android界面小程序

package com.example.activity_edittext;

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 MainActivity extends Activity {
    private TextView mTextView1,mTextView2;
    private EditText mEditText1,mEditText2;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		//获取还需要放在下面的;
		mTextView1 = (TextView)findViewById(R.id.mTextView1);
		mTextView2 = (TextView)findViewById(R.id.mTextView2);
		
		mEditText1 = (EditText)findViewById(R.id.mEditText1);
		mEditText2 = (EditText)findViewById(R.id.mEditText2);
		
		mTextView1.setText("账号内容是：");
		mTextView2.setText("密码内容是：");
		
		mEditText1.setHint("请输入账号");
		mEditText2.setHint("请输入密码");
		
		mEditText1.setOnKeyListener(new EditText.OnKeyListener()
		{

			@Override
			public boolean onKey(View arg0, int arg1, KeyEvent arg2) {
				//得到文字，将其显示在TextView当中
				mTextView1.setText("账号内容是："+mEditText1.getText().toString());
				return false;
			}
			
		});
		
		
		mEditText2.setOnKeyListener(new EditText.OnKeyListener()
		{

			@Override
			public boolean onKey(View arg0, int arg1, KeyEvent arg2) {
				//得到文字，将其显示在TextView当中
				mTextView2.setText("密码内容是："+mEditText2.getText().toString());
				return false;
			}
			
		});
	}
}

当在文本编辑框中输入内容之后，按下回车键就会发现TextView发生了变化。