Android 实现答题器功能（通过手势实现翻页效果）

怼烎@ 2022-08-21 13:39 538阅读 0赞

## 1.问题描述 ##

Android答题器的实现主要使用了ViewFilpper和GestureDetector来实现。

## 2.实现思路 ##

把Activity的TouchEvent事件交个GestureDetector来处理，然后使用ViewFilpper使用动画控制多个组件的之间的切换效果。手势的一个Api就不详细说了，大家如果不了解可以查一下。

## 3.实现的步骤 ##

1.  构建手势检测器
2.  准备数据
3.  为ViewFilpper添加子控件。
4.  初始化Animation数组
5.  把Activity的TouchEvent事件交个GestureDetector来处理
6.  实现 onFling方法

## 4.代码实现 ##

### 4.1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" android:orientation="vertical" tools:context="com.lidong.demo.view.GestureFilpActivity">
    
        <ViewFlipper android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/viewFlipper"/>
    </LinearLayout>

### 4.2 动画文件 ###

left\_in.xml

<?xml version="1.0" encoding="utf-8"?>
    <set xmlns:android="http://schemas.android.com/apk/res/android">
        <translate android:fromXDelta="100%p" android:toXDelta="0" android:duration="500" />
    </set>

left\_out.xml

<?xml version="1.0" encoding="utf-8"?>
    <set xmlns:android="http://schemas.android.com/apk/res/android">
        <translate android:fromXDelta="0" android:toXDelta="-100%p" android:duration="500" />
    </set>

right\_in.xml

<?xml version="1.0" encoding="utf-8"?>
    <set xmlns:android="http://schemas.android.com/apk/res/android">
        <translate android:fromXDelta="-100%p" android:toXDelta="0" android:duration="500" />
    </set>

right\_out.xml

<?xml version="1.0" encoding="utf-8"?>
    <set xmlns:android="http://schemas.android.com/apk/res/android">
        <translate android:fromXDelta="0" android:toXDelta="100%p" android:duration="500" />
    </set>

### 4.3GestureFilpActivity的实现 ###

package com.lidong.demo.view;
    
    import android.os.Bundle;
    import android.view.GestureDetector;
    import android.view.MotionEvent;
    import android.view.View;
    import android.view.animation.Animation;
    import android.view.animation.AnimationUtils;
    import android.widget.AdapterView;
    import android.widget.ListView;
    import android.widget.TextView;
    import android.widget.Toast;
    import android.widget.ViewFlipper;
    
    import com.lidong.demo.AppComponent;
    import com.lidong.demo.BaseActivity;
    import com.lidong.demo.R;
    import com.lidong.demo.view.adapter.ChineseMedicineReportAdapter;
    import com.lidong.demo.view.model.Question;
    
    import java.util.ArrayList;
    import java.util.List;
    
    import butterknife.Bind;
    import butterknife.ButterKnife;
    /** *@类名 : GestureFilpActivity *@描述 : *@时间 : 2016/5/3 16:11 *@作者: 李东 *@邮箱 : lidong@chni.com.cn *@company: chni */
    public class GestureFilpActivity extends BaseActivity implements GestureDetector.OnGestureListener{
    
        @Bind(R.id.viewFlipper)
        ViewFlipper mViewFlipper;
        //1.定义手势检测器对象
        GestureDetector mGestureDetector;
        //2.定义一个动画数组，用于为ViewFilpper指定切换动画效果。
        Animation[]  animations = new  Animation[4];
        //3.定义手势两点之间的最小距离
        final int FLIP_DISTANCE = 50 ;
    
        List<Question> mQuestion =  new ArrayList<>();
        ChineseMedicineReportAdapter adapter;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_gesture_filp);
            ButterKnife.bind(this);
            setActivityTitle("答题器的实现");
            //1.构建手势检测器
            mGestureDetector =  new GestureDetector(this,this);
            //2准备数据
            List<Question> questions = initData();
            mQuestion.addAll(questions);
            //3.为ViewFilpper添加子控件。
            for (int i = 0;i<mQuestion.size();i++){ 
                Question question = mQuestion.get(i);
                mViewFlipper.addView(addQuestionView(question));
            }
            //4.初始化Animation数组
            animations[0] = AnimationUtils.loadAnimation(this,R.anim.left_in);
            animations[1] = AnimationUtils.loadAnimation(this,R.anim.left_out);
            animations[2] = AnimationUtils.loadAnimation(this,R.anim.right_in);
            animations[3] = AnimationUtils.loadAnimation(this,R.anim.right_out);
    
        }
    
        @Override
        protected void setupActivityComponent(AppComponent appComponent) {
    
        }
    
        private View  addQuestionView(Question question){
            View view = View.inflate(this, R.layout.activity_chnihealthreport, null);
            TextView tes = (TextView) view.findViewById(R.id.tv_question);
            ListView listview = (ListView) view.findViewById(R.id.lv_question_answer);
            adapter = new ChineseMedicineReportAdapter(this,question);
            listview.setAdapter(adapter);
            tes.setText(question.getQuestion());
            listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                @Override
                public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                    Toast.makeText(GestureFilpActivity.this,position+"",Toast.LENGTH_SHORT).show();
                    Toast.makeText(GestureFilpActivity.this,position+"",Toast.LENGTH_SHORT).show();
                    if (mViewFlipper.getDisplayedChild() == mQuestion.size() - 1) {
                        Toast.makeText(GestureFilpActivity.this,"最后一个题",Toast.LENGTH_SHORT).show();
                        mViewFlipper.stopFlipping();
                        return;
                    }else {
                        mViewFlipper.setInAnimation(animations[0]);
                        mViewFlipper.setOutAnimation(animations[1]);
                        mViewFlipper.showNext();
                    }
                }
            });
            return view;
        }
    
