Android : Semi Circle Progress Bar

Question

I want semi circle progress bar in background of image. just like below image.

Answer 1

This is a view which has height equal to half its width. Use the setters to adjust the behaviour as desired. By default the progress is 0 and the width of the arc is 20. Calling setProgress() will invalidate the view with the progress given. Adding a background drawable is possible and the progress bar will be draw on top.

public class SemicircularProgressBar extends View {
private int mProgress;
private RectF mOval;
private RectF mOvalInner;
private Paint mPaintProgress;
private Paint mPaintClip;
private float ovalsDiff;
private Path clipPath;

public SemicircularProgressBar(Context context) {
    super(context);
    init();
}

public SemicircularProgressBar(Context context, AttributeSet attrs) {
    super(context, attrs);
    init();
}

public SemicircularProgressBar(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    init();
}

private void init() {
    mProgress = 0;
    ovalsDiff = 20;
    mOval = new RectF();
    mOvalInner = new RectF();
    clipPath = new Path();
    mPaintProgress = new Paint();
    mPaintProgress.setColor(Color.GREEN);
    mPaintProgress.setAntiAlias(true);
    mPaintClip = new Paint();
    mPaintClip.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));
    mPaintClip.setAlpha(0);
    mPaintClip.setAntiAlias(true);
}


// call this from the code to change the progress displayed
public void setProgress(int progress) {
    this.mProgress = progress;
    invalidate();
}

// sets the width of the progress arc
public void setProgressBarWidth(float width) {
    this.ovalsDiff = width;
    invalidate();
}

// sets the color of the bar (#FF00FF00 - Green by default)
public void setProgressBarColor(int color){
    this.mPaintProgress.setColor(color);
}

@Override
public void onDraw(Canvas c) {
    super.onDraw(c);
    mOval.set(0, 0, this.getWidth(), this.getHeight()*2);
    mOvalInner.set(0+ovalsDiff, 0+ovalsDiff, this.getWidth()-ovalsDiff, this.getHeight()*2);
    clipPath.addArc(mOvalInner, 180, 180);
    c.clipPath(clipPath, Op.DIFFERENCE);
    c.drawArc(mOval, 180, 180f * ((float) mProgress / 100), true, mPaintProgress);
}

// Setting the view to be always a rectangle with height equal to half of its width
@Override
public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    int parentWidth = MeasureSpec.getSize(widthMeasureSpec);
    int parentHeight = MeasureSpec.getSize(heightMeasureSpec);
    this.setMeasuredDimension(parentWidth/2, parentHeight);
    ViewGroup.LayoutParams params = this.getLayoutParams();
    params.width = parentWidth;
    params.height = parentWidth/2;
    this.setLayoutParams(params);
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}