手势检测(一)

/*功能：根据用户的不同动作检测判定触发的是哪种手势动作*/
package com.example.android_gesture_1;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.view.GestureDetector;
import android.view.GestureDetector.OnGestureListener;
import android.view.MotionEvent;
import android.widget.Toast;
public class GestureTest extends Activity
 implements OnGestureListener
{
 //1.定义手势检测实例
 GestureDetector detector;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
 //2.创建手势检测器:this-表明该Activity本身会作为GestureDetector.OnGestureListener监听器
  detector=new GestureDetector(this,this);
 }
 //3.指定把Activity的TouchEvent交给GestureDetector处理
 @Override
 public boolean onTouchEvent(MotionEvent event) {
  return detector.onTouchEvent(event);
 }
 //4.手势检测判定--------------------------------------------/
 @Override	//a.当触碰事件按下时触发
 public boolean onDown(MotionEvent e) {
//	 Toast.makeText(this, "onDown:当触碰事件按下时触发", Toast.LENGTH_SHORT).show();
  return false;
 }
 @Override	//b.当用户在触摸屏上按下，而且还未移动和松开
 public void onShowPress(MotionEvent e) {
//	 Toast.makeText(this, "onShowPress:当用户在触摸屏上按下，而且还未移动和松开", Toast.LENGTH_SHORT).show();
 }
 @Override	//c.当用户在触摸屏上的轻击事件将会触发该方法
 public boolean onSingleTapUp(MotionEvent e) {
//	 Toast.makeText(this, "onSingleTapUp：当用户在触摸屏上的轻击事件将会触发该方法", Toast.LENGTH_SHORT).show();
  return false;
 }
 @Override	//d.当用户在屏幕上“滚动”时触发该方法
 public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
   float distanceY) {
 //	Toast.makeText(this, "onScroll：当用户在屏幕上“滚动”时触发该方法", Toast.LENGTH_SHORT).show();
  return false;
 }
 @Override	//e.当用户在屏幕长按时触发该方法
 public void onLongPress(MotionEvent e) {
  Toast.makeText(this, "onLongPress：当用户在屏幕长按时触发该方法", Toast.LENGTH_SHORT).show();
 }
 @Override	//f.当用户在触摸屏上“拖过”时触发该方法
 public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
   float velocityY) {
  Toast.makeText(this, "onFling:当用户在触摸屏上“拖过”时触发该方法", Toast.LENGTH_SHORT).show();
  Intent intent=new Intent(Intent.ACTION_VIEW, ContactsContract.Contacts.CONTENT_URI);	//启动联系人
  startActivity(intent);
  return false;
 }
}

package com.example.android_gesture_2;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.view.GestureDetector;
import android.view.GestureDetector.OnGestureListener;
import android.view.MotionEvent;
import android.widget.ImageView;
public class GestureZoom extends Activity implements OnGestureListener
{
 //1.定义手势检测器实例
 GestureDetector detector;
 ImageView imageview;
 //2.图片相关资源初始化
 Bitmap bitmap;	 //初始的图片资源
 int width,height;	 //定义图片的宽、高
 float currentScale = 1; //记录当前的缩放比例
 Matrix matrix;	 //控制图片缩放的Matrix对象
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.mian);
 //3.创建手势检测器
  detector=new GestureDetector(this,this);
  imageview=(ImageView)findViewById(R.id.image);
  matrix = new Matrix();
 //4.获取被缩放的源图片
  bitmap=BitmapFactory.decodeResource(this.getResources(),R.drawable.flower);
  width=bitmap.getWidth();	//获取位图宽
  height=bitmap.getHeight();	//获取位图高
  imageview.setImageBitmap(BitmapFactory.decodeResource(this.getResources(), R.drawable.flower));//设置ImageView初始化时显示的图片
 }
 //5.把Activity的OnTouch事件交给GestureDetector处理
 @Override
 public boolean onTouchEvent(MotionEvent event) {
  return detector.onTouchEvent(event);
 }
 //6.手势判定并响应----------------------------------------------------//
 @Override
 public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
   float velocityY) {
  velocityX=velocityX>4000?4000:velocityX;	//横向上的拖动速度velocityX（放大）
  velocityX=velocityX<-4000?-4000:velocityX;	//横向上的拖动速度velocityX（缩小）
  //a.根据手势的速度来计算缩放比例，如果velocityX>0，放大图像，否者缩小图像
  currentScale +=currentScale*velocityX/4000.0f;
  currentScale=currentScale>0.01?currentScale:0.01f;	 //保证currentScale不会等于0
  matrix.reset();	 //重置Matrix
  matrix.setScale(currentScale, currentScale, 160, 200);	//缩放Matrix
  BitmapDrawable tmp=(BitmapDrawable)imageview.getDrawable();
  if(!tmp.getBitmap().isRecycled())	//如果图片还未收回，先强制收回该图片
  {
   tmp.getBitmap().recycle();
  }
  Bitmap bitmap2=Bitmap.createBitmap(bitmap, 0, 0, width,height,matrix,true);//根据原始图位和Matrix创建新图片
  imageview.setImageBitmap(bitmap2);//显示新的位图
  return true;
 }
 //-----------------------------------------------------------------//
 @Override
 public boolean onDown(MotionEvent e) {
  // 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;
 }
 @Override
 public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
   float distanceY) {
  // TODO Auto-generated method stub
  return false;
 }
 @Override
 public void onLongPress(MotionEvent e) {
  // TODO Auto-generated method stub
 
