android TranslateAnimation 顶部segment分段移动动画

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https://www.baiydu.com

这里实现的功能是从主页布局的fragment点击跳转到一个acitivity,然后顶部是一个切换的segment底部部是一个listview,点击segment分段让listview加载不同的内容。我这里没再使用viewpager，应该使用viewpager+listview也能实现。我这里使用的算是一个自定义的viewpager。下面我主要围绕TranslateAnimation segment切换动画类来谈，这东西吭比较多，我原本也是才做android开发的， 它这个类实现动画很多效果上的bug，效果bug直接说明android这个动画类没ios做的好，我遇到的这些效果bug主要出现在控件移动的距离和移动时间上的计算上。比如移动动画带有缓冲，或则移动分段两个以上，就没有动画效果。

下面先帖上布局,主要就是

<?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"
    xmlns:app="http://schemas.android.com/apk/res-auto"
              android:background="@color/white_color"
              android:orientation="vertical" >
    <TextView
        android:layout_width="match_parent"
        android:layout_height="@dimen/navigationbar_height"
        android:textSize="@dimen/title_fontsize"
        android:text="在线视频"

        android:textColor="@color/navigation_title_color"
        android:background="@color/navigationbar_backround_color"
        android:gravity="center"/>
     <LinearLayout
         android:layout_width="match_parent"
         android:layout_height="53dp"
         android:orientation="vertical"
         android:animateLayoutChanges="true"
         >
         <LinearLayout
             android:layout_width="match_parent"
             android:layout_height="50dp"
             android:orientation="horizontal"
             >

         <TextView
             android:layout_width="match_parent"
             android:layout_height="@dimen/navigationbar_height"
             android:layout_weight="1"
             android:textSize="@dimen/title_fontsize"
             android:text="推荐"
             android:id="@+id/tuijianVideo"
             android:textColor="@color/hot_price_color"
             android:background="@color/navigationbar_backround_color"
             android:gravity="center"/>
         <TextView
             android:layout_width="match_parent"
             android:layout_height="@dimen/navigationbar_height"
             android:textSize="@dimen/title_fontsize"
             android:layout_weight="1"
             android:text="电影"
             android:id="@+id/dianying"
             android:textColor="@color/navigation_title_color"
             android:background="@color/navigationbar_backround_color"
             android:gravity="center"/>
         <TextView
             android:layout_width="match_parent"
             android:layout_height="@dimen/navigationbar_height"
             android:textSize="@dimen/title_fontsize"
             android:text="电视"
             android:id="@+id/dianshi"
             android:layout_weight="1"
             android:textColor="@color/navigation_title_color"
             android:background="@color/navigationbar_backround_color"
             android:gravity="center"/>
         <TextView
             android:layout_width="match_parent"
             android:layout_height="@dimen/navigationbar_height"
             android:textSize="@dimen/title_fontsize"
             android:text="动漫"
             android:layout_weight="1"
             android:id="@+id/dongman"
             android:textColor="@color/navigation_title_color"
             android:background="@color/navigationbar_backround_color"
             android:gravity="center"/>
         <TextView
             android:layout_width="match_parent"
             android:layout_height="@dimen/navigationbar_height"
             android:textSize="@dimen/title_fontsize"
             android:text="综艺"
             android:id="@+id/zongyi"
             android:layout_weight="1"
             android:textColor="@color/navigation_title_color"
             android:background="@color/navigationbar_backround_color"
             android:gravity="center"/>
         </LinearLayout>

         <ImageView
             android:layout_width="match_parent"
             android:id="@+id/Imagezhishiqi"
             android:layout_height="3dp"
             android:background="@color/hot_price_color"/>
     </LinearLayout>

    <com.lt.WBTaoBaoKe.custom.xPullRefresh.XListView
        android:id="@+id/xListView"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" android:cacheColorHint="#00000000">
    </com.lt.WBTaoBaoKe.custom.xPullRefresh.XListView>
</LinearLayout>

