当取消按钮被按下时，Android取消事件

Question

在我的项目中，当我按下确认按钮时，数据将保存在sqlite上。我想使取消按钮的工作取消，而不是插入数据到数据库。我该怎么办?我使用onSaveInstanceState。请帮帮我。谢谢。

cancelBtn.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            finish();
        }
    });
protected void onSaveInstanceState(Bundle outState)
{
    super.onSaveInstanceState(outState);
    saveState();
    outState.putSerializable(FridgeDbAdapter.KEY_ROWID, mRowId);
}
@Override
protected void onPause()
{
    super.onPause();
    saveState();
}
@Override
protected void onResume()
{
    super.onResume();
    populateFields();
}
private void saveState() 
{
    String name = (String) nameEdit.getText().toString();
    String category = (String) categoryEdit.getText().toString();
    String expired_date = (String) expired_Date_Btn.getText().toString();
    byte[] image = ConvertDrawableToByteArray(mImageView.getDrawable());
    if(mRowId == null)
    {
        long id = mDbHelper.insertItem(category, name, expired_date, image);
        if(id>0)
        {
            mRowId = id;
        }           
    }
    else 
    {
        mDbHelper.updateItem(mRowId, category, name, expired_date, image);
    }   
}

Answer 1

你可以这样做:

        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("Choosing time");
        builder.setMessage("Do you want to save the data?");
        builder.setPositiveButton("OK",   new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                saveData(); //Function that saves your the data.
            }
        });
        builder.setNegativeButton("NO",
                new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                finish();// Finish Activity.
            }
        });
        builder.create();
        builder.show();