直播源码Android实现 曲线路径动画
16lz
2021-12-04
源码
MainActivity.java
public class MainActivity extends AppCompatActivity { //ui private Button btnOne; private Button btnTwo; private Button btnAnim; //data private int screenHeight; private int screenWidth; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);//设置透明状态栏 setContentView(R.layout.activity_main); screenHeight=getResources().getDisplayMetrics().heightPixels; screenWidth=getResources().getDisplayMetrics().widthPixels; initViews(); } private void initViews() { btnOne = findViewById(R.id.btn_one); btnTwo = findViewById(R.id.btn_two); btnAnim = findViewById(R.id.btn_anim); final ValueAnimator valueAnimator=new ValueAnimator(); valueAnimator.setDuration(2000); valueAnimator.setObjectValues(new PointF(0, 0)); valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) { PointF point = (PointF) animation.getAnimatedValue(); btnAnim.setX(point.x); btnAnim.setY(point.y); } }); btnOne.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { valueAnimator.setEvaluator(new TypeEvaluator() { @Override public Object evaluate(float fraction, Object startValue, Object endValue) { return BezierUtil.calculateBezierPointForQuadratic(fraction, new PointF(btnAnim.getLeft(), btnAnim.getTop()), new PointF(screenWidth, screenHeight/2), new PointF(btnAnim.getLeft(), screenHeight)); } }); valueAnimator.start(); } }); btnTwo.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { valueAnimator.setEvaluator(new TypeEvaluator() { @Override public Object evaluate(float fraction, Object startValue, Object endValue) { return BezierUtil.calculateBezierPointForCubic(fraction, new PointF(btnAnim.getLeft(), btnAnim.getTop()), new PointF(screenWidth, screenHeight/3), new PointF(0, screenHeight/3*2), new PointF(btnAnim.getLeft(), screenHeight)); } }); valueAnimator.start(); } }); }}BezierUtil.java
public class BezierUtil { /** * B(t) = (1 - t)^2 * P0 + 2t * (1 - t) * P1 + t^2 * P2, t ∈ [0,1] * * @param t 曲线长度比例 * @param p0 起始点 * @param p1 控制点 * @param p2 终止点 * @return t对应的点 */ public static PointF calculateBezierPointForQuadratic(float t, PointF p0, PointF p1, PointF p2) { PointF point = new PointF(); float temp = 1 - t; point.x = temp * temp * p0.x + 2 * t * temp * p1.x + t * t * p2.x; point.y = temp * temp * p0.y + 2 * t * temp * p1.y + t * t * p2.y; return point; } /** * B(t) = P0 * (1-t)^3 + 3 * P1 * t * (1-t)^2 + 3 * P2 * t^2 * (1-t) + P3 * t^3, t ∈ [0,1] * * @param t 曲线长度比例 * @param p0 起始点 * @param p1 控制点1 * @param p2 控制点2 * @param p3 终止点 * @return t对应的点 */ public static PointF calculateBezierPointForCubic(float t, PointF p0, PointF p1, PointF p2, PointF p3) { PointF point = new PointF(); float temp = 1 - t; point.x = p0.x * temp * temp * temp + 3 * p1.x * t * temp * temp + 3 * p2.x * t * t * temp + p3.x * t * t * t; point.y = p0.y * temp * temp * temp + 3 * p1.y * t * temp * temp + 3 * p2.y * t * t * temp + p3.y * t * t * t; return point; }}activity_main.xml
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context=".MainActivity" > <Button android:id="@+id/btn_one" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="二阶贝塞尔曲线" /> <Button android:id="@+id/btn_two" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="三阶贝塞尔曲线" /> <Button android:id="@+id/btn_anim" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:text="Anim" /></LinearLayout>更多相关文章
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