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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
- 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<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
效果图： 
