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有人会好心建议为什么OnKey()方法中的代码没有执行。请注意,我试图触发这个,我点击了android键盘上的“搜索”按钮。OnKeyListener()没有执行
下面是主要代码:
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;
}
};
}
我尝试添加以下代码块作为建议的修复,但它并没有帮助:
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");;
}
};
}
这里是我的布局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>
任何建议,非常感谢!
这是第一个实现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;
}
});
}
}
这里的修复程序在我的评论中提到的双触发问题:
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;
}
});
}
特德,谢谢你的建议,它现在只工作,现在看来我的代码在onKey()正在执行两次。能想到这个的任何原因吗? 再次非常感谢您的帮助。 – Ben
特德,解决了双重触发问题(请参阅我上面的代码)。再次感谢您的帮助! – Ben