Android中ViewFlipper的使用及設定動畫效果執行個體詳解_Android

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本文執行個體講述了Android中ViewFlipper的使用及設定動畫效果。分享給大家供大家參考,具體如下:

說到左右滑動,其實實現左右滑動的方式很多,有ViewPaer,自訂實現Viewgroup,gallery等都可以達到這種效果。這裡做下ViewFliper實現左右滑動的效果。
會用到以下的技術:

1、ViewFlipper
2、GestureDetector
3、Animation

主要是這三個類在起作用。

ViewFlipper,不妨把它看做一個容器吧,你可以把許多的View放在這個容器中,讓它展示給使用者,雖然它每次只展示一個view,我感覺它的用途更好是作為廣告展示,比如類似購物網站那樣的廣告滾動展示。比如可以設定自動播放功能,就可以滾動廣告了!

原理:向左向右滑動主要是依賴手勢來控制,手勢向右滑動就調用 viewFlipper.showNext()方法,同理,向左滑動就會去調用viewFlipper.showPrevious()方法。

效果圖如下:

接下來直接上代碼:

首先在布局檔案中添加ViewFlipper的標籤:

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"   android:layout_width="fill_parent"   android:layout_height="wrap_content"   android:background="@drawable/pattern1" >   <Button     android:id="@+id/treasure_chest_btn"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:layout_alignParentRight="true"     android:background="@drawable/treasure" />   <ViewFlipper     android:id="@+id/viewflipper"     android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:layout_below="@id/treasure_chest_btn" >   </ViewFlipper>   <Button     android:id="@+id/garbage_btn"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:layout_alignParentLeft="true"     android:layout_below="@id/viewflipper"     android:background="@drawable/garbage" /> </RelativeLayout>

其次是在anim中定義動畫:

slide_left_in.xml:

<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" >   <!--    畫面轉換位置移動動畫效果     開始向左動畫    fromXDelta : 動畫開始時 X座標位置    toXDelta :動畫結束時 X座標位置    duration :動畫期間   -->   <translate     android:duration="800"     android:fromXDelta="100%p"     android:toXDelta="0" /> </set>

slide_left_out.xml:

<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" >   <translate     android:duration="800"     android:fromXDelta="0"     android:toXDelta="-100%p" /> </set>

slide_right_in.xml:

<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" >   <translate     android:duration="800"     android:fromXDelta="-100%p"     android:toXDelta="0" /> </set>

slide_right_out.xml:

<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" >   <translate     android:duration="800"     android:fromXDelta="0"     android:toXDelta="100%p" /> </set>

最後是Activity中的實現:

package net.loonggg.demo.slider; import android.app.Activity; import android.os.Bundle; import android.view.GestureDetector; import android.view.GestureDetector.OnGestureListener; import android.view.LayoutInflater; import android.view.MotionEvent; import android.view.View; import android.view.View.OnTouchListener; import android.view.Window; import android.view.animation.Animation; import android.view.animation.Animation.AnimationListener; import android.view.animation.AnimationSet; import android.view.animation.AnimationUtils; import android.widget.Button; import android.widget.ImageView; import android.widget.TextView; import android.widget.ViewFlipper; public class MainActivity extends Activity implements OnGestureListener,     OnTouchListener {   private GestureDetector detector;   private ViewFlipper myViewFlipper;   private int[] imgs = { R.drawable.img0, R.drawable.img1, R.drawable.img2,       R.drawable.img3, R.drawable.img4, R.drawable.img5 };   private int displayedChildIndex = 0;   private Button treasure_btn;   private Button garbage_btn;   @Override   public void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     requestWindowFeature(Window.FEATURE_NO_TITLE);     setContentView(R.layout.main);     myViewFlipper = (ViewFlipper) findViewById(R.id.viewflipper);     treasure_btn = (Button) findViewById(R.id.treasure_chest_btn);     garbage_btn = (Button) findViewById(R.id.garbage_btn);     myViewFlipper.setOnTouchListener(this);     myViewFlipper.setLongClickable(true);// 設定長按事件     // myViewFlipper.setAutoStart(true);// 設定是否自動播放,預設不自動播放     detector = new GestureDetector(this);     addFlipperView();   }   /**    * 向FlipperView中動態添加View    */   private void addFlipperView() {     for (int i = 0; i < imgs.length; i++) {       View view = LayoutInflater.from(this).inflate(           R.layout.myviewflipper, null);       TextView title = (TextView) view.findViewById(R.id.view_title);       title.setText("頭像");       ImageView iv = (ImageView) view.findViewById(R.id.view_image);       iv.setBackgroundResource(imgs[i]);       myViewFlipper.addView(view);     }   }   @Override   public boolean onDown(MotionEvent e) {     return false;   }   @Override   public void onShowPress(MotionEvent e) {   }   @Override   public boolean onSingleTapUp(MotionEvent e) {     return false;   }   @Override   public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,       float distanceY) {     return false;   }   @Override   public void onLongPress(MotionEvent e) {   }   @Override   public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,       float velocityY) {     // 返回當前正在顯示的子視圖的索引     displayedChildIndex = myViewFlipper.getDisplayedChild();     final ImageView iv = (ImageView) myViewFlipper.getChildAt(         displayedChildIndex).findViewById(R.id.view_image);     if (e2.getX() - e1.getX() >= 100 && e1.getY() - e2.getY() >= 100) {       AnimationSet outAnim = (AnimationSet) AnimationUtils.loadAnimation(           this, R.anim.collect_treasure);       iv.startAnimation(outAnim);       outAnim.setAnimationListener(new AnimationListener() {         public void onAnimationStart(Animation animation) {         }         public void onAnimationRepeat(Animation animation) {         }         public void onAnimationEnd(Animation animation) {           showNextView();           AnimationSet downAnim = (AnimationSet) AnimationUtils               .loadAnimation(MainActivity.this, R.anim.up_or_down);           treasure_btn.setAnimation(downAnim);           iv.clearAnimation();         }       });     } else if (e1.getX() - e2.getX() >= 100 && e2.getY() - e1.getY() >= 100) {       AnimationSet outAnim = (AnimationSet) AnimationUtils.loadAnimation(           this, R.anim.throw_garbage);       iv.startAnimation(outAnim);       outAnim.setAnimationListener(new AnimationListener() {         public void onAnimationStart(Animation animation) {         }         public void onAnimationRepeat(Animation animation) {         }         public void onAnimationEnd(Animation animation) {           showNextView();           AnimationSet leftAnim = (AnimationSet) AnimationUtils               .loadAnimation(MainActivity.this,                   R.anim.left_or_right);           garbage_btn.setAnimation(leftAnim);           iv.clearAnimation();         }       });     } else if (e1.getX() - e2.getX() >= 100) {       showNextView();     } else if (e2.getX() - e1.getX() >= 100) {       showPreviousView();     }     return false;   }   private void showPreviousView() {     myViewFlipper.setInAnimation(AnimationUtils.loadAnimation(this,         R.anim.slide_right_in));     myViewFlipper.setOutAnimation(AnimationUtils.loadAnimation(this,         R.anim.slide_right_out));     myViewFlipper.showPrevious();   }   private void showNextView() {     myViewFlipper.setInAnimation(AnimationUtils.loadAnimation(this,         R.anim.slide_left_in));     myViewFlipper.setOutAnimation(AnimationUtils.loadAnimation(this,         R.anim.slide_left_out));     myViewFlipper.showNext();   }   @Override   public boolean onTouch(View v, MotionEvent event) {     return detector.onTouchEvent(event);   } }

希望本文所述對大家Android程式設計有所協助。

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