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  • android viewflipper的使用 实现图片滑动效果



    package com.homer.viewflipper;
    
    import android.app.Activity;
    import android.os.Bundle;
    import android.view.GestureDetector;
    import android.view.MotionEvent;
    import android.view.ViewGroup.LayoutParams;
    import android.view.animation.Animation;
    import android.view.animation.AnimationUtils;
    import android.widget.ImageView;
    import android.widget.ViewFlipper;
    
    public class ViewFlipperActivity extends Activity implements android.view.GestureDetector.OnGestureListener {
    	private int[] imgs = { R.drawable.img1, R.drawable.img2,
    					  R.drawable.img3, R.drawable.img4, R.drawable.img5 };
    
    	private GestureDetector gestureDetector = null;
    	private ViewFlipper viewFlipper = null;
    
    	private Activity mActivity = null;
    
    	@Override
    	public void onCreate(Bundle savedInstanceState) {
    		super.onCreate(savedInstanceState);
    		setContentView(R.layout.main);
    
    		mActivity = this;
    
    		viewFlipper = (ViewFlipper) findViewById(R.id.viewflipper);
    		gestureDetector = new GestureDetector(this);	// 声明检测手势事件
    
    		for (int i = 0; i < imgs.length; i++) { 			// 添加图片源
    			ImageView iv = new ImageView(this);
    			iv.setImageResource(imgs[i]);
    			iv.setScaleType(ImageView.ScaleType.FIT_XY);
    			viewFlipper.addView(iv, new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
    		}
    		
    		viewFlipper.setAutoStart(true);			// 设置自动播放功能(点击事件,前自动播放)
    		viewFlipper.setFlipInterval(3000);
    		if(viewFlipper.isAutoStart() && !viewFlipper.isFlipping()){
    			viewFlipper.startFlipping();
    		}
    	}
    
    	@Override
    	public boolean onTouchEvent(MotionEvent event) {
    		viewFlipper.stopFlipping();				// 点击事件后,停止自动播放
    		viewFlipper.setAutoStart(false);	
    		return gestureDetector.onTouchEvent(event); 		// 注册手势事件
    	}
    
    	@Override
    	public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
    		if (e2.getX() - e1.getX() > 120) {			 // 从左向右滑动(左进右出)
    			Animation rInAnim = AnimationUtils.loadAnimation(mActivity, R.anim.push_right_in); 	// 向右滑动左侧进入的渐变效果(alpha  0.1 -> 1.0)
    			Animation rOutAnim = AnimationUtils.loadAnimation(mActivity, R.anim.push_right_out); // 向右滑动右侧滑出的渐变效果(alpha 1.0  -> 0.1)
    
    			viewFlipper.setInAnimation(rInAnim);
    			viewFlipper.setOutAnimation(rOutAnim);
    			viewFlipper.showPrevious();
    			return true;
    		} else if (e2.getX() - e1.getX() < -120) {		 // 从右向左滑动(右进左出)
    			Animation lInAnim = AnimationUtils.loadAnimation(mActivity, R.anim.push_left_in);		// 向左滑动左侧进入的渐变效果(alpha 0.1  -> 1.0)
    			Animation lOutAnim = AnimationUtils.loadAnimation(mActivity, R.anim.push_left_out); 	// 向左滑动右侧滑出的渐变效果(alpha 1.0  -> 0.1)
    
    			viewFlipper.setInAnimation(lInAnim);
    			viewFlipper.setOutAnimation(lOutAnim);
    			viewFlipper.showNext();
    			return true;
    		}
    		return true;
    	}
    
    	@Override
    	public boolean onDown(MotionEvent e) {
    		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) {
    	}
    
    	@Override
    	public boolean onSingleTapUp(MotionEvent e) {
    		return false;
    	}
    }
    


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  • 原文地址:https://www.cnblogs.com/aikongmeng/p/3697393.html
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