如何通过Android中的按钮增加或减少TextView数量

Question

我正在用textview创建两个按钮，如果单击加号按钮，textview应该增加，反之亦然。现在，我进行了一项活动，即在单击列表视图项时将出现一个对话框，并且其中有一些复选框，按钮，微调框等。我尝试将代码添加到警报框和按钮中。但是它不能正常工作，如果我单击加号按钮给出的最后限制是45，则变为46，如果我单击减小按钮，它只会减小一次。

这是我的SubMenu活动：

public class SubMenu extends AppCompatActivity {

    JSONObject jsonobject;
    JSONArray jsonarray;
    ListView listview;
    ListViewAdapter adapter;
    ProgressDialog mProgressDialog;
    ArrayList<HashMap<String, String>> arraylist;
    static String RANK = "id";
    static String COUNTRY = "name";

    static String FLAG = "image";

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);


        setContentView(R.layout.activity_sub_menu);

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        String SelectedId = getIntent().getStringExtra("id");


        getSupportActionBar().setDisplayHomeAsUpEnabled(true);






        // Get the view from listview_main.xml

        // Execute DownloadJSON AsyncTask
        new DownloadJSON().execute();
    }

    // DownloadJSON AsyncTask
    private class DownloadJSON extends AsyncTask<Void, Void, Void> implements AdapterView.OnItemClickListener {

        // @Override
        //  protected void onPreExecute() {
        //  super.onPreExecute();
        // Create a progressdialog
        //   mProgressDialog = new ProgressDialog(SubMenu.this);
        // Set progressdialog title
        //   mProgressDialog.setTitle("Categories of Main categories.....");
        // Set progressdialog message
        //  mProgressDialog.setMessage("Loading...");
        //  mProgressDialog.setIndeterminate(false);
        // Show progressdialog
        //  mProgressDialog.show();
        // }

        @Override
        protected Void doInBackground(Void... params) {
            // Create an array
            arraylist = new ArrayList<HashMap<String, String>>();
            // Retrieve JSON Objects from the given URL address
            jsonarray = JsonFunctions
                    .getJSONfromURL("http://cloud.......com/broccoli/menu_typeitem.php?id=" + getIntent().getStringExtra("id"));
            try {
                // Locate the array name in JSON
//                    jsonarray = jsonobject.getJSONArray("main_menu_items");


                for (int i = 0; i < jsonarray.length(); i++) {
                    HashMap<String, String> map = new HashMap<String, String>();

                    jsonobject = jsonarray.getJSONObject(i);
                    // Retrive JSON Objects
                    // map.put("id", jsonobject.getString("id"));
                    map.put("name", jsonobject.getString("name"));

                    map.put("image", jsonobject.getString("image"));
                    // Set the JSON Objects into the array
                    arraylist.add(map);
                }
            } catch (JSONException e) {
                Log.e("Error", e.getMessage());
                e.printStackTrace();
            }
            return null;
        }

        @Override
        protected void onPostExecute(Void args) {
            // Locate the listview in listview_main.xml
            listview = (ListView) findViewById(R.id.list1);
            // Pass the results into ListViewAdapter.java
            adapter = new ListViewAdapter(SubMenu.this, arraylist);
            // Set the adapter to the ListView
            listview.setAdapter(adapter);
            listview.setOnItemClickListener(this);
            // Close the progressdialog
            // mProgressDialog.dismiss();
        }



        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                                int position, long rowId) {





            final AlertDialog customDialog = new AlertDialog.Builder(SubMenu.this).create();
            final LayoutInflater inflater = getLayoutInflater();
            final View dialogView = inflater.inflate(R.layout.popup
                    , null);
            customDialog.setView(dialogView);
            // set the custom customDialogimation components - text, image and button
            final TextView tvDistance = (TextView) dialogView.findViewById(R.id.h2);

            final Button ok=(Button)dialogView.findViewById(R.id.ok) ;
            ok.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View v) {

                    customDialog.dismiss();


                }
            });





            final Button cncl=(Button)dialogView.findViewById(R.id.canc) ;
            cncl.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View v) {

                    customDialog.dismiss();


                }
            });


       Button _decrease = (Button) dialogView.findViewById(R.id.incr);
            Button  _increase = (Button) dialogView.findViewById(R.id.decr);
          final TextView  _value = (TextView) dialogView.findViewById(R.id.value);




  _decrease.setOnClickListener(new View.OnClickListener() {

            int currentID = (int) System.currentTimeMillis();
            int lastID;

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                removeLastTextView();
                lastID--;
            }
        });

        _increase.setOnClickListener(new View.OnClickListener() {

            int currentID = (int) System.currentTimeMillis();
            int lastID;

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                addNewTextView();
                lastID = currentID;
                currentID++;
            }
        });
    }
}



