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Android技术小结(001)—— Tab页面手势滑动切换以及动画效果

网友分享于:2013-09-07  浏览:102次
Android技术总结(001)—— Tab页面手势滑动切换以及动画效果

效果图。

   

3张页卡之间的切换。带动画效果。

工程结构。


主要应用到android-support-v4.jar这个jar包。

布局文件。

1、main.xml中的代码

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

    <LinearLayout
        android:id="@+id/linearLayout1"
        android:layout_width="fill_parent"
        android:layout_height="100.0dip"
        android:background="#FFFFFF" >

        <TextView
            android:id="@+id/text1"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_weight="1.0"
            android:gravity="center"
            android:text="页卡1"
            android:textColor="#000000"
            android:textSize="22.0dip" />

        <TextView
            android:id="@+id/text2"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_weight="1.0"
            android:gravity="center"
            android:text="页卡2"
            android:textColor="#000000"
            android:textSize="22.0dip" />

        <TextView
            android:id="@+id/text3"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:layout_weight="1.0"
            android:gravity="center"
            android:text="页卡3"
            android:textColor="#000000"
            android:textSize="22.0dip" />
    </LinearLayout>

    <ImageView
        android:id="@+id/cursor"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:scaleType="matrix"
        android:src="@drawable/a" />

    <android.support.v4.view.ViewPager
        android:id="@+id/vPager"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_weight="1.0"
        android:background="#000000"
        android:flipInterval="30"
        android:persistentDrawingCache="animation" />

</LinearLayout>
2、lay1.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#158684"
    android:orientation="vertical" >

</LinearLayout>
3、lay2.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#FF8684"
    android:orientation="vertical" >

</LinearLayout>
4、lay3.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#1586FF"
    android:orientation="vertical" >

</LinearLayout>

主要代码。

/**
 * Tab页面手势滑动切换以及动画效果
 * 
 */
public class MainActivity extends Activity {
    // ViewPager是google SDk中自带的一个附加包的一个类,可以用来实现屏幕间的切换。
    // android-support-v4.jar
    private ViewPager mPager;// 页卡内容
    private List<View> listViews; // Tab页面列表
    private ImageView cursor;// 动画图片
    private TextView t1, t2, t3;// 页卡头标
    private int offset = 0;// 动画图片偏移量
    private int currIndex = 0;// 当前页卡编号
    private int bmpW;// 动画图片宽度

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        InitImageView();
        InitTextView();
        InitViewPager();
    }

    /**
     * 初始化头标
     */
    private void InitTextView() {
        t1 = (TextView) findViewById(R.id.text1);
        t2 = (TextView) findViewById(R.id.text2);
        t3 = (TextView) findViewById(R.id.text3);

        t1.setOnClickListener(new MyOnClickListener(0));
        t2.setOnClickListener(new MyOnClickListener(1));
        t3.setOnClickListener(new MyOnClickListener(2));
    }

    /**
     * 初始化ViewPager
     */
    private void InitViewPager() {
        mPager = (ViewPager) findViewById(R.id.vPager);
        listViews = new ArrayList<View>();
        LayoutInflater mInflater = getLayoutInflater();
        listViews.add(mInflater.inflate(R.layout.lay1, null));
        listViews.add(mInflater.inflate(R.layout.lay2, null));
        listViews.add(mInflater.inflate(R.layout.lay3, null));
        mPager.setAdapter(new MyPagerAdapter(listViews));
        mPager.setCurrentItem(0);
        mPager.setOnPageChangeListener(new MyOnPageChangeListener());
    }

    /**
     * 初始化动画
     */
    private void InitImageView() {
        cursor = (ImageView) findViewById(R.id.cursor);
        bmpW = BitmapFactory.decodeResource(getResources(), R.drawable.a)
                .getWidth();// 获取图片宽度
        DisplayMetrics dm = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(dm);
        int screenW = dm.widthPixels;// 获取分辨率宽度
        offset = (screenW / 3 - bmpW) / 2;// 计算偏移量
        Matrix matrix = new Matrix();
        matrix.postTranslate(offset, 0);
        cursor.setImageMatrix(matrix);// 设置动画初始位置
    }

    /**
     * ViewPager适配器
     */
    public class MyPagerAdapter extends PagerAdapter {
        public List<View> mListViews;

        public MyPagerAdapter(List<View> mListViews) {
            this.mListViews = mListViews;
        }

        @Override
        public void destroyItem(View arg0, int arg1, Object arg2) {
            ((ViewPager) arg0).removeView(mListViews.get(arg1));
        }

        @Override
        public void finishUpdate(View arg0) {
        }

        @Override
        public int getCount() {
            return mListViews.size();
        }

        @Override
        public Object instantiateItem(View arg0, int arg1) {
            ((ViewPager) arg0).addView(mListViews.get(arg1), 0);
            return mListViews.get(arg1);
        }

        @Override
        public boolean isViewFromObject(View arg0, Object arg1) {
            return arg0 == (arg1);
        }

        @Override
        public void restoreState(Parcelable arg0, ClassLoader arg1) {
        }

        @Override
        public Parcelable saveState() {
            return null;
        }

        @Override
        public void startUpdate(View arg0) {
        }
    }

    /**
     * 头标点击监听
     */
    public class MyOnClickListener implements View.OnClickListener {
        private int index = 0;

        public MyOnClickListener(int i) {
            index = i;
        }

        @Override
        public void onClick(View v) {
            mPager.setCurrentItem(index);
        }
    };

    /**
     * 页卡切换监听
     */
    public class MyOnPageChangeListener implements OnPageChangeListener {

        int one = offset * 2 + bmpW;// 页卡1 -> 页卡2 偏移量
        int two = one * 2;// 页卡1 -> 页卡3 偏移量

        @Override
        public void onPageSelected(int arg0) {
            Animation animation = null;
            switch (arg0) {
            case 0:
                if (currIndex == 1) {
                    animation = new TranslateAnimation(one, 0, 0, 0);
                } else if (currIndex == 2) {
                    animation = new TranslateAnimation(two, 0, 0, 0);
                }
                break;
            case 1:
                if (currIndex == 0) {
                    animation = new TranslateAnimation(offset, one, 0, 0);
                } else if (currIndex == 2) {
                    animation = new TranslateAnimation(two, one, 0, 0);
                }
                break;
            case 2:
                if (currIndex == 0) {
                    animation = new TranslateAnimation(offset, two, 0, 0);
                } else if (currIndex == 1) {
                    animation = new TranslateAnimation(one, two, 0, 0);
                }
                break;
            }
            currIndex = arg0;
            animation.setFillAfter(true);// True:图片停在动画结束位置
            animation.setDuration(300);
            cursor.startAnimation(animation);
        }

        @Override
        public void onPageScrolled(int arg0, float arg1, int arg2) {
        }

        @Override
        public void onPageScrollStateChanged(int arg0) {
        }
    }
}



1楼manoel昨天 12:16
不足之处,不吝赐教。

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