SQLiteDatabase Part4: Update an Delete data in Table Example

Part4: update and delete the data in table

 Update Screenshots:

Delete Screenshots:

Step 1: Add the following update and delete methods in DBAdapter.java to manipulate the database

DBAdapter.java

public Cursor getValuesById(int id){

       return database.rawQuery("select * from sample_table where _id = "+id, null);

}

public int updateValues(int id, String name, String contact) {

       ContentValues values2 = new ContentValues();

       values2.put("name", name);

       values2.put("phone", contact);

       return database.update(DBOpenHelper.SAMPLE_TABLE_NAME, values2,

                     "_id=?", new String[] { "" + id });

}

public int deleteById(int id){

       return database.delete(DBOpenHelper.SAMPLE_TABLE_NAME, "_id=?", new String[]{""+id});

}

Step 2: Create context menu xml file to display option when long click on the list item

res/menu/listview_context_menu.xml

listview_context_menu.xml

<?xml version="1.0" encoding="utf-8"?>

<menu xmlns:android="http://schemas.android.com/apk/res/android" >

    <item

        android:id="@+id/context_item_edit"

        android:title="Edit"/>

    <item

        android:id="@+id/context_item_delete"

        android:title="Delete"/>

</menu>

ViewAllDetails.java

Step 3: Register context menu for listView, write the following code in onCreate()

registerForContextMenu(listView);

Step 4: Add the following code in onCreate()

listView.setOnItemLongClickListener(new OnItemLongClickListener() {

       @Override

       public boolean onItemLongClick(AdapterView<?> arg0, View arg1,

                     int arg2, long arg3) {

              String id = ((TextView) arg1

                           .findViewById(R.id.custom_textView_id)).getText()

                           .toString();

              selected_item_id = Integer.parseInt(id);

              return false;

       }

});

Step 5: Add two methods onCreateContextMenu and onContextItemSelected in ViewAllDetails.java

@Override

public void onCreateContextMenu(ContextMenu menu, View v,ContextMenuInfo menuInfo) {

       getMenuInflater().inflate(R.menu.listview_context_menu, menu);

       super.onCreateContextMenu(menu, v, menuInfo);

}

      

@Override

public boolean onContextItemSelected(MenuItem item) {

switch (item.getItemId()) {

case R.id.context_item_edit:

       dialog = new Dialog(ViewAllActivity.this);

       dialog.setTitle("Edit Details");

       dialog.setContentView(R.layout.custom_dialog);

       dialog.show();

       Cursor cursor = dbAdapter.getValuesById(selected_item_id);

       cursor.moveToFirst();

       editText_name = (EditText) dialog

                     .findViewById(R.id.custom_dialog_editText_name);

       editText_phone = (EditText) dialog

                     .findViewById(R.id.custom_dialog_editText_phone);

       Button button_save = (Button) dialog

                     .findViewById(R.id.custom_dialog_button_save);

       Button button_cancel = (Button) dialog

                     .findViewById(R.id.custom_dialog_button_cancel);

       editText_name.setText(cursor.getString(1));

       editText_phone.setText(cursor.getString(2));

       button_save.setOnClickListener(new OnClickListener() {

              @Override

              public void onClick(View v) {

              String name = editText_name.getText().toString();

              String phone = editText_phone.getText().toString();

              int response = dbAdapter.updateValues(selected_item_id,

                           name, phone);

              if (response == -1) {

                     Toast.makeText(getApplicationContext(),  "Data Failed Update", Toast.LENGTH_LONG).show();

              } else {

                     refreshListView();

                     Toast.makeText(getApplicationContext(),  "Data Updated successfully", Toast.LENGTH_LONG)

                                  .show();

              }

              dialog.dismiss();

              }

       });

       button_cancel.setOnClickListener(new OnClickListener() {

              @Override

              public void onClick(View v) {

                     dialog.dismiss();

              }

       });

       break;

case R.id.context_item_delete:

       int response = dbAdapter.deleteById(selected_item_id);

       if (response == -1) {

       Toast.makeText(getApplicationContext(),  "Data failed to delete successfully", Toast.LENGTH_LONG).show();

       } else {

       Toast.makeText(getApplicationContext(),  "Data deleted successfully", Toast.LENGTH_LONG).show();

       refreshListView();

       }

       break;

}

       return super.onContextItemSelected(item);

}

Step 6: Add refreshListView() to refresh the listView content after Update and Delete Items

private void refreshListView() {

              cursor = dbAdapter.getAllValues();

              cursor.moveToFirst();

              MyAdapter adapter = new MyAdapter();

              listView.setAdapter(adapter);

       }