向水平布局中添加微调框

时间:2018-09-07 22:37:20

标签: android

到目前为止,我已经通过horizontallayout方法创建了一个createRow(),并且已经成功地将参数添加到了我的edittext和checkbox make方法中,也将它们添加到了水平布局中。

我现在想在我的make spinner方法中添加参数,以便也可以将其添加到水平布局中。

这就是我想要的最终结果:(没有任何微调器输入的虚拟应用)

enter image description here

目前,除微调框外,我的应用程序已经实现了。当我尝试将参数添加到微调器中,然后尝试通过按按钮添加一行时,应用程序崩溃,我得到了NPE。

我已经读过此What is a NullPointerException, and how do I fix it?,但对于那对我的处境有何影响,我仍然感到困惑。因此,不胜感激。

谢谢!

create.java代码

public class create extends AppCompatActivity {


    private LinearLayout mLinearLayout;
    private ArrayList<SearchableSpinner> mSpinners;
    private List<AppCompatButton> mButtons = new ArrayList<>();
    private List<CheckBox> mCheckboxes = new ArrayList<>();
    private List<TextView> mTextviews = new ArrayList<>();
    private List<EditText> mEdittexts = new ArrayList<>();
    private List<View> mViews = new ArrayList<>();
    private Map<String, String> numberItemValues = new HashMap<>();
    private Spinner spinner;
    private TextView textview;
    private CheckBox checkbox;
    List<String> itemList = new ArrayList<>();
    LinearLayout verticallayout,horizontalLayout;
    public static final String MY_PREFS_NAME = "MyPrefsFile";






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

        verticallayout = findViewById(R.id.verticalLayout); //got





        //Arrays
        ArrayList<String> items = new ArrayList<>();
        items.add(String.valueOf(mSpinners)); // add you selected item
        mSpinners = new ArrayList<>();




        //Initializing Variables Here
        mLinearLayout = findViewById(R.id.my_linearLayout);
        //verticallayout = findViewById(R.id.verticalLayout);
        textview = findViewById(R.id.textview);
        checkbox = findViewById(R.id.checkbox);





        //TODO getting shared prefs on create
        SharedPreferences prefs = getSharedPreferences(MY_PREFS_NAME, MODE_PRIVATE);

        try {
            JSONArray jsonArray2 = new JSONArray(prefs.getString("key", null));
            for (int i = 0; i < jsonArray2.length(); i++) {



              /*  final Spinner spinner = makeSpinner();
                mLinearLayout.addView(spinner);*/

                final View newView = makeView();
                //Add a new view
                mLinearLayout.addView(newView);
                mViews.add(newView);


              /* final EditText newEdittext = makeEdittext();
                mLinearLayout.addView(newEdittext);
                mEdittexts.add(newEdittext);



                final CheckBox newCheckbox = makeCheckbox();
                mLinearLayout.addView(newCheckbox);

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

                createRow();

                final TextView newTextview = makeTextview();
                mLinearLayout.addView(newTextview);
                mTextviews.add(newTextview);



                //TODO Add the spinner on item selected listener to get selected items
                spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
                    @Override
                    public void onItemSelected(AdapterView<?> parentView, View selectedItemView, int position, long id) {
                        String currentItem = itemList.get(position);
                        String aisleNumber = numberItemValues.get(currentItem);
                        //TODO you can use the above aisle number to add to your text view
                        //mTextviews.get(mTextviews.size() -1).setText(aisleNumber);
                        newTextview.setText(aisleNumber);
                    }

                    @Override
                    public void onNothingSelected(AdapterView<?> parentView) {
                        //  do nothing
                    }
                });

                final int listSize = mViews.size();

                //TODO deleting item
                horizontalLayout.setOnClickListener(new View.OnClickListener() {
                    //start
                    @Override
                    public void onClick(View view) {

                        //when the 'new button' is pressed, alert shows if you are sure you want to delete the item or not.

