阅读《Android 从入门到精通》——编辑框

Posted 2023-01-12 SweetLoverFT

编辑框（EditText）

EditText 类是 TextView 的子类，同时 EditText 类又派生出两个子类 AutoCompleteTextView 和 ExtractEditText。层次关系如下：

java.lang.Object;
android.view.View;
android.widget.TextView;
android.widget.EditText;
AutoCompleteTextView 和 ExtractEditText

EditText 类方法

EditText(context);
EditText(context, attrs);
EditText(context, attrs, defStyle);
public void extendSelection(int index);
public void selectAll();
public void setEllipsize(TextUtils.TruncateAt ellipsis);
public void setSelection(int index);
public void setSelection(int start, int stop);
public void getDefaultSize(int size, int measureSpec);
protected MovementMethod getDefaultMovementMethod();

以上方法均是自身方法，下面给出其他常用方法

EditText 布局

EditText 示例

完整工程：http://download.csdn.net/detail/sweetloveft/9385096
下述程序，主要作用是了解 EditText 的用法。
重点注意：EditText 中的 OnEditorAction 需要注意只有在输入 Enter 后才会被触发！

1.MainActivity.java

package com.sweetlover.activity;

import com.sweetlover.edittextdemo.R;

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

public class MainActivity extends Activity 

	@Override
	protected void onCreate(Bundle savedInstanceState) 
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		EditText editPhone = (EditText)findViewById(R.id.ET_phonenumber);
		EditText editPassword = (EditText)findViewById(R.id.ET_password);
		// 在内部类的其他方法中不可以引用本类中的非 final 变量
		final TextView text = (TextView)findViewById(R.id.myTextView);
		
		editPhone.setOnEditorActionListener(new OnEditorActionListener() 
			
			@Override
			public boolean onEditorAction(TextView v, int actionId, KeyEvent event) 
				// TODO Auto-generated method stub
				text.setText("Editing phone number");
				return false;
			
		);
		
		editPassword.setOnEditorActionListener(new OnEditorActionListener() 
			
			@Override
			public boolean onEditorAction(TextView v, int actionId, KeyEvent event) 
				// TODO Auto-generated method stub
				text.setText("Editing password");
				return false;
			
		);
	

2.activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    
    <TextView
        android:id="@+id/myTextView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium" />
    
    <EditText
        android:id="@+id/ET_phonenumber"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:maxLength="40"
        android:hint="@string/phone_number"
        android:textColorHint="@color/BLACK"
        android:inputType="phone"
        android:imeOptions="actionGo"/>

    <EditText
        android:id="@+id/ET_password"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:maxLength="40"
        android:hint="@string/password"
        android:textColorHint="@color/BLACK"
        android:inputType="textPassword"
        android:imeOptions="actionSearch"/>
    
</LinearLayout>

3.color.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    
    <color name="BLACK">#FF000000</color>
    
</resources>

4.string.xml

<resources>

    <string name="app_name">EditTextDemo</string>
    <string name="phone_number">Phone Number</string>
    <string name="password">Password</string>

</resources>

5.AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.sweetlover.edittextdemo"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="19" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity android:name="com.sweetlover.activity.MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>
    </application>

</manifest>