Android Check box Group

问题:

I'm trying to apply some kind of validation on a group of check boxes (e.g. Two contradictory items cannot be checked together) so I want to somehow group Check Box objects and apply something like RequiredFieldValidator on the whole group once and in that validator I will register listeners and do the whole check on my Check Boxes objects.

What I imagine would be a code that look like that:

CheckBoxView allMyCheckBoxes = new CheckBoxView(checkbox1,checkbox2,checkbox3); //varargs
validate(allMyCheckBoxes);

Validate will contain the logic of contradictory check boxes and everything.

Is that already implemented somewhere in Android? If not, anybody tried out something like that? (Hopefully share it with us here)

回答1:

This logic will allow to select one and more checkbox

 private Checkbox day = (checkbox)findviewbyid(R.id.day);
 private Checkbox night =(checkbox)findviewbyid(R.id.night);

 day.setOnCheckedChangeListener(new OnCheckedChangeListener() {

    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        if (!night.isChecked() && !day.isChecked()) {
            night.setChecked(true);
        }

    }
});
night.setOnCheckedChangeListener(new OnCheckedChangeListener() {

    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        if (!day.isChecked() && !night.isChecked()) {
            day.setChecked(true);
        }

    }
});

回答2:

Here is what I did. Not sure if this will work for you but its something you could use as a start. My check boxes I don't need any on check listeners, but you could add them to each one if you'd like

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    private CheckBox chk1, chk2, chk3;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    chk1 = (CheckBox) findViewById(R.id.checkbox1);
    chk2 = (CheckBox) findViewById(R.id.checkbox2);
    chk3 = (CheckBox) findViewById(R.id.checkbox3);
    if (chk1.isChecked()) {
        chk1.setChecked(false);
    }
        else if(chk2.isChecked()){
          chk2.setChecked(false);
         }
    else {
        chk3.setChecked(false);
    }
    chk1.setOnClickListener(this);
    chk2.setOnClickListener(this);
    chk3.setOnClickListener(this);
    }

    @Override
    public void onClick(View view) {
    switch(view.getId()){
        case R.id.checkbox1:
        chk1.setChecked(true);
        chk2.setChecked(false);
        chk3.setChecked(false);
        break;
        case R.id.checkbox2:
        chk2.setChecked(true);
        chk3.setChecked(false);
        chk1.setChecked(false);
        break;
        case R.id.checkbox3:
        chk3.setChecked(true);
        chk2.setChecked(false);
        chk1.setChecked(false);
        break;
    }
    }
}

回答3:

You could use Radio Buttons and set up different groups of them.

This documentation and This tutorial should help you out if you find that Radio Buttons are the way to go.

回答4:

Another Tip.

This way can register listener simply.

private CheckBox[] chkBoxs;
private Integer[] chkBoxIds = {R.id.a, R.id.b, R.id.c .....};

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    chkBoxs = new CheckBox[chkBoxIds.length];
    for(int i = 0; i < chkBoxIds.length; i++) {
        chkBoxs[i] = (CheckBox) findViewById(chkBoxIds[i]);
        chkBoxs[i].setOnCheckedChangeListener(this);
    }

}

回答5:

Best way to do validation on checkboxes similar to radio Buttons

 // Implements your activity     
 CompoundButton.OnCheckedChangeListener 
 // Declare global variables
private CheckBox cbDriver, cbPickDrop;
private String strCB;

// Bind components and set listeners in onCreate()
cbDriver = (CheckBox) findViewById(R.id.driverCB);
cbPickDrop = (CheckBox) findViewById(R.id.pickDropCB);
cbDriver.setOnCheckedChangeListener(this);
cbPickDrop.setOnCheckedChangeListener(this);


// write this method inside your activity
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
    switch (buttonView.getId()){
        case R.id.driverCB:
            if (isChecked) {
                cbPickDrop.setChecked(false);
                strCB = cbDriver.getText().toString();
                DialogManager.showToast(MyActivity.this, strCB);
            }
            break;
        case R.id.pickDropCB:
            if (isChecked) {
                cbDriver.setChecked(false);
                strCB = cbPickDrop.getText().toString();
                DialogManager.showToast(MyActivity.this, strCB);
            }
            break;
    }

}