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ObjectAnimator重置为初始状态

objectanimator android-animation android

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David Chen · 技术社区 · 6 年前

我想要实现的目标

自定义视图最初为绿色。
单击按钮时,视图开始无限地在绿色和白色之间设置其颜色的动画。
再次单击按钮时,视图应将其颜色重置为初始状态(绿色),并停止动画。

步骤2和3可以无限应用。

问题

我的问题是,在动画进行过程中单击按钮时,视图不会将其颜色重置为初始状态(绿色),相反,无论动画此时到达哪个点,视图都会变为最终状态(白色)。

我尝试使用 solution 从另一个类似的问题开始,但没有运气。

密码

如何初始化 ObjectAnimator

animator = ObjectAnimator.ofArgb(this, "color", WHITE);
animator.setDuration(ANIMATION_DURATION);
animator.setRepeatCount(Animation.INFINITE);
animator.setRepeatMode(ValueAnimator.REVERSE);

自定义视图类有一个私有成员 Animator.AnimatorListener ,实现 onAnimationEnd() ,然后我将其附加到 startAnimation() ,将其与中的动画师分离 onAnimationEnd() 因为我上面提到的解决方案是这样说的。

private Animator.AnimatorListener animatorListener = new AnimatorListenerAdapter() {
    @Override
    public void onAnimationEnd(Animator animation) {
        super.onAnimationEnd(animation);
        animation.removeListener(this);
        animation.setDuration(0);
        ((ObjectAnimator) animation).reverse();
    }
};

public void startAnimation(){
    animator.addListener(animatorListener);
    animator.setDuration(ANIMATION_DURATION);
    animator.start();
}

public void stopAnimation(){
    animator.end();
    // animatorListener.onAnimationEnd() will be called here
}

我不确定这是否是实现我目标的最佳方式,任何建议都将不胜感激。

1 回复 | 直到 6 年前

1

Brainnovo 6 年前

请尝试以下操作:

public class Demo8 extends AppCompatActivity {

private Button b;
private ViewC v;
private ObjectAnimator animator;

private enum animation_state {START, CLEAR}

private animation_state animation_current_state = animation_state.START;


@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.demo8);

    b = (Button) findViewById(R.id.b);
    v = (ViewC) findViewById(R.id.v);

    b.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (!animator.isRunning()) {
                CAnimator(animation_state.START);
            } else {
                CAnimator(animation_state.CLEAR);
            }
        }
    });

    animator = ObjectAnimator.ofArgb(v, "background", Color.WHITE);
    animator.setDuration(1000);
    animator.setRepeatCount(Animation.INFINITE);
    animator.setRepeatMode(ObjectAnimator.REVERSE);
    animator.addListener(animatorListener);
}

private Animator.AnimatorListener animatorListener = new AnimatorListenerAdapter() {
    @Override
    public void onAnimationStart(Animator animation, boolean isReverse) {

    }

    @Override
    public void onAnimationEnd(Animator animation) {
        super.onAnimationEnd(animation);
        Log.e("End" , "***********True");
        animation.removeListener(this);

    }

    @Override
    public void onAnimationRepeat(Animator animation) {
        super.onAnimationRepeat(animation);
        Log.e("Repeat" , "***********True");
      }

};


private void CAnimator(animation_state s) {
    animation_current_state = s;
    if (s == animation_state.START) {
        animator.start();
    } else if (s == animation_state.CLEAR) {
        animator.cancel();
        v.setBackground(Color.GREEN);
    }
}

}

ViewC(自定义视图):

public class ViewC extends View {


private static final Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
private int color;

public ViewC(Context context) {
    super(context);
}

public ViewC(Context context, @Nullable AttributeSet attrs) {
    super(context, attrs);
    color = Color.GREEN;
}

public ViewC(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
}

public ViewC(Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {
    super(context, attrs, defStyleAttr, defStyleRes);
}


@Override
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);

final RectF rect = new RectF(2.5f * 20,
            0.5f * (getHeight() - 5), getWidth() - 2.5f * 20,
            0.5f * (getHeight() + 5));
    paint.setColor(color);
    canvas.drawRect(rect, paint);
}

public void setBackground(int color){
    this.color = color;
    invalidate();
}


    }

布局演示8。xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical">

<com.example.admin.machinelearning.ViewC // Change this to your package
    android:layout_width="match_parent"
    android:layout_height="50dp"
    android:id="@+id/v">
</com.example.admin.machinelearning.ViewC>

<Button
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/b"
    android:text="Button"/>

</LinearLayout>