四_1.TextView与EditView_setOnkeyListener事件

4_1.TextView与EditView_setOnkeyListener事件

本范例以EditView与TextView示范如何在捕捉User键盘输入文字的时实时取得文字，同步显示于Textview,实时输入输出。

package com.chaowen;

import android.app.Activity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

public class Ex04_01 extends Activity {
    /** Called when the activity is first created. */
	private TextView mTextView;
	private EditText mEditText;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        mTextView=(TextView)findViewById(R.id.myTextView);
        mEditText=(EditText)findViewById(R.id.myEditText);
        //设置EditText用onkeyListener来启动
        mEditText.setOnKeyListener(new EditText.OnKeyListener(){

			@Override
			public boolean onKey(View v, int keyCode, KeyEvent event) {
				mTextView.setText(mEditText.getText().toString());
				return false;
			}
        	
        });
    }
}

 

 

  //main.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:id="@+id/myEditText"
  android:layout_width="149px"
  android:layout_height="wrap_content"
  android:textSize="18sp"
  android:layout_x="29px"
  android:layout_y="33px"
  />
  
<TextView
   android:id="@+id/myTextView"
   android:layout_width="135px"
   android:layout_height="41px"
   android:layout_x="33px"
   android:layout_y="106px"
   />
   

</LinearLayout>