製作一個動態的ListView點擊來改變活動

Question

我的android應用程序當前使用sqlite表的內容填充ListView（在MainActivity中）。我希望能夠單擊其中一個創建的ListView項目，並將其活動更改爲我的EditNote活動，但也會將與該ListView相關的數據庫記錄傳遞到EditNote，並填充EditTexts。

我的MainActivity是填充在加載的ListView：

public class DatabaseHelper { 

    private static final String DATABASE_NAME = "noteDatabase"; 
    private static final int DATABASE_VERSION = 1; 
    private static final String TABLE_NAME = "note"; 

    private OpenHelper mDbHelper; 
    private SQLiteDatabase mDb; 
    private final Context dbContext; 

    private static final String DATABASE_CREATE = 
         "CREATE TABLE " + TABLE_NAME + " (" + 
         "_id INTEGER PRIMARY KEY AUTOINCREMENT, " + 
         "title TEXT NOT NULL, " + 
         "note TEXT NOT NULL); "; 


    public DatabaseHelper(Context ctx) { 

     this.dbContext = ctx; 

    } 

    public DatabaseHelper open() throws SQLException { 
     mDbHelper = new OpenHelper(dbContext); 
     mDb = mDbHelper.getWritableDatabase(); 
     return this; 
    } 

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

    public boolean createNote(String title, String note) { 
     ContentValues initialValues = new ContentValues(); 
     initialValues.put("title", title); 
     initialValues.put("note", note); 

     return mDb.insert(TABLE_NAME, null, initialValues) > 0; 
    } 

    public boolean updateNote(long rowId, String title, String note) { 

     ContentValues args = new ContentValues(); 

     args.put("title", title); 
     args.put("note", note); 

     return mDb.update(TABLE_NAME, args, "_id=" + rowId, null) > 0; 
    } 

    public void deleteAll() { 
     mDb.delete(TABLE_NAME, null, null); 
    } 

    public void deleteRecord(long rowID) { 
     mDb.delete(TABLE_NAME, "_rowId=" + rowID, null); 
    } 

    public ArrayList<String[]> fetchNotes(String title) throws SQLException { 

     ArrayList<String[]> myArray = new ArrayList<String[]>(); 

     int pointer = 0;  

     Cursor mCursor = mDb.query(TABLE_NAME, new String[] {"_id", "title", 
       "note"}, null, null, 
        null, null, "_id"); 

     int titleColumn = mCursor.getColumnIndex("title"); 
     int noteColumn = mCursor.getColumnIndex("note");  

     if (mCursor != null){ 

      if (mCursor.moveToFirst()){ 

       do { 
        myArray.add(new String[3]); 

        myArray.get(pointer)[0] = mCursor.getString(titleColumn); 
        myArray.get(pointer)[1] = mCursor.getString(noteColumn); 
        //increment our pointer variable. 
        pointer++; 
       } while (mCursor.moveToNext()); // If possible move to the next record 
      } else { 

       myArray.add(new String[3]); 
       myArray.get(pointer)[0] = "NO RESULTS"; 
       myArray.get(pointer)[1] = ""; 
      } 
     } 

     return myArray; 

    } 

    public ArrayList<String[]> selectAll() { 

     ArrayList<String[]> results = new ArrayList<String[]>(); 

     int counter = 0; 

     Cursor cursor = this.mDb.query(TABLE_NAME, new String[] { "id", "forename", "surname", "age" }, null, null, null, null, "surname desc"); 

     if (cursor.moveToFirst()) { 
     do { 
      results.add(new String[3]); 
      results.get(counter)[0] = cursor.getString(0).toString(); 
      results.get(counter)[1] = cursor.getString(1).toString(); 
      results.get(counter)[2] = cursor.getString(2).toString(); 
      results.get(counter)[3] = cursor.getString(3).toString(); 
      counter++; 
      } while (cursor.moveToNext()); 
     } 
     if (cursor != null && !cursor.isClosed()) { 
      cursor.close(); 
     } 

     return results; 
    } 

    private static class OpenHelper extends SQLiteOpenHelper { 

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

     @Override 
     public void onCreate(SQLiteDatabase db) { 
      db.execSQL(DATABASE_CREATE); 
     } 

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

我的列表視圖XML（activity_main.xml中內）：用於創建表和SELECT語句

public class MainActivity extends ListActivity{ 


    DatabaseHelper dbh; 
    ArrayList<String> listItems = new ArrayList<String>(); 
    ArrayAdapter<String> adapter; 

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

     dbh = new DatabaseHelper(this); 
      dbh.open(); 

      adapter = new ArrayAdapter<String> (this, android.R.layout.simple_list_item_1, listItems); 

      setListAdapter(adapter); 

      ArrayList<String[]> searchResult = new ArrayList<String[]>(); 

      //EditText searchTitle = (EditText) findViewById(R.id.searchC); 

      listItems.clear(); 

      searchResult = dbh.fetchNotes(""); 
      //searchResult = dbh.fetchNotes(searchTitle.getText().toString()); 

      String title = "", note = ""; 


      for (int count = 0 ; count < searchResult.size() ; count++) { 

        note = searchResult.get(count)[1]; 
        title = searchResult.get(count)[0];       

        listItems.add(title); 

      }     

       adapter.notifyDataSetChanged(); 
    } 

    @Override 
    public 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; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     // Handle action bar item clicks here. The action bar will 
     // automatically handle clicks on the Home/Up button, so long 
     // as you specify a parent activity in AndroidManifest.xml. 
     int id = item.getItemId(); 
     if (id == R.id.action_settings) { 
      return true; 
     } 
     return super.onOptionsItemSelected(item); 
    } 

    /** 
    * A placeholder fragment containing a simple view. 
    */ 
    public static class PlaceholderFragment extends Fragment { 

     public PlaceholderFragment() { 
     } 

     @Override 
     public View onCreateView(LayoutInflater inflater, ViewGroup container, 
       Bundle savedInstanceState) { 
      View rootView = inflater.inflate(R.layout.fragment_main, container, 
        false); 
      return rootView; 
     } 
    } 


    public void addNote(View v){ 
     Intent newActivity = new Intent (this, AddingNote.class); 
     startActivity(newActivity); 
     finish(); 
    } 

} 

我的數據庫類：

<ListView 
     android:id="@android:id/list" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:layout_alignParentLeft="true" 
     android:layout_below="@+id/container" > 

    </ListView> 

我很新的android開發，所以任何幫助將gratefull y讚賞。謝謝。

Answer 1

設置一個onClickListener你的ListView和啓動意圖指向您EditNote活動是利用它得到的數據：

getIntent().getStringExtra(...); 

---

例子：

MainActivity：

getListView().setOnItemClickListener(new OnItemClickListener() { 
    public void onItemClick(AdapterView<?> parent, View view, 
      int position, long id) { 

     Intent i = new Intent(this, EditNote.class); 
     i.putExtra("listItem", listItems[position]); 
     startActivity(i); 

} 
}); 

編輯筆記：

String listItem = getIntent（）。getStringExtra（「listItem」）;

這是你在找什麼？