呼叫从SimpleOnGestureListener

Question

活动的功能我有一个自定义画布主要活动：

public void onCreate(Bundle savedInstanceState) { 
     ... 
     CustomCanvas c = new CustomCanvas(this); 
     c.requestFocus(); 
     cll = (LinearLayout)findViewById(R.id.CLL); 
     cll.addView(c); 
    } 

    public void qwerty(String w) { 
     .... 
     TextView abc = (TextView)findViewById(R.id.TextViewabc); 
     abc.setText(w); 
     .... 
    } 

里面CustomCanvas，我有一个SimpleOnGestureListener GestureDetector。 我想从SimpleOnGestureListener的方法（如onSingleTapConfirmed）调用qwerty（）

这可能吗？如果不是，还有另外一种方式吗？ 感谢

....编辑.....（详细信息）

GestureDetector是一个对象，我CustomCanvas

public class CustomCanvas extends View { 

    GestureDetector gd; 
    ... 

    public CustomCanvas(final Context context) { 
     super(context); 

     gd = new GestureDetector(getContext(), new SimpleOnGestureListener() { 
      .... 
      // I also use getScrollX() and getScrollY() in some of the methods here 
     }); 
    } 

    .... 

    @Override 
    public boolean onTouchEvent(MotionEvent ev) { 
     return gd.onTouchEvent(ev); 
    } 
} 

Answer 1

你有两种选择。您可以在Activity中实现SimpleOnGestureListener，并将其设置为CustomCanvas，或者将Activity传递给CustomCanavas，以便您可以从CustomCanvas类中的侦听器调用qWerrty（）。

UPDATE

public class CustomCanvas extends View { 

    GestureDetector gd; 
    YourActivity mYourActivity; 
    ... 

    public CustomCanvas(final Context context) { 
     super(context); 

     gd = new GestureDetector(getContext(), new SimpleOnGestureListener() {     
       public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY){ 
        // this implementation makes no sense 
        if(mYourActivity != null){ 
        mYourActivity.qwerty(); 
        }  
       }  
     }); 
    } 

    public setActivity(YourActivity activity){ 
     mYourActivity = activity; 
    } 
} 

在你的活动类，你必须将活动传递给CustomCanvas。

public class YourActivity { 

    public void onCreate(Bundle savedInstanceState) { 
     ... 
     CustomCanvas c = new CustomCanvas(this); 

     // pass the activity to the canvas 
     c.setActivity(this); 

     c.requestFocus(); 
     cll = (LinearLayout)findViewById(R.id.CLL); 
     cll.addView(c); 
    } 

    public void qwerty(String w) { 
     .... 
     TextView abc = (TextView)findViewById(R.id.TextViewabc); 
     abc.setText(w); 
     .... 
    } 
}