Question

我在SQLite中创建了一个数据库，它从包含编辑文本的表单中获取员工信息，我想在另一个活动的列表视图中显示员工的姓名，当我单击一个名称时，我想要我的应用程序在下一个活动中显示完整信息，请帮助我创建列表视图并从数据库中获取名称并使其可单击以打开emloyee的完整信息。

这是代码这是我的InformationDataBase Adapter类

public class InformationDataBaseAdapter {

    public static final String ID_COLUMN = "id";
    public static final String NAME_COLUMN2 = "name";
    public static final String FNAME_COLUMN = "fname";
    public static final String EMPLOYEE_DOB = "dob";
    public static final String EMPLOYEE_INTEREST = "interest";
    public static final String EMPLOYEE_ADDRESS = "address";
    public static final String EMPLOYEE_CONTACT = "contact";

    static final String DATABASE_NAME = "information.db";
    static final String EMPLOYEE_TABLE = "employee";
    static final int DATABASE_VERSION = 1;




    static final String CREATE_EMPLOYEE = "CREATE TABLE "
            + EMPLOYEE_TABLE + " (" + ID_COLUMN + " INTEGER PRIMARY KEY AUTOINCREMENT, "
            + NAME_COLUMN2 + " TEXT NOT NULL, " + FNAME_COLUMN + " TEXT NOT NULL, " + EMPLOYEE_INTEREST + " TEXT, "
            + EMPLOYEE_DOB + " DATE, " + EMPLOYEE_ADDRESS + " TEXT, " + EMPLOYEE_CONTACT + " INTEGER );";


    public SQLiteDatabase db;
    private final Context context;
    private DbHelper dbHelper;

    public InformationDataBaseAdapter(Context _context) {
        context = _context;
        dbHelper = new DbHelper(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    public InformationDataBaseAdapter open() throws SQLException {
        db = dbHelper.getWritableDatabase();
        return this;
    }

    public void close() {
        db.close();
    }

    public SQLiteDatabase getDatabaseInstance() {
        return db;
    }

    public void insertEntry(String Name, String FName, String Interest ,String DOB,String Address,String Contact) {
        ContentValues newValues = new ContentValues();
        newValues.put("NAME", Name);
        newValues.put("Fname", FName);
        newValues.put("Interest", Interest);
        newValues.put("DOB", DOB);
        newValues.put("ADDRESS", Address);
        newValues.put("CONTACT", Contact);

        db.insert("EMPLOYEE_TABLE", null, newValues);

    }

    public int deleteEntry(String Name) {

        String where = "NAME=?";
        int numberOFEntriesDeleted = db.delete("INFORMATION", where,
                new String[] { Name });
        return numberOFEntriesDeleted;
    }

    public String getSinlgeEntry(String Name) {
        Cursor cursor = db.query("EMPLOYEE", null, " NAME=?",
                new String[] { Name }, null, null, null);
        if (cursor.getCount() < 1) // UserName Not Exist
        {
            cursor.close();
            return "NOT EXIST";
        }
        cursor.moveToFirst();
        String info = cursor.getString(cursor.getColumnIndex("INFO"));
        cursor.close();
        return info;
    }

    public void updateEntry(String ID, String Name, String FName, String Interest ,String DOB,String Address,String Contact) {
        ContentValues updatedValues = new ContentValues();

        updatedValues.put("NAME", Name);
        updatedValues.put("Fname", FName);
        updatedValues.put("Interest", Interest);
        updatedValues.put("DOB", DOB);
        updatedValues.put("ADDRESS", Address);
        updatedValues.put("CONTACT", Contact);;

        String where = "NAME = ?";
        db.update("INFORMTION", updatedValues, where, new String[] { Name });
    }
}

这是我的数据库助手类

public class DbHelper扩展了SQLiteOpenHelper {

public DbHelper(Context context, String name, CursorFactory factory,
        int version) {
    super(context, name, factory, version);
    // TODO Auto-generated constructor stub
}

@Override
public void onCreate(SQLiteDatabase db) {
    // TODO Auto-generated method stub
    db.execSQL(LoginDataBaseAdapter.DATABASE_CREATE);
    db.execSQL(InformationDataBaseAdapter.CREATE_EMPLOYEE);
}

@Override
public void onUpgrade(SQLiteDatabase db, int _oldVersion, int _newVersion) {

