Android经常使用UI包裹

EditText的信息接受用户输入是最重要的Android UI包裹，您可以使用EditText.getText()获取它的文本内容。

实例：EditTextDemo
执行效果：

代码清单：
布局文件：main.xml

<?xml version="1.0" encoding="utf-8"?
>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:stretchColumns="1"
    >
    <TableRow>
        <TextView
            android:gravity="right"
            android:textStyle="bold"
            android:padding="3dip"
            android:text="用户名称："
        />
        <EditText 
            android:id="@+id/username"
            android:padding="3dip"
            android:scrollHorizontally="true"
        />
    </TableRow>
    <TableRow>
        <TextView
            android:gravity="right"
            android:textStyle="bold"
            android:padding="3dip"
            android:text="用户密码："
        />

        <EditText 
            android:id="@+id/password"
            android:padding="3dip"
            android:password="true"
        />
    </TableRow>
    <TableRow android:gravity="right">
        <Button
            android:id="@+id/cancel"
            android:text="取消" 
        />
        <Button
            android:id="@+id/login"
            android:text="登录" 
        />
    </TableRow>
</TableLayout>

Java源码文件：MainActivity.java

package com.rainsong.edittextdemo;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity
{
    Button btn_login;

    OnClickListener listener_login;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        listener_login = new OnClickListener() {
            public void onClick(View v) {
                EditText username = (EditText) findViewById(R.id.username);
                EditText password = (EditText) findViewById(R.id.password);
                Toast.makeText(MainActivity.this, "用户名称：" + username.getText() 
                    + ", 用户密码：" + password.getText(),Toast.LENGTH_SHORT).show();
            }
        };
        
        btn_login = (Button)findViewById(R.id.login);
        btn_login.setOnClickListener(listener_login);
    }
}

API知识点
android.widget.EditText
public class
EditText
extends TextView

Known Direct Subclasses
AutoCompleteTextView, ExtractEditText, SearchEditText

Known Indirect Subclasses
MultiAutoCompleteTextView

Class Overview
EditText is a thin veneer over TextView that configures itself to be editable.

Public Constructors
EditText(Context context)
EditText(Context context, AttributeSet attrs)
EditText(Context context, AttributeSet attrs, int defStyleAttr)
EditText(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes)

Editable getText()
Return the text the TextView is displaying.

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