends SQLiteOpenHelper{
public static final String CREAT_CONTACTS="create table contactTable(id integer primary key autoincrement,name,email,comp,post,addr,phone,mobile)";
//                                    +"id integer primary key autoincrement,"
//                                    +"name,pwd");
private Context mycContext;public MyOpenHelper(Context context, String name, CursorFactory factory,int version) {super(context, name, factory, version);// TODO Auto-generated constructor stubmycContext=context;}@Overridepublic void onCreate(SQLiteDatabase arg0) {// TODO Auto-generated method stub
        arg0.execSQL(CREAT_CONTACTS);Toast.makeText(mycContext, "数据库创建成功", Toast.LENGTH_LONG).show();}@Overridepublic void onUpgrade(SQLiteDatabase arg0, int arg1, int arg2) {// TODO Auto-generated method stub
        }public Cursor query(String string, String[] args) {// TODO Auto-generated method stubSQLiteDatabase db=this.getReadableDatabase();Cursor cursor=db.rawQuery(string, args);return cursor;}}

public class DetailActivity extends Activity {MyOpenHelper dbhelper;EditText editname;EditText editemail;EditText editcomp;EditText editpost;EditText editaddr;EditText editphone;Bundle bundle;EditText editmobile;ImageButton imbutsave;private String selectname;protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.detail);editname=(EditText)findViewById(R.id.editname);editemail=(EditText)findViewById(R.id.editemail);editcomp=(EditText)findViewById(R.id.editcomp);editpost=(EditText)findViewById(R.id.editpost);editaddr=(EditText)findViewById(R.id.editaddr);editphone=(EditText)findViewById(R.id.editphone);editmobile=(EditText)findViewById(R.id.editmobile);imbutsave=(ImageButton)findViewById(R.id.imageButtonsave);bundle=getIntent().getExtras();dbhelper=new MyOpenHelper(DetailActivity.this, "mycontacts.db",null,1);final SQLiteDatabase db=dbhelper.getReadableDatabase();if(!bundle.getString("name").equals("")){selectname=bundle.getString("name");Cursor cursor = db.rawQuery("select * from contactTable where name=?",new String[]{selectname});cursor.moveToFirst();editname.setText(cursor.getString(cursor.getColumnIndex("name")));editemail.setText(cursor.getString(cursor.getColumnIndex("email")));editcomp.setText(cursor.getString(cursor.getColumnIndex("comp")));editpost.setText(cursor.getString(cursor.getColumnIndex("post")));editaddr.setText(cursor.getString(cursor.getColumnIndex("addr")));editphone.setText(cursor.getString(cursor.getColumnIndex("phone")));editmobile.setText(cursor.getString(cursor.getColumnIndex("mobile")));}registerForContextMenu(editname);imbutsave.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubdbhelper=new MyOpenHelper(DetailActivity.this, "mycontacts.db",null,1);SQLiteDatabase db=dbhelper.getReadableDatabase();ContentValues values = new ContentValues();String nameString=editname.getText().toString();String emailString=editemail.getText().toString();String compString=editcomp.getText().toString();String postString=editpost.getText().toString();String addrString=editaddr.getText().toString();String phoneString=editphone.getText().toString();String mobileString=editmobile.getText().toString();if (!nameString.equals("")){Cursor cursor=db.rawQuery("select * from contactTable where name=?", new String[]{nameString});cursor.moveToFirst();values.put("name",nameString);values.put("email", emailString);values.put("comp", compString);values.put("post", postString);values.put("addr", addrString);values.put("phone", phoneString);values.put("mobile", mobileString);    if (cursor.getCount()<=0) {db.insert("contactTable", null, values);values.clear();Toast.makeText(DetailActivity.this, "联系人"+nameString+"成功保存",Toast.LENGTH_LONG).show();db.delete("contactTable", "name=?", new String[]{selectname});Intent it=new Intent();it.setClass(DetailActivity.this, MainActivity.class);startActivity(it);finish();}else if (cursor.getCount()==1 && cursor.getString(cursor.getColumnIndex("name")).equals(selectname)) {db.update("contactTable", values, "name=?", new String[]{selectname});values.clear();Toast.makeText(DetailActivity.this, "联系人"+nameString+"成功更新",Toast.LENGTH_LONG).show();Intent it=new Intent();it.setClass(DetailActivity.this, MainActivity.class);startActivity(it);finish();}else {Toast.makeText(DetailActivity.this, "姓名已存在",Toast.LENGTH_LONG).show();}}else {Toast.makeText(DetailActivity.this, "姓名不能为空",Toast.LENGTH_LONG).show();}                    }                });}
}

public class MainActivity extends Activity {final int rowcount=0;ListView lv;ImageButton ibutadd;SQLiteDatabase db;MyOpenHelper dbHelper;String[] name=new String[50];@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);ibutadd=(ImageButton)findViewById(R.id.imageButton1);lv=(ListView)findViewById(R.id.listView1);dbHelper = new MyOpenHelper(MainActivity.this, "mycontacts.db",null, 1);final SQLiteDatabase db = dbHelper.getReadableDatabase();Cursor cursor = db.rawQuery("select name from contactTable", null);ibutadd.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubIntent it=new Intent();Bundle bundle=new Bundle();bundle.putString("name", "");it.putExtras(bundle);it.setClass(MainActivity.this, DetailActivity.class);startActivity(it);}});final ArrayList<HashMap<String, Object>> listItem = new ArrayList<HashMap<String, Object>>();/*在数组中存放数据*/cursor.moveToFirst();for(int i=0;i<cursor.getCount();i++)                      {  HashMap<String, Object> map = new HashMap<String, Object>();  map.put("name",cursor.getString(cursor.getColumnIndex("name")));  name[i]=cursor.getString(cursor.getColumnIndex("name"));listItem.add(map);            if(i==cursor.getCount()){break;}cursor.moveToNext();} SimpleAdapter mSimpleAdapter = new SimpleAdapter(this,listItem,//需要绑定的数据                R.layout.line,//每一行的布局//动态数组中的数据源的键对应到定义布局的View中new String[] {"name"},   new int[] {R.id.tv1});lv.setAdapter(mSimpleAdapter);//为ListView绑定适配器lv.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> arg0, View arg1, int arg2,long arg3) {// TODO Auto-generated method stubIntent it=new Intent(MainActivity.this, DetailActivity.class);Bundle bundle=new Bundle();bundle.putString("name", name[arg2]);it.putExtras(bundle);startActivity(it);}});}
@Overridepublic 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;}}