                        final View.OnClickListener context = this;


                        AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(create.this);


                        // set title
                        alertDialogBuilder.setTitle("Delete Item");

                        // set dialog message
                        alertDialogBuilder
                                .setMessage("Are you sure you want to delete this item?")
                                .setCancelable(false)
                                .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                                    public void onClick(DialogInterface dialog, int id) {
                                        // if this button is clicked, close
                                        // current activity


                                        if (listSize > 0) {

                                            //mCheckboxes.get(listSize - 1).setVisibility(View.GONE);
                                            mSpinners.get(listSize - 1).setVisibility(View.GONE);
                                           // mSpinners.remove(listSize - 1);

                                            mViews.get(listSize - 1).setVisibility(View.GONE);
                                            mTextviews.get(listSize - 1).setVisibility(View.GONE);
                                           // mEdittexts.get(listSize - 1).setVisibility(View.GONE);
                                            Toast.makeText(getBaseContext(), "Item removed.", Toast.LENGTH_SHORT).show();

                                        }


                                    }
                                })
                                .setNegativeButton("No", new DialogInterface.OnClickListener() {
                                    public void onClick(DialogInterface dialog, int id) {
                                        // if this button is clicked, just close
                                        // the dialog box and do nothing
                                        dialog.cancel();
                                    }
                                });

                        // create alert dialog
                        AlertDialog alertDialog = alertDialogBuilder.create();

                        // show it
                        alertDialog.show();


                    }
                });





                int positionOfSpinner = (int) jsonArray2.get(i);
                spinner.setSelection(positionOfSpinner);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        //end of shared pref  code








        //TODO FAB BUTTON
        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();
                spinner = findViewById(R.id.spinner);



                // Handle ze click.
               /* final Spinner spinner = makeSpinner();
                mLinearLayout.addView(spinner);


                LinearLayout.LayoutParams layoutParams = (LinearLayout.LayoutParams) spinner.getLayoutParams();
                layoutParams.setMargins(5, 100, 10, 0); //top 70

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

                layoutParams.height = (int) (70 * ((float) metrics.densityDpi / DisplayMetrics.DENSITY_DEFAULT)); //80
                layoutParams.width = (int) (240 * ((float) metrics.densityDpi / DisplayMetrics.DENSITY_DEFAULT)); //240
                spinner.setLayoutParams(layoutParams);
*/
                final View newView = makeView();
                mLinearLayout.addView(newView);
                mViews.add(newView);


               /* final EditText newEdittext = makeEdittext();
                mLinearLayout.addView(newEdittext);
                mEdittexts.add(newEdittext);*/

               createRow();

                final int listSize = mViews.size();

                //code for deleting the said item.



                horizontalLayout.setOnClickListener(new View.OnClickListener() {
                    //start
                    @Override
                    public void onClick(View view) {

                        //when the 'new button' is pressed, alert shows if you are sure you want to delete the item or not.

                        final View.OnClickListener context = this;


                        AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(create.this);



                        // set title
                        alertDialogBuilder.setTitle("Delete Item");

                        // set dialog message
                        alertDialogBuilder
                                .setMessage("Are you sure you want to delete this item?")
                                .setCancelable(false)
                                .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                                    public void onClick(DialogInterface dialog, int id) {
                                        // if this button is clicked, close
                                        // current activity


                                        if (listSize > 0) {

                                            //mCheckboxes.get(listSize - 1).setVisibility(View.GONE);
                                            mSpinners.get(listSize - 1).setVisibility(View.GONE);
                                            mSpinners.remove(listSize - 1);
                                            mViews.get(listSize - 1).setVisibility(View.GONE);
                                            mTextviews.get(listSize - 1).setVisibility(View.GONE);
                                            //mEdittexts.get(listSize - 1).setVisibility(View.GONE);
                                            Toast.makeText(getBaseContext(), "Item removed.", Toast.LENGTH_SHORT).show();

                                        }
                                    }
                                })
                                .setNegativeButton("No", new DialogInterface.OnClickListener() {
                                    public void onClick(DialogInterface dialog, int id) {
                                        // if this button is clicked, just close
                                        // the dialog box and do nothing
                                        dialog.cancel();
                                    }
                                });

                        // create alert dialog
                        AlertDialog alertDialog = alertDialogBuilder.create();

                        // show it
                        alertDialog.show();


                    }
                });

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

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


                final TextView newTextview = makeTextview();
                mLinearLayout.addView(newTextview);
                mTextviews.add(newTextview);

                //TODO Add the spinner on item selected listener to get selected items
                spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
                    @Override
                    public void onItemSelected(AdapterView<?> parentView, View selectedItemView, int position, long id) {
                        String currentItem = itemList.get(position);
                        String aisleNumber = numberItemValues.get(currentItem);
                        //TODO you can use the above aisle number to add to your text view
                        //mTextviews.get(mTextviews.size() -1).setText(aisleNumber);
                        newTextview.setText(aisleNumber);
                    }

