我想用java

顯示項目的一排按鈕到Android XML我想從我的SQL數據庫顯示，象這樣的數據中的每一行我想有一個新的行，如果有顯示的食物它可以向下滾動太多。該行將有一個圖片foodname和一個訂單按鈕。任何人有任何想法做到這一點？我想用java

我在我的數據庫中有三列食物。名稱，描述，價格，imagesrc

SQL數據庫的每一行都會有一個行對象。如果有超過5row超出手機頁面可以滾動下來，我想這樣做：

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2017-08-29 Ow_

到目前爲止，您嘗試了什麼？ – Mandy8055

爲了這個目的，你可以使用RecyclerView，你可以瞭解更多關於它在這裏：https://www.survivingwithandroid.com/2016/09/android-recyclerview-tutorial.html

來源

2017-08-29 10:49:40 Alvaro

1.）創建的主要活動內的列表視圖。和每個列表項目的佈局。

2）創建SQLiteOpenHelper數據庫（在互聯網上這麼多的教程）有變量：

INT的ImageSource，字符串名稱，字符串描述， INT價格，

使用該其他代碼我已經爲我的項目之一創建以供參考：

public class DatabaseHelper extends SQLiteOpenHelper { 

    private static final String DATABASE_NAME = "eventList.db"; 
    public static final String TABLE_NAME = "event_table"; 
    public static final String COL_ID = "_id"; 
    public static final String COL_NAME = "EVENTNAME"; 
    public static final String COL_UNIXTIME = "UNIXTIMESTAMP"; 
    public static final String COL_PARTICIPANTS = "PARTICIPANTS"; 
    public static final String COL_LOCATION = "LOCATION"; 
    public static final String COL_LOCATIONNAME = "LOCATIONNAME"; 
    public static final String COL_SUMMARY = "SUMMARY"; 
    private Context context; 

    private static final String[] ALL_COLUMNS = new String[]{ 
      COL_ID,COL_NAME,COL_UNIXTIME,COL_PARTICIPANTS,COL_LOCATION,COL_LOCATIONNAME,COL_SUMMARY 
    }; 

    public DatabaseHelper(Context context) { 
     super(context, DATABASE_NAME, null, 1/**version**/); 
     this.context = context; 
    } 

    @Override 
    public void onCreate(SQLiteDatabase sqLiteDatabase) { 
     String createTable = "CREATE TABLE " + TABLE_NAME + "(" + 
       COL_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + 
       COL_NAME + " TEXT," + 
       COL_UNIXTIME + " INTEGER," + 
       COL_PARTICIPANTS + " INTEGER," + 
       COL_LOCATION + " TEXT," + 
       COL_LOCATIONNAME + " TEXT," + 
       COL_SUMMARY + " TEXT)"; 
     sqLiteDatabase.execSQL(createTable); 

    } 

    @Override 
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
     db.execSQL("DROP IF TABLE EXISTS " + TABLE_NAME); 
     onCreate(db); 
    } 

    public boolean addData(String event_name, long unixtime, int participants, LatLng location, String locationName,String summary){ 
     SQLiteDatabase db = this.getWritableDatabase(); 
     ContentValues contentValues = new ContentValues(); 

     Gson gson = new Gson(); 

     String gsonLocation = gson.toJson(location,LatLng.class); 

     contentValues.put(COL_NAME,event_name); 
     contentValues.put(COL_UNIXTIME, unixtime); 
     contentValues.put(COL_PARTICIPANTS, participants); 
     contentValues.put(COL_LOCATION, gsonLocation); 
     contentValues.put(COL_LOCATIONNAME, locationName); 
     contentValues.put(COL_SUMMARY, summary); 

     long result = db.insert(TABLE_NAME, null, contentValues); 
     if(result == -1){ 
      return false; 
     }else{ 
      return true; 
     } 

    } 
    public Cursor getAllEvents(){ 
     SQLiteDatabase db = this.getReadableDatabase(); 

     String where = null; 

     Cursor c = db.query(true, TABLE_NAME, ALL_COLUMNS,where,null,null,null,/** COL_NAME + " ASC"**/null,null); 
     return c; 

