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WindowManager
	private 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. */
	@Override
	public 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WindowManager
		wm = (WindowManager) getApplicationContext().getSystemService("window");
		// 设置LayoutParams相关参数
		wmParams = new WindowManager.LayoutParams();
		// 设置window type
		wmParams.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();
	}

	@Override
	public 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;
	}

	@Override
	public void onDestroy() {
		super.onDestroy();
		// 在程序退出(Activity销毁)时销毁窗口
		wm.removeView(btnLeft);
		wm.removeView(btnRight);
	}

	  @Override
		public boolean onDown(MotionEvent e) {
			// TODO Auto-generated method stub
			return false;
		}
	    
	    @Override
		public 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;
	    }
	}