Android(1)-自定义属性attrs.xml

此文是在上一遍Android(1)-自定义控件(输入框)extendsLinearLayout的基础上改写的，不同的是，在自定义控件中使用自定义属性。

自定义属性是将attrs.xml文件与自定义控件类文件（CustomEditText.java）关联起来，是文件类可以读到xml自定义属性的值。在自定义控件类里面获取到的值（自定义属性）与自定义控件类俩面的android基本控件的值结合。当然，也可以对获取到的值自由的处理。

文件结构：

src:

　　MainActivity.java

　　CustomEditText.java

res:

　　layout

　　　　activity_main.xml

　　　　custom_edittest.xml

　　values

　　　　attrs.xml

代码：

　MainActivity.java

package com.example.testcustomwidget;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageButton;
import android.widget.Toast;

import com.example.widget.CustomEditText;

public class MainActivity extends Activity {

    private CustomEditText cusEdt;
    private ImageButton ibTest;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        findViews();
        attachEvent();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    private void findViews() {
        // TODO Auto-generated method stub
        cusEdt = (CustomEditText)findViewById(R.id.custom_input);
        ibTest = (ImageButton)findViewById(R.id.btnTest);
    }
    
    private void attachEvent() {
        ibTest.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                String strGet = cusEdt.getEditText().getText().toString();
                // TODO Auto-generated method stub
                Toast.makeText(MainActivity.this, "test:" + strGet, Toast.LENGTH_LONG).show();
            }    
        });
    }
    
}

activity_main.xml

xmlns:test="http://schemas.android.com/apk/res/com.example.testcustomwidget" 中的“com.example.testcustomwidget”为R文件目录
同时这句也可以改为:xmlns:ProgressWheel="http://schemas.android.com/apk/res-auto" 

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:test="http://schemas.android.com/apk/res/com.example.testcustomwidget" 
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:background="@drawable/login_bg"
    tools:context=".MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

    <com.example.widget.CustomEditText
        android:id="@+id/custom_input"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="100dp" 
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        test:icon="@drawable/phone_num_icon"
        />

    <ImageButton
        android:id="@+id/btnTest"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/custom_input"
        android:layout_below="@+id/custom_input"
        android:layout_marginTop="43dp"
        android:layout_marginRight="20dp"
        android:contentDescription="@string/hello_world"
        android:background="@drawable/bg_button"
        android:text="@string/hello_world"
         />

</RelativeLayout>

 

CustomEditText.java

package com.example.widget;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.util.Log;
import android.view.LayoutInflater;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;

import com.example.testcustomwidget.R;

public class CustomEditText extends LinearLayout {

    private ImageView ivEdtIcon;
    private EditText edtEdtInput;
    
    public CustomEditText(Context context) {
        super(context);
    }
    
    public CustomEditText(Context context, AttributeSet attrs) {
        super(context, attrs);
        // TODO Auto-generated constructor stub
        init(context);
        initAttr(context, attrs);
    }
    
    private void init(Context context){
        LayoutInflater.from(context).inflate(R.layout.custom_edittext, this);
        ivEdtIcon = (ImageView)findViewById(R.id.edt_icon);
        edtEdtInput = (EditText)findViewById(R.id.edt_input);
    }
    
　　//mark
    private void initAttr(Context context, AttributeSet attrs) {
        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CustomEditText);
        
        Drawable drawable = a.getDrawable(R.styleable.CustomEditText_icon);
        Log.v("msg", drawable + "");
        if(drawable != null)
            ivEdtIcon.setImageDrawable(drawable);
        CharSequence hint = a.getString(R.styleable.CustomEditText_hint);
        if(hint != null)
            edtEdtInput.setHint(hint);
        CharSequence text = a.getString(R.styleable.CustomEditText_text);
        if(text != null)
            edtEdtInput.setText(text);
        //edtEdtInput.setInputType(R.styleable.);
        
        a.recycle();
    }

    public EditText getEditText() {
        return edtEdtInput;
    }
}

custom_edittest.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="horizontal"
    android:background="@android:color/white"
    >
    
    <ImageView 
        android:id="@+id/edt_icon"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:contentDescription="@string/hello_world"
        />
    <EditText
        android:id="@+id/edt_input"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="@string/hello_world"
        />
    
    
</LinearLayout>

 

attrs.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <!-- 自定义属性 -->
    <attr name="icon" format="integer" />
    <attr name="text" format="string" />
    <attr name="hint" format="string" />
    
    <declare-styleable name="CustomEditText">
        <attr name="icon" />
        <attr name="text" />
        <attr name="hint" />
    </declare-styleable>
</resources>

 

简单实现，适合学习！原创：http://www.cnblogs.com/TS-qrt/articles/android_attr.html