android 手势检测

android提供了手势检测，并为手势检测提供了相应的监听器

手势检测的类GestureDetector

那么现在我们使用手势检测实现一个小demo ，相当于简单的一个图片浏览器

其实非常简单，首先是XML布局文件：

<?xml version="1.0" encoding="utf-8"?><LinearLayout 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"    tools:context="com.zking.g150715_android21_gesture.MainActivity">    <ViewFlipper        android:layout_width="match_parent"        android:layout_height="match_parent"        android:id="@+id/vf_main_image"        >    </ViewFlipper></LinearLayout>

那么接下来就是java文件

其中相应的方法我在代码中打了注释，一共有6个方法，然后我添加了简单的动画效果，最后我会把动画文件发上来，借鉴就好

package com.zking.g150715_android21_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 implements GestureDetector.OnGestureListener{    private ViewFlipper vf_main_image;    private int images[]={R.drawable.s1,R.drawable.s2,R.drawable.s3};    private GestureDetector gesture;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        vf_main_image = (ViewFlipper) findViewById(R.id.vf_main_image);        //给ViewFilpper设置适配器(不能)        for (int i = 0; i < images.length; i++) {            ImageView iv=new ImageView(this);            iv.setImageResource(images[i]);            vf_main_image.addView(iv);        }        //实例化一个手势检测器的类        gesture = new GestureDetector(this,this);    }    @Override    public boolean onTouchEvent(MotionEvent event) {        return gesture.onTouchEvent(event);    }    @Override    public boolean onDown(MotionEvent motionEvent) {        Log.i("test","按下");        return false;    }    @Override    public void onShowPress(MotionEvent motionEvent) {        Log.i("test","按下，按下但是还没有开始移动");    }    @Override    public boolean onSingleTapUp(MotionEvent motionEvent) {        Log.i("test","按一下");        return false;    }    @Override    public boolean onScroll(MotionEvent motionEvent, MotionEvent motionEvent1, float v, float v1) {        Log.i("test","滑动");        return false;    }    @Override    public void onLongPress(MotionEvent motionEvent) {        Log.i("test","长按");    }    @Override    public boolean onFling(MotionEvent e1, MotionEvent e2, float v, float v1) {        if(e1.getX()-e2.getX()>=200){            Toast.makeText(MainActivity.this, "←←←←←", Toast.LENGTH_SHORT).show();            vf_main_image.showNext();//下一张            //左出左进            vf_main_image.setOutAnimation(this,R.anim.left_out);            vf_main_image.setInAnimation(this,R.anim.left_in);        }else if(e2.getX()-e1.getX()>=200){            Toast.makeText(MainActivity.this, "→→→→→", Toast.LENGTH_SHORT).show();            vf_main_image.showPrevious();//上一张            //右出右进            vf_main_image.setOutAnimation(this,R.anim.right_out);            vf_main_image.setInAnimation(this,R.anim.right_in);        }        return false;    }}

那么，到现在就实现了，右滑上一张的功能和左滑下一张的功能，最后是动画文件

左进动画

<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android"    android:duration="1000"    android:fillAfter="true"    >    <!--左进-->    <translate        android:fromXDelta="-100%p"        android:toXDelta="0"        >    </translate>    <rotate        android:fromDegrees="0"        android:toDegrees="360"        android:pivotY="50%"        android:pivotX="50%"        ></rotate></set>

左出动画

<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android"    android:duration="1000"    android:fillAfter="true"    >    <!--左出-->    <translate        android:fromXDelta="0"        android:toXDelta="-100%p"        >    </translate>    <rotate        android:fromDegrees="0"        android:toDegrees="360"        android:pivotY="50%"        android:pivotX="50%"        ></rotate></set>

右进动画

<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android"    android:duration="1000"    android:fillAfter="true"    >    <!--左出-->    <translate        android:fromXDelta="100%p"        android:toXDelta="0"        >    </translate>    <rotate        android:fromDegrees="0"        android:toDegrees="360"        android:pivotY="50%"        android:pivotX="50%"        ></rotate></set>

右出动画

<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android"    android:duration="1000"    android:fillAfter="true"    >    <!--右出-->    <translate        android:fromXDelta="0"        android:toXDelta="100%p"        >    </translate>    <rotate        android:fromDegrees="0"        android:toDegrees="360"        android:pivotY="50%"        android:pivotX="50%"        ></rotate></set>