    // TODO Auto-generated method stub      
    db.execSQL("DROP TABLE IF EXISTS " + "TEMPLATE");
    onCreate(db);
}

}

这是java类信息表单活动

公共类信息扩展活动{

TextView Tv1,Tv2,Tv3,Tv4,Tv5,Tv6,Tv7;
EditText Etname,EtFname,Etinterest,EtDOB,EtAddress,EtContact;
Button Bsubmit;

InformationDataBaseAdapter informationDataBaseAdapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.information);

    informationDataBaseAdapter=new InformationDataBaseAdapter(this);
    informationDataBaseAdapter=informationDataBaseAdapter.open();

    Tv1=(TextView)findViewById(R.id.InfoTV1);
    Tv2=(TextView)findViewById(R.id.InfoTV2);
    Tv3=(TextView)findViewById(R.id.InfoTV3);
    Tv4=(TextView)findViewById(R.id.InfoTV4);
    Tv5=(TextView)findViewById(R.id.InfoTV5);
    Tv6=(TextView)findViewById(R.id.InfoTV6);
    Tv7=(TextView)findViewById(R.id.InfoTV7);
    Etname=(EditText)findViewById(R.id.InfoET1);
    EtFname=(EditText)findViewById(R.id.InfoET2);
    Etinterest=(EditText)findViewById(R.id.InfoET3);
    EtDOB=(EditText)findViewById(R.id.InfoET4);
    EtAddress=(EditText)findViewById(R.id.InfoET5);
    EtContact=(EditText)findViewById(R.id.InfoET6);
    Bsubmit=(Button)findViewById(R.id.bsubmitInfo);

    Bsubmit.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            String Name=Etname.getText().toString();
            String FName=EtFname.getText().toString();
            String Interest=Etinterest.getText().toString();
            String DOB=EtDOB.getText().toString();
            String Address=EtAddress.getText().toString();
            String Contact=EtContact.getText().toString();

            // check if any of the fields are vaccant
            if(Name.equals("")||FName.equals("")||Interest.equals("")||DOB.equals("")||Address.equals("")||Contact.equals(""))
            {

                        AlertDialog.Builder alertBuilder=new AlertDialog.Builder(Information.this);
                        alertBuilder.setTitle("Invalid Data");
                        alertBuilder.setMessage("Please, Enter valid data");
                        alertBuilder.setPositiveButton("Ok", new DialogInterface.OnClickListener() {

                            public void onClick(DialogInterface dialog, int which) {
                                   dialog.cancel();

                            }
                        });
                        alertBuilder.create().show();

            }
            else
            {
                // Save the Data in Database
                informationDataBaseAdapter.insertEntry(Name,FName,Interest,DOB,Address,Contact);
                Toast.makeText(getApplicationContext(), "Information successfully added", Toast.LENGTH_LONG).show();
               Intent i2= new Intent(Information.this,Menu.class);
                startActivity(i2);

            }
        }
    });
}

@Override
protected void onDestroy() {
    // TODO Auto-generated method stub
    super.onDestroy();
    informationDataBaseAdapter.close();
}

@Override
protected void onPause() {
    // TODO Auto-generated method stub
    super.onPause();
    finish();
}

}

Answer 1

这需要很多代码。我想告诉你我对程序结构的看法。无论如何，你必须自己做你想做的事。

在Android中使用数据库应该通过ContentProvider https://developer.android.com/reference/android/content/ContentProvider.html。这是开发人员指南https://developer.android.com/guide/topics/providers/content-provider-basics.html，但我认为，您应该从github下载一些项目，看看它是如何工作的。从此处克隆所有代码https://github.com/bazli/android_packages_apps_AlarmClock/blob/donut/src/com/android/alarmclock/AlarmProvider.java并修改。
要从数据库加载数据，请使用CursorLoader https://developer.android.com/reference/android/content/CursorLoader.html。关于装载机，您可以在这里阅读https://developer.android.com/guide/components/loaders.html。
使用SimpleCursorAdapter https://developer.android.com/reference/android/support/v4/widget/SimpleCursorAdapter.html处理来自数据库的数据并在ListView中显示
我认为，您可以尽早使用片段，因此您只需在用户点击ListView中的某个项目后启动新的活动

希望它有所帮助！祝好运！

如何在SQLite数据库的列表视图中显示单个条目

1 个答案: