Android UI開發第八篇——ViewFlipper 左右滑動效果

怎麼實現Android首頁面的左右拖動效果。其實實現起來很簡單，就是使用ViewFlipper來將您要來回拖動的View裝在一起，然後與GestureDetector手勢識別類來聯動，確定要顯示哪個View，加上一點點動畫效果即可。

JAVA

public class TestFlip extends Activity implements OnGestureListener {private ViewFlipper flipper;private GestureDetector detector;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);detector = new GestureDetector(this);flipper = (ViewFlipper) this.findViewById(R.id.ViewFlipper01);flipper.addView(addView(R.layout.layout1));flipper.addView(addView(R.layout.layout2));flipper.addView(addView(R.layout.layout3));flipper.addView(addView(R.layout.layout4));}private View addView(int layout) {LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);View view = inflater.inflate(layout, null);return view;}@Overridepublic boolean onTouchEvent(MotionEvent event) {return this.detector.onTouchEvent(event);}@Overridepublic boolean onDown(MotionEvent e) {// TODO Auto-generated method stubreturn false;}@Overridepublic boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {if (e1.getX() - e2.getX() > 120) {this.flipper.setInAnimation(AnimationUtils.loadAnimation(this, R.anim.push_left_in));this.flipper.setOutAnimation(AnimationUtils.loadAnimation(this, R.anim.push_left_out));this.flipper.showNext();return true;} else if (e1.getX() - e2.getX() < -120) {this.flipper.setInAnimation(AnimationUtils.loadAnimation(this, R.anim.push_right_in));this.flipper.setOutAnimation(AnimationUtils.loadAnimation(this, R.anim.push_right_out));this.flipper.showPrevious();return true;}return false;}@Overridepublic void onLongPress(MotionEvent e) {}@Overridepublic boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {return false;}@Overridepublic void onShowPress(MotionEvent e) {}@Overridepublic boolean onSingleTapUp(MotionEvent e) {return false;}}

XML

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    ><ViewFlipper android:id="@+id/ViewFlipper01"android:layout_width="fill_parent" android:layout_height="fill_parent"></ViewFlipper></LinearLayout>