ViewFlipper动态加载View

转自：http://blog.csdn.net/zhouyuanjing/article/details/8181041

知识点：

     1.ViewFlipper基本用法及动态添加View；

     2.ViewFlipper结合手势翻页+特效；

     3.WindowManager的基本用法。

任意张图片实现循环滑动，其实PageFlipper当前最多的子View个数(ChildViewCount)小于等于2.

源码路径：http://download.csdn.net/detail/zhouyuanjing/4764619

fliper_item.xml:

 "1.0" encoding="utf-8"?>
 "http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:gravity="center" >


         android:id="@+id/img"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:gravity="center" />

main.xml:

 "1.0" encoding="utf-8"?>
 "http://schemas.android.com/apk/res/android"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"
     android:orientation="vertical" >


         android:id="@+id/myViewFlipper"
         android:layout_width="fill_parent"
         android:layout_height="fill_parent" >

MainActivity.java:

 package com.xyz.pagefilter;

 import android.app.Activity;
 import android.content.Context;
 import android.graphics.PixelFormat;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.Message;
 import android.view.GestureDetector;
 import android.view.GestureDetector.OnGestureListener;
 import android.view.Gravity;
 import android.view.LayoutInflater;
 import android.view.MotionEvent;
 import android.view.View;
 import android.view.View.OnTouchListener;
 import android.view.Window;
 import android.view.WindowManager;
 import android.view.WindowManager.LayoutParams;
 import android.widget.ImageView;
 import android.widget.ViewFlipper;

 public class MainActivity extends Activity implements OnTouchListener,
         OnGestureListener {

     private LayoutInflater mInflater;
     private WindowManager wm = null;
     private WindowManager.LayoutParams wmParams = null;

     private ImageView leftbtn = null;
     private ImageView rightbtn = null;

     private int mAlpha = 0;
     private boolean isHide;

     private int mCurrPos = 0;

     private ViewFlipper viewFlipper = null;
     private GestureDetector mGestureDetector;

     private int[] mImages = new int[] { R.drawable.img_0, R.drawable.img_1,
             R.drawable.img_2, R.drawable.img_3, R.drawable.img_4,
             R.drawable.img_5, R.drawable.img_6, R.drawable.img_7,
             R.drawable.img_8, R.drawable.img_9 };

     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         requestWindowFeature(Window.FEATURE_NO_TITLE);
         setContentView(R.layout.main);

         mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
         viewFlipper = (ViewFlipper) this.findViewById(R.id.myViewFlipper);
         setView(mCurrPos, 0);
         initFloatView();

         // viewFlipper.setLongClickable(true);
         viewFlipper.setOnTouchListener(this);
         mGestureDetector = new GestureDetector(this);

     }

     private void initFloatView() {
         wm = (WindowManager) getApplicationContext().getSystemService(
                 Context.WINDOW_SERVICE);
         wmParams = new WindowManager.LayoutParams();

         wmParams.type = LayoutParams.TYPE_PHONE;
         wmParams.format = PixelFormat.RGBA_8888;

         wmParams.flags = LayoutParams.FLAG_NOT_TOUCH_MODAL
                 | LayoutParams.FLAG_NOT_FOCUSABLE;

         wmParams.x = 0;
         wmParams.y = 0;

         wmParams.width = 50;
         wmParams.height = 50;

         createLeftFloatView();
         createRightFloatView();
     }

     private void createLeftFloatView() {
         leftbtn = new ImageView(this);
         leftbtn.setImageResource(R.drawable.prev);
         leftbtn.setAlpha(0);
         leftbtn.setOnClickListener(new View.OnClickListener() {
             public void onClick(View arg0) {
                 movePrevious();
             }
         });

         wmParams.gravity = Gravity.LEFT | Gravity.CENTER_VERTICAL;

         wm.addView(leftbtn, wmParams);
     }

     private void createRightFloatView() {
         rightbtn = new ImageView(this);
         rightbtn.setImageResource(R.drawable.next);
         rightbtn.setAlpha(0);
         rightbtn.setOnClickListener(new View.OnClickListener() {
             public void onClick(View arg0) {
                 moveNext();
             }
         });

         wmParams.gravity = Gravity.RIGHT | Gravity.CENTER_VERTICAL;

         wm.addView(rightbtn, wmParams);
     }

     private void setView(int curr, int next) {
         View v = (View) mInflater.inflate(R.layout.flipper_item, null);
         ImageView iv = (ImageView) v.findViewById(R.id.img);
         // iv.setScaleType(ImageView.ScaleType.FIT_XY);
         if (curr < next && next > mImages.length - 1)
             next = 0;
         else if (curr > next && next < 0)
             next = mImages.length - 1;
         iv.setImageResource(mImages[next]);
         if (viewFlipper.getChildCount() > 1) {
             viewFlipper.removeViewAt(0);
         }
         viewFlipper.addView(v, viewFlipper.getChildCount());
         mCurrPos = next;

