2011-09-18 63 views
2

有人會好心建議爲什麼OnKey()方法中的代碼沒有執行。請注意,我試圖觸發這個,我點擊了android鍵盤上的「搜索」按鈕。OnKeyListener()沒有執行

下面是主要代碼:

package com.onkeyexample1; 

import android.app.Activity; 
import android.os.Bundle; 
import android.text.Editable; 
import android.text.TextWatcher; 
import android.util.Log; 
import android.view.KeyEvent; 
import android.view.View; 
import android.view.View.OnKeyListener; 
import android.widget.EditText; 

public class OnKeyExample1Activity extends Activity { 
EditText editText; 
OnKeyListener onKeyListener; 
/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
    editText = (EditText) findViewById(R.id.editText1); 
    editText.setOnKeyListener(onKeyListener); 
    editText.addTextChangedListener(inputTextWatcher); 

onKeyListener = new OnKeyListener() { 
    @Override 
    public boolean onKey(View v, int keyCode, KeyEvent event) { 
      System.out.println("Clicked"); 
     return true; 
       } 
    }; 
} 

我嘗試添加以下代碼塊作爲建議的修復,但它並沒有幫助:

private TextWatcher inputTextWatcher = new TextWatcher() { 
     public void afterTextChanged(Editable s) { } 
     public void beforeTextChanged(CharSequence s, int start, int count, int after) 
      { } 
     public void onTextChanged(CharSequence s, int start, int before, int count) { 
      // Log.d(TAG, s.charAt(count-1) + " character to send");;   
     } 
    }; 
} 

這裏是我的佈局XML:

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    > 
<TextView 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello" 
    /> 
<EditText android:imeOptions="actionSearch" android:layout_width="fill_parent" 
    android:id="@+id/editText1" android:layout_height="wrap_content"> 
    <requestFocus></requestFocus> 
</EditText> 
</LinearLayout> 

任何建議,非常感謝!

這是第一個實現Ted的暗示:

public class OnKeyExample1Activity extends Activity { 
EditText editText; 
OnKeyListener onKeyListener; 
/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
    editText = (EditText) findViewById(R.id.editText1); 
editText.setOnKeyListener(onKeyListener = new OnKeyListener() { 
    @Override 
    public boolean onKey(View v, int keyCode, KeyEvent event) { 
      System.out.println("Clicked"); 
     return true; 
       } 
}); 
} 
} 

這裏的修復程序在我的評論中提到的雙觸發問題:

editText.setOnKeyListener(onKeyListener = new OnKeyListener() { 
    @Override 
    public boolean onKey(View v, int keyCode, KeyEvent event) { 
     if (event.getAction() != KeyEvent.ACTION_DOWN) { 
      System.out.println("Argh"); 
      return false; 
     } 
     return true; 
    } 
}); 
} 

回答

2

您需要在之前的值賦給onKeyListener請致電editText.setOnKeyListener(onKeyListener);。只需在方法調用之前移動任務,它就可以工作。

+0

特德,謝謝你的建議,它現在只工作,現在看來我的代碼在onKey()正在執行兩次。能想到這個的任何原因嗎? 再次非常感謝您的幫助。 – Ben

+0

特德,解決了雙重觸發問題(請參閱我上面的代碼)。再次感謝您的幫助! – Ben