Android常用UI組件 - EditText

標籤：android   edittext   

EditText是接受使用者輸入資訊的最重要Android UI組件，可以利用EditText.getText()擷取它的常值內容。

執行個體：EditTextDemo
運行效果：

代碼清單：
布局檔案：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="使用者名稱稱："        />        <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="使用者密碼："        />        <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="登入"         />    </TableRow></TableLayout>

Java原始碼檔案：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, "使用者名稱稱：" + username.getText()                     + ", 使用者密碼：" + 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.

Android常用UI組件 - EditText