RoundProgressBar(圆形进度条)

在我们完成下载或者耗时的更新任务时，通常会用到任务的执行进度，那么圆形的进度条我们就需要自定义。直接看代码，我们需要完成的工作：

1.自定义view

/** * 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, 13);        roundWidth = mTypedArray.getDimension(R.styleable.RoundProgressBar_roundWidth, 3);        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;    }}

2.attrs配置属性

<declare-styleable name="RoundProgressBar">        <attr name="roundColor" format="color" />        <attr name="roundProgressColor" format="color" />        <attr name="textColor" format="color" />        <attr name="textSize" format="integer" />        <attr name="roundWidth" format="integer" />        <attr name="max" format="integer" />        <attr name="textIsDisplayable" format="boolean" />        <attr name="style" format="integer" />    </declare-styleable>

3.布局文件

 <?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    android:id="@+id/activity_main"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:padding="@dimen/activity_vertical_margin">    <com.mzxy.mtxx.roundprogressbar.RoundProgressBar        android:id="@+id/progress_bar"        android:layout_width="140dp"        android:layout_height="140dp"        app:max="100"        app:roundColor="#FF00B7FF"        app:roundProgressColor="#FFFF001E"        app:textColor="#000000" /></RelativeLayout>

4.主activity初始化和引用

public class MainActivity extends AppCompatActivity {    private RoundProgressBar roundProgressBar;    private Handler handler = new Handler();    private int progress = 0;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        roundProgressBar = (RoundProgressBar) findViewById(R.id.progress_bar);        downloadAsyn();    }    private void downloadAsyn() {        progress += 5;        handler.postDelayed(new Runnable() {            @Override            public void run() {                roundProgressBar.setProgress(progress);                if (progress < 100) {                    downloadAsyn();                }            }        }, 1000);    }}

5.运行效果：