Android常用UI組件 - EditText

EditText是接受用戶輸入信息的最重要Android UI組件，可以利用EditText.getText()獲取它的文本內容。

實例：EditTextDemo
運行效果：

代碼清單：
佈局文件：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="用戶名稱："
        />
        <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="用戶密碼："
        />

        <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="登錄" 
        />
    </TableRow>
</TableLayout>

Java源代碼文件：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, "用戶名稱：" + username.getText() 
                    + ", 用戶密碼：" + password.getText(),Toast.LENGTH_SHORT).show();
            }
        };
        
        btn_login = (Button)findViewById(R.id.login);
        btn_login.setOnClickListener(listener_login);
    }
}

API知識點
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.