Kann nicht festgelegt werden, OnCheckedChangeListener einer Checkbox

Können Sie nicht setzen Sie die Zuhörer für Ihre CheckBox von der ListView wie(wird es wahrscheinlich werfen Sie einen NullPointerException), stattdessen legen Sie den Hörer in die getView() Methode(Sie haben auch zu halten, die CheckBox status, so dass Sie am Ende nicht mit fremden Zeilen, status). Unten wird ein Beispiel:

public class ListViewActivity extends ListActivity {

    public class MyCustomAdapter extends ArrayAdapter<String> {

        private ArrayList<Boolean> status = new ArrayList<Boolean>();

        public MyCustomAdapter(Context context, int textViewResourceId,
                String[] objects) {
            super(context, textViewResourceId, objects);
            for (int i = 0; i < objects.length; i++) {
                status.add(false);
            }
        }

        @Override
        public View getView(final int position, View convertView,
                ViewGroup parent) {
            View row = convertView;
            if (row == null) {
                LayoutInflater inflater = getLayoutInflater();
                row = inflater.inflate(R.layout.adapters_listviewactivity_row,
                        parent, false);
            }

            TextView label = (TextView) row.findViewById(R.id.weekofday);
            label.setText(month[position]);
            CheckBox checkBox = (CheckBox) row.findViewById(R.id.checkBox);
            checkBox.setOnCheckedChangeListener(new OnCheckedChangeListener() {

                @Override
                public void onCheckedChanged(CompoundButton buttonView,
                        boolean isChecked) {
                    Toast.makeText(getApplicationContext(), "" + position,
                            Toast.LENGTH_SHORT).show();
                    if (isChecked) {
                        status.set(position, true);
                    } else {
                        status.set(position, false);
                    }
                }
            });
            checkBox.setChecked(status.get(position));
            return row;
        }
    }

    String[] month = { "January", "February", "March", "April", "May", "June",
            "July", "August", "September", "October", "November", "December" };

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setListAdapter(new MyCustomAdapter(ListViewActivity.this,
                R.layout.main, month));
    }

}

Für die TextView Sie haben zu tun die gleiche Sache.

InformationsquelleAutor Luksprog

public class MainActivity extends AppCompatActivity implements CompoundButton.OnCheckedChangeListener {
List<String> mList = new ArrayList<>();
CheckBox android, java, python, php, unity3D;
Button submitButton;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    android = (CheckBox) findViewById(R.id.androidCheckBox);
    android.setOnCheckedChangeListener(this);
    java = (CheckBox) findViewById(R.id.javaCheckBox);
    java.setOnCheckedChangeListener(this);
    python = (CheckBox) findViewById(R.id.pythonCheckBox);
    python.setOnCheckedChangeListener(this);
    php = (CheckBox) findViewById(R.id.phpCheckBox);
    php.setOnCheckedChangeListener(this);
    unity3D = (CheckBox) findViewById(R.id.unityCheckBox);
    unity3D.setOnCheckedChangeListener(this);

    submitButton = (Button) findViewById(R.id.submitButton);
    submitButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Log.e("ArrayList Values*******",mList.toString());
        }
    });

}

@Override
public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
    switch (compoundButton.getId()) {
        case R.id.androidCheckBox:
            if (android.isChecked()) {
                mList.add(String.valueOf(android.getText()));
                Log.e("Android*******",mList.toString());
            }
            else {
                    mList.remove(android.getText());
            }
            break;

        case R.id.javaCheckBox:
            if (java.isChecked()) {
                mList.add(String.valueOf(java.getText()));
                Log.e("Java*******",mList.toString());
            }
            else {
                mList.remove(java.getText());
            }
            break;

        case R.id.phpCheckBox:
            if (php.isChecked()) {
                mList.add(String.valueOf(php.getText()));
                Log.e("PHP*******",mList.toString());
            }
            else {
                mList.remove(php.getText());
            }
            break;

        case R.id.pythonCheckBox:
            if (python.isChecked()){
                mList.add(String.valueOf(python.getText()));
                Log.e("Python*******",mList.toString());
            }
            else {
                mList.remove(python.getText());
            }
            break;

        case R.id.unityCheckBox:
            if (unity3D.isChecked()){
                mList.add(String.valueOf(unity3D.getText()));
                Log.e("Unity*******",mList.toString());
            }
            else {
                mList.remove(unity3D.getText());
            }
            break;
      }
  }
}

InformationsquelleAutor Vikas Godiyal