誤差EDITTEXT setOnFocusChangeListener

Question

試圖通過

mMessageBox.setOnFocusChangeListener(new OnFocusChangeListener() { 

    @Override 
    public void onFocusChange(View v, boolean hasFocus) { 
     // TODO Auto-generated method stub 

    } 
}); 

使用setOnFocusChangeListener但是當我使用的onCreate功能月食這個功能可以使誤差

Multiple markers at this line 
    - The method setOnFocusChangeListener(View.OnFocusChangeListener) in the type View is not applicable for the arguments (new 
    OnFocusChangeListener(){}) 
    - OnFocusChangeListener cannot be resolved to a type 

難道是因爲我在用最小的SDK的清單文件？清單文件我的SDK選項是

<uses-sdk 
    android:minSdkVersion="9" 
    android:targetSdkVersion="17" /> 

Answer 1

編譯器已經說明了

new View.OnFocusChangeListener() { 
... 
} 

重點是View。