Android界面编程之ViewSwitcher

ViewSwitcher：
ViewSwitcher可以用factory提供视图，也可以自己添加，最多只能有两个子视图，且任何时候只能显示其中一个。
如此，可以猜测到该控件的工作过程：
(1)为ViewSwitcher指定factory对象
(2)为ViewSwitcher的视图提供布局
(3)让ViewSwitcher翻页(按钮或者触屏滑动)

示例：实现图片切换

布局

<ViewSwitcher        android:id="@+id/viewSwitcher1"        android:layout_width="match_parent"        android:layout_height="400dp"        tools:layout_editor_absoluteY="8dp"        tools:layout_editor_absoluteX="8dp"        app:layout_constraintLeft_toLeftOf="parent"/>    <Button        android:id="@+id/butten_prev"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="上一页"        android:onClick="prev"        app:layout_constraintTop_toBottomOf="@+id/viewSwitcher1"/>    <Button        android:id="@+id/butten_next"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="下一页"        android:onClick="next"        app:layout_constraintTop_toBottomOf="@id/viewSwitcher1"        app:layout_constraintLeft_toRightOf="@id/butten_prev"/>

MainActivity:

public class MainActivity extends AppCompatActivity {    private ViewSwitcher viewSwitcher;    private int[] images = new int[]{R.drawable.img1,R.drawable.img2,            R.drawable.img3,R.drawable.img4,R.drawable.img5};    private int index = 0;    private LayoutInflater inflater;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        viewSwitcher=(ViewSwitcher)findViewById(R.id.viewSwitcher1);        inflater = LayoutInflater.from(this);        viewSwitcher.setFactory(new ViewSwitcher.ViewFactory() {            @Override            public View makeView() {                ImageView imageView = new ImageView(getApplicationContext());                return imageView;            }        });        next(null);    }    public void prev(View view){        viewSwitcher.setInAnimation(this,R.anim.slide_in_right);        viewSwitcher.setOutAnimation(this,R.anim.slide_out_left);        index--;        if (index<0)            index=images.length-1;        ImageView imageView = (ImageView)viewSwitcher.getNextView();        imageView.setImageResource(images[index]);        viewSwitcher.showPrevious();    }    public void next(View view){        viewSwitcher.setInAnimation(this, android.R.anim.slide_in_left);        viewSwitcher.setOutAnimation(this,android.R.anim.slide_out_right);        index++;        if (index>images.length-1)            index=0;        ImageView imageView = (ImageView)viewSwitcher.getNextView();        imageView.setImageResource(imagext();    }}

当然，也可以自己定义动画:

<translate        android:fromXDelta="100%p"        android:toXDelta="0%p"        android:duration="600"/><alpha android:fromAlpha="1"        android:toAlpha="1"        android:duration="600"/>