View：

/**
 * author : stone
 * email  : [email protected]
 * time   : 16/5/29 15 29
 */
public class EarthPathView extends View {

    private Path mPath;
    private Paint mPaint;
    private Bitmap mBitmap;
    private PathMeasure mPathMeasure;
    private float[] mPoint;
    private float[] mTan;
    private float mDdegrees;

    public EarthPathView(Context context) {
        this(context, null);
    }

    public EarthPathView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public EarthPathView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);

        mPaint = new Paint();
        mPaint.setColor(Color.RED);
        mPaint.setStyle(Paint.Style.STROKE);
        mPaint.setStrokeWidth(10);

        InputStream is = getResources().openRawResource(R.drawable.earth);
        mBitmap = BitmapFactory.decodeStream(is);

    }

    public void setPath(Path path) {
        mPath = path;
        mPathMeasure = new PathMeasure(path, false);
        mPoint = new float[2];
        mTan = new float[2];

    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        if (mPath == null) {
            return;
        }


        canvas.rotate(mDdegrees+=2, getWidth()/2, getHeight()/2);
        canvas.drawPath(mPath, mPaint);

        float degress = (float) Math.toDegrees(Math.atan2(mTan[1], mTan[0]));
        Matrix matrix = new Matrix();
        matrix.postRotate(degress, mBitmap.getWidth() / 2, mBitmap.getHeight() / 2);
        matrix.postTranslate(mPoint[0] - mBitmap.getWidth() / 2, mPoint[1] - mBitmap.getHeight() / 2);
        canvas.drawBitmap(mBitmap, matrix, null);


    }

    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    public void startAnim() {
        ValueAnimator animator = ValueAnimator.ofFloat(0, mPathMeasure.getLength());
        animator.setDuration(2000);
        animator.setInterpolator(new LinearInterpolator()); //插值器
        animator.setRepeatCount(ValueAnimator.INFINITE);
        animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                float distance = (float) animation.getAnimatedValue();
                mPathMeasure.getPosTan(distance, mPoint, mTan);
                invalidate();
            }
        });
        animator.start();
    }
}
 

package com.stone.canvaspath;

import android.app.Activity;
import android.graphics.Path;
import android.os.Bundle;

import com.stone.canvaspath.earth.EarthPathView;

/**
 * author : stone
 * email  : [email protected]
 * time   : 16/5/29 15 27
 */
public class EarthActivity extends Activity {

    private EarthPathView mPathView;
    private Path mPath;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        int w = getResources().getDisplayMetrics().widthPixels;
        int h = getResources().getDisplayMetrics().heightPixels;

        mPathView = new EarthPathView(this);

        setContentView(mPathView);

        int min = Math.min(w, h);
        buildPath(w / 2 + 100, h / 2 + 100, min / 4);

        mPathView.setPath(mPath);

        mPathView.startAnim();
    }

    private void buildPath(float x, float y, float radius) {
        mPath = new Path();
        mPath.addCircle(x, y, radius, Path.Direction.CW);
    }

}