CODEWITHSUNDEEP
androidkeydownonpause
wholee1
wholee1

Reputation: 1501

Android how to cancel event with back key without saving data

I am trying to use handle database with insert, update, and delete such as notepad. I have problem with back key because when I press the back key, I don't want to save any data. In normal case which presses the confirm button, it will be saved into sqlite and will be displayed on listview. How can I make cancel event through back key or more button event? I am trying to use onBackPressed, onPause, and onResume. When I press the back key in edit page, onPause() is calling, but I do not want to use saveState() when I pressed back key. How can I make it? Could you give me some feedback? Thanks.

@Override
protected void onPause() {
    Toast.makeText(this, "onPause", Toast.LENGTH_SHORT).show();
    super.onPause();
    saveState();

}

@Override
protected void onResume() {
    Toast.makeText(this, "onResume", Toast.LENGTH_SHORT).show();
    super.onResume();
    Resume_populateFields();
}

@Override 
public void onBackPressed() { 
    Toast.makeText(this, "onBackPressed", Toast.LENGTH_SHORT).show();
      super.onBackPressed();
      finish();    
}    

private void saveState() {
    String name = (String) nameEdit.getText().toString();
    String category = (String) categoryEdit.getText().toString();
    String expired_date = (String) expired_Date_Btn.getText().toString();
    Bitmap imageBitmap = ((BitmapDrawable) mImageView.getDrawable())
            .getBitmap();
    ByteArrayOutputStream imageByteStream = new ByteArrayOutputStream();
    imageBitmap.compress(Bitmap.CompressFormat.PNG, 100, imageByteStream);

    if (mRowId == null) {
        long id = mDbHelper.insertItem(category, name, expired_date,
                imageByteStream);

        if (id > 0) {
            mRowId = id;
        }
    } else {
        mDbHelper.updateItem(mRowId, category, name, expired_date,
                imageByteStream);
    }
}

    private void Resume_populateFields() {
    if (mRowId != null) {
        Cursor data = mDbHelper.fetchItem(mRowId);
        startManagingCursor(data);
        // load information from sqlite
        nameEdit.setText(data.getString(data
                .getColumnIndexOrThrow(FridgeDbAdapter.KEY_NAME)));
        categoryEdit.setText(data.getString(data
                .getColumnIndexOrThrow(FridgeDbAdapter.KEY_CATEGORY)));
        expired_Date_Btn.setText(data.getString(data
                .getColumnIndexOrThrow(FridgeDbAdapter.KEY_EXPIRED_DATE)));

    } else {
        // call display date when list is clicked
        expired_Date_Btn.setText(new StringBuilder().append(mDay)
                .append("/")
                // month is 0 based. Then add 1
                .append(mMonth + 1).append("/").append(mYear).append(" "));
    }

}

Upvotes: 1

Views: 994

Answers (1)

hovanessyan
hovanessyan

Reputation: 31463

Define a boolean flag isOnBackeyPressed; Than:

@Override 
public void onBackPressed() { 
    Toast.makeText(this, "onBackPressed", Toast.LENGTH_SHORT).show();
      super.onBackPressed();
      isOnBackeyPressed = true;
      finish();    
}    


@Override
protected void onPause() {
    Toast.makeText(this, "onPause", Toast.LENGTH_SHORT).show();
    super.onPause();
    if (!isOnBackKeyPressed)
       saveState();

}

If your lifecycle is different, just adopt the idea.

Upvotes: 2

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