效果图如上，自定义方形的进度条，第一个是100%，第二个是70%

其实很简单的，就Path类

public class SquareProgressBar extends View { private int progress = 70;//进度 private int strokeWidth = 20; private Paint paint = null; private Path path = null; private int margin; public SquareProgressBar(Context context, AttributeSet attrs) { super(context, attrs); init(context); } private void init(Context context) { paint = new Paint(); margin = convertDpToPx(10, context); paint.setStyle(Paint.Style.STROKE); paint.setColor(context.getResources().getColor( android.R.color.holo_red_dark)); paint.setStrokeWidth(margin); paint.setAntiAlias(true); paint.setStyle(Style.STROKE); path = new Path(); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); float scope = getMeasuredWidth() * 2 + getMeasuredHeight() * 2; DrawLocation mLocation = getLocation(scope); if (mLocation.place == Place.TOP) { path.moveTo(margin, 10); path.lineTo(mLocation.location, 10); canvas.drawPath(path, paint); } if (mLocation.place == Place.RIGHT) { path.moveTo(margin, 10); path.lineTo(getMeasuredWidth()-10, 10); path.moveTo(getMeasuredWidth() - 10, 10); path.lineTo(getMeasuredWidth(), mLocation.location); canvas.drawPath(path, paint); } if (mLocation.place == Place.BOTTOM) { path.moveTo(margin, 10); path.lineTo(getMeasuredWidth(), 10); path.moveTo(getMeasuredWidth() - 10, 10); path.lineTo(getMeasuredWidth() - 10, getMeasuredHeight()); path.moveTo(getMeasuredWidth() - 10, getMeasuredHeight()); path.lineTo(mLocation.location, getMeasuredHeight()); canvas.drawPath(path, paint); } if (mLocation.place == Place.LEFT) { path.moveTo(margin, 10); path.lineTo(getMeasuredWidth(), 10); path.moveTo(getMeasuredWidth() - 10, 10); path.lineTo(getMeasuredWidth() - 10, getMeasuredHeight()); path.moveTo(getMeasuredWidth() - 10, getMeasuredHeight()); path.lineTo(margin, getMeasuredHeight()); path.moveTo(margin, getMeasuredHeight()); path.lineTo(margin, mLocation.location); Log.i("lcf", " mLocation.location = " + mLocation.location); canvas.drawPath(path, paint); } } public void setProgress(int progress) { this.progress = progress; postInvalidate(); } private DrawLocation getLocation(float scope) { float length = scope * progress / 100; DrawLocation mLocation = new DrawLocation(); if (length > getMeasuredWidth()) { float second = length - getMeasuredWidth(); if (second > getMeasuredHeight()) { float third = second - getMeasuredHeight(); if (third > getMeasuredWidth()) { float four = third - getMeasuredWidth(); mLocation.place = Place.LEFT; mLocation.location = getMeasuredHeight() - four; } else { mLocation.place = Place.BOTTOM; mLocation.location = getMeasuredWidth() - third; } } else { mLocation.place = Place.RIGHT; mLocation.location = second; } } else { mLocation.place = Place.TOP; mLocation.location = length; } return mLocation; } private class DrawLocation { public Place place; public float location; } public enum Place { LEFT, RIGHT, TOP, BOTTOM } public int convertDpToPx(float dp, Context context) { return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp, context.getResources().getDisplayMetrics()); }