本文实例为大家分享了Android自定义View图片按Path运动旋转的具体代码，供大家参考，具体内容如下

View：

/** * author : stone * email : aa86799@163.com * 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(); } }

Activity

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 : aa86799@163.com * 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); } }

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。