    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case android.R.id.home:
                onBackPressed();
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }
}

这是我想要制作微调器的图像：我想要在微调器上具有这些图像

Answer 1

用以下代码替换代码：

public class SubMenu extends AppCompatActivity {

    JSONObject jsonobject;
    JSONArray jsonarray;
    ListView listview;
    ListViewAdapter adapter;
    ProgressDialog mProgressDialog;
    ArrayList<HashMap<String, String>> arraylist;
    static String RANK = "id";
    static String COUNTRY = "name";

    static String FLAG = "image";
    Integer i = 1;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);


        setContentView(R.layout.activity_sub_menu);

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        String SelectedId = getIntent().getStringExtra("id");


        getSupportActionBar().setDisplayHomeAsUpEnabled(true);


        // Get the view from listview_main.xml

        // Execute DownloadJSON AsyncTask
        new DownloadJSON().execute();
    }

    // DownloadJSON AsyncTask
    private class DownloadJSON extends AsyncTask<Void, Void, Void> implements AdapterView.OnItemClickListener {

        // @Override
        //  protected void onPreExecute() {
        //  super.onPreExecute();
        // Create a progressdialog
        //   mProgressDialog = new ProgressDialog(SubMenu.this);
        // Set progressdialog title
        //   mProgressDialog.setTitle("Categories of Main categories.....");
        // Set progressdialog message
        //  mProgressDialog.setMessage("Loading...");
        //  mProgressDialog.setIndeterminate(false);
        // Show progressdialog
        //  mProgressDialog.show();
        // }

        @Override
        protected Void doInBackground(Void... params) {
            // Create an array
            arraylist = new ArrayList<HashMap<String, String>>();
            // Retrieve JSON Objects from the given URL address
            jsonarray = JsonFunctions
                    .getJSONfromURL("http://cloud.......com/broccoli/menu_typeitem.php?id=" + getIntent().getStringExtra("id"));
            try {
                // Locate the array name in JSON
//                    jsonarray = jsonobject.getJSONArray("main_menu_items");


                for (int i = 0; i < jsonarray.length(); i++) {
                    HashMap<String, String> map = new HashMap<String, String>();

                    jsonobject = jsonarray.getJSONObject(i);
                    // Retrive JSON Objects
                    // map.put("id", jsonobject.getString("id"));
                    map.put("name", jsonobject.getString("name"));

                    map.put("image", jsonobject.getString("image"));
                    // Set the JSON Objects into the array
                    arraylist.add(map);
                }
            } catch (JSONException e) {
                Log.e("Error", e.getMessage());
                e.printStackTrace();
            }
            return null;
        }

        @Override
        protected void onPostExecute(Void args) {
            // Locate the listview in listview_main.xml
            listview = (ListView) findViewById(R.id.list1);
            // Pass the results into ListViewAdapter.java
            adapter = new ListViewAdapter(SubMenu.this, arraylist);
            // Set the adapter to the ListView
            listview.setAdapter(adapter);
            listview.setOnItemClickListener(this);
            // Close the progressdialog
            // mProgressDialog.dismiss();
        }


        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                                int position, long rowId) {


            final AlertDialog customDialog = new AlertDialog.Builder(SubMenu.this).create();
            final LayoutInflater inflater = getLayoutInflater();
            final View dialogView = inflater.inflate(R.layout.popup
                    , null);
            customDialog.setView(dialogView);
            // set the custom customDialogimation components - text, image and button
            final TextView tvDistance = (TextView) dialogView.findViewById(R.id.h2);

            final Button ok = (Button) dialogView.findViewById(R.id.ok);
            ok.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View v) {

                    customDialog.dismiss();


                }
            });


            final Button cncl = (Button) dialogView.findViewById(R.id.canc);
            cncl.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View v) {

                    customDialog.dismiss();


                }
            });


            Button _decrease = (Button) dialogView.findViewById(R.id.incr);
            Button _increase = (Button) dialogView.findViewById(R.id.decr);
            final TextView _value = (TextView) dialogView.findViewById(R.id.value);
            i = Integer.parseInt(_value.getText().toString());


            _decrease.setOnClickListener(new View.OnClickListener() {


            public void onClick(View v) {
                String _stringVal;
                Log.d("src", "Decreasing value...");
                if (i > 0) {
                    i = i - 1;
                    _stringVal = String.valueOf(i);
                    _value.setText(_stringVal);
                } else {
                    Log.d("src", "Value can't be less than 0");
                }

            }
        });

            _increase.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View v) {
                    String _stringVal;

                    Log.d("src", "Increasing value...");
                    i = i + 1;
                    _stringVal = String.valueOf(i);
                    _value.setText(_stringVal);
                }
            });
            customDialog.show();
        }


    }


    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case android.R.id.home:
                onBackPressed();
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }
}