                    @Override
                    public void onNothingSelected(AdapterView<?> parentView) {
                        //  code here, do nothing
                    }

                });


            }
        });

    }



















    //TODO OVERFLOW MENU
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.create_menu, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        int id = item.getItemId();

        if (id == R.id.action_settings) {
            /*Intent startSettingsActivity = new Intent(this, AppCompatPreferenceActivity.class);
            startActivity(startSettingsActivity);
            //start the settings activity here.*/

            startActivity(new Intent(create.this, settings.class));





            return true;
        }


        else if (id == R.id.action_delete) {
            //code to delete list here.

            SharedPreferences.Editor editor = getSharedPreferences(MY_PREFS_NAME, MODE_PRIVATE).edit();
            editor.clear();
            editor.commit();

            Toast.makeText(getBaseContext(), "List removed.", Toast.LENGTH_SHORT).show();
            return true;
        }


        else if (id ==R.id.action_help)  {


                // setup the alert builder
                AlertDialog.Builder builder = new AlertDialog.Builder(this);
                builder.setTitle("Help");
                builder.setMessage("To use this app, first go to Create your Shopping List.\n" +
                        "Here, you can add items to your list. Once you have added all items, you can click the menu at the top right corner (or if it doesnt appear press your menu button beside your home button on your device, then click View your List.\n" +
                        "This will take you to the screen where you can view you shopping list with the items in aisle order to make your shop much easier.\n" +
                        "You can still add items at this point. Press the white background of each item to delete the item if you wish.");

                // add a button
                builder.setPositiveButton("OK", null);

                // create and show the alert dialog
                AlertDialog dialog = builder.create();
                dialog.show();


            return true;

        }




        else if (id == R.id.action_gotoview) {


            //takes the size of the list of spinners, for reference
            ArrayList<Integer> spinnerList = new ArrayList<>();
            for(int i = 0; i < mSpinners.size(); i++) {
                spinnerList.add(mSpinners.get(i).getSelectedItemPosition());

            }
            Bundle newBundle = new Bundle();
            newBundle.putIntegerArrayList("arraylist", spinnerList);
            Intent newIntent = new Intent(create.this, view.class);
            newIntent.putExtra("extraBundle", newBundle);

            startActivity(newIntent);



            //code to go to view screen, aka intent
            return true;
        }



        return super.onOptionsItemSelected(item);
    }






    public void createRow(View view){

        createRow(); //got

    }


    private void createRow() { //got

        horizontalLayout = new LinearLayout(this);

        LinearLayout.LayoutParams horizontalParams = new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
        horizontalLayout.setOrientation(LinearLayout.HORIZONTAL);
        horizontalParams.height = 80;
        horizontalParams.setMargins(0, 15, 0, 15); // LEFT, TOP, RIGHT, BOTTOM
        horizontalLayout.setLayoutParams(horizontalParams);
        horizontalLayout.setBackgroundColor(ContextCompat.getColor(this, R.color.addButtons));


        makeEdittext();
        makeCheckbox();
        makeSpinner();



        verticallayout.addView(horizontalLayout, horizontalParams);
    }







    //DUPLICATING ITEMS WHEN FAB 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);


        //setup relative layout for the positioning of the objects
        Resources resources = getResources();
        DisplayMetrics metrics = resources.getDisplayMetrics();
        RelativeLayout.LayoutParams relativeParams = new RelativeLayout.LayoutParams((int) (70 * ((float) metrics.densityDpi / DisplayMetrics.DENSITY_DEFAULT)), (int) (240 * ((float) metrics.densityDpi / DisplayMetrics.DENSITY_DEFAULT)));
        relativeParams.addRule(RelativeLayout.RIGHT_OF, R.id.textview);

        checkbox.setLayoutParams(relativeParams);
        checkbox.setLayoutParams(layoutParams);*/



        LinearLayout.LayoutParams checkParams = new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
        checkParams.setMargins(10, 10, 10, 10);
        checkParams.gravity = Gravity.LEFT;

        checkbox.setLayoutParams(checkParams);
        horizontalLayout.addView(checkbox);


        return checkbox;
    }



    private TextView makeTextview() {
        //create new textview
        TextView textview = new TextView(this);