下面贴代码,有动画说明的详细注视

public class HomeFragment_VideoActivity extends Activity implements View.OnClickListener {

    private ListViewAdapter listViewAdapter;
    private ViewPagerAdapter viewPagerAdapter;
    private Context context;
    private LinearLayout.LayoutParams zhishiqilinearParams;
    private int zhishiqiWidth;
    private ImageView zhishiqi;
    private TextView tuijianView;
    private TextView dianying;
    private TextView dianshi;
    private TextView dongman;
    private TextView zongyi;
    private int currentTopItemIndex;
    private TranslateAnimation moveAnimation;
    private int moveStepValue;

    //视频数据
    private XListView listView;
    private JSONArray CurrentVideoDataArray;
    private int currentVideoPageIndex;
    private String refreshTime = "第一次刷新";
    private ViewGroup.MarginLayoutParams margin;

    @Override
    protected void onCreate(final Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        context = getApplicationContext();
        setContentView(R.layout.home_video_activity);
        //指示器
        zhishiqi = (ImageView) findViewById(R.id.Imagezhishiqi);
        currentTopItemIndex = 1;
        DisplayMetrics dm = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(dm);
        int width = dm.widthPixels;
        //由于我们分段是固定的5段，所以这里先使用手机屏幕宽度/5，计算出分段指示器的宽度
        zhishiqiWidth = width / 5;
        //由于在固定布局中无法准确设置出指示器的宽度，所以这里需要使用计算出的宽度重新设置指示器宽度
        zhishiqilinearParams = (LinearLayout.LayoutParams) zhishiqi.getLayoutParams();
        zhishiqilinearParams.width = zhishiqiWidth;
        zhishiqi.setLayoutParams(zhishiqilinearParams);
        //下面都是每个分段里面显示文字的textview控件
        tuijianView = (TextView) findViewById(R.id.tuijianVideo);
        dianying = (TextView) findViewById(R.id.dianying);
        dianshi = (TextView) findViewById(R.id.dianshi);
        dongman = (TextView) findViewById(R.id.dongman);
        zongyi = (TextView) findViewById(R.id.zongyi);

        tuijianView.setTag(1);
        dianying.setTag(2);
        dianshi.setTag(3);
        dongman.setTag(4);
        zongyi.setTag(5);

        tuijianView.setOnClickListener(this);
        dianying.setOnClickListener(this);
        dianshi.setOnClickListener(this);
        dongman.setOnClickListener(this);
        zongyi.setOnClickListener(this);

    }

    //每个分段textview点击事件
    @Override
    public void onClick(View v) {

        int tag = (Integer) v.getTag();

        //获得控件移动的段数确定移动方向,如果是正数表示向右移动，负数左移动
        moveStepValue = tag - currentTopItemIndex;

        switch (tag) {
            case 1:
                if (currentTopItemIndex == 1) {
                    return;
                } else {
                    currentTopItemIndex = tag;

                    tuijianView.setTextColor(this.getResources().getColor(R.color.hot_price_color));

                    dianying.setTextColor(this.getResources().getColor(R.color.white_color));
                    dianshi.setTextColor(this.getResources().getColor(R.color.white_color));
                    dongman.setTextColor(this.getResources().getColor(R.color.white_color));
                    zongyi.setTextColor(this.getResources().getColor(R.color.white_color));

                }
                break;

            case 2:
                if (currentTopItemIndex == 2) {
                    return;
                } else {
                    currentTopItemIndex = tag;

                    tuijianView.setTextColor(this.getResources().getColor(R.color.white_color));

                    dianying.setTextColor(this.getResources().getColor(R.color.hot_price_color));
                    dianshi.setTextColor(this.getResources().getColor(R.color.white_color));
                    dongman.setTextColor(this.getResources().getColor(R.color.white_color));
                    zongyi.setTextColor(this.getResources().getColor(R.color.white_color));

