Android点击左右按钮实现左右滑动页面切换

在android的图片的浏览时候经常使用。最近在网上查找资料自己也做一个如下：
package com.easyway.buttonpageflipper;import com.easyway.buttonpageflipper.R;import android.app.Activity;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.MotionEvent;import android.view.View;import android.view.WindowManager;import android.view.WindowManager.LayoutParams;import android.view.animation.AnimationUtils;import android.widget.ImageView;import android.widget.ViewFlipper;/** * Android实现带渐显按钮的左右滑动效果 自然状态下按钮不可见,触摸屏幕时显示按钮 *  * @author longgangbai *  */public class ButtonpageflipperActivity extends Activity implements OnGestureListener{// 声明两个按钮,分别代表向左和向右滑动private ImageView btnLeft = null;private ImageView btnRight = null;// 设置WindowManagerprivate WindowManager wm = null;private WindowManager.LayoutParams wmParams = null;// ImageView的alpha值private int mAlpha = 0;private boolean isHide;private ViewFlipper viewFlipper = null;private GestureDetector detector;/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);setTitle("Android实现渐显按钮的左右滑动效果");viewFlipper = (ViewFlipper) this.findViewById(R.id.myViewFlipper);detector = new GestureDetector(this);// 初始化左右按钮initImageButtonView();viewFlipper.addView(addImageView(R.drawable.photo1));viewFlipper.addView(addImageView(R.drawable.photo2));viewFlipper.addView(addImageView(R.drawable.photo3));viewFlipper.addView(addImageView(R.drawable.photo4));viewFlipper.addView(addImageView(R.drawable.photo5));} private View addImageView(int id) {ImageView iv = new ImageView(this);iv.setImageResource(id);return iv;}/** * 初始化悬浮按钮 */private void initImageButtonView() {// 获取WindowManagerwm = (WindowManager) getApplicationContext().getSystemService("window");// 设置LayoutParams相关参数wmParams = new WindowManager.LayoutParams();// 设置window typewmParams.type = LayoutParams.TYPE_PHONE;// 设置图片格式,效果为背景透明wmParams.format = PixelFormat.RGBA_8888;// 设置Window flag参数wmParams.flags = LayoutParams.FLAG_NOT_TOUCH_MODAL| LayoutParams.FLAG_NOT_FOCUSABLE;// 设置x、y初始值wmParams.x = 0;wmParams.y = 0;// 设置窗口长宽数据wmParams.width = 50;wmParams.height = 50;// 创建左右按钮createLeftButtonView();createRightButtonView();}/** * 设置左边按钮 */private void createLeftButtonView() {btnLeft = new ImageView(this);btnLeft.setImageResource(R.drawable.left);btnLeft.setAlpha(0);btnLeft.setOnClickListener(new View.OnClickListener() {public void onClick(View arg0) {// 上一个图像viewFlipper.setInAnimation(ButtonpageflipperActivity.this,R.anim.push_left_in);viewFlipper.setOutAnimation(ButtonpageflipperActivity.this,R.anim.push_left_out);viewFlipper.showPrevious();}});// 调整窗口wmParams.gravity = Gravity.LEFT | Gravity.CENTER_VERTICAL;// 显示图像wm.addView(btnLeft, wmParams);}/** * 设置右边按钮 */private void createRightButtonView() {btnRight = new ImageView(this);btnRight.setImageResource(R.drawable.right);btnRight.setAlpha(0);btnRight.setOnClickListener(new View.OnClickListener() {public void onClick(View arg0) {// 下一个图像viewFlipper.setInAnimation(ButtonpageflipperActivity.this,R.anim.push_right_in);viewFlipper.setOutAnimation(ButtonpageflipperActivity.this,R.anim.push_right_out);viewFlipper.showNext();}});// 调整窗口wmParams.gravity = Gravity.RIGHT | Gravity.CENTER_VERTICAL;// 显示图像wm.addView(btnRight, wmParams);}/** * 设置按钮渐显效果 */private Handler mHandler = new Handler() {public void handleMessage(Message msg) {if (msg.what == 1 && mAlpha < 255) {// 通过设置不透明度设置按钮的渐显效果mAlpha += 50;if (mAlpha > 255)mAlpha = 255;btnLeft.setAlpha(mAlpha);btnLeft.invalidate();btnRight.setAlpha(mAlpha);btnRight.invalidate();if (!isHide && mAlpha < 255)mHandler.sendEmptyMessageDelayed(1, 100);} else if (msg.what == 0 && mAlpha > 0) {mAlpha -= 10;if (mAlpha < 0)mAlpha = 0;btnLeft.setAlpha(mAlpha);btnLeft.invalidate();btnRight.setAlpha(mAlpha);btnRight.invalidate();if (isHide && mAlpha > 0)mHandler.sendEmptyMessageDelayed(0, 800);}}};private void showImageButtonView() {isHide = false;mHandler.sendEmptyMessage(1);}private void hideImageButtonView() {new Thread() {public void run() {try {Thread.sleep(1500);isHide = true;mHandler.sendEmptyMessage(0);} catch (Exception e) {;}}}.start();}@Overridepublic boolean onTouchEvent(MotionEvent event) {this.detector.onTouchEvent(event);switch (event.getAction()) {case MotionEvent.ACTION_MOVE:case MotionEvent.ACTION_DOWN:showImageButtonView();break;case MotionEvent.ACTION_UP:hideImageButtonView();break;}return true;}@Overridepublic void onDestroy() {super.onDestroy();// 在程序退出(Activity销毁)时销毁窗口wm.removeView(btnLeft);wm.removeView(btnRight);}  @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.viewFlipper.setInAnimation(AnimationUtils.loadAnimation(this, R.anim.push_left_in));this.viewFlipper.setOutAnimation(AnimationUtils.loadAnimation(this, R.anim.push_left_out));this.viewFlipper.showNext();return true;} else if (e1.getX() - e2.getX() < -120) {this.viewFlipper.setInAnimation(AnimationUtils.loadAnimation(this, R.anim.push_right_in));this.viewFlipper.setOutAnimation(AnimationUtils.loadAnimation(this, R.anim.push_right_out));this.viewFlipper.showPrevious();return true;}return false;}        @Override    public void onLongPress(MotionEvent e) {    // TODO Auto-generated method stub        }        @Override    public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,    float distanceY) {    // TODO Auto-generated method stub    return false;    }        @Override    public void onShowPress(MotionEvent e) {    // TODO Auto-generated method stub        }        @Override    public boolean onSingleTapUp(MotionEvent e) {    // TODO Auto-generated method stub    return false;    }}
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