本文实例讲述了Android自定义圆形进度条，分享给大家供大家参考。具体如下：

运行效果截图如下：

具体代码如下：

自定义的View:

import com.example.circlepregress.R;

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;

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;

/**

* 构造方法

*/

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();

}

}

/******************** 下边是属性的get、set方法 ***************/

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;

}

}

所需要的资源文件：attrs.xml

布局文件如下：

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" >

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:roundWidth="10dip"

android_custom:textColor="#9A32CD"

android_custom:textSize="18sp" />

android:id="@+id/roundProgressBar4"

android_custom:style="FILL"

android:layout_width="80dip"

android:layout_height="80dip"

android:layout_alignParentRight="true"

android:layout_alignTop="@+id/roundProgressBar1"

android:layout_marginRight="32dp"

android_custom:roundProgressColor="#C2C2C2"

android_custom:roundWidth="1dip" />

android:id="@+id/roundProgressBar3"

android:layout_width="80dip"

android:layout_height="80dip"

android:layout_alignLeft="@+id/roundProgressBar4"

android:layout_alignTop="@+id/roundProgressBar2"

android_custom:roundColor="#C6E2FF"

android_custom:roundProgressColor="#CD3333"

android_custom:roundWidth="10dip"

android_custom:textIsDisplayable="false" />

android:id="@+id/roundProgressBar5"

android:layout_width="50dip"

android:layout_height="50dip"

android:layout_below="@+id/roundProgressBar1"

android:layout_marginLeft="22dp"

android:layout_toRightOf="@+id/roundProgressBar1" />

android:id="@+id/button1"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignParentLeft="true"

android:layout_alignParentRight="true"

android:layout_alignParentTop="true"

android:text="Button" />

android:id="@+id/roundProgressBar1"

android:layout_width="80dip"

android:layout_height="80dip"

android:layout_alignParentLeft="true"

android:layout_below="@+id/button1"

android:layout_marginLeft="16dp"

android:layout_marginTop="40dp" />

其中我们使用了这一句：

xmlns:android_custom=http://schemas.android.com/apk/res/com.example.circlepregress

xmlns:android_custom是我们自己定义的标签，res/com.example.circlepregress其中res/后边的就是我们自定义View所在的目录

MainActivity.java如下：

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import com.example.circlepregress.R;

public class MainActivity extends Activity {

private RoundProgressBar mRoundProgressBar1, mRoundProgressBar2 ,mRoundProgressBar3, mRoundProgressBar4, mRoundProgressBar5;

private int progress = 0;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_cricle_progress);

mRoundProgressBar1 = (RoundProgressBar) findViewById(R.id.roundProgressBar1);

mRoundProgressBar2 = (RoundProgressBar) findViewById(R.id.roundProgressBar2);

mRoundProgressBar3 = (RoundProgressBar) findViewById(R.id.roundProgressBar3);

mRoundProgressBar4 = (RoundProgressBar) findViewById(R.id.roundProgressBar4);

mRoundProgressBar5 = (RoundProgressBar) findViewById(R.id.roundProgressBar5);

((Button)findViewById(R.id.button1)).setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

new Thread(new Runnable() {

@Override

public void run() {

while(progress <= 100){

progress += 3;

System.out.println(progress);

mRoundProgressBar1.setProgress(progress);

mRoundProgressBar2.setProgress(progress);

mRoundProgressBar3.setProgress(progress);

mRoundProgressBar4.setProgress(progress);

mRoundProgressBar5.setProgress(progress);

try {

Thread.sleep(100);

} catch (InterruptedException e) {

e.printStackTrace();

}

}

}

}).start();

}

});

}

}

希望本文所述对大家学习Android软件编程有所帮助。