问android下按下按钮后如何删除某些元素

EN

  public class create extends AppCompatActivity {


    private LinearLayout mLinearLayout;

    private ArrayList<SearchableSpinner> mSpinners;
    //TODO add the below list of buttons and checkboxes
    private List<AppCompatButton> mButtons = new ArrayList<>();
    private List<CheckBox> mCheckboxes = new ArrayList<>();
    Button buttontest;





    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_create);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);




        mSpinners = new ArrayList<>();

        mLinearLayout = findViewById(R.id.my_linearLayout);

        //mLinearLayout.addView(makeSpinner());    // First spinner



        FloatingActionButton floatingActionButton =
                (FloatingActionButton) findViewById(R.id.fab);

        floatingActionButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(getBaseContext(), "Item added!" , Toast.LENGTH_SHORT ).show();

                // Handle the click.
                Spinner spinner = makeSpinner();
                mLinearLayout.addView(spinner); //Add another spinner


                LinearLayout.LayoutParams layoutParams = (LinearLayout.LayoutParams)spinner.getLayoutParams();
                layoutParams.setMargins( 5,  70,  10,  0);

                Resources resources = getResources();
                DisplayMetrics metrics = resources.getDisplayMetrics();

                layoutParams.height = (int) (80 * ((float)metrics.densityDpi / DisplayMetrics.DENSITY_DEFAULT)); //80
                layoutParams.width = (int) (240 * ((float)metrics.densityDpi / DisplayMetrics.DENSITY_DEFAULT)); //240
                spinner.setLayoutParams(layoutParams);


                //Add a new button
                AppCompatButton newButton = makeButton();
                mLinearLayout.addView(newButton);      // Add another button
                //TODO add button to the list
                mButtons.add(newButton);


                //Add a new checkbox
                CheckBox newCheckbox = makeCheckbox();
                mLinearLayout.addView(newCheckbox);

                //TODO add checkbox to your list
                mCheckboxes.add(newCheckbox);
            }
        });

    }


//DUPLICATING ITEMS WHEN + IS PRESSED

    private CheckBox makeCheckbox() {
        //Create new Checkbox
        CheckBox checkbox = new CheckBox(this);

        // Setup layout
        LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.MATCH_PARENT,
                LinearLayout.LayoutParams.WRAP_CONTENT);
        checkbox.setLayoutParams(layoutParams);
        return checkbox;
    }


    private AppCompatButton makeButton() { //creates new buttons i need
        //Create new Button
        AppCompatButton button = new AppCompatButton(this);
        // code for deleting the buttons i need //
        buttontest = (Button)findViewById(R.id.buttontest);
        buttontest.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {



                Toast.makeText(getBaseContext(), "Item removed." , Toast.LENGTH_SHORT ).show();

                //makeCheckbox().setVisibility(View.GONE);
                //buttontest.setVisibility(View.GONE);
                //TODO when you want to make one of them gone do the following
                //Last button disappears
                if(mButtons.size() > 0) {
                    mButtons.get(mButtons.size()-1).setVisibility(View.GONE);
                    //mButtons.remove(mButtons.size()-1);
                }

                //Last checkbox disappears
                if(mCheckboxes.size() > 0) {
                    mCheckboxes.get(mCheckboxes.size()-1).setVisibility(View.GONE);
                  //  mCheckboxes.remove(mCheckboxes.size()-1);
                }


                //Last checkbox disappears
                if(mSpinners.size() > 0) {
                    mSpinners.get(mSpinners.size()-1).setVisibility(View.GONE);
                   // mSpinners.remove(mSpinners.size()-1);
                }

                //Please note that the number within get() is the index of the buttons or
                //checkboxes you added so there could
                //be any number of items depends on how many you added

            }
        });



        // Setup layout
        LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.MATCH_PARENT,
                LinearLayout.LayoutParams.WRAP_CONTENT);
        button.setBackgroundColor(Color.parseColor("#ffffff"));


        return button;
    }

    private Spinner makeSpinner() {
        //opens csv
        InputStream inputStream = getResources().openRawResource(R.raw.shopitems);
        CSVFile csvFile = new CSVFile(inputStream);
        List<String> itemList = csvFile.read();

        //Create new spinner
       // SearchableSpinner spinner = (SearchableSpinner) new Spinner(this, Spinner.MODE_DROPDOWN);
        SearchableSpinner spinner = new SearchableSpinner(this);


        // Setup layout
        LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.MATCH_PARENT,
                LinearLayout.LayoutParams.WRAP_CONTENT);
        spinner.setLayoutParams(layoutParams);
        MyListAdapter adapter = new MyListAdapter(this, R.layout.listrow, R.id.txtid, itemList);


        spinner.setAdapter(adapter);



        //Add it to your list of spinners so you can retrieve their data when you click the getSpinner button
        mSpinners.add(spinner);
        return spinner;
    }



    //csv file code
    private class CSVFile {
        InputStream inputStream;

        public CSVFile(InputStream inputStream) {
            this.inputStream = inputStream;
        }

        public List<String> read() {

            List<String> resultList = new ArrayList<String>();
            BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
            try {
                String line;
                while ((line = reader.readLine()) != null) {
                    String[] row = line.split(",");
                    resultList.add(row[1]);
                }
            } catch (IOException e) {
                Log.e("Main", e.getMessage());
            } finally {
                try {
                    inputStream.close();
                } catch (IOException e) {
                    Log.e("Main", e.getMessage());
                }
            }
            return resultList;
        }
    }
}