Android通过手势实现答题器翻页效果

本文实例为大家分享了Android答题器翻页功能，主要使用ViewFilpper和GestureDetector来实现，供大家参考，具体内容如下

1.效果图

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;

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：Android实现答题器翻页效果

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