如何在simpleadapter中實現OnItemClickListener？代碼刪除，更新等，

我想我只能在MainActivity.java的代碼。但我不知道如何實施OnItemClickListener()。當我在兩個EditTexts中寫入數據並單擊插入按鈕時，它會出現在listView到simpleadapter之間。當我在listView中選擇一行並點擊刪除按鈕時，應該從listView中刪除。我已經編碼「插入」，但我不知道如何編碼刪除，更新，onitemclicklistener。有人知道如何編碼？謝謝。如何在simpleadapter中實現OnItemClickListener？代碼刪除，更新等，

activity_main.xml中

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:orientation="vertical" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    tools:context="com.example.eee.MainActivity"> 

    <LinearLayout 
     android:orientation="horizontal" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content"> 
     <EditText 
      android:id="@+id/eng" 
      android:layout_width="0dp" 
      android:layout_weight="1" 
      android:layout_height="wrap_content" 
      /> 
     <EditText 
      android:id="@+id/kor" 
      android:layout_width="0dp" 
      android:layout_weight="1" 
      android:layout_height="wrap_content" 
      /> 
    </LinearLayout> 
    <LinearLayout 
     android:orientation="horizontal" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content"> 
     <Button 
      android:id="@+id/ins" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="INS" 
      android:onClick="onClick" 
      /> 
     <Button 
      android:id="@+id/del" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="DEL" 
      android:onClick="onClick" 
      /> 
     <Button 
      android:id="@+id/upd" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:text="UPD" 
      android:onClick="onClick" 
      /> 
    </LinearLayout> 
    <ListView 
     android:id="@+id/list" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     /> 
</LinearLayout>

memberlist.xml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="horizontal" android:layout_width="match_parent" 
    android:layout_height="match_parent"> 
    <TextView 
     android:id="@+id/text1" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:padding="10sp" 
     android:textStyle="bold" > 
    </TextView> 
    <TextView 
     android:id="@+id/text2" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:padding="10sp"> 
    </TextView> 
</LinearLayout>

DBAdapter.java

public class DBAdapter { 
    private DatabaseHelper mHelper; 
    private SQLiteDatabase mDb; 

    private static final String DATABASE_NAME = "projectdb"; 
    private static final int DATABASE_VERSION = 1; 
    private static String SQL_TABLE_CREATE; 
    private static String TABLE_NAME; 

    public static final String SQL_CREATE_PROJECT = 
      "create table project (_id integer primary key autoincrement," 
        + " eng text not null," 
        + " kor text not null" 
        + ")"; 

    private final Context mCxt; 

        private static class DatabaseHelper extends SQLiteOpenHelper { 

         public DatabaseHelper(Context context) { 
          super(context, DATABASE_NAME, null, DATABASE_VERSION); 
         } 

         public DatabaseHelper(Context context, String name, 
               SQLiteDatabase.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(SQL_TABLE_CREATE); 
         } 

         @Override 
         public void onOpen(SQLiteDatabase db) { 
          // TODO Auto-generated method stub 
          super.onOpen(db); 
         } 

         @Override 
         public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
          // TODO Auto-generated method stub 
          db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME); 
          onCreate(db); 
         } 
        } 

    public DBAdapter(Context cxt, String sql, String tableName) { 
     this.mCxt = cxt; 
     SQL_TABLE_CREATE = sql; 
     TABLE_NAME = tableName; 
    } 

    public DBAdapter open() throws SQLException { 
     mHelper = new DatabaseHelper(mCxt); 
     mDb = mHelper.getWritableDatabase(); 
     return this; 
    } 

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

    public long insertTable(ContentValues values) { 
     return mDb.insert(TABLE_NAME, null, values); 
    } 

    public boolean deleteTable(String pkColumn, long pkData) { 
     return mDb.delete(TABLE_NAME, pkColumn + "=" + pkData, null) > 0; 
     /*db.delete("memos", "_id=" + memo.getId(), null); 
     db.delete(String table, String whereClause, String[] whereArgs);*/ 
    } 

    public Cursor selectTable(String[] columns, String selection, 
           String[] selectionArgs, String groupBy, 
           String having, String orderBy) { 
     return mDb.query(TABLE_NAME, columns, selection, selectionArgs, groupBy, having, orderBy); 
    } 

    public boolean updateTable(ContentValues values, String pkColumn, long pkData) { 
     return mDb.update(TABLE_NAME, values, pkColumn + "=" + pkData, null) > 0; 
    } 
}

