Android(安卓)实现答题器功能（通过手势实现翻页效果）

Android 实现答题器功能（通过手势实现翻页效果）

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

构建手势检测器
准备数据
为ViewFilpper添加子控件。
初始化Animation数组
把Activity的TouchEvent事件交个GestureDetector来处理
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 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 questions = initData();        mQuestion.addAll(questions);        //3.为ViewFilpper添加子控件。        for (int i = 0;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 initData(){       List 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.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.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.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.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
效果图：