自定义View实现圆形进度条

     自定义实现圆形进度条，首先你需要在value目录下新建attrs.xml属性文件:

<?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>

这是attrs的属性对应，format的值有string,integer,color.dimension,boolean等等。

然后在自定义的view类中获取这些属性:

//从values/attrs.xml加载属性TypedArray mTypedArray = context.obtainStyledAttributes(attrs, R.styleable.RoundProgressBar);//获取各个属性的值roundColor = mTypedArray.getColor(R.styleable.RoundProgressBar_roundColor, Color.RED);roundProgressColor = mTypedArray.getColor(R.styleable.RoundProgressBar_roundProgressColor, Color.GREEN);roundWidth = mTypedArray.getDimension(R.styleable.RoundProgressBar_roundWidth, 5);textColor = mTypedArray.getColor(R.styleable.RoundProgressBar_textColor, Color.GREEN);textSize = mTypedArray.getDimension(R.styleable.RoundProgressBar_textSize, 15);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();//为了保持以后使用该属性一致性

要实现自定义圆形进度条，最后需要在重写onDraw()方法，在里面可以设置空心，或者实心，颜色，字体大小等等。

给出示例代码;

package com.example.cirprogresstdw;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.view.View;public class RoundProgressBar extends View{/** * 圆环的颜色 */private int roundColor;/** * 圆环进度的颜色 */private int roundProgressColor;/** * 圆环的宽度 */private float roundWidth;/** * 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;/** * 最大进度 */private int max;/** * 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;/** * 当前进度 */private int progress;/** * 画笔对象的引用 */private Paint paint;//**构造函数public RoundProgressBar(Context context) {this(context, null);}public RoundProgressBar(Context context, AttributeSet attrs) {this(context, attrs, 0);}public RoundProgressBar(Context context, AttributeSet attrs,int defStyleAttr) {super(context, attrs, defStyleAttr);paint = new Paint();//从values/attrs.xml加载属性TypedArray mTypedArray = context.obtainStyledAttributes(attrs, R.styleable.RoundProgressBar);//获取各个属性的值roundColor = mTypedArray.getColor(R.styleable.RoundProgressBar_roundColor, Color.RED);roundProgressColor = mTypedArray.getColor(R.styleable.RoundProgressBar_roundProgressColor, Color.GREEN);roundWidth = mTypedArray.getDimension(R.styleable.RoundProgressBar_roundWidth, 5);textColor = mTypedArray.getColor(R.styleable.RoundProgressBar_textColor, Color.GREEN);textSize = mTypedArray.getDimension(R.styleable.RoundProgressBar_textSize, 15);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();//为了保持以后使用该属性一致性}@Overrideprotected void onDraw(Canvas canvas) {super.onDraw(canvas);/** * 画最外层的圆环 */int centre = getWidth()/2;//获得圆心的坐标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.setStyle(Paint.Style.FILL);//设置实心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);//必须先全转化为float型，不然全为0float textWidth = paint.measureText(percent+"%");//测量字体的大小,让其在圆心处显示if(textIsDisplayable && percent != 0 && style == STROKE){canvas.drawText(percent+"%", centre - textWidth/2, centre + textWidth/2, paint);}/** * 画圆弧 ，画圆环的进度 */paint.setStrokeWidth(roundWidth);//设置圆环的宽度paint.setColor(roundProgressColor);//设置圆弧的进度颜色RectF oval = new RectF(centre - radius, centre - radius, centre + radius, centre + radius);//画圆弧switch (style) {case STROKE://空心paint.setStyle(Paint.Style.STROKE);canvas.drawArc(oval, 0, 360 * progress/max, false, paint);//根据进度画圆弧break;case FILL://实心paint.setStyle(Paint.Style.FILL);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;}}

