20.ViewFilpper+手势实现ViewPager功能+添加动画

一:知识概要

二:案例

1.效果图

2.代码树状图

3.案例中使用的图片

4.具体实现代码

a.布局activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.zking.android20_gesture.MainActivity">

    <ViewFlipper
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/vf_main_image"
        >
    </ViewFlipper>

</LinearLayout>

b.Java代码MainActivity.java

package com.zking.android20_gesture;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
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.drawable.s1,R.drawable.s2,R.drawable.s3};//图片数组
    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]);//给每一个控件设置一个图片
                vf_main_image.addView(iv);
            }

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

                    //按下，但是还未抬起
                    @Override
                    public void onShowPress(MotionEvent e) {
                        Log.i("test","按下去，还没松开之前会调onShowPress");
                    }

                    //轻按，按一下，立刻抬起
                    @Override
                    public boolean onSingleTapUp(MotionEvent e) {
                        Log.i("test","轻按/按一下就抬起会调onSingleTapUp");
                        return false;
                    }

                    //滚动
                    @Override
                    public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
                        Log.i("test","滚动onScroll");
                        return false;
                    }

                    //长按
                    @Override
                    public void onLongPress(MotionEvent e) {
                        Log.i("test","长按onLongPress");
                    }

                    //拖动
                    @Override
                    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
                        Log.i("test","滚完之后，最后调拖动onFling");
                        //右滑:左边e1代表起点，右边代表终点e2 (x轴坐标)
                        //判断
                        if(e2.getX()-e1.getX()>200){//起点与终点的距离>200
                            Toast.makeText(MainActivity.this, "右滑,上一张", Toast.LENGTH_SHORT).show();
                            vf_main_image.showPrevious();//实现上一张功能
                            //动画效果
                            //左进右出
                            vf_main_image.setInAnimation(MainActivity.this,R.anim.left_in);
                            vf_main_image.setOutAnimation(MainActivity.this,R.anim.right_out);
                        }
                        //左滑
                        if(e1.getX()-e2.getX()>200){//不能else
                            Toast.makeText(MainActivity.this, "左滑,下一张", Toast.LENGTH_SHORT).show();
                            vf_main_image.showNext();//实现下一张功能
                            //左出右进
                            vf_main_image.setInAnimation(MainActivity.this,R.anim.right_in);
                            vf_main_image.setOutAnimation(MainActivity.this,R.anim.left_out);
                        }
                        return false;
                    }
            });
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        Log.i("test","触摸onTouchEvent");
        return gd.onTouchEvent(event);
    }




}

c.动画

left_in.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:fillAfter="true"
    android:duration="1000"
    >

    <!--左进-->

     <translate
         android:fromXDelta="-100%p"
         android:toXDelta="0"
         ></translate>

    <rotate
        android:fromDegrees="0"
        android:toDegrees="360"
        android:pivotX="50%"
        android:pivotY="50%"
        ></rotate>

</set>

left_out.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:fillAfter="true"
    android:duration="1000"
    >
    <!--左出-->

    <!--移到屏幕外面去-->
     <translate
         android:fromXDelta="0"
         android:toXDelta="-100%p"
         >
     </translate>
    <!--旋转:从0度旋出去-->
    <rotate
        android:fromDegrees="0"
        android:toDegrees="-360"
        android:pivotX="50%"
        android:pivotY="50%"
        >
    </rotate>

</set>

right_in.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:fillAfter="true"
    android:duration="1000"
    >

    <!--右进-->

     <translate
         android:fromXDelta="100%p"
         android:toXDelta="0"
         ></translate>

    <rotate
        android:fromDegrees="0"
        android:toDegrees="-360"
        android:pivotX="50%"
        android:pivotY="50%"
        ></rotate>

</set>

right_out.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:fillAfter="true"
    android:duration="1000"
    >

    <!--右出-->
     <translate
         android:fromXDelta="0"
         android:toXDelta="100%p"
         ></translate>

    <rotate
        android:fromDegrees="0"
        android:toDegrees="360"
        android:pivotX="50%"
        android:pivotY="50%"
        ></rotate>

</set>

5.查看执行效果