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