     }

     private void movePrevious() {
         setView(mCurrPos, mCurrPos - 1);
         viewFlipper.setInAnimation(MainActivity.this, R.anim.in_leftright);
         viewFlipper.setOutAnimation(MainActivity.this, R.anim.out_leftright);
         viewFlipper.showPrevious();
     }

     private void moveNext() {
         setView(mCurrPos, mCurrPos + 1);
         viewFlipper.setInAnimation(MainActivity.this, R.anim.in_rightleft);
         viewFlipper.setOutAnimation(MainActivity.this, R.anim.out_rightleft);
         viewFlipper.showNext();
     }

     private Handler mHandler = new Handler() {
         public void handleMessage(Message msg) {
             if (msg.what == 1 && mAlpha < 255) {
                 mAlpha += 50;
                 if (mAlpha > 255)
                     mAlpha = 255;
                 leftbtn.setAlpha(mAlpha);
                 leftbtn.invalidate();
                 rightbtn.setAlpha(mAlpha);
                 rightbtn.invalidate();
                 if (!isHide && mAlpha < 255)
                     mHandler.sendEmptyMessageDelayed(1, 100);
             } else if (msg.what == 0 && mAlpha > 0) {
                 mAlpha -= 10;
                 if (mAlpha < 0)
                     mAlpha = 0;
                 leftbtn.setAlpha(mAlpha);
                 leftbtn.invalidate();
                 rightbtn.setAlpha(mAlpha);
                 rightbtn.invalidate();
                 if (isHide && mAlpha > 0)
                     mHandler.sendEmptyMessageDelayed(0, 100);
             }
         }
     };

     private void showFloatView() {
         isHide = false;
         mHandler.sendEmptyMessage(1);
     }

     private void hideFloatView() {
         new Thread() {
             public void run() {
                 try {
                     Thread.sleep(1500);
                     isHide = true;
                     mHandler.sendEmptyMessage(0);
                 } catch (Exception e) {
                 }
             }
         }.start();
     }

     @Override
     public void onDestroy() {
         super.onDestroy();
         wm.removeView(leftbtn);
         wm.removeView(rightbtn);
     }

     @Override
     public boolean onDown(MotionEvent e) {
         return false;
     }

     @Override
     public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
             float velocityY) {
         int x = (int) (e2.getX() - e1.getX());
         if (x > 0) {
             movePrevious();
         } else {
             moveNext();
         }
         return false;
     }

     @Override
     public void onLongPress(MotionEvent e) {

     }

     @Override
     public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
             float distanceY) {
         return false;
     }

     @Override
     public void onShowPress(MotionEvent e) {
         // 用户轻触屏幕，尚末松开或拖动，注意，强调的是没有没有松开或者拖动状态
     }

     @Override
     public boolean onSingleTapUp(MotionEvent e) {
         return false;
     }

     @Override
     public boolean onTouch(View v, MotionEvent event) {
         switch (event.getAction()) {
         case MotionEvent.ACTION_MOVE:
         case MotionEvent.ACTION_DOWN:
             showFloatView();
             break;
         case MotionEvent.ACTION_UP:
             hideFloatView();
             break;
         }
         mGestureDetector.onTouchEvent(event);
         return true;
     }
 }

附加特效文件：

in_leftright.xml:

 "1.0" encoding="utf-8"?>
 "http://schemas.android.com/apk/res/android" >


         android:duration="500"
         android:fromXDelta="-100%p"
         android:toXDelta="0" />


         android:duration="500"
         android:fromAlpha="0.0"
         android:toAlpha="1.0" />

in_rightleft.xml:

 "1.0" encoding="utf-8"?>
 "http://schemas.android.com/apk/res/android" >

         android:duration="500"
         android:fromXDelta="100%p"
         android:toXDelta="0" />


         android:duration="500"
         android:fromAlpha="0.0"
         android:toAlpha="1.0" />

out_leftright.xml:

 "1.0" encoding="utf-8"?>
 "http://schemas.android.com/apk/res/android" >

         android:duration="500"
         android:fromXDelta="0"
         android:toXDelta="100%p" />


         android:duration="500"
         android:fromAlpha="1.0"
         android:toAlpha="0.0" />

out_rightleft.xml:

 "1.0" encoding="utf-8"?>
 "http://schemas.android.com/apk/res/android" >


         android:duration="500"
         android:fromXDelta="0"
         android:toXDelta="-100%p" />


         android:duration="500"
         android:fromAlpha="1.0"
         android:toAlpha="0.0" />

源码路径：http://download.csdn.net/detail/zhouyuanjing/4764619