        //setup layout

        LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.MATCH_PARENT,
                LinearLayout.LayoutParams.WRAP_CONTENT);
        textview.setLayoutParams(layoutParams);
        textview.setTextSize(30);

        return textview;
    }



    private EditText makeEdittext() {
        //create new edittext
        EditText edittext = new EditText(this);

        //setup layout
       /* final LinearLayout.LayoutParams lparams = new LinearLayout.LayoutParams(70, 50); // Width , height
        edittext.setLayoutParams(lparams);*/


       /* LinearLayout.LayoutParams editParams = new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
        editParams.setMargins(10, 10, 10, 10);*/

       // edittext.setLayoutParams(lparams);

/*
        edittext.setLayoutParams(editParams);
        horizontalLayout.addView(edittext);*/



        LinearLayout.LayoutParams editParams = new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
        editParams.setMargins(10, 10, 10, 10);
        editParams.width = 70;
        editParams.height = 50;

        edittext.setLayoutParams(editParams);
        horizontalLayout.addView(edittext);


        edittext.setInputType(InputType.TYPE_CLASS_NUMBER | InputType.TYPE_NUMBER_FLAG_DECIMAL | InputType.TYPE_NUMBER_FLAG_SIGNED);
        edittext.setHint("qty");

        return edittext;

    }

//set the  3d effect to view

    private View makeView() {
        //create new View

        View view = new View(this);
        view.setBackgroundColor(Color.parseColor("#ffffff"));
        LinearLayout.LayoutParams layoutParams =  new LinearLayout.LayoutParams( LinearLayout.LayoutParams.MATCH_PARENT, 100);
        new LinearLayout.LayoutParams( LinearLayout.LayoutParams.WRAP_CONTENT, 50);


        view.setLayoutParams(layoutParams);


        view.setClickable(true);

        //view.setLayoutParams(layoutParams);


        //setup layout

        return view;


    }














    private Spinner makeSpinner() {
        //opens csv
        InputStream inputStream = getResources().openRawResource(R.raw.shopitems);
        CSVFile csvFile = new CSVFile(inputStream);
        //TODO I made this variable global, declared it at the very top of this file
        itemList = csvFile.read();

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


        // Setup layout

        LinearLayout.LayoutParams spinnerParams = new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
        spinnerParams.setMargins(10, 10, 10, 10);
        spinnerParams.gravity = Gravity.LEFT;

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

        spinnerParams.height = (int) (70 * ((float) metrics.densityDpi / DisplayMetrics.DENSITY_DEFAULT)); //80
        spinnerParams.width = (int) (240 * ((float) metrics.densityDpi / DisplayMetrics.DENSITY_DEFAULT)); //240

        spinner.setLayoutParams(spinnerParams);
        horizontalLayout.addView(spinner);

    /*    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;
    }



    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(",");
                    //TODO I edited this part so that you'd add the values in our new hash map variable
                    numberItemValues.put(row[1], row[0]);
                    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;
        }
    }


    //on stop, the things are saved into shared prefs
    @Override
    protected void onStop () {

        //public static final String MY_PREFS_NAME = "MyPrefsFile";
        SharedPreferences.Editor editor = getSharedPreferences(MY_PREFS_NAME, MODE_PRIVATE).edit();
        JSONArray jsonArray = new JSONArray();
        for(int i = 0; i < mSpinners.size(); i++) {
            jsonArray.put(mSpinners.get(i).getSelectedItemPosition());

        }

        editor.putString("key", jsonArray.toString());
        editor.apply();


        super.onStop();
    }

}

LOGCAT:这是我按按钮添加行时遇到的错误

09-08 12:15:28.417 18334-18334/com.app.supermarketaislefinder E/AndroidRuntime: FATAL EXCEPTION: main
    java.lang.NullPointerException
        at com.app.supermarketaislefinder.create$3.onClick(create.java:357)
        at android.view.View.performClick(View.java:4162)
        at android.view.View$PerformClick.run(View.java:17082)
        at android.os.Handler.handleCallback(Handler.java:615)
        at android.os.Handler.dispatchMessage(Handler.java:92)
        at android.os.Looper.loop(Looper.java:137)
        at android.app.ActivityThread.main(ActivityThread.java:4867)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:511)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1007)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:774)
        at dalvik.system.NativeStart.main(Native Method)

0 个答案:

没有答案