Android基础总结五:ImageSwitcher的使用

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ImageSwitcher是图片切换器，常用于应用的引导界面的设计，下面来总结下它的简单用法：

布局中定义ImageSwitcher

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent">    <ImageSwitcher        android:layout_width="match_parent"        android:layout_height="match_parent"        android:id = "@+id/id_imageswitcher"></ImageSwitcher></RelativeLayout>

代码中实现

public class testActivity extends FragmentActivity implements ViewSwitcher.ViewFactory,View.OnTouchListener{    ImageSwitcher imageSwitcher;    /**     * 当前选中的图片id序号     */    private int currentPosition;    /**     * 按下点的X坐标     */    private float downX;    private int[] imgIds = new int[]{R.drawable.new1,R.drawable.new2,R.drawable.new3};    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.testactivity);        imageSwitcher = (ImageSwitcher)findViewById(R.id.id_imageswitcher);        imageSwitcher.setFactory(this);        imageSwitcher.setOnTouchListener(this);    }    @Override    public View makeView() {        final ImageView i = new ImageView(this);        i.setBackgroundColor(0xff000000);        i.setScaleType(ImageView.ScaleType.CENTER_CROP);        i.setLayoutParams(new ImageSwitcher.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT));        return i ;    }    @Override    public boolean onTouch(View v, MotionEvent event) {        switch (event.getAction()) {            case MotionEvent.ACTION_DOWN:{                //手指按下的X坐标                downX = event.getX();                break;            }            case MotionEvent.ACTION_UP:{                float lastX = event.getX();                //抬起的时候的X坐标大于按下的时候就显示上一张图片                if(lastX > downX){                    if(currentPosition > 0){                        //设置动画，这里的动画比较简单，不明白的去网上看看相关内容                        imageSwitcher.setInAnimation(AnimationUtils.loadAnimation(getApplication(), R.anim.left_in));                        imageSwitcher.setOutAnimation(AnimationUtils.loadAnimation(getApplication(), R.anim.right_out));                        currentPosition --;                        imageSwitcher.setImageResource(imgIds[currentPosition % imgIds.length]);                        // setImageBackground(currentPosition);                    }else{                        Toast.makeText(getApplication(), "已经是第一张", Toast.LENGTH_SHORT).show();                    }                }                if(lastX < downX){                    if(currentPosition < imgIds.length - 1){                        imageSwitcher.setInAnimation(AnimationUtils.loadAnimation(getApplication(), R.anim.right_in));                        imageSwitcher.setOutAnimation(AnimationUtils.loadAnimation(getApplication(), R.anim.left_out));                        currentPosition ++ ;                        imageSwitcher.setImageResource(imgIds[currentPosition]);                        // setImageBackground(currentPosition);                    }else{                        Toast.makeText(getApplication(), "到了最后一张", Toast.LENGTH_SHORT).show();                    }                }            }            break;        } return true;    }}

主要是继承了ViewSwitcher.ViewFactory方法，重写makeView()

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