Android布局文件.xml中的自定义属性（结合封装的自定义View）

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=".MainActivity2"
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.MainActivity2

package com.cctvjiatao.xmlset;

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

public class MainActivity2 extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
}
}

activity_main2.xml

<!--
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:jiatao="http://schemas.android.com/apk/res/com.cctvjiatao.xmlset"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.cctvjiatao.xmlset.MainActivity2" >

<!-- 一定要写正确自定义View的“包名+类名”，不然汇报错：Binary XML file line #9: Error inflating class.. -->

<com.cctvjiatao.xmlset.TestView2
android:layout_width="match_parent"
android:layout_height="match_parent"
jiatao:isScroll="true"
jiatao:linesNum="10" >
</com.cctvjiatao.xmlset.TestView2>

</RelativeLayout>

com.cctvjiatao.xmlset.BaseView

package com.cctvjiatao.xmlset;

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

/**
* @作者： jiatao
* @修改时间：2016-3-12 下午9:12:42
* @包名：com.cctvjiatao.xmlset
* @文件名：BaseView.java
* @版权声明：www.cctvjiatao.com
* @功能： 自定义View的封装类
*/
public abstract class BaseView extends View {

private DrawThread thread;
private boolean isRunning = true;
private long time = 30;

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

public BaseView(Context context, AttributeSet attrs) {
super(context, attrs);
}

protected abstract void drawSub(Canvas canvas);
protected abstract void drawLogic();

@Override
protected void onDraw(Canvas canvas) {
if(thread == null){
thread = new DrawThread();
thread.start();
}else{
drawSub(canvas);
}
}

@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
isRunning = false;
}

class DrawThread extends Thread{
@Override
public void run() {
while(isRunning){
drawLogic();
postInvalidate();
try {
Thread.sleep(time);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}

}

com.cctvjiatao.xmlset.TestView2

package com.cctvjiatao.xmlset;

import com.cctvjiatao.xmlset.R;
import com.cctvjiatao.xmlset.R.styleable;

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

/**
* @作者： jiatao
* @修改时间：2016-3-12 下午9:24:29
* @包名：com.cctvjiatao.xmlset
* @文件名：TestView.java
* @版权声明：com.cctvjiatao.xmlset.test
* @功能： 测试类，在xml中设置属性
*/
public class TestView2 extends BaseView {

private int linesNum = 0;
private boolean isScroll = false;
private float xStart = 0;
private Paint paint = new Paint();

public TestView2(Context context) {
super(context);
}

public TestView2(Context context, AttributeSet attrs) {
super(context, attrs);
TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.JiataoNumText);
linesNum = ta.getInt(R.styleable.JiataoNumText_linesNum, 1);
isScroll = ta.getBoolean(R.styleable.JiataoNumText_isScroll, false);
ta.recycle();
}

@Override
protected void drawSub(Canvas canvas) {
for(int i=0; i<linesNum; i++){
int textSize = 30+i;
paint.setTextSize(textSize);
canvas.drawText("cctvjiatao", xStart, textSize*(1+i), paint);
}
}

@Override
protected void drawLogic() {
if(isScroll){
xStart += 3;
if(xStart > getWidth()){
xStart = 0 - paint.measureText("cctvjiatao");
}
}else{
return;
}
}

}

res/values/attrs.xml(新建的xml)

<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="JiataoNumText">
<attr name="linesNum" format="integer"/>
<attr name="isScroll" format="boolean" />
</declare-styleable>
</resources>

运行结果：