单击以启用 Java Android 开发中的按钮时，如何处理两个复选框？

Question

I am going to design my app in android. And I facing a problem about in a registration when I have two checkbox. When two checkbox is clicked, and the button will be enable and can be clicked to go to next activity. Here are my script.

private static final String TAG_Clicked = "TagClicked";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_term_signup);

    CheckBox checkBoxTOS = (CheckBox) findViewById(R.id.checkBox_termsOfService);
    CheckBox checkBoxPNP = (CheckBox) findViewById(R.id.checkBox_privacy_policy);
    Button buttonNext = (Button) findViewById(R.id.btn_next);


    checkBoxTOS.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            if (isChecked){
                checkBoxTOS.isChecked();
                Log.d(TAG_Clicked,"Agreed TOS "+isChecked);
            }
        }
    });
    checkBoxPNP.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            if (isChecked){
                checkBoxPNP.isChecked();
                Log.d(TAG_Clicked,"Agreed PNP "+isChecked);
            }
        }
    });
    if ((checkBoxTOS.isChecked() == true) && (checkBoxPNP.isChecked() == true)){
        buttonNext.setEnabled(true);
        Log.d(TAG_Clicked,"A");
    } else {
        buttonNext.setEnabled(false);
        Log.d(TAG_Clicked,"B");
    }
}

Answer 1

You can have a counter of checked boxes and manage the button state by comparing the count. For example:

      private static final String TAG_Clicked = "TagClicked";
      private int counter = 0;

      @Override
      protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_term_signup);

        CheckBox checkBoxTOS = (CheckBox) findViewById(R.id.checkBox_termsOfService);
        CheckBox checkBoxPNP = (CheckBox) findViewById(R.id.checkBox_privacy_policy);
        Button buttonNext = (Button) findViewById(R.id.btn_next);

        checkBoxTOS.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
          @Override
          public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            if (isChecked) {
              counter++;
              checkBoxTOS.isChecked();
              Log.d(TAG_Clicked, "Agreed TOS " + isChecked);
            } else {
              counter--
            }
            manageButtonState(counter);
          }
        });
        checkBoxPNP.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
          @Override
          public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            if (isChecked) {
              counter++;
              checkBoxPNP.isChecked();
              Log.d(TAG_Clicked, "Agreed PNP " + isChecked);
            } else {
              counter--;
            }
            manageButtonState(counter);

          }
        });

      }

      private void manageButtonState(int counter) {
        buttonNext.setEnabled(counter > 1)
      }

Answer 2

    checkBoxTOS.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        if (isChecked && checkBoxPNP.isChecked()){
           buttonNext.setEnabled(false);
            Log.d(TAG_Clicked,"Agreed TOS "+isChecked);
        }
        else
           buttonNext.setEnabled(true);
    }
});


checkBoxPNP.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        if (isChecked && checkBoxTOS.isChecked()){
            Log.d(TAG_Clicked,"Agreed PNP "+isChecked);
            buttonNext.setEnabled(false);
        }
        else
            buttonNext.setEnabled(true);
    }
});

Answer 3

You have to check Button should enabled or not after check state change of both ChecxBox

Below code should execute after each time both checkbox check state is changed.

if ((checkBoxTOS.isChecked() == true) && (checkBoxPNP.isChecked() == true)){
    buttonNext.setEnabled(true);
    Log.d(TAG_Clicked,"A");
} else {
    buttonNext.setEnabled(false);
    Log.d(TAG_Clicked,"B");
}

Move this code in a method and call that method after CheckBox check state change

void changeButtonState(){
  if (checkBoxTOS.isChecked() && checkBoxPNP.isChecked() ){
      buttonNext.setEnabled(true);
      Log.d(TAG_Clicked,"A");
  } else {
      buttonNext.setEnabled(false);
      Log.d(TAG_Clicked,"B");
  }
}

Call this method form check change listener call back

checkBoxTOS.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        changeButtonState();
    }
});
checkBoxPNP.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        changeButtonState();
    }
});

Answer 4

  checkBoxTOS.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
         //will called when you select or deselect
            enableOrDisableButton();
        }
    });
    checkBoxPNP.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {                
       //will called when you select or deselect
            enableOrDisableButton();
        }
    });

public void enableOrDisableButton(){
    if ((checkBoxTOS.isChecked() == true) && (checkBoxPNP.isChecked() == true)){
        buttonNext.setEnabled(true);
        Log.d(TAG_Clicked,"A");
    } else {
        buttonNext.setEnabled(false);
        Log.d(TAG_Clicked,"B");
    }}