导语

下面介绍使用Android的动画框架来制作赏心悦目的动画效果，想看理论知识戳我。

主要内容

• 灵动菜单
• 计时器动画
• 下拉展开动画

具体内容

先上三种效果的效果图：

灵动菜单

• 布局文件

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

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/imageView_b"
        android:src="@drawable/b"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true" />

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/imageView_c"
        android:src="@drawable/c"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true" />

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/imageView_d"
        android:src="@drawable/d"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true" />

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/imageView_e"
        android:src="@drawable/e"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true" />

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/imageView_a"
        android:src="@drawable/a"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true" />

</RelativeLayout>

• Activity文件

public class PropertyTest extends Activity implements View.OnClickListener {

    private int[] mRes = {R.id.imageView_a, R.id.imageView_b, R.id.imageView_c,
            R.id.imageView_d, R.id.imageView_e};
    private List<ImageView> mImageViews = new ArrayList<ImageView>();
    private boolean mFlag = true;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.property);
        for (int i = 0; i < mRes.length; i++) {
            ImageView imageView = (ImageView) findViewById(mRes[i]);
            imageView.setOnClickListener(this);
            mImageViews.add(imageView);
        }
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.imageView_a:
                if (mFlag) {
                    startAnim();
                } else {
                    closeAnim();
                }
                break;
            default:
                Toast.makeText(PropertyTest.this, "" + v.getId(),
                        Toast.LENGTH_SHORT).show();
                break;
        }
    }

    private void closeAnim() {
        ObjectAnimator animator0 = ObjectAnimator.ofFloat(mImageViews.get(0),
                "alpha", 0.5F, 1F);
        ObjectAnimator animator1 = ObjectAnimator.ofFloat(mImageViews.get(1),
                "translationY", 200F, 0);
        ObjectAnimator animator2 = ObjectAnimator.ofFloat(mImageViews.get(2),
                "translationX", 200F, 0);
        ObjectAnimator animator3 = ObjectAnimator.ofFloat(mImageViews.get(3),
                "translationY", -200F, 0);
        ObjectAnimator animator4 = ObjectAnimator.ofFloat(mImageViews.get(4),
                "translationX", -200F, 0);
        AnimatorSet set = new AnimatorSet();
        set.setDuration(500);
        set.setInterpolator(new BounceInterpolator());
        set.playTogether(animator0, animator1, animator2, animator3, animator4);
        set.start();
        mFlag = true;
    }

    private void startAnim() {
        ObjectAnimator animator0 = ObjectAnimator.ofFloat(
                mImageViews.get(0),
                "alpha",
                1F,
                0.5F);
        ObjectAnimator animator1 = ObjectAnimator.ofFloat(
                mImageViews.get(1),
                "translationY",
                200F);
        ObjectAnimator animator2 = ObjectAnimator.ofFloat(
                mImageViews.get(2),
                "translationX",
                200F);
        ObjectAnimator animator3 = ObjectAnimator.ofFloat(
                mImageViews.get(3),
                "translationY",
                -200F);
        ObjectAnimator animator4 = ObjectAnimator.ofFloat(
                mImageViews.get(4),
                "translationX",
                -200F);
        AnimatorSet set = new AnimatorSet();
        set.setDuration(500);
        set.setInterpolator(new BounceInterpolator());
        set.playTogether(
                animator0,
                animator1,
                animator2,
                animator3,
                animator4);
        set.start();
        mFlag = false;
    }
}

• 效果图

• 素材

a.png	b.png	c.png	d.png	e.png

计时器动画

• 布局文件

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

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Click Me"
        android:textSize="60sp"
        android:onClick="tvTimer"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true" />
</RelativeLayout>

• Activity文件

public class TimerTest extends Activity {

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

    public void tvTimer(final View view) {
        ValueAnimator valueAnimator = ValueAnimator.ofInt(0, 100);
        valueAnimator.addUpdateListener(
                new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                ((TextView) view).setText("$ " +
                        (Integer) animation.getAnimatedValue());
            }
        });
        valueAnimator.setDuration(3000);
        valueAnimator.start();
    }
}

• 效果图

下拉展开动画

• 布局文件

<?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="wrap_content"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:gravity="center_vertical"
        android:onClick="llClick"
        android:background="@android:color/holo_blue_bright"
        android:orientation="horizontal">

        <ImageView
            android:id="@+id/app_icon"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:src="@mipmap/ic_launcher" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="5dp"
            android:gravity="left"
            android:text="Click Me"
            android:textSize="30sp" />
    </LinearLayout>

    <LinearLayout
        android:id="@+id/hidden_view"
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:background="@android:color/holo_orange_light"
        android:gravity="center_vertical"
        android:orientation="horizontal"
        android:visibility="gone">

        <ImageView
            android:src="@mipmap/ic_launcher"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center" />

        <TextView
            android:id="@+id/tv_hidden"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:gravity="center"
            android:textSize="20sp"
            android:text="I am hidden" />
    </LinearLayout>
</LinearLayout>

• Activity文件

public class DropTest extends Activity {

    private LinearLayout mHiddenView;
    private float mDensity;
    private int mHiddenViewMeasuredHeight;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.drop);
        mHiddenView = (LinearLayout) findViewById(R.id.hidden_view);
        // 获取像素密度
        mDensity = getResources().getDisplayMetrics().density;
        // 获取布局的高度
        mHiddenViewMeasuredHeight = (int) (mDensity * 40 + 0.5);
    }

    public void llClick(View view) {
        if (mHiddenView.getVisibility() == View.GONE) {
            // 打开动画
            animateOpen(mHiddenView);
        } else {
            // 关闭动画
            animateClose(mHiddenView);
        }
    }

    private void animateOpen(final View view) {
        view.setVisibility(View.VISIBLE);
        ValueAnimator animator = createDropAnimator(
                view,
                0,
                mHiddenViewMeasuredHeight);
        animator.start();
    }

    private void animateClose(final View view) {
        int origHeight = view.getHeight();
        ValueAnimator animator = createDropAnimator(view, origHeight, 0);
        animator.addListener(new AnimatorListenerAdapter() {
            public void onAnimationEnd(Animator animation) {
                view.setVisibility(View.GONE);
            }
        });
        animator.start();
    }

    private ValueAnimator createDropAnimator(
            final View view, int start, int end) {
        ValueAnimator animator = ValueAnimator.ofInt(start, end);
        animator.addUpdateListener(
                new ValueAnimator.AnimatorUpdateListener() {

            @Override
            public void onAnimationUpdate(ValueAnimator valueAnimator) {
                int value = (Integer) valueAnimator.getAnimatedValue();
                ViewGroup.LayoutParams layoutParams =
                        view.getLayoutParams();
                layoutParams.height = value;
                view.setLayoutParams(layoutParams);
            }
        });
        return animator;
    }
}

• 效果图