單擊按鈕時獲取所選單選按鈕的ID

Question

這是我要執行的操作：我有2個活動，一個MainActivity和一個SettingsActivity，單擊MA中的一個按鈕即可打開。 在SA中，有6個單選按鈕，每個單選按鈕在單選組中具有對應的顏色ID（如if / else語句所示），以及一個用於關閉活動的按鈕。 當用戶按下關閉按鈕時，MA的背景將更改為用戶選擇的顏色。 一切正常，除了getCheckedRadioButtonId（）方法獲取創建SettingsActivity時選擇的按鈕的ID（無），因此顯示的顏色始終是最后else塊中的顏色。 我知道這應該是一個非常簡單的修復程序，但是我花了大約4個小時嘗試了所有我能想到的解決方案，而且我的許多google搜索都沒有給我任何有用的信息。以下是相關代碼：

SettingsActivity.java：

public class SettingsActivity extends AppCompatActivity {                                  

    public static final String colorID = "colorID";                                        

    @Override                                                                              
    protected void onCreate(Bundle savedInstanceState) {                                   
        super.onCreate(savedInstanceState);                                                
        setContentView(R.layout.activity_settings);                                        
        LayoutInflater inflater = LayoutInflater.from(SettingsActivity.this);              
        View settingsView= inflater.inflate(R.layout.activity_settings, null);             

    returnToMain();                                                                                                                                                                                                                                    
    }                                                                                      

    public int getColorValueID(View view) {                                                

        final int colorId;                                                                 
          int id;                                                                          

        final RadioGroup radioGroup = (RadioGroup) view.findViewById(R.id.radioGroup);     

                if(radioGroup.getCheckedRadioButtonId()!= -1) {                            
                    id = radioGroup.getCheckedRadioButtonId();                             
                }                                                                          
                else {                                                                     
                    id = 0;                                                                
                }                                                                          

        if (id == R.id.redButton) {                                                        

            colorId = R.color.red_theme;                                                   

        } else if (id == R.id.blueButton) {                                                

            colorId = R.color.blue_theme;                                                  

        } else if (id == R.id.greenButton) {                                               

            colorId = R.color.green_theme;                                                 

        } else if (id == R.id.orangeButton) {                                              

            colorId = R.color.orange_theme;                                                

        } else if (id == R.id.purpleButton) {                                              

            colorId = R.color.purple_theme;                                                

        } else {                                                                           

            colorId = R.color.blue_theme;                                                  

        }                                                                                  

        return colorId;                                                                    
    }                                                                                      

    public void returnToMain(){                                                            
        Button returnButton = (Button) findViewById(R.id.backToMain);                      

        returnButton.setOnClickListener(new View.OnClickListener() {                       
            @Override                                                                      
            public void onClick(View view) {                                               
                LayoutInflater inflater = LayoutInflater.from(SettingsActivity.this);      
                View settingsView= inflater.inflate(R.layout.activity_settings, null);     

                int color = getColorValueID(settingsView);                                 
                final Intent mIntent = new Intent();                                       
                mIntent.putExtra(colorID, color);                                          
                setResult(RESULT_OK, mIntent);                                             
                finish();                                                                  
            }                                                                              
        });                                                                                
    }                                                                                                                                                                              
}                              

activity_settings.xml：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_settings"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.rileybolen.simplemortgagecalculator.SettingsActivity"
    tools:background="#dedede">

    <TextView
        android:text="@string/settings"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:id="@+id/settingsHeading"
        android:textColor="#494949"
        android:textSize="32sp"
        android:textAlignment="center"
        />

    <RadioGroup
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/themeHeading"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="10dp"
        android:id="@+id/radioGroup">

                <RadioButton
                    android:text="Orange"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:id="@+id/orangeButton"
                    android:layout_alignParentTop="true"
                    android:textColor="@color/orange_theme"
                    android:textSize="18sp"
                    android:layout_marginLeft="20dp"
                    />

                <RadioButton
                    android:text="Purple"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:id="@+id/purpleButton"
                    android:layout_below="@id/orangeButton"
                    android:textColor="@color/purple_theme"
                    android:textSize="18sp"
                    android:layout_marginLeft="20dp"/>

                <RadioButton
                    android:text="Grey"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:id="@+id/greyButton"
                    android:layout_below="@id/purpleButton"
                    android:textColor="#494949"
                    android:textSize="18sp"
                    android:layout_marginLeft="20dp"/>


                <RadioButton
                    android:text="Red"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:id="@+id/redButton"
                    android:layout_alignParentTop="true"
                    android:textColor="@color/red_theme"
                    android:textSize="18sp"
                    android:layout_marginLeft="20dp"/>

                <RadioButton
                    android:text="Blue"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:id="@+id/blueButton"
                    android:layout_below="@id/redButton"
                    android:textColor="@color/blue_theme"
                    android:textSize="18sp"
                    android:layout_marginLeft="20dp"/>

                <RadioButton
                    android:text="Green"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:id="@+id/greenButton"
                    android:layout_below="@id/blueButton"
                    android:textColor="@color/green_theme"
                    android:textSize="18sp"
                    android:layout_marginLeft="20dp"/>


    </RadioGroup>

    <TextView
        android:text="@string/theme_heading"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="28dp"
        android:id="@+id/themeHeading"
        android:textColor="#494949"
        android:textSize="24sp"
        android:layout_below="@+id/settingsHeading"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"/>



        <Button
            android:text="Close"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/backToMain"
            android:layout_alignParentBottom="true"
            />


</RelativeLayout>

Answer 1

在您的RadioGroup上注冊一個onCheckedChanged(RadioGroup group, int checkedId)偵聽器

radioGroup.setOnCheckedChangedListener(new OnCheckChangedListener(){
public void onCheckedChanged(RadioGroup group, int checkedId) {

}

});

像這樣