How to validate which checkbox is checked?

问题

I am new to android ,Here I have 7 check boxes in my application and I have customized it as in the image .Each checkbox is represents a day of the week .

What I want to do is ,If a user clicked on a checkbox the text of the clicked checkbox should appear on the above TextView (by default if there is any checkbox is not clicked Textview text should be as "Never").

Here the Textview text should be in a ordered way ,I mean If I select all the check boxes randomly but the TextView text should be in a ordered way like Sun,Mon,.....Sat.

I know how to validate a checkbox is checked or not ,but When it comes to the above situation I don't know how it should be .

Can anyone help me to get this .

  private TreeMap<Integer, String> mAlarmDays = new TreeMap<>();

 public void onClick(View v) {
        switch (v.getId()) {
            case R.id.mSun:
                if (mRepeat.getText().toString().contains("Sun")) {
                    mAlarmDays.remove(0);
                    Toast.makeText(getApplicationContext(),"Sun is clicked",Toast.LENGTH_LONG).show();
                } else
                    mAlarmDays.put(0, "Sun");
                break;
            case R.id.mMon:
                if (mRepeat.getText().toString().contains("Mon")) {
                    mAlarmDays.remove(1);
                } else
                    mAlarmDays.put(1, "Mon");
                break;
            case R.id.mTue:
                if (mRepeat.getText().toString().contains("Tue")) {
                    mAlarmDays.remove(2);
                } else
                    mAlarmDays.put(2, "Tue");
                break;
            case R.id.mWed:
                if (mRepeat.getText().toString().contains("Wed")) {
                    mAlarmDays.remove(3);
                } else
                    mAlarmDays.put(3, "Wed");
                break;
            case R.id.mThu:
                if (mRepeat.getText().toString().contains("Thu")) {
                    mAlarmDays.remove(4);
                } else
                    mAlarmDays.put(4, "Thu");
                break;
            case R.id.mFri:
                if (mRepeat.getText().toString().contains("Fri")) {
                    mAlarmDays.remove(5);
                } else
                    mAlarmDays.put(5, "Fri");
                break;
            case R.id.mSat:
                if (mRepeat.getText().toString().contains("Sat")) {
                    mAlarmDays.remove(6);
                } else
                    mAlarmDays.put(6, "Sat");
                break;
        }
        StringBuilder repeatDays = new StringBuilder();
        if (mAlarmDays.size() == 0) {
            repeatDays = new StringBuilder("Never");
        } else {
            for (String day:mAlarmDays.values()) {
                repeatDays.append(day).append(" ");
            }
        }
        mRepeat.setText(repeatDays.toString());
    }

回答1:

I suggest to create one checkbox listener for all checkboxes which will iterate over them and build string for textview

Something like this:

CheckBox sunday = ...;
CheckBox monday = ...;
//......
CheckBox saturday = ...;
TextView label = ...;

CompoundButton.OnCheckedChangeListener changeListener = new CompoundButton.OnCheckedChangeListener() {
    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        List<String> days = new ArrayList<>();
        if (sunday.isChecked()) {
            days.add("Sun");
        }
        if (monday.isChecked()) {
            days.add("Mon");
        }
        //....
        if (saturday.isChecked()) {
            days.add("Sat");
        }
        if (days.size() != 0) {
            label.setText(TextUtils.join(", ", days));
        } else {
            label.setText("Never");
        }
    }
};

sunday.setOnCheckedChangeListener(changeListener);
monday.setOnCheckedChangeListener(changeListener);
//......
saturday.setOnCheckedChangeListener(changeListener);

回答2:

It really depends how you have the text set... but you can do something like.

if (checkBox.isChecked()) {
    System.out.println("checkBox clicked");
}

回答3:

try this for every checkbox.

 CheckBox checkBox = (CheckBox)v;
      if(checkBox.isChecked()){
          Log.i("Checkbox", "Checkbox selected.");
    }else{
         Log.i("Checkbox", "Checkbox Not selected.");
    }

来源：https://stackoverflow.com/questions/51064472/how-to-validate-which-checkbox-is-checked