 }
 
}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:paddingBottom="@dimen/activity_vertical_margin" 
android:paddingLeft="@dimen/activity_horizontal_margin" 
android:paddingRight="@dimen/activity_horizontal_margin" 
android:paddingTop="@dimen/activity_vertical_margin" 
tools:context="com.example.android_gesture_3.GestureFlip" > 

<!-- 定义ViewFlipper组件 --> 
<ViewFlipper 
android:id="@+id/flipper" 
android:layout_width="match_parent" 
android:layout_height="match_parent"/> 
</RelativeLayout>

package com.example.android_gesture_3;
import android.app.Activity;
import android.os.Bundle;
import android.view.GestureDetector;
import android.view.GestureDetector.OnGestureListener;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.ImageView;
import android.widget.ViewFlipper;
public class GestureFlip extends Activity implements OnGestureListener {
 //1.定义ViewFlipper、手势检测、动画数组实例
 ViewFlipper flipper;
 GestureDetector detector;
 Animation[] animations=new Animation[4];	//定义一个动画数组，用于为ViewFlipper指定切换动画效果
 final int FLIP_DISTANCE=50;	 //定义手势动作两点之间的最小距离
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
 //2.创建手势检测器
  detector=new GestureDetector(this,this);
 //3.ViewFlipper、Animation初始化
  flipper=(ViewFlipper)findViewById(R.id.flipper);	//获取ViewFlipper组件
  flipper.addView(addImageView(R.drawable.photo1)); //为ViewFlipper添加5个ImageView组件
  flipper.addView(addImageView(R.drawable.photo2));
  flipper.addView(addImageView(R.drawable.photo3));
  flipper.addView(addImageView(R.drawable.photo4));
  flipper.addView(addImageView(R.drawable.photo5));
  animations[0] = AnimationUtils.loadAnimation(this,R.anim.abc_slide_out_top);//初始化Animation数组
  animations[1] = AnimationUtils.loadAnimation(this,R.anim.abc_slide_in_top);
  animations[2] = AnimationUtils.loadAnimation(this,R.anim.abc_slide_out_bottom);
  animations[3] = AnimationUtils.loadAnimation(this,R.anim.abc_slide_in_bottom);
  }
 //4.定义添加ImageView的工具方法
 private View addImageView(int resId) {
  ImageView imageView = new ImageView(this);
  imageView.setImageResource(resId);
  imageView.setScaleType(ImageView.ScaleType.CENTER);
  return imageView;
 }
 //5.将该Activity上的触碰事件交给GestureDetector处理
 @Override
 public boolean onTouchEvent(MotionEvent event) {
  return detector.onTouchEvent(event);
 }
 //6.在触摸屏上“拖过”时触发该方法
 @Override
 public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
   float velocityY) {
  //如果第一个触点事件的X坐标大于第二触发事件的X坐标超过FLIP_DISTANCE
  //也就是手势从右向左滑
  if(e1.getX()-e2.getX()>FLIP_DISTANCE)
  {
   //为flipper设置切换的动画效果
   flipper.setAnimation(animations[0]);
   flipper.setAnimation(animations[1]);
   flipper.showPrevious();
   return true;
  }
  //如果第二个触点事件的X坐标大于第一个触点事件的X坐标超过FLIP_DISTANCE
  else if(e2.getX()-e1.getX()>FLIP_DISTANCE)
  {
   //为flipper设置切换的动画效果
   flipper.setAnimation(animations[2]);
   flipper.setAnimation(animations[3]);
   flipper.showPrevious();
   return true;
  }
  return false;
 }
 //-------------------------------------------------------------------------//
 @Override
 public boolean onDown(MotionEvent e) {
   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;
 }
}