    
    
    
        @Override
        public boolean onDown(MotionEvent e) {
            return false;
        }
    
        @Override
        public void onShowPress(MotionEvent e) {
    
        }
    
        @Override
        public boolean onSingleTapUp(MotionEvent e) {
            return false;
        }
    
        @Override
        public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
            return false;
        }
    
        @Override
        public void onLongPress(MotionEvent e) {
    
        }
         //重点实现在这里切换
        @Override
        public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
            if (e2.getX() - e1.getX()>FLIP_DISTANCE){
                if (mViewFlipper.getDisplayedChild() == 0) {
                    mViewFlipper.stopFlipping();
                    Toast.makeText(GestureFilpActivity.this,"第一个题",Toast.LENGTH_SHORT).show();
                    return false;
                } else {
                    mViewFlipper.setInAnimation(animations[2]);
                    mViewFlipper.setOutAnimation(animations[3]);
                    mViewFlipper.showPrevious();
                    return  true;
                }
            }else if (e1.getX() - e2.getX()>FLIP_DISTANCE){
                if (mViewFlipper.getDisplayedChild() == mQuestion.size() - 1) {
                    Toast.makeText(GestureFilpActivity.this,"最后一个题",Toast.LENGTH_SHORT).show();
                    mViewFlipper.stopFlipping();
                    return false;
                }else {
                    mViewFlipper.setInAnimation(animations[0]);
                    mViewFlipper.setOutAnimation(animations[1]);
                    mViewFlipper.showNext();
                    return true;
                }
            }
            return false;
        }
    
    
        @Override
        public boolean onTouchEvent(MotionEvent event) {
            //将Activity上的触发的事件交个GestureDetector处理
            return this.mGestureDetector.onTouchEvent(event);
        }
    
        private List<Question> initData(){
           List<Question> questions = new ArrayList<>();
           Question q1 = new Question();
           q1.setQuestion("1、\"红娘\"由来是出自下列哪部古典名剧:");
           List<Question.Answer> mA = new ArrayList<>();
           Question.Answer  a1 = new Question.Answer();
           a1.setAnswerMessage("A《琵琶记》");
           Question.Answer  a2 = new Question.Answer();
           a2.setAnswerMessage("B《西厢记》");
           Question.Answer  a3 = new Question.Answer();
           a3.setAnswerMessage("C《长生殿》");
           Question.Answer  a4 = new Question.Answer();
           a4.setAnswerMessage("D《桃花扇》");
           mA.add(a1);
           mA.add(a2);
           mA.add(a3);
           mA.add(a4);
           q1.setAnswer(mA);
           questions.add(q1);
    
           Question q2 = new Question();
           q2.setQuestion("2.我国第一部有声影片是：");
           List<Question.Answer> mB = new ArrayList<>();
           Question.Answer  b1 = new Question.Answer();
           b1.setAnswerMessage("A《歌女红牡丹》");
           Question.Answer  b2 = new Question.Answer();
           b2.setAnswerMessage("B《定军山》");
           Question.Answer  b3 = new Question.Answer();
           b3.setAnswerMessage("C《林则徐》");
           Question.Answer  b4 = new Question.Answer();
           b4.setAnswerMessage("D《玉人何处》");
           mB.add(b1);
           mB.add(b2);
           mB.add(b3);
           mB.add(b4);
           q2.setAnswer(mB);
           questions.add(q2);
           Question q3= new Question();
           q3.setQuestion("3.下列哪座山不属于我国四大佛山之一：（ A）");
           List<Question.Answer> mC = new ArrayList<>();
           Question.Answer  c1 = new Question.Answer();
           c1.setAnswerMessage("A《歌女红牡丹》");
           Question.Answer  c2 = new Question.Answer();
           c2.setAnswerMessage("B《定军山》");
           Question.Answer  c3 = new Question.Answer();
           c3.setAnswerMessage("C《林则徐》");
           Question.Answer  c4 = new Question.Answer();
           c4.setAnswerMessage("D《玉人何处》");
           mC.add(c1);
           mC.add(c2);
           mC.add(c3);
           mC.add(c4);
           q3.setAnswer(mC);
           questions.add(q3);
           Question q4 = new Question();
           q4.setQuestion("4.下面哪个是对“惊蛰”这个节气的正确描述？");
           List<Question.Answer> mD = new ArrayList<>();
           Question.Answer  d1 = new Question.Answer();
           d1.setAnswerMessage("A《歌女红牡丹》");
           Question.Answer  d2 = new Question.Answer();
           d2.setAnswerMessage("B《定军山》");
           Question.Answer  d3 = new Question.Answer();
           d3.setAnswerMessage("C《林则徐》");
           Question.Answer  d4 = new Question.Answer();
           d4.setAnswerMessage("D《玉人何处》");
           mD.add(d1);
           mD.add(d2);
           mD.add(d3);
           mD.add(d4);
           q4.setAnswer(mD);
           questions.add(q4);
    
           return questions;
       }
    }

## 5.总结 ##

1.构建手势检测器，2准备数据，3为ViewFilpper添加子控件。4.初始化Animation数组。5.把Activity的TouchEvent事件交个GestureDetector来处理,6.实现 onFling方法

[代码下载][Link 1]  
效果图：  
![这里写图片描述][20160503164536388] ![这里写图片描述][20160503164602992]

[Link 1]: https://github.com/lidong1665/AndroidRapidLibrary/tree/master/Android-Rapid-Development-Of-Library/app/src/main/java/com/lidong/demo/view
[20160503164536388]: https://img-blog.csdn.net/20160503164536388
[20160503164602992]: /images/20220724/07522b11c9cc4eebb67078a91a522330.png