这里需要注意的是进度条的实现，在setProgress(int progress)方法中是进行互斥使用的，因为在布局文件中添加的不止一个圆形进度条，所以需要互斥使用。接下来给出布局文件:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:android_custom="http://schemas.android.com/apk/res/com.example.cirprogresstdw"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent" >    <Button         android:id="@+id/button"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Button"        android:layout_alignParentLeft="true"        android:layout_alignParentTop="true"        android:layout_alignParentRight="true"        />        <com.example.cirprogresstdw.RoundProgressBar         android:id="@+id/roundProgressBar1"        android:layout_below="@+id/button"        android:layout_width="80dp"        android:layout_height="80dp"        android:layout_alignParentLeft="true"        android:layout_marginLeft="16dp"        android:layout_marginTop="60dp"        />        <com.example.cirprogresstdw.RoundProgressBar         android:id="@+id/roundProgressBar2"        android:layout_width="80dp"        android:layout_height="80dp"        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:roundWidth="10dip"        android_custom:textSize="18sp"        />        <com.example.cirprogresstdw.RoundProgressBar         android:id="@+id/roundProgressBar3"        android:layout_alignParentRight="true"        android:layout_alignTop="@+id/roundProgressBar1"        android:layout_width="80dp"        android:layout_height="80dp"        android:layout_marginRight="38dp"                android_custom:style="FILL"        android_custom:roundWidth="1dip"        android_custom:roundProgressColor="#C2C2C2"        />        <com.example.cirprogresstdw.RoundProgressBar         android:id="@+id/roundProgressBar4"        android:layout_width="80dp"        android:layout_height="80dp"        android:layout_alignTop="@+id/roundProgressBar2"        android:layout_alignLeft="@+id/roundProgressBar3"                android_custom:roundColor="#C6E2FF"        android_custom:roundWidth="10dip"        android_custom:roundProgressColor="#CD3333"        android_custom:textIsDisplayable="false"        />        <com.example.cirprogresstdw.RoundProgressBar         android:id="@+id/roundProgressBar5"        android:layout_width="50dp"        android:layout_height="50dp"        android:layout_below="@+id/roundProgressBar1"        android:layout_toRightOf="@+id/roundProgressBar1"        android:layout_marginLeft="30dp"        /></RelativeLayout>

在布局文件中xmlns:android_custom="http://schemas.android.com/apk/res/com.example.cirprogresstdw"这个是自己定义空间，记得必须添加，...res/+清单文件下你的包名

实现自定义空间后，就可以在下面使用这个名字设置相应的属性。

这里给出了五个圆形进度条。

接下里给出主功能代码:

package com.example.cirprogresstdw;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.view.View;import android.widget.Button;public class MainActivity extends Activity {private Button button;private RoundProgressBar roundProgressBar1;private RoundProgressBar roundProgressBar2;private RoundProgressBar roundProgressBar3;private RoundProgressBar roundProgressBar4;private RoundProgressBar roundProgressBar5;private int progress = 0;Handler handler = new Handler(){@Overridepublic void handleMessage(android.os.Message msg) {roundProgressBar1.setProgress(Integer.valueOf(msg.obj.toString()));roundProgressBar2.setProgress(Integer.valueOf(msg.obj.toString()));roundProgressBar3.setProgress(Integer.valueOf(msg.obj.toString()));roundProgressBar4.setProgress(Integer.valueOf(msg.obj.toString()));roundProgressBar5.setProgress(Integer.valueOf(msg.obj.toString()));};};@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);roundProgressBar1 = (RoundProgressBar) findViewById(R.id.roundProgressBar1);roundProgressBar2 = (RoundProgressBar) findViewById(R.id.roundProgressBar2);roundProgressBar3 = (RoundProgressBar) findViewById(R.id.roundProgressBar3);roundProgressBar4 = (RoundProgressBar) findViewById(R.id.roundProgressBar4);roundProgressBar5 = (RoundProgressBar) findViewById(R.id.roundProgressBar5);button = (Button) findViewById(R.id.button);button.setOnClickListener(new OnClickListener());}private final class OnClickListener implements android.view.View.OnClickListener{@Overridepublic void onClick(View v) {new Thread(){@Overridepublic void run() {while(true){progress = progress + 3;handler.sendMessage(handler.obtainMessage(10, progress));if(progress >= 100){break;}try {Thread.sleep(1000);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}};}.start();;}}}

代码已经全部贴出。

完整代码:http://download.csdn.net/detail/tan313/8598753