Project.java

public class Project { 
    private long id; 
    private String eng; 
    private String kor; 

    public Project(long id, String eng){ 
     this.id = id; 
     this.eng = eng; 
    } 
    public Project(long id, String eng, String kor) { 
     this.id = id; 
     this.eng = eng; 
     this.kor = kor; 
    } 

    public long getId() { 
     return id; 
    } 

    public String getEng() { 
     return eng; 
    } 

    public String getKor() { 
     return kor; 
    } 
}

MainActivity.java

public class MainActivity extends AppCompatActivity { 
    private Button bt; 
    private EditText et1; 
    private EditText et2; 
    private ListView lv; 
    DBAdapter db; 
    ArrayList<HashMap<String,String>> list; 
    SimpleAdapter sap; 
    Project project; 
    private static final String TAG = "LogTest"; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     bt = (Button)findViewById(R.id.ins); 
     et1 = (EditText)findViewById(R.id.eng); 
     et2 = (EditText)findViewById(R.id.kor); 
     // 
     list = new ArrayList<HashMap<String,String>>(); 
     makeDS(); 

     sap = new SimpleAdapter(this, list, R.layout.memberlist, new String[] {"eng", "kor"}, new int[] {R.id.text1, R.id.text2}); 
     lv.setAdapter(sap); 

     lv.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
      @Override 
      public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
       /*sap.getItem(position); 
       et1.setText(project.getEng()); 
       et2.setText(project.getKor());*/ 
       Log.v(TAG, "list click"); 
      } 
     }); 
     db.close(); 
    } 

    public void makeDS(){ 
     lv = (ListView)findViewById(R.id.list); 
     list.clear(); 
     db = new DBAdapter(this, DBAdapter.SQL_CREATE_PROJECT, "project"); 

     db.open(); 
     String columns[] = {"eng", "kor"}; 
     Cursor cursor = db.selectTable(columns, null, null, null, null, null); 

     if(cursor.moveToFirst()) { 
      do{ 
       HashMap<String,String> map = new HashMap<String,String>(); 
       map.put("eng", cursor.getString(0)); 
       map.put("kor", cursor.getString(1)); 
       list.add(map); 
      }while(cursor.moveToNext()); 
     } 
    } 

    public void onClick(View v) { 
     // TODO Auto-generated method stub 
     // DBAdapter db; 
     switch (v.getId()) { 
      case R.id.ins: 
       String streng = et1.getText().toString(); 
       String strkor = et2.getText().toString(); 

       db = new DBAdapter(this, DBAdapter.SQL_CREATE_PROJECT, "project"); 
       db.open(); 

       ContentValues value = new ContentValues(); 
       value.put("eng", streng); 
       value.put("kor", strkor); 
       db.insertTable(value); 
       break; 

      case R.id.del: 
       db = new DBAdapter(this, DBAdapter.SQL_CREATE_PROJECT, "project"); 
       db.open(); 
       db.deleteTable("_id", project.getId()); 
       Log.v(TAG, "del button click"); 
       break; 
     } 
     makeDS(); 
     sap.notifyDataSetChanged(); 
     db.close(); 
    } 
}

來源

2016-12-02 Hyewon Joo

首先聲明ListView中的按鈕，所以當你點擊刪除，應用程序會刪除你要刪除的對象，否則它不知道你想要刪除的列表視圖中的哪個對象其次，你應該在SimpleAdapter構造函數中實現OnAttributeListener，如下所示：

sap = new SimpleAdapter(this, list, R.layout.memberlist, new String[] {"eng", "kor"}, new int[] {R.id.text1, R.id.text2}) { 

         @Override 
         public View getView(final int position, View convertView, 
              ViewGroup parent) { 
          ViewGroup layout = (ViewGroup) super.getView(position, 
            convertView, parent); 
          delete = (Button) layout.findViewById(R.id.delete_button); 
          edit = (Button) layout.findViewById(R.id.edit_button); 

          delete.setTag(position); 
          edit.setTag(position); 
          delete.setOnClickListener(new View.OnClickListener() { 

           @Override 
           public void onClick(View v) { 
            list.remove(position); 
            notifyDataSetChanged(); 

           } 
          }); 
          edit.setOnClickListener(new View.OnClickListener() { 
           @Override 
           public void onClick(View view) { 
            //do smth 
           } 

          }); 

         return layout; 
} 
};

，然後設置你的適配器

來源

2016-12-02 05:39:27 Sanzhar

data.remove（位置）;我可以問一下那裏的數據是什麼意思嗎？ –

你應該使用列表而不是數據 – Sanzhar

我更新了我的答案，我想你有點困惑 – Sanzhar

請更改

new String[] {"eng", "kor"} to String[] tmpdata= {"eng", "kor"}; 
sap = new SimpleAdapter(this, list, R.layout.memberlist, tmpdata, new int[] {R.id.text1, R.id.text2});

現在listview.onItemClickListener

et1.setText(tmpData[0]); 
      et2.setTexttmpdata[1]);

來源

2016-12-02 05:40:55

如何在simpleadapter中實現OnItemClickListener？代碼刪除，更新等，

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