Android布局文件.xml中的自定义属性

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.cctvjiatao.xmlset"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="14"
        android:targetSdkVersion="21" />

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

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

com.cctvjiatao.xmlset.MainActivity

package com.cctvjiatao.xmlset;

import android.app.Activity;
import android.os.Bundle;

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
	}
}

activity_main.xml

<pre name="code" class="html"><!--
 xmlns:jiatao="http://schemas.android.com/apk/res/com.cctvjiatao.xmlset"
 xmlns:[自定义命名] = "http://schemas.android.com/apk/res/[本xml所属activity的包名]"
-->
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:juan="http://schemas.android.com/apk/res/com.cctvjiatao.xmlset"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.cctvjiatao.xmlset.MainActivity" >

    <!-- 一定要写正确自定义View的“包名+类名”，不然汇报错：Binary XML file line #14: Error inflating class.. -->

    <com.cctvjiatao.xmlset.TestView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        juan:Scroll="true"
        juan:Lines="10" >
    </com.cctvjiatao.xmlset.TestView>

</RelativeLayout>

com.cctvjiatao.xmlset.TestView

<pre name="code" class="java">package com.cctvjiatao.xmlset;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.View;

/**
 * @作者： jiatao
 * @修改时间：2016-3-12 下午10:20:43 
 * @包名：com.cctvjiatao.xmlset
 * @文件名：CustomView.java
 * @版权声明：www.cctvjiatao.com
 * @功能： 普通的自定义View
 */
public class TestView extends View {
	
	private int LinesNum = 0;
	private boolean isScroll = false;
	private Paint paint = new Paint();
	private ViewThread thread;
	private float xStart = 0;
	

	public TestView(Context context) {
		super(context);
	}

	public TestView(Context context, AttributeSet attrs) {
		super(context, attrs);
		TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.JiataoCustom);
		LinesNum = ta.getInt(R.styleable.JiataoCustom_Lines, 1);
		isScroll = ta.getBoolean(R.styleable.JiataoCustom_Scroll, false);
		ta.recycle();
	}

	@Override
	protected void onDraw(Canvas canvas) {
		for(int i=0; i<LinesNum; i++){
			int textSize = 30+i;
			paint.setTextSize(textSize);
			canvas.drawText("cctvjiatao", xStart, textSize*(1+i), paint);
		}
		if(thread == null){
			thread = new ViewThread();
			thread.start();
		}
	}

	class ViewThread extends Thread{
		@Override
		public void run() {
		    while(isScroll){
		    	xStart += 3;
		    	if(xStart > getWidth()){
		    		xStart = 0 - paint.measureText("cctvjiatao");
		    	}
		    	postInvalidate();
		    	try {
	                Thread.sleep(30);
                } catch (InterruptedException e) {
	                e.printStackTrace();
                }
		    }
		}
	}
}

res/values/attrsjiatao.xml(新建的xml)

<pre name="code" class="html"><?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="JiataoCustom">
        <attr name="Lines" format="integer"/>
        <attr name="Scroll" format="boolean" />
    </declare-styleable>
</resources>

运行结果：