Question

我有一个用db行数据填充的ListView。然后我打开一个与用于创建/新行的原始页面相同的intent。我想重新使用它来编辑/更新。我试图将整个行数据集合到新的编辑活动中，以便可以对其进行操作，然后更新行。请注意，没有使用ListActivities，我不打算去那条路线。计划中还有一个删除和取消，但我现在很高兴让更新工作。

插入类具有：

        @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        if(v==submitButton){
            String name = nameEditText.getText().toString();
            String location = locationEditText.getText().toString();
            String notes = notesEditText.getText().toString();

            long insert = db.insertRecord(name, location, retn, nh, busy, child, man, woman, notes);
        Toast.makeText(getApplicationContext(), "Record inserted successfully", Toast.LENGTH_SHORT).show();
            db.close();
            finish();

        startActivity(new Intent(getApplicationContext(), MainActivity.class));


        }else if(v==cancelButton){
            startActivity(new Intent(getApplicationContext(), MainActivity.class));
             }else yada, yada, yada...

具有ListView的类：

    public class ViewRecords extends Activity implements OnItemLongClickListener, OnClickListener {
private static final String TAG = null;
int position;
Dialog updateDialog;
EditText updatename,updatelocation;
Button updateButton,cancelButton;
DBAdapter db;
Cursor c;
ListView list;
MyAdapter myAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.view);
    db = new DBAdapter(getApplicationContext());
    db.openDatabase();


    list = (ListView)findViewById(R.id.listView1);
     updateListView();

    list.setOnItemLongClickListener(new OnItemLongClickListener() {
          @Override
          public boolean onItemLongClick(AdapterView<?> list, View customlistView,
            int position, long id) {
            Toast.makeText(getApplicationContext(),
              "ListItem Number " + position + ". id: " + id, Toast.LENGTH_LONG)
              .show();                  
            Intent myIntent = new Intent(ViewRecords.this, Edit.class);
            ViewRecords.this.startActivity(myIntent);

            return true;
          }
        });           
}
class MyAdapter extends BaseAdapter{         
    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return c.getCount();
    }

    @Override
    public Object getItem(int arg0) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public long getItemId(int arg0) {
        // TODO Auto-generated method stub
        return 0;
    }

...和编辑类：

      public class Edit extends Activity{  // implements OnClickListener{
      EditText nameEditText,locationEditText, notesEditText;
      DBAdapter db;
      CheckBox cb1, cb2, cb3, cb4, cb5, cb6;
      @Override
      protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.insert);

那么，任何人都可以建议我如何从这里到达那里吗？谢谢！

编辑：下面的适配器。

        public class DBAdapter {
    // database name
        public static final String DATABASE_NAME = "UserDB";
    // table name
        public static final String TABLE_NAME = "tableone";
    // database version
        public static final int DATABASE_VERSION = 1;
    // defining columns
        public static final String COL_ROWID = "rowid";
        public static final String COL_NAME = "name";
        public static final String COL_LOCATION = "location";
        public static final String COL_RETURN = "retn";    
        public static final String COL_NH = "nh";
        public static final String COL_BUSY = "busy";
        public static final String COL_CHILD = "child";
        public static final String COL_MAN = "man";
        public static final String COL_WOMAN = "woman";
        public static final String COL_NOTES = "notes";

        String CREATE_TABLE = "create table tableone(rowid integer primary key autoincrement,name text,location text not null, retn text, nh text, busy text, child text, man text, woman text, notes text)";

        Context context;

        DBHelper dbHelper;
        SQLiteDatabase db; 
        public DBAdapter(Context c) {
        // TODO Auto-generated constructor stub
        this.context = c;
        dbHelper = new DBHelper(context);
        }

        DBAdapter openDatabase() {
            db = dbHelper.getWritableDatabase();
            return this;

        }

        void close() {
            dbHelper.close();
        }

        long insertRecord(String name, String location, String retn, String nh, String busy, String child, String man, String woman, String notes) {
            ContentValues con = new ContentValues();
            con.put(COL_NAME, name);
            con.put(COL_LOCATION, location);
            con.put(COL_RETURN, retn);
            con.put(COL_NH, nh);
            con.put(COL_BUSY, busy);
            con.put(COL_CHILD, child);
            con.put(COL_MAN, man);
            con.put(COL_WOMAN, woman);
            con.put(COL_NOTES, notes);

            return db.insert(TABLE_NAME, null, con);
        }

        Cursor getAllRecords(){
            String[] columns = {COL_ROWID,COL_NAME,COL_LOCATION, COL_RETURN, COL_NH, COL_BUSY, COL_CHILD, COL_MAN, COL_WOMAN, COL_NOTES};
            return db.query(TABLE_NAME, columns, null, null, null, null, null);
         }

        void deleteAllRecords(){
            db.delete(TABLE_NAME, null, null);
         }

        void deleteOneRecord(String rowid){
            db.delete(TABLE_NAME, rowid +"="+COL_ROWID, null);
         }

        long updateRecord(String rowid,String name,String location, String retn, String nh, String busy, String child, String man, String woman, String notes){
            ContentValues con = new ContentValues();
            con.put(COL_NAME, name);
            con.put(COL_LOCATION, location);
            con.put(COL_NH, nh);
            con.put(COL_RETURN, retn);
            con.put(COL_BUSY, busy);
            con.put(COL_CHILD, child);
            con.put(COL_MAN, man);
            con.put(COL_WOMAN, woman);
            con.put(COL_NOTES, notes);        

            return db.update(TABLE_NAME, con, rowid +"="+COL_ROWID, null);
         }

    class DBHelper extends SQLiteOpenHelper {
        public DBHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
        // TODO Auto-generated constructor stub
        }

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

        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // TODO Auto-generated method stub
        }
      }

}

Answer 1

而不是从行中获取整个数据，更好的解决方案是获取被单击的行的id然后将您的意图中的包中的id传递给您的活动，然后从您的{中的意图中提取id {1}}活动并从具有该ID的该行的数据库中提取所有内容。

你没有真正展示你如何使用你的适配器，所以我真的不能告诉你更多，但如果你想传递整个数据，你要么必须传递你想要发送的每个值分开; y在意图中或创建一个保存数据并使该类扩展Edit并将该类配置为Parcelable对象的对象

从listview获取数据库行数据，填充活动的小部件，然后更新行

1 个答案: