Android 点击下弹动画实现

jopen 8年前

下弹动画在很多应用都有使用,比如豌豆荚中的应用介绍界面,百度手机助手的应用介绍界面等。

只要熟悉android动画的使用接口,制作动画并不困难。 这里使用开源库nineoldandroids,其实和android3.0 以上直接使用动画接口是一样的。

实现效果

具体可以看youku动画:http://v.youku.com/v_show/id_XNjYyODgzNjQ4.html


PS, 搞了半天GIF 才能播放。原来是最大边不能太大了。原来图片尺寸太大,被默认转成jpg了。现在总算能看到效果了。

Android 点击下弹动画实现

 

DropDownExample.java

    package com.buptfarmer.devapp;                import com.nineoldandroids.animation.Animator;        import com.nineoldandroids.animation.AnimatorListenerAdapter;        import com.nineoldandroids.animation.ValueAnimator;                import android.app.Activity;        import android.os.Bundle;        import android.view.View;        import android.view.View.OnClickListener;        import android.view.ViewGroup;                public class DropDownExample extends Activity implements OnClickListener {            private View mHolder;            private View mHolder2;        //    private static final int DURATION = 2000;                    @Override            protected void onCreate(Bundle savedInstanceState) {                super.onCreate(savedInstanceState);                initView();            }                    private void initView() {                setContentView(R.layout.drop_down_example);                mHolder = findViewById(R.id.holder);                mHolder2 = findViewById(R.id.holder2);                mHolder.setOnClickListener(this);                mHolder2.setOnClickListener(this);            }                    public static ValueAnimator createHeightAnimator(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);                    }                });        //        animator.setDuration(DURATION);                return animator;            }                    public static void animateExpanding(final View view) {                view.setVisibility(View.VISIBLE);                        final int widthSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);                final int heightSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);                view.measure(widthSpec, heightSpec);                        ValueAnimator animator = createHeightAnimator(view, 0, view.getMeasuredHeight());                animator.start();            }                    public static void animateCollapsing(final View view) {                int origHeight = view.getHeight();                        ValueAnimator animator = createHeightAnimator(view, origHeight, 0);                animator.addListener(new AnimatorListenerAdapter() {                    public void onAnimationEnd(Animator animation) {                        view.setVisibility(View.GONE);                    };                });                animator.start();            }                    @Override            public void onClick(View v) {                if (v == mHolder) {                    if (View.GONE == mHolder.findViewById(R.id.hiddenview).getVisibility()) {                        animateExpanding(mHolder.findViewById(R.id.hiddenview));                    } else {                        animateCollapsing(mHolder.findViewById(R.id.hiddenview));                    }                } else if (v == mHolder2) {                    if (View.GONE == mHolder2.findViewById(R.id.hiddenview).getVisibility()) {                        animateExpanding(mHolder2.findViewById(R.id.hiddenview));                    } else {                        animateCollapsing(mHolder2.findViewById(R.id.hiddenview));                    }                }            }        }  
</div> </div> drop_down_example.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:orientation="vertical" >            <LinearLayout            android:id="@+id/holder"            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:background="@color/greenyellow"            android:orientation="vertical" >                <LinearLayout                android:layout_width="fill_parent"                android:layout_height="wrap_content"                android:gravity="center_vertical"                android:orientation="horizontal"                android:paddingLeft="1dp" >                    <ImageView                    android:id="@+id/app_icon"                    android:layout_width="wrap_content"                    android:layout_height="wrap_content"                    android:layout_gravity="center"                    android:contentDescription="picture"                    android:minWidth="32dp"                    android:src="@drawable/ic_launcher" />                    <TextView                    android:id="@+id/app_label"                    android:layout_width="wrap_content"                    android:layout_height="wrap_content"                    android:layout_marginLeft="5dp"                    android:ellipsize="end"                    android:gravity="left"                    android:singleLine="true"                    android:text="what's your dream?"                    android:textSize="13sp" />            </LinearLayout>                <LinearLayout                android:id="@+id/hiddenview"                android:layout_width="fill_parent"                android:layout_height="40dp"                android:gravity="center_vertical"                android:orientation="horizontal"                android:paddingLeft="1dp"                android:visibility="gone" >                    <TextView                    android:id="@+id/hidden_text"                    android:layout_width="wrap_content"                    android:layout_height="fill_parent"                    android:text="过个好年,马上有房" />            </LinearLayout>        </LinearLayout>            <LinearLayout            android:id="@+id/holder2"            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:background="@color/blueviolet"            android:orientation="vertical" >                <LinearLayout                android:layout_width="fill_parent"                android:layout_height="wrap_content"                android:gravity="center_vertical"                android:orientation="horizontal"                android:paddingLeft="1dp" >                    <ImageView                    android:id="@+id/app_icon"                    android:layout_width="wrap_content"                    android:layout_height="wrap_content"                    android:layout_gravity="center"                    android:contentDescription="picture"                    android:minWidth="32dp"                    android:src="@drawable/ic_launcher" />                    <TextView                    android:id="@+id/app_label"                    android:layout_width="wrap_content"                    android:layout_height="wrap_content"                    android:layout_marginLeft="5dp"                    android:ellipsize="end"                    android:gravity="left"                    android:singleLine="true"                    android:text="Self introduction"                    android:textSize="13sp" />            </LinearLayout>                <LinearLayout                android:id="@+id/hiddenview"                android:layout_width="fill_parent"                android:layout_height="40dp"                android:gravity="center_vertical"                android:orientation="horizontal"                android:paddingLeft="1dp"                android:visibility="gone" >                    <ImageView                     android:contentDescription="avatar"                    android:src="@drawable/avatar"                    android:layout_width="wrap_content"                    android:layout_height="wrap_content"                    android:layout_gravity="center"/>                <TextView                    android:id="@+id/hidden_text"                    android:layout_width="wrap_content"                    android:layout_height="fill_parent"                    android:text="乐山好事,积极乐观" />            </LinearLayout>        </LinearLayout>        </LinearLayout>  
</div> </div> 来自:http://blog.csdn.net/farmer_cc/article/details/18403001