ImageSwitcher的使用

view：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity"
    android:orientation="vertical">
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/up"
        android:text="上一张"/>
    <ImageSwitcher
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:id="@+id/images"></ImageSwitcher>
<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/down"
    android:text="下一张"/>
</LinearLayout>

java：

public class MainActivity extends ActionBarActivity {

    private int[] imageId=new int[]{R.drawable.img02,R.drawable.img03,R.drawable.img04,R.drawable.img05,
            R.drawable.img06,R.drawable.img07,R.drawable.img08,R.drawable.img09};
    private int index=0; //当前显示的索引
    private ImageSwitcher imageSwitcher;//声明一个图像切换器对象
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        imageSwitcher = (ImageSwitcher) findViewById(R.id.images);

        imageSwitcher.setInAnimation(AnimationUtils.loadAnimation(this,android.R.anim.fade_in));//设置淡入动画
        imageSwitcher.setOutAnimation(AnimationUtils.loadAnimation(this,android.R.anim.fade_out));//设置淡出效果
        imageSwitcher.setFactory(new ViewSwitcher.ViewFactory() {
            @Override
            public View makeView() {
                ImageView imageView=new ImageView(MainActivity.this);
                imageView.setScaleType(ImageView.ScaleType.FIT_CENTER); //设置保持纵横比居中
                imageView.setLayoutParams(new ImageSwitcher.LayoutParams(
                        ActionBar.LayoutParams.WRAP_CONTENT, ActionBar.LayoutParams.WRAP_CONTENT
                ));

                return  imageView;
            }
        });

        imageSwitcher.setImageResource(imageId[index]);

        Button up= (Button) findViewById(R.id.up);
        Button down= (Button) findViewById(R.id.down);

        up.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (index>0){
                    index--;
                }else
                {
                    index=imageId.length-1;
                }
                imageSwitcher.setImageResource(imageId[index]); //显示当前图片
            }
        });

        down.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (index>-1&&index<imageId.length-1){
                    index++;
                }else
                {
                    index=0;
                }
                imageSwitcher.setImageResource(imageId[index]); //显示当前图片
            }
        });

    }


}