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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

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;@Overrideprotected 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);}@Overrideprotected 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() {@Overridepublic 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;}@Overridepublic boolean onDown(MotionEvent e) {return false;}@Overridepublic void onShowPress(MotionEvent e) {}@Overridepublic boolean onSingleTapUp(MotionEvent e) {return false;}@Overridepublic boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {return false;}@Overridepublic void onLongPress(MotionEvent e) {}//重点实现在这里切换@Overridepublic 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;}@Overridepublic 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
效果图：