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package com.example.android21_zhangkai_gesture;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.widget.ImageView;
import android.widget.Toast;
import android.widget.ViewFlipper;

public class MainActivity extends AppCompatActivity {

 private ViewFlipper vf_main_image;
 private int images[]={R.mipmap.ic_launcher,R.mipmap.ic_launcher_round};
 private GestureDetector gd;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);

  vf_main_image = (ViewFlipper) findViewById(R.id.vf_main_image);
  for (int i = 0; i < images.length; i++) {
   ImageView iv=new ImageView(this);
   iv.setImageResource(images[i]);
   vf_main_image.addView(iv);
  }

  //实例化手势检测器类
  gd = new GestureDetector(this, new GestureDetector.OnGestureListener() {
   //按下
   @Override
   public boolean onDown(MotionEvent e) {
    Log.i("test","onDown");
    return false;
   }

   //按下，但是手指还未抬起时调用此方法
   @Override
   public void onShowPress(MotionEvent e) {
    Log.i("test","onShowPress");
   }
   //轻按，按一下，立刻抬起
   @Override
   public boolean onSingleTapUp(MotionEvent e) {
    Log.i("test","onSingleTapUp");
    return false;
   }
   //滚动
   @Override
   public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
    Log.i("test","onScroll");
    return false;
   }
   //长按
   @Override
   public void onLongPress(MotionEvent e) {
    Log.i("test","onLongPress");

   }
   //拖动

   /**
    *
    * @param e1 手指开始滑动时的位置
    * @param e2 手指开始滑动时的位置
    * @param velocityX
    * @param velocityY
    * @return
    */
   @Override
   public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
    Log.i("test","onFling");
    //向右滑，获取手指结束滑动时的X坐标-手指开始滑动时的X坐标，如果大于200，则换图片
    if (e2.getX()-e1.getX()>200){
     Toast.makeText(MainActivity.this, "右滑,上一张", Toast.LENGTH_SHORT).show();
     vf_main_image.showPrevious();//上一张的方法
     //动画为当前图片从右出去，新图从左进来
     vf_main_image.setInAnimation(MainActivity.this,R.anim.left_in);//设置进来的动画
     vf_main_image.setOutAnimation(MainActivity.this,R.anim.right_out);//设置出去的动画
    }else if(e1.getX()-e2.getX()>200){
     Toast.makeText(MainActivity.this, "左滑,下一张", Toast.LENGTH_SHORT).show();
     vf_main_image.showNext();
     //动画为当前图片从左出去，新图从右进来
     vf_main_image.setInAnimation(MainActivity.this,R.anim.right_in);
     vf_main_image.setOutAnimation(MainActivity.this,R.anim.left_out);
    }
    return false;
   }
  });
 }

 //给当前Activity设置触摸事件监听方法
 @Override
 public boolean onTouchEvent(MotionEvent event) {
  return gd.onTouchEvent(event);
 }
}