20.ViewFilpper+手势实现ViewPager功能+添加动画

xiaoxiao2021-02-28 78

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" >  <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" >  <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

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