Android錯誤 - 使用分離Listner類

我是新來的android編程，我正在做一個程序，當按鈕或單選按鈕被按下時，改變textview的顏色。甚至我正在爲此編寫一個單獨的Listner類。現在，在活動和列表器類和活動中，它都顯示錯誤。我的活動類和Listner類已在此處駐留Android錯誤 - 使用分離Listner類

主要活動錯誤顯示在所有按鈕中和ColorSetter(b1.setOnClickListener(new ColorSetter(Color.RED, this));

public class MainActivity extends Activity { 

    private View mColorRegion; 

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

    mColorRegion = findViewById(R.id.color_region); 
    Button b1 = (Button)findViewById(R.id.button1); 
    Button b2 = (Button)findViewById(R.id.button2); 
    Button b3 = (Button)findViewById(R.id.button3); 

      RadioButton r1 = (RadioButton)findViewById(R.id.radio_button1); 
      RadioButton r2 = (RadioButton)findViewById(R.id.radio_button2); 
      RadioButton r3 = (RadioButton)findViewById(R.id.radio_button3); 

      b1.setOnClickListener(new ColorSetter(Color.RED, this)); 
      b2.setOnClickListener(new ColorSetter(Color.BLUE, this)); 
      b3.setOnClickListener(new ColorSetter(Color.YELLOW, this)); 
      r1.setOnClickListener(new ColorSetter(Color.RED, this)); 
      r2.setOnClickListener(new ColorSetter(Color.BLUE, this)); 
      r3.setOnClickListener(new ColorSetter(Color.YELLOW, this)); 

    } 

    public void setRegionColor(int color) { 
    mColorRegion.setBackgroundColor(color); 
    } 
}

口糧按鈕聽者-PLZ講解如何寫這個seprate聽者

public class ColorSetter implements OnClickListener { 

private int regionColor; 
private Events1Example mainActivity; 
public ColorSetter(int regionColor,Events1Example mainActivity) { 
     this.regionColor = regionColor; 
     this.mainActivity = mainActivity; 
     } 

@Override 
public void onClick(View arg0) { 
    // TODO Auto-generated method stub 

    mainActivity.setRegionColor(regionColor); 

} 

}

來源

2014-03-05 user3041524

你[R什麼錯誤gettig？ – rajshree

你能試着解釋你想達到的目標嗎？ – Blackbelt

@ user3041524我發佈了示例代碼，如果它不可理解，請讓我知道 – VenushkaT

我希望這是你預料。檢查這種類型的代碼。

public class MainActivity extends Activity { 

private View mColorRegion; 

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

    mColorRegion = findViewById(R.id.color_region); 
    Button b1 = (Button)findViewById(R.id.button1); 
    Button b2 = (Button)findViewById(R.id.button2); 
    Button b3 = (Button)findViewById(R.id.button3); 

    RadioButton r1 = 
      (RadioButton)findViewById(R.id.radio_button1); 
      RadioButton r2 = 
      (RadioButton)findViewById(R.id.radio_button2); 
      RadioButton r3 = 
      (RadioButton)findViewById(R.id.radio_button3); 

      b1.setOnClickListener(new ColorSetter(Color.RED, this)); 
      b2.setOnClickListener(new ColorSetter(Color.BLUE, this)); 
      b3.setOnClickListener(new ColorSetter(Color.YELLOW, this)); 
      r1.setOnClickListener(new ColorSetter(Color.RED, this)); 
      r2.setOnClickListener(new ColorSetter(Color.BLUE, this)); 
      r3.setOnClickListener(new ColorSetter(Color.YELLOW, this)); 

} 
public void setRegionColor(int color) { 
    mColorRegion.setBackgroundColor(color); 
} 
} 


Button.OnClickListener btnOnClickListener=new Button.OnClickListener() 
       { 

       @Override 
       public void onClick(View v) { 




        if(v==b1) 
        { 

         //b1 code goes here 

        } 
        else if(v==cb2) 
        { 
         //b2 code goes here 
        } 


       };

來源

2014-03-05 08:49:22 VenushkaT

改變這種

private Events1Example mainActivity; 
public ColorSetter(int regionColor,Events1Example mainActivity) {

到

private MainActivity mainActivity; 
public ColorSetter(int regionColor,MainActivity mainActivity) {

來源

2014-03-05 08:55:06

Android錯誤 - 使用分離Listner類

回答

相關問題