java - Android onAnimationEnd 删除 View (自身)不删除

Question

我正在尝试制作卡片翻转的动画，然后用动画将其扔掉。大部分我已经完成了。问题是我无法可靠地移除卡。

问题:如何在动画完成后可靠地删除 View ？ (我也在使用AnimationSet，所以这可能会改变一些事情)

这是我的代码的样子。

flingCardAway(问题区域)

private void flingCardAway(){
    final View cardContainer = findViewById(R.id.card_container);
    ViewCompat.setTranslationZ(cardContainer, 1.0f);

    AnimationSet anim = new AnimationSet(true);

    RotateAnimation rotate1 = new RotateAnimation(0,-45, Animation.RELATIVE_TO_SELF,0.5f , Animation.RELATIVE_TO_SELF,0.5f );
    rotate1.setStartOffset(100);
    rotate1.setDuration(500);
    anim.addAnimation(rotate1);

    TranslateAnimation trans1 =  new TranslateAnimation(Animation.RELATIVE_TO_PARENT, -0.1f, Animation.RELATIVE_TO_PARENT, -0.1f, Animation.RELATIVE_TO_PARENT, 0.0f, Animation.RELATIVE_TO_PARENT, 0.0f);
    trans1.setDuration(600);
    anim.addAnimation(trans1);

    AlphaAnimation opacity1 = new AlphaAnimation(1.0f, 0.0f);
    opacity1.setDuration(400);
    opacity1.setStartOffset(200);
    anim.addAnimation(opacity1);

    cardContainer.setAnimation(anim);
    cardContainer.setVisibility(View.VISIBLE);



    anim.setAnimationListener(new Animation.AnimationListener(){
        @Override
        public void onAnimationStart(Animation arg0) {
        }
        @Override
        public void onAnimationRepeat(Animation arg0) {
        }
        @Override
        public void onAnimationEnd(Animation arg0) {
            final View cardContainer2 = findViewById(R.id.card_container);
            ((ViewGroup)cardContainer2.getParent()).removeView(cardContainer2);
        }
    });
}

完整类(class)供引用研究.java

package com.example.trevorwood.biggles.study;

import android.content.Context;
import android.content.Intent;
import android.graphics.Color;
import android.graphics.PorterDuff;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.support.v4.view.ViewCompat;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.view.animation.AnimationSet;
import android.view.animation.RotateAnimation;
import android.view.animation.TranslateAnimation;
import android.widget.FrameLayout;
import android.widget.LinearLayout;

import com.example.trevorwood.biggles.R;

public class Study extends AppCompatActivity {
    LinearLayout mFlipCardLinearLayout;
    LinearLayout mCardFlippedButtons;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_study);
        Intent intent = getIntent();
        // String value = intent.getStringExtra("key");
        Toolbar toolbar = (Toolbar) findViewById(R.id.study_toolbar);
        toolbar.setTitleTextColor(Color.WHITE);//0xAARRGGBB
        setSupportActionBar(toolbar);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        mFlipCardLinearLayout = (LinearLayout) findViewById(R.id.flip_card_linear_layout);
        mCardFlippedButtons = (LinearLayout) findViewById(R.id.card_flipped_buttons);

        final Drawable upArrow = getResources().getDrawable(R.drawable.ic_back_arrow);
        upArrow.setColorFilter(getResources().getColor(R.color.colorWhite), PorterDuff.Mode.SRC_ATOP);
        getSupportActionBar().setHomeAsUpIndicator(upArrow);

        makeNewCard();

    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        switch (item.getItemId()) {
            // Respond to the action bar's Up/Home button
            case android.R.id.home:
                onBackPressed();
                return true;
        }
        return super.onOptionsItemSelected(item);
    }

    @Override
    public void onBackPressed() {
        super.onBackPressed();
    }

    public void onCardClick(View view) {
        flipCard();
    }

    public void onCardFlippedButtonsClick(View view) {
        Integer numberPressed;
        switch (view.getId()){
            case R.id.color_button_1:numberPressed = 1;break;
            case R.id.color_button_2:numberPressed = 2;break;
            case R.id.color_button_3:numberPressed = 3;break;
            case R.id.color_button_4:numberPressed = 4;break;
            case R.id.color_button_5:numberPressed = 5;break;
            default:numberPressed = 0;
        }

        saveCardStats(numberPressed);
        flingCardAway();
        resetForNewCard();
        makeNewCard();
    }

    private void flipCard() {
        FrameLayout cardFrame = (FrameLayout) findViewById(R.id.card_frame);
        Integer childCount = cardFrame.getChildCount();
        Log.d("Simple","childCount: "+childCount);

        View cardContainer = findViewById(R.id.card_container);
        View cardFace = findViewById(R.id.card_front);
        View cardBack = findViewById(R.id.card_back);

        FlipAnimation flipAnimation = new FlipAnimation(cardFace, cardBack);

        if (cardFace.getVisibility() == View.GONE) {
            mFlipCardLinearLayout.setVisibility(View.VISIBLE);
            mCardFlippedButtons.setVisibility(View.GONE);
            flipAnimation.reverse();
        }else{
            mFlipCardLinearLayout.setVisibility(View.GONE);
            mCardFlippedButtons.setVisibility(View.VISIBLE);
        }
        cardContainer.startAnimation(flipAnimation);
    }

    private void saveCardStats(Integer numberPressed){

    }

    private void flingCardAway(){
        final View cardContainer = findViewById(R.id.card_container);
        ViewCompat.setTranslationZ(cardContainer, 1.0f);

        AnimationSet anim = new AnimationSet(true);

        RotateAnimation rotate1 = new RotateAnimation(0,-45, Animation.RELATIVE_TO_SELF,0.5f , Animation.RELATIVE_TO_SELF,0.5f );
        rotate1.setStartOffset(100);
        rotate1.setDuration(500);
        anim.addAnimation(rotate1);

        TranslateAnimation trans1 =  new TranslateAnimation(Animation.RELATIVE_TO_PARENT, -0.1f, Animation.RELATIVE_TO_PARENT, -0.1f, Animation.RELATIVE_TO_PARENT, 0.0f, Animation.RELATIVE_TO_PARENT, 0.0f);
        trans1.setDuration(600);
        anim.addAnimation(trans1);

        AlphaAnimation opacity1 = new AlphaAnimation(1.0f, 0.0f);
        opacity1.setDuration(400);
        opacity1.setStartOffset(200);
        anim.addAnimation(opacity1);

        cardContainer.setAnimation(anim);
        cardContainer.setVisibility(View.VISIBLE);



        anim.setAnimationListener(new Animation.AnimationListener(){
            @Override
            public void onAnimationStart(Animation arg0) {
            }
            @Override
            public void onAnimationRepeat(Animation arg0) {
            }
            @Override
            public void onAnimationEnd(Animation arg0) {
                final View cardContainer2 = findViewById(R.id.card_container);
                ((ViewGroup)cardContainer2.getParent()).removeView(cardContainer2);
            }
        });
    }

    private void resetForNewCard(){
        mFlipCardLinearLayout.setVisibility(View.VISIBLE);
        mCardFlippedButtons.setVisibility(View.GONE);
    }

    private void makeNewCard(){
        FrameLayout cardFrame = (FrameLayout) findViewById(R.id.card_frame);
        Integer childCount = cardFrame.getChildCount();
        Log.d("Simple","childCount: "+childCount);
        LayoutInflater inflater = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        inflater.inflate(R.layout.study_card, cardFrame);
    }

}

FlipAnimation.java(没那么重要，只是一个引用)

package com.example.trevorwood.biggles.study;

import android.graphics.Camera;
import android.graphics.Matrix;
import android.view.View;
import android.view.animation.AccelerateDecelerateInterpolator;
import android.view.animation.Animation;
import android.view.animation.Transformation;

public class FlipAnimation extends Animation {
    private Camera camera;
    private View fromView;
    private View toView;

    private float centerX;
    private float centerY;

    private boolean forward = true;

    /**
     * Creates a 3D flip animation between two views.
     *
     * @param fromView First view in the transition.
     * @param toView   Second view in the transition.
     */
    public FlipAnimation(View fromView, View toView) {
        this.fromView = fromView;
        this.toView = toView;

        setDuration(300);
        setFillAfter(false);
        setInterpolator(new AccelerateDecelerateInterpolator());
    }

    public void reverse() {
        forward = false;
        View switchView = toView;
        toView = fromView;
        fromView = switchView;
    }

    @Override
    public void initialize(int width, int height, int parentWidth, int parentHeight) {
        super.initialize(width, height, parentWidth, parentHeight);
        centerX = width / 2;
        centerY = height / 2;
        camera = new Camera();
    }

    @Override
    protected void applyTransformation(float interpolatedTime, Transformation t) {
        // Angle around the y-axis of the rotation at the given time
        // calculated both in radians and degrees.
        final double radians = Math.PI * interpolatedTime;
        float degrees = (float) (180.0 * radians / Math.PI);

        // Once we reach the midpoint in the animation, we need to hide the
        // source view and show the destination view. We also need to change
        // the angle by 180 degrees so that the destination does not come in
        // flipped around
        if (interpolatedTime >= 0.5f) {
            degrees -= 180.f;
            fromView.setVisibility(View.GONE);
            toView.setVisibility(View.VISIBLE);
        }

        if (forward)
            degrees = -degrees; //determines direction of rotation when flip begins

        final Matrix matrix = t.getMatrix();
        camera.save();
        camera.translate(0, 0, Math.abs(degrees)*6);
        camera.getMatrix(matrix);
        camera.rotateY(degrees);
        camera.getMatrix(matrix);
        camera.restore();
        matrix.preTranslate(-centerX, -centerY);
        matrix.postTranslate(centerX, centerY);
    }
}

我看到了这个，它有帮助，但没有解决我的问题。 End animation event android

我也看到了这个，但不知道如何将其实现到我自己的项目中。 android animation is not finished in onAnimationEnd

谷歌文档都指向 this link但这在快速点击下并不可靠。

Answer 1

这对我有用。即使你想一想，它也可能行不通。 (如果转换为 JavaScript，它 100% 将无法工作，因为 View 在动画结束之前被删除。)也许有更多 Android 经验的人可以解释为什么会这样。

我对为什么会这样的假设(请记住，这只是一个猜测):是 Android 的动画实际上将 View 完全变成了其他东西，而原始 View 变成了透明。然后当动画结束时，动画 View 被删除，原始 View 恢复可见。

private void flingCardAway(){

    View cardContainer = findViewById(R.id.card_container);
    ViewCompat.setTranslationZ(cardContainer, 1.0f);

    AnimationSet anim = new AnimationSet(true);

    RotateAnimation rotate1 = new RotateAnimation(0,-45, Animation.RELATIVE_TO_SELF,0.5f , Animation.RELATIVE_TO_SELF,0.5f );
    rotate1.setStartOffset(10);
    rotate1.setDuration(500);
    anim.addAnimation(rotate1);

    TranslateAnimation trans1 =  new TranslateAnimation(Animation.RELATIVE_TO_PARENT, -0.2f, Animation.RELATIVE_TO_PARENT, -0.0f, Animation.RELATIVE_TO_PARENT, 0.0f, Animation.RELATIVE_TO_PARENT, 0.0f);
    trans1.setDuration(100);
    anim.addAnimation(trans1);

    TranslateAnimation trans2 =  new TranslateAnimation(Animation.RELATIVE_TO_PARENT, -0.1f, Animation.RELATIVE_TO_PARENT, -0.1f, Animation.RELATIVE_TO_PARENT, 0.0f, Animation.RELATIVE_TO_PARENT, 0.0f);
    trans2.setStartOffset(100);
    trans2.setDuration(100);
    anim.addAnimation(trans2);

    AlphaAnimation opacity1 = new AlphaAnimation(1.0f, 0.0f);
    opacity1.setDuration(300);
    opacity1.setStartOffset(300);
    anim.addAnimation(opacity1);

    cardContainer.setAnimation(anim);


    mCardFrame.removeAllViews();

}