    }

3）創建一個CursorAdapter（再次，這麼多的在線教程）：僅供參考使用地雷：

public class EventListCursorAdapter extends CursorAdapter { 

    private LayoutInflater cursorInflater; 
    Calculations calculations = new Calculations(); 
    Gson gson = new Gson(); 
    Context AppContext; 

    public EventListCursorAdapter(Context context, Cursor c, int flags) { 
     super(context, c, flags); 
     cursorInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 

     AppContext = context.getApplicationContext(); 
    } 

    @Override 
    public View newView(Context context, Cursor cursor, ViewGroup parent) { 
     return cursorInflater.inflate(R.layout.card_view, parent, false); 
    } 

    @Override 
    public void bindView(View view, Context context, Cursor cursor) { 
     TextView timeText = (TextView) view.findViewById(R.id.event_time); 
     TextView nameText = (TextView) view.findViewById(R.id.event_name); 
     TextView dateText = (TextView) view.findViewById(R.id.event_date); 
     TextView summaryText = (TextView) view.findViewById(R.id.event_summary); 
     TextView participantsText = (TextView) view.findViewById(R.id.event_participantNum); 
     TextView locationText = (TextView) view.findViewById(R.id.event_location); 

     final Cursor mCursor = cursor; 

     String date = calculations.UnixTimeConverter(
       mCursor.getLong(mCursor.getColumnIndex(DatabaseHelper.COL_UNIXTIME) 
     ))[0]; 
     String time = calculations.UnixTimeConverter(
       mCursor.getLong(mCursor.getColumnIndex(DatabaseHelper.COL_UNIXTIME)) 
     )[1]; 
     final LatLng location = gson.fromJson(mCursor.getString(mCursor.getColumnIndex(DatabaseHelper.COL_LOCATION)),LatLng.class); 

     nameText.setText(mCursor.getString(mCursor.getColumnIndex(DatabaseHelper.COL_NAME))); 
     dateText.setText(date); 
     timeText.setText(time); 
     participantsText.setText(mCursor.getInt(mCursor.getColumnIndex(DatabaseHelper.COL_PARTICIPANTS))+""); 
     summaryText.setText(mCursor.getString(mCursor.getColumnIndex(DatabaseHelper.COL_SUMMARY))); 
     locationText.setText(mCursor.getString(mCursor.getColumnIndex(DatabaseHelper.COL_LOCATIONNAME))); 

     locationText.setOnClickListener(new View.OnClickListener(){ 
      @Override 
      public void onClick(View v) { 
       final CameraPosition camLocation = CameraPosition.builder(). 
         target(location).zoom(18).build(); 
       MainActivity.mMap.animateCamera(CameraUpdateFactory.newCameraPosition(camLocation)); 
      } 
     }); 

     summaryText.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       LayoutInflater mLayoutInflator; 
       mLayoutInflator = LayoutInflater.from(AppContext); 
       final AlertDialog.Builder mBuilder = new AlertDialog.Builder(mContext); 
       View mView = mLayoutInflator.inflate(R.layout.summarydialog,null); 
       TextView textView = mView.findViewById(R.id.mainText); 
       textView.setText(
         mCursor.getString(mCursor.getColumnIndex(DatabaseHelper.COL_SUMMARY)) 
       ); 

       textView.setMovementMethod(new ScrollingMovementMethod()); 

       mBuilder.setView(mView); 
       final AlertDialog dialog = mBuilder.create(); 
       dialog.show(); 
      } 
     }); 

    } 
}

請注意，您必須實現bindView和NewView的方法，並且必須創建一個構造函數，調用父類

最後，在你的主類，你「 attatch」 CursorAdapter的到ListView：

使用我的代碼以供參考：

final ListView contanctListView = (ListView) findViewById(R.id.contactListView); 
     final ContactsDatabaseHelper contactManager = new ContactsDatabaseHelper(context); 

       contactListCursor = contactManager.getAllContacts(); 
       customAdapter = new ContactListCursorAdapter(
         ContactActivity.this, 
         contactListCursor, 
         0); 

       contanctListView.setAdapter(customAdapter);

注意，在我的情況下，ID爲listview was eventlistview and for each card item，it was card_view.xml

來源

2017-08-29 10:59:24

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