Question

我有一组RadioGroup，其中有七个元素，其中每个RadioButton都未选中;我需要知道第一次检查RadioButton的时间（不考虑以下每个更改）。我怎么能这样做？

这是我的尝试：

ratingRadioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener(){
            public void onCheckedChanged(RadioGroup rGroup, int checkedId){
                if(oneRadioButton.isChecked() == false && twoRadioButton.isChecked() == false && 
                        threeRadioButton.isChecked() == false && fourRadioButton.isChecked() == false && 
                        fiveRadioButton.isChecked() == false && sixRadioButton.isChecked() == false &&
                        sevenRadioButton.isChecked() == false && taskEditTextShown == true){
                    lastTime = System.currentTimeMillis();
                }
            }
        });

但是这段代码不起作用。

Answer 1

首先，您似乎错过了@Override Annotation。您必须确保添加此项，因为该方法正在从其超类中重写。

将其更改为以下内容：

ratingRadioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener(){
       // Missing this Line below
       @Override
        public void onCheckedChanged(RadioGroup rGroup, int checkedId)
        {               
          // This Code is not a good Way to do this...
           if((oneRadioButton.isChecked()   == false) &&
              (twoRadioButton.isChecked()   == false) && 
              (threeRadioButton.isChecked() == false) && 
              (fourRadioButton.isChecked()  == false) && 
              (fiveRadioButton.isChecked()  == false) && 
              (sixRadioButton.isChecked()   == false) &&
              (sevenRadioButton.isChecked() == false) && 
              (taskEditTextShown == true))
            {
                lastTime = System.currentTimeMillis();
            }
        }
    });

这是一种更好的方法

相反，我会使用像我刚创建的应用程序那样的东西，它使用switch语句来跟踪RadioGroup的点击。

所以这里充满了我的MainActivity，它首次跟踪无线电组按钮的点击次数，如果再次点击该按钮则重置为0。

public class MainActivity extends Activity {

// Create Some Class Members for handling our actions an UI Elements
private static final String TAG = "MainActivity";

private RadioGroup m_radioFruits        = null;
private RadioButton m_radioApples       = null,
                    m_radioBananas      = null, 
                    m_radioCantaloupe   = null,
                    m_radioPears        = null, 
                    m_radioWatermelon   = null;

private int m_counterApples = 0, 
            m_counterWatermelon = 0, 
            m_counterBananas = 0,
            m_counterCantaloupe = 0,
            m_counterPears = 0;




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

   // Reference the radiogroup and add a OnCheckedChangeListener
    m_radioFruits = (RadioGroup) findViewById(R.id.radioFruits);
    m_radioFruits.setOnCheckedChangeListener(RadioFruitListener);

  // Reference all the UI Elements inside the radioGroup (i.e. all the RadioButtons)
    m_radioApples       = (RadioButton) findViewById(R.id.radioApples);
    m_radioBananas      = (RadioButton) findViewById(R.id.radioBananas);
    m_radioCantaloupe   = (RadioButton) findViewById(R.id.radioCantaloupe);
    m_radioPears        = (RadioButton) findViewById(R.id.radioPears);
    m_radioWatermelon   = (RadioButton) findViewById(R.id.radioWatermelon);

}

  // Not Necessary - Generated By Eclipse
@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

// --------------------------------------------------------------------------
// Listener
OnCheckedChangeListener RadioFruitListener = new OnCheckedChangeListener()
{
         // Missing this before
    @Override
    public void onCheckedChanged(RadioGroup group, int checkedId) 
            {
                    // You can get the Id of the RadioButton this way
        int radioButtonId = group.getCheckedRadioButtonId();

                    // or Something Like
                    // int radioButtonId = checkedId;

                    // ^ --- both give you the same reference 

                    // Log this reference for debugging
        Log.d(TAG, "radioButtonID = "+ Integer.toString(radioButtonId));

                    // --------------- ALL THE ACTION IS HERE -------------------

        switch(radioButtonId)
        {
                   // For each button repeat the steps 1-3
        case R.id.radioApples:
            // 1.  Check the Radio Button
                            m_radioApples.setChecked(true);

            // 2. Increment Counter
            m_counterApples += 1;

                            // 3. See if it has been clicked
            if(m_counterApples > 1)
            {
                                    // if so initialize it to 0 again
                m_counterApples = 0;
            }
            break;
        case R.id.radioBananas:
            m_radioBananas.setChecked(true);

            m_counterBananas += 1;

            if(m_counterBananas > 1)
            {
                m_counterBananas = 0;
            }
            break;
        case R.id.radioCantaloupe:
            m_radioCantaloupe.setChecked(true);

            m_counterCantaloupe += 1;

            if(m_counterCantaloupe > 1)
            {
                m_counterCantaloupe = 0;
            }

            break;
        case R.id.radioPears:
            m_radioPears.setChecked(true);

            m_counterPears += 1;

            if(m_counterPears > 1)
            {
                m_counterPears = 0;
            }
            break;
        case R.id.radioWatermelon:
            m_radioWatermelon.setChecked(true);

            m_counterWatermelon += 1;

            if(m_counterWatermelon > 1)
            {
                m_counterWatermelon = 0;
            }
            break;
        }

        // Prints out the count of each Item everytime a radiobutton is selected
        Log.d(TAG, "CounterApples = "+ Integer.toString(m_counterApples));
        Log.d(TAG, "CounterBananas = "+ Integer.toString(m_counterBananas));
        Log.d(TAG, "CounterCantaloupe = "+ Integer.toString(m_counterCantaloupe));
        Log.d(TAG, "CounterPears = "+ Integer.toString(m_counterPears));
        Log.d(TAG, "CounterWatermelon = "+ Integer.toString(m_counterWatermelon));


    }

};
}

当取消选中RadioGroup中的所有单选按钮时，如何知道RadioGroup的单选按钮的第一次检查

1 个答案: