自定view

果吧

从上面可以看出，我们可以自定义圆环的颜色，圆环进度的颜色，是否显示进度的百分比，进度百分比的颜色，以及进度是实心还是空心等等，这样子是不是很多元化很方便呢？接下来我们就来教大家怎么来定义

 

1.在values下面新建一个attrs.xml，现在里面定义我们的属性，不同的属性对应不同的format，属性对应的format可以参考http://blog.youkuaiyun.com/pgalxx/article/details/6766677，介绍的还是比较详细，接下来我贴上我在自定义这个进度条所用到的属性

 

[html]  view plain copy print ?

1. <?xmlversion="1.0"encoding="UTF-8"?> 
2. <resources> 
3.     <declare-styleablename="RoundProgressBar">   
4.         <attrname="roundColor"format="color"/> 
5.         <attrname="roundProgressColor"format="color"/> 
6.         <attrname="roundWidth"format="dimension"></attr> 
7.         <attrname="textColor"format="color"/>   
8.         <attrname="textSize"format="dimension"/>  
9.         <attrname="max"format="integer"></attr>  
10.         <attrname="textIsDisplayable"format="boolean"></attr> 
11.         <attrname="style"> 
12.             <enumname="STROKE"value="0"></enum> 
13.             <enumname="FILL"value="1"></enum> 
14.         </attr> 
15.     </declare-styleable>  
16. </resources> 

<?xml version="1.0" encoding="UTF-8"?>
<resources>
    <declare-styleable name="RoundProgressBar">  
        <attr name="roundColor" format="color"/>
        <attr name="roundProgressColor" format="color"/>
        <attr name="roundWidth" format="dimension"></attr>
        <attr name="textColor" format="color" />  
        <attr name="textSize" format="dimension" /> 
        <attr name="max" format="integer"></attr> 
        <attr name="textIsDisplayable" format="boolean"></attr>
        <attr name="style">
            <enum name="STROKE" value="0"></enum>
            <enum name="FILL" value="1"></enum>
        </attr>
    </declare-styleable> 
</resources>

2.自定义View的属性我们算是定义好了，接下来就是怎么获取属性和代码的编写了，我们需要在构造方法中获取我们自己定义的相关属性，我们先调用context.obtainStyledAttributes(attrs,R.styleable.RoundProgressBar)来获取TypedArray，然后从TypedArray获取我们定义的属性，例如

 

 

[java]  view plain copy print ?

1. roundColor = mTypedArray.getColor(R.styleable.RoundProgressBar_roundColor, Color.RED); 
2.         roundProgressColor = mTypedArray.getColor(R.styleable.RoundProgressBar_roundProgressColor, Color.GREEN); 
3.         textColor = mTypedArray.getColor(R.styleable.RoundProgressBar_textColor, Color.GREEN); 
4.         textSize = mTypedArray.getDimension(R.styleable.RoundProgressBar_textSize, 15); 
5.         roundWidth = mTypedArray.getDimension(R.styleable.RoundProgressBar_roundWidth, 5); 
6.         max = mTypedArray.getInteger(R.styleable.RoundProgressBar_max, 100); 
7.         textIsDisplayable = mTypedArray.getBoolean(R.styleable.RoundProgressBar_textIsDisplayable, true); 
8.         style = mTypedArray.getInt(R.styleable.RoundProgressBar_style, 0); 

roundColor = mTypedArray.getColor(R.styleable.RoundProgressBar_roundColor, Color.RED);
		roundProgressColor = mTypedArray.getColor(R.styleable.RoundProgressBar_roundProgressColor, Color.GREEN);
		textColor = mTypedArray.getColor(R.styleable.RoundProgressBar_textColor, Color.GREEN);
		textSize = mTypedArray.getDimension(R.styleable.RoundProgressBar_textSize, 15);
		roundWidth = mTypedArray.getDimension(R.styleable.RoundProgressBar_roundWidth, 5);
		max = mTypedArray.getInteger(R.styleable.RoundProgressBar_max, 100);
		textIsDisplayable = mTypedArray.getBoolean(R.styleable.RoundProgressBar_textIsDisplayable, true);
		style = mTypedArray.getInt(R.styleable.RoundProgressBar_style, 0);

上面的代码中，如roundColor = mTypedArray.getColor(R.styleable.RoundProgressBar_roundColor, Color.RED); getColor方法的第一个参数是我们在XML文件中定义的颜色，如果我们没有给我们自定义的View定义颜色，他就会使用第二个参数中的默认值，即Color.RED

 

 

3.为了方便大家理解，我将自定义View的全部代码贴出来，里面的代码我也有详细的注释

 

[java]  view plain copy print ?

1. package com.example.roundprogressbar; 
2.  
3. import android.content.Context; 
4. import android.content.res.TypedArray; 
5. import android.graphics.Canvas; 
6. import android.graphics.Color; 
7. import android.graphics.Paint; 
8. import android.graphics.RectF; 
9. import android.graphics.Typeface; 
10. import android.util.AttributeSet; 
11. import android.util.Log; 
12. import android.view.View; 
13.  
14. import com.example.circlepregress.R; 
15.  
16. /**
17. * 仿iphone带进度的进度条，线程安全的View，可直接在线程中更新进度
18. * @author xiaanming
19. *
20. */ 
21. publicclass RoundProgressBar extends View { 
22.     /**
23.      * 画笔对象的引用
24.      */ 
25.     private Paint paint; 
26.      
27.     /**
28.      * 圆环的颜色
29.      */ 
30.     privateint roundColor; 
31.      
32.     /**
33.      * 圆环进度的颜色
34.      */ 
35.     privateint roundProgressColor; 
36.      
37.     /**
38.      * 中间进度百分比的字符串的颜色
39.      */ 
40.     privateint textColor; 
41.      
42.     /**
43.      * 中间进度百分比的字符串的字体
44.      */ 
45.     privatefloat textSize; 
46.      
47.     /**
48.      * 圆环的宽度
49.      */ 
50.     privatefloat roundWidth; 
51.      
52.     /**
53.      * 最大进度
54.      */ 
55.     privateint max; 
56.      
57.     /**
58.      * 当前进度
59.      */ 
60.     privateint progress; 
61.     /**
62.      * 是否显示中间的进度
63.      */ 
64.     privateboolean textIsDisplayable; 
65.      
66.     /**
67.      * 进度的风格，实心或者空心
68.      */ 
69.     privateint style; 
70.      
71.     publicstaticfinalint STROKE = 0; 
72.     publicstaticfinalint FILL = 1; 
73.      
74.     public RoundProgressBar(Context context) { 
75.         this(context, null); 
76.     } 
77.  
78.     public RoundProgressBar(Context context, AttributeSet attrs) { 
79.         this(context, attrs, 0); 
80.     } 
81.      
82.     public RoundProgressBar(Context context, AttributeSet attrs, int defStyle) { 
83.         super(context, attrs, defStyle); 
84.          
85.         paint = new Paint(); 
86.  
87.          
88.         TypedArray mTypedArray = context.obtainStyledAttributes(attrs, 
89.                 R.styleable.RoundProgressBar); 
90.          
91.         //获取自定义属性和默认值 
92.         roundColor = mTypedArray.getColor(R.styleable.RoundProgressBar_roundColor, Color.RED); 
93.         roundProgressColor = mTypedArray.getColor(R.styleable.RoundProgressBar_roundProgressColor, Color.GREEN); 
94.         textColor = mTypedArray.getColor(R.styleable.RoundProgressBar_textColor, Color.GREEN); 
95.         textSize = mTypedArray.getDimension(R.styleable.RoundProgressBar_textSize, 15); 
96.         roundWidth = mTypedArray.getDimension(R.styleable.RoundProgressBar_roundWidth, 5); 
97.         max = mTypedArray.getInteger(R.styleable.RoundProgressBar_max, 100); 
98.         textIsDisplayable = mTypedArray.getBoolean(R.styleable.RoundProgressBar_textIsDisplayable, true); 
99.         style = mTypedArray.getInt(R.styleable.RoundProgressBar_style, 0); 
100.          
101.         mTypedArray.recycle(); 
102.     } 
103.      
104.  
105.     @Override 
106.     protectedvoid onDraw(Canvas canvas) { 
107.         super.onDraw(canvas); 
108.          
109.         /**
110.          * 画最外层的大圆环
111.          */ 
112.         int centre = getWidth()/2; //获取圆心的x坐标 
113.         int radius = (int) (centre - roundWidth/2); //圆环的半径 
114.         paint.setColor(roundColor); //设置圆环的颜色 
115.         paint.setStyle(Paint.Style.STROKE); //设置空心 
116.         paint.setStrokeWidth(roundWidth); //设置圆环的宽度 
117.         paint.setAntiAlias(true);  //消除锯齿  
118.         canvas.drawCircle(centre, centre, radius, paint); //画出圆环 
119.          
120.         Log.e("log", centre + ""); 
121.          
122.         /**
123.          * 画进度百分比
124.          */ 
125.         paint.setStrokeWidth(0);  
126.         paint.setColor(textColor); 
127.         paint.setTextSize(textSize); 
128.         paint.setTypeface(Typeface.DEFAULT_BOLD); //设置字体 
129.         int percent = (int)(((float)progress / (float)max) * 100);  //中间的进度百分比，先转换成float在进行除法运算，不然都为0 
130.         float textWidth = paint.measureText(percent + "%");   //测量字体宽度，我们需要根据字体的宽度设置在圆环中间 
131.          
132.         if(textIsDisplayable && percent != 0 && style == STROKE){ 
133.             canvas.drawText(percent + "%", centre - textWidth / 2, centre + textSize/2, paint); //画出进度百分比 
134.         } 
135.          
136.          
137.         /**
138.          * 画圆弧 ，画圆环的进度
139.          */ 
140.          
141.         //设置进度是实心还是空心 
142.         paint.setStrokeWidth(roundWidth); //设置圆环的宽度 
143.         paint.setColor(roundProgressColor);  //设置进度的颜色 
144.         RectF oval = new RectF(centre - radius, centre - radius, centre 
145.                 + radius, centre + radius);  //用于定义的圆弧的形状和大小的界限 
146.          
147.         switch (style) { 
148.         case STROKE:{ 
149.             paint.setStyle(Paint.Style.STROKE); 
150.             canvas.drawArc(oval, 0, 360 * progress / max, false, paint);  //根据进度画圆弧 
151.             break; 
152.         } 
153.         case FILL:{ 
154.             paint.setStyle(Paint.Style.FILL_AND_STROKE); 
155.             if(progress !=0) 
156.                 canvas.drawArc(oval, 0, 360 * progress / max, true, paint);  //根据进度画圆弧 
157.             break; 
158.         } 
159.         } 
160.          
161.     } 
162.      
163.      
164.     publicsynchronizedint getMax() { 
165.         return max; 
166.     } 
167.  
168.     /**
169.      * 设置进度的最大值
170.      * @param max
171.      */ 
172.     publicsynchronizedvoid setMax(int max) { 
173.         if(max < 0){ 
174.             thrownew IllegalArgumentException("max not less than 0"); 
175.         } 
176.         this.max = max; 
177.     } 
178.  
179.     /**
180.      * 获取进度.需要同步
181.      * @return
182.      */ 
183.     publicsynchronizedint getProgress() { 
184.         return progress; 
185.     } 
186.  
187.     /**
188.      * 设置进度，此为线程安全控件，由于考虑多线的问题，需要同步
189.      * 刷新界面调用postInvalidate()能在非UI线程刷新
190.      * @param progress
191.      */ 
192.     publicsynchronizedvoid setProgress(int progress) { 
193.         if(progress < 0){ 
194.             thrownew IllegalArgumentException("progress not less than 0"); 
195.         } 
196.         if(progress > max){ 
197.             progress = max; 
198.         } 
199.         if(progress <= max){ 
200.             this.progress = progress; 
201.             postInvalidate(); 
202.         } 
203.          
204.     } 
205.      
206.      
207.     publicint getCricleColor() { 
208.         return roundColor; 
209.     } 
210.  
211.     publicvoid setCricleColor(int cricleColor) { 
212.         this.roundColor = cricleColor; 
213.     } 
214.  
215.     publicint getCricleProgressColor() { 
216.         return roundProgressColor; 
217.     } 
218.  
219.     publicvoid setCricleProgressColor(int cricleProgressColor) { 
220.         this.roundProgressColor = cricleProgressColor; 
221.     } 
222.  
223.     publicint getTextColor() { 
224.         return textColor; 
225.     } 
226.  
227.     publicvoid setTextColor(int textColor) { 
228.         this.textColor = textColor; 
229.     } 
230.  
231.     publicfloat getTextSize() { 
232.         return textSize; 
233.     } 
234.  
235.     publicvoid setTextSize(float textSize) { 
236.         this.textSize = textSize; 
237.     } 
238.  
239.     publicfloat getRoundWidth() { 
240.         return roundWidth; 
241.     } 
242.  
243.     publicvoid setRoundWidth(float roundWidth) { 
244.         this.roundWidth = roundWidth; 
245.     } 
246.  
247.  
248.  
249. } 

package com.example.roundprogressbar;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.Typeface;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;

import com.example.circlepregress.R;

/**
 * 仿iphone带进度的进度条，线程安全的View，可直接在线程中更新进度
 * @author xiaanming
 *
 */
public class RoundProgressBar extends View {
	/**
	 * 画笔对象的引用
	 */
	private Paint paint;
	
	/**
	 * 圆环的颜色
	 */
	private int roundColor;
	
	/**
	 * 圆环进度的颜色
	 */
	private int roundProgressColor;
	
	/**
	 * 中间进度百分比的字符串的颜色
	 */
	private int textColor;
	
	/**
	 * 中间进度百分比的字符串的字体
	 */
	private float textSize;
	
	/**
	 * 圆环的宽度
	 */
	private float roundWidth;
	
	/**
	 * 最大进度
	 */
	private int max;
	
	/**
	 * 当前进度
	 */
	private int progress;
	/**
	 * 是否显示中间的进度
	 */
	private boolean textIsDisplayable;
	
	/**
	 * 进度的风格，实心或者空心
	 */
	private int style;
	
	public static final int STROKE = 0;
	public static final int FILL = 1;
	
	public RoundProgressBar(Context context) {
		this(context, null);
	}

	public RoundProgressBar(Context context, AttributeSet attrs) {
		this(context, attrs, 0);
	}
	
	public RoundProgressBar(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		
		paint = new Paint();

		
		TypedArray mTypedArray = context.obtainStyledAttributes(attrs,
				R.styleable.RoundProgressBar);
		
		//获取自定义属性和默认值
		roundColor = mTypedArray.getColor(R.styleable.RoundProgressBar_roundColor, Color.RED);
		roundProgressColor = mTypedArray.getColor(R.styleable.RoundProgressBar_roundProgressColor, Color.GREEN);
		textColor = mTypedArray.getColor(R.styleable.RoundProgressBar_textColor, Color.GREEN);
		textSize = mTypedArray.getDimension(R.styleable.RoundProgressBar_textSize, 15);
		roundWidth = mTypedArray.getDimension(R.styleable.RoundProgressBar_roundWidth, 5);
		max = mTypedArray.getInteger(R.styleable.RoundProgressBar_max, 100);
		textIsDisplayable = mTypedArray.getBoolean(R.styleable.RoundProgressBar_textIsDisplayable, true);
		style = mTypedArray.getInt(R.styleable.RoundProgressBar_style, 0);
		
		mTypedArray.recycle();
	}
	

	@Override
	protected void onDraw(Canvas canvas) {
		super.onDraw(canvas);
		
		/**
		 * 画最外层的大圆环
		 */
		int centre = getWidth()/2; //获取圆心的x坐标
		int radius = (int) (centre - roundWidth/2); //圆环的半径
		paint.setColor(roundColor); //设置圆环的颜色
		paint.setStyle(Paint.Style.STROKE); //设置空心
		paint.setStrokeWidth(roundWidth); //设置圆环的宽度
		paint.setAntiAlias(true);  //消除锯齿 
		canvas.drawCircle(centre, centre, radius, paint); //画出圆环
		
		Log.e("log", centre + "");
		
		/**
		 * 画进度百分比
		 */
		paint.setStrokeWidth(0); 
		paint.setColor(textColor);
		paint.setTextSize(textSize);
		paint.setTypeface(Typeface.DEFAULT_BOLD); //设置字体
		int percent = (int)(((float)progress / (float)max) * 100);  //中间的进度百分比，先转换成float在进行除法运算，不然都为0
		float textWidth = paint.measureText(percent + "%");   //测量字体宽度，我们需要根据字体的宽度设置在圆环中间
		
		if(textIsDisplayable && percent != 0 && style == STROKE){
			canvas.drawText(percent + "%", centre - textWidth / 2, centre + textSize/2, paint); //画出进度百分比
		}
		
		
		/**
		 * 画圆弧 ，画圆环的进度
		 */
		
		//设置进度是实心还是空心
		paint.setStrokeWidth(roundWidth); //设置圆环的宽度
		paint.setColor(roundProgressColor);  //设置进度的颜色
		RectF oval = new RectF(centre - radius, centre - radius, centre
				+ radius, centre + radius);  //用于定义的圆弧的形状和大小的界限
		
		switch (style) {
		case STROKE:{
			paint.setStyle(Paint.Style.STROKE);
			canvas.drawArc(oval, 0, 360 * progress / max, false, paint);  //根据进度画圆弧
			break;
		}
		case FILL:{
			paint.setStyle(Paint.Style.FILL_AND_STROKE);
			if(progress !=0)
				canvas.drawArc(oval, 0, 360 * progress / max, true, paint);  //根据进度画圆弧
			break;
		}
		}
		