                }
                break;

            case 3:
                if (currentTopItemIndex == 3) {
                    return;
                } else {
                    currentTopItemIndex = tag;

                    tuijianView.setTextColor(this.getResources().getColor(R.color.white_color));

                    dianying.setTextColor(this.getResources().getColor(R.color.white_color));
                    dianshi.setTextColor(this.getResources().getColor(R.color.hot_price_color));
                    dongman.setTextColor(this.getResources().getColor(R.color.white_color));
                    zongyi.setTextColor(this.getResources().getColor(R.color.white_color));
                }
                break;
            case 4:
                if (currentTopItemIndex == 4) {
                    return;
                } else {
                    currentTopItemIndex = tag;

                    tuijianView.setTextColor(this.getResources().getColor(R.color.white_color));

                    dianying.setTextColor(this.getResources().getColor(R.color.white_color));
                    dianshi.setTextColor(this.getResources().getColor(R.color.white_color));
                    dongman.setTextColor(this.getResources().getColor(R.color.hot_price_color));
                    zongyi.setTextColor(this.getResources().getColor(R.color.white_color));
                }
                break;

            default:
                if (currentTopItemIndex == 5) {
                    return;
                } else {
                    currentTopItemIndex = tag;
                    tuijianView.setTextColor(this.getResources().getColor(R.color.white_color));
                    dianying.setTextColor(this.getResources().getColor(R.color.white_color));
                    dianshi.setTextColor(this.getResources().getColor(R.color.white_color));
                    dongman.setTextColor(this.getResources().getColor(R.color.white_color));
                    zongyi.setTextColor(this.getResources().getColor(R.color.hot_price_color));
                }
                break;

        }
        margin = new ViewGroup.MarginLayoutParams(tuijianView.getLayoutParams());
        //Animation.RELATIVE_TO_SELF,  0.0f,这两个其实是一个参数(合并一起看，表示相对定位+坐标变动值)，所以只看2/4/6/8这4个参数
       //第一个值:0.0f表示控件的原始x坐标不变动。
        //第二个值moveStepValue*0.5f表示原始x坐标前提下变动的值
        //第三个值0.0f表示y坐标变动
        //第四个值0.0f表示原始y坐标前提下变动的值
        //重点:这里由于我们只是x坐标左右移动,所以y轴的值一只不变动0.0f 0.0f
        //当moveStepValue为负数时，moveStepValue*0.5f segment是往左移动,正数往右移动，这样动画效果才不会有bug，
        moveAnimation = new TranslateAnimation(Animation.RELATIVE_TO_SELF, 0.0f,
                Animation.RELATIVE_TO_SELF, moveStepValue * 0.5f, Animation.RELATIVE_TO_SELF,
                0.0f, Animation.RELATIVE_TO_SELF, 0.0f);

        //下面的代码是计算动画的执行时间，如果不计算就会出现切换分段数量不一致,指示器的动画执行速度太快或太慢。

        if (moveStepValue < 1) {
            moveStepValue = moveStepValue * -1;
        }
        moveAnimation.setDuration(moveStepValue * 70);
        moveAnimation.setAnimationListener(new Animation.AnimationListener() {
            @Override
            public void onAnimationStart(Animation animation) {
            }

            @Override
            public void onAnimationRepeat(Animation animation) {
            }

            @Override
            public void onAnimationEnd(Animation animation) {

                zhishiqi.clearAnimation();

                //移动效果实现之后，还需要将移动segment分段的margin设置一次，如果不设置动画又会反回去，为什么这样我觉得应该是和android是使用xhtml布局的原因。
                zhishiqilinearParams.setMargins((currentTopItemIndex - 1) * zhishiqiWidth, margin.topMargin, zhishiqiWidth, zhishiqilinearParams.height);
                zhishiqi.setLayoutParams(zhishiqilinearParams);

            }
        });

        zhishiqi.startAnimation(moveAnimation);
        zhishiqi.setVisibility(View.VISIBLE);
    }
}