本节引言:
1.为ViewFlipper加入View的两种方法
1)静态导入
2)动态导入
2.常用的一些方法
3.使用实例
1)示例1:使用ViewFlipper实现图片轮播(静态导入)
实现效果图:
实现代码:
每个页面的布局都是一个简单的ImageView,这里就不贴了~先贴下两个进入以及 离开的动画:
right_in.xml:
<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android"> <translate android:duration="2000" android:fromXDelta="100%p" android:toXDelta="0" /> </set>
right_out.xml:
<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" > <translate android:duration="2000" android:fromXDelta="0" android:toXDelta="-100%p" /> </set>
然后是activity_main.xml布局文件:
<RelativeLayout 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" tools:context=".MainActivity"> <ViewFlipper android:id="@+id/vflp_help" android:layout_width="match_parent" android:layout_height="match_parent" android:inAnimation="@anim/right_in" android:outAnimation="@anim/right_out" android:flipInterval="3000"> <include layout="@layout/page_help_one" /> <include layout="@layout/page_help_two" /> <include layout="@layout/page_help_three" /> <include layout="@layout/page_help_four" /> </ViewFlipper> </RelativeLayout>
这里我们设置了flipInterval = 3000,即每隔3000ms切还一个~ 最后我们只需在MainActivity.java中调用ViewFlipper的startFlipping()方法开始滑动!
MainActivity.java:
public class MainActivity extends AppCompatActivity { private ViewFlipper vflp_help; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); vflp_help = (ViewFlipper) findViewById(R.id.vflp_help); vflp_help.startFlipping(); } }
2)示例2:支持手势滑动的ViewFlipper(动态导入)
实现效果图:
代码实现:
因为我们分为进入上一页,进入下一页,所以除了上面的两个动画外,我们再添加两个动画:
left_in.xml:
<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" > <translate android:duration="500" android:fromXDelta="-100%p" android:toXDelta="0" /> </set>
left_out.xml:
<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android"> <translate android:duration="500" android:fromXDelta="0" android:toXDelta="100%p" /> </set>
MainActivity.java:
public class MainActivity extends AppCompatActivity { private Context mContext; private ViewFlipper vflp_help; private int[] resId = {R.mipmap.ic_help_view_1,R.mipmap.ic_help_view_2, R.mipmap.ic_help_view_3,R.mipmap.ic_help_view_4}; private final static int MIN_MOVE = 200; //最小距离 private MyGestureListener mgListener; private GestureDetector mDetector; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mContext = MainActivity.this; //实例化SimpleOnGestureListener与GestureDetector对象 mgListener = new MyGestureListener(); mDetector = new GestureDetector(this, mgListener); vflp_help = (ViewFlipper) findViewById(R.id.vflp_help); //动态导入添加子View for(int i = 0;i < resId.length;i++){ vflp_help.addView(getImageView(resId[i])); } } //重写onTouchEvent触发MyGestureListener里的方法 @Override public boolean onTouchEvent(MotionEvent event) { return mDetector.onTouchEvent(event); } //自定义一个GestureListener,这个是View类下的,别写错哦!!! private class MyGestureListener extends GestureDetector.SimpleOnGestureListener { @Override public boolean onFling(MotionEvent e1, MotionEvent e2, float v, float v1) { if(e1.getX() - e2.getX() > MIN_MOVE){ vflp_help.setInAnimation(mContext,R.anim.right_in); vflp_help.setOutAnimation(mContext, R.anim.right_out); vflp_help.showNext(); }else if(e2.getX() - e1.getX() > MIN_MOVE){ vflp_help.setInAnimation(mContext,R.anim.left_in); vflp_help.setOutAnimation(mContext, R.anim.left_out); vflp_help.showPrevious(); } return true; } } private ImageView getImageView(int resId){ ImageView img = new ImageView(this); img.setBackgroundResource(resId); return img; } }
代码要点解析:
4.代码示例下载
ViewFlipperDemo.zip
ViewFlipperDemo2.zip