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="/apk/res/com.example.circlepregress"
xmlns:tools="/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=/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。