	}
	
	
	public synchronized int getMax() {
		return max;
	}

	/**
	 * 设置进度的最大值
	 * @param max
	 */
	public synchronized void setMax(int max) {
		if(max < 0){
			throw new IllegalArgumentException("max not less than 0");
		}
		this.max = max;
	}

	/**
	 * 获取进度.需要同步
	 * @return
	 */
	public synchronized int getProgress() {
		return progress;
	}

	/**
	 * 设置进度，此为线程安全控件，由于考虑多线的问题，需要同步
	 * 刷新界面调用postInvalidate()能在非UI线程刷新
	 * @param progress
	 */
	public synchronized void setProgress(int progress) {
		if(progress < 0){
			throw new IllegalArgumentException("progress not less than 0");
		}
		if(progress > max){
			progress = max;
		}
		if(progress <= max){
			this.progress = progress;
			postInvalidate();
		}
		
	}
	
	
	public int getCricleColor() {
		return roundColor;
	}

	public void setCricleColor(int cricleColor) {
		this.roundColor = cricleColor;
	}

	public int getCricleProgressColor() {
		return roundProgressColor;
	}

	public void setCricleProgressColor(int cricleProgressColor) {
		this.roundProgressColor = cricleProgressColor;
	}

	public int getTextColor() {
		return textColor;
	}

	public void setTextColor(int textColor) {
		this.textColor = textColor;
	}

	public float getTextSize() {
		return textSize;
	}

	public void setTextSize(float textSize) {
		this.textSize = textSize;
	}

	public float getRoundWidth() {
		return roundWidth;
	}

	public void setRoundWidth(float roundWidth) {
		this.roundWidth = roundWidth;
	}



}

4.通过上面几步我们就实现了自定义View,和自定义View的属性，当然使用过程中还是有一点变化，我们必须在界面布局的最顶层加上

 

xmlns:android_custom="http://schemas.android.com/apk/res/com.example.circlepregress"这个即命名空间，

 

• 红色部分是自定义属性的前缀，什么意思呢？对于android系统控件我们定义其控件属性是用android:XXX="XXXXXXX",而我们自己定义的就用android_custom:XXX = "XXXXXX"
• 绿色部分则是我们的包的名字

 

通过上面这两步我们就能自己定义属性了,我贴出自定义View在XML中使用情况

 

[java]  view plain copy print ?

1. <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"   
2.     xmlns:android_custom="http://schemas.android.com/apk/res/com.example.circlepregress" 
3.     xmlns:tools="http://schemas.android.com/tools"   
4.     android:layout_width="match_parent"   
5.     android:layout_height="match_parent" >   
6.    
7.    
8.     <com.example.roundprogressbar.RoundProgressBar   
9.         android:id="@+id/roundProgressBar2"   
10.         android:layout_width="80dip"   
11.         android:layout_height="80dip"   
12.         android:layout_alignLeft="@+id/roundProgressBar1"   
13.         android:layout_alignParentBottom="true"   
14.         android:layout_marginBottom="78dp"   
15.            
16.            
17.         android_custom:roundColor="#D1D1D1"   
18.         android_custom:roundProgressColor="@android:color/black"   
19.         android_custom:textColor="#9A32CD"   
20.         android_custom:textIsDisplayable="false"   
21.         android_custom:roundWidth="10dip"   
22.         android_custom:textSize="18sp"/>   
23. </RelativeLayout>  

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    xmlns:android_custom="http://schemas.android.com/apk/res/com.example.circlepregress"
    xmlns:tools="http://schemas.android.com/tools"  
    android:layout_width="match_parent"  
    android:layout_height="match_parent" >  
  
  
    <com.example.roundprogressbar.RoundProgressBar  
        android:id="@+id/roundProgressBar2"  
        android:layout_width="80dip"  
        android:layout_height="80dip"  
        android:layout_alignLeft="@+id/roundProgressBar1"  
        android:layout_alignParentBottom="true"  
        android:layout_marginBottom="78dp"  
          
          
        android_custom:roundColor="#D1D1D1"  
        android_custom:roundProgressColor="@android:color/black"  
        android_custom:textColor="#9A32CD"  
        android_custom:textIsDisplayable="false"  
        android_custom:roundWidth="10dip"  
        android_custom:textSize="18sp"/>  
</RelativeLayout>