基于Android實(shí)現(xiàn)答題倒計(jì)時(shí)功能
這篇文章主要介紹了基于Android實(shí)現(xiàn)答題倒計(jì)時(shí)功能，具有一定借鑒價(jià)值，感興趣的朋友可以參考下，希望大家閱讀完這篇文章之后大有收獲，下面讓小編帶著大家一起了解一下。
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講一下我在做一個答題APP時(shí)涉及到倒計(jì)時(shí)時(shí)遇到的一個問題吧。
碎片（Fragment）+CountDownTimer組成的一個答題，其中遇到的一個問題就是，這個題的倒計(jì)時(shí)在你手動滑動下一個題的時(shí)候卻用在了下一個題的時(shí)間
解決這個問題運(yùn)用的就是懶加載來控制倒計(jì)時(shí)的開始和取消
首先你要先定義一個抽象類繼承Fragment 再讓你的答題那個碎片的Activity繼承
package com.zking.sun.dao;
import android.support.v4.app.Fragment;
import android.util.Log;
/**
* Created by sun on 2017/1/11.
*/
public abstract class LazyFragment extends Fragment {
protected boolean isVisible;
/**
* 在這里實(shí)現(xiàn)Fragment數(shù)據(jù)的緩加載.
* @param isVisibleToUser
*/
@Override
public void setUserVisibleHint(boolean isVisibleToUser) {
super.setUserVisibleHint(isVisibleToUser);
if(getUserVisibleHint()) {
//可見時(shí)調(diào)用
isVisible = true;
onVisible();
} else {
isVisible = false;
onInvisible();
}
}
protected abstract void onVisible();
//protected abstract void lazyLoad();
protected abstract void onInvisible();
}這是答題的Activity 在這里你要繼承剛剛自己寫的抽象類
這個類里面包含了數(shù)據(jù)的加載什么的，有需要的童鞋可以看看，就不刪了哈。
package com.zking.sun.android_06_project;
import android.content.Intent;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.os.Handler;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.view.ViewPager;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import com.zking.sun.dao.LazyFragment;
import com.zking.sun.dao.QusetionDao;
import com.zking.sun.entity.QuestionEntity;
import java.util.List;
import static com.zking.sun.android_06_project.R.id.tv_splash_01;
/**
* Created by sun on 2016/12/21.
*/
public class FragmentActivity extends LazyFragment {
private ViewPager viewpager_main_01;
private TextView question_fragment_tv;
private RadioButton answer_fragment_01,answer_fragment_02,answer_fragment_03,answer_fragment_04;
private QusetionDao qusetionDao=new QusetionDao();
private int i;
private RadioGroup rg_fragment_qu;
private String right_answer;
private TextView count_fragment_down;
private int SPLASH_DISPLAY_LENGHT = 10000; //延遲多少秒
private TextView tv_splash_01;
private Handler handler = new Handler();
private Runnable runnbale ;
private Intent intent;
private MyCountdownTimer countdowntimer;
private TextView questionR_fragment_tv;
private boolean isPrepared;
public FragmentActivity(){
}
public FragmentActivity(int i){
this.i=i;
}
public int getI() {
return i;
}
public void setI(int i) {
this.i = i;
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View v=inflater.inflate(R.layout.fragment_1,null);
//找到問題和答案的控件
question_fragment_tv = (TextView) v.findViewById(R.id.question_fragment_tv);
questionR_fragment_tv = (TextView) v.findViewById(R.id.questionR_fragment_tv);
questionR_fragment_tv.setVisibility(View.INVISIBLE);
answer_fragment_01 = (RadioButton) v.findViewById(R.id.answer_fragment_01);
answer_fragment_02 = (RadioButton) v.findViewById(R.id.answer_fragment_02);
answer_fragment_03 = (RadioButton) v.findViewById(R.id.answer_fragment_03);
answer_fragment_04 = (RadioButton) v.findViewById(R.id.answer_fragment_04);
rg_fragment_qu = (RadioGroup) v.findViewById(R.id.rg_fragment_qu);
count_fragment_down = (TextView) v.findViewById(R.id.count_fragment_down);
//倒計(jì)時(shí)
countdowntimer = new MyCountdownTimer(10000, 1000);
//綁定值 獲取頁面的監(jiān)聽的i 傳過來改變
isPrepared = true;
//懶加載
getvalue(this.i);
onVisible();//可見
onInvisible();//不可見
// lazyLoad();
return v;
}
public void getvalue(int i){
//查詢數(shù)據(jù)
/**
* @param context 上下文
* @param name 名字（數(shù)據(jù)庫名），文件名
* @param factory 游標(biāo)工廠，多數(shù)情況：null
* @param version 數(shù)據(jù)庫版本
*/
//DBHepler dbHepler=new DBHepler(this,"questions.db",null,1);
List<QuestionEntity> questionEntityList=qusetionDao.findAll(getContext());
right_answer = questionEntityList.get(i).getRight_answer();
questionR_fragment_tv.setText("答案："+right_answer);
/* if (right_answer.equalsIgnoreCase("A")){
right_answer = "answer_fragment_01";
}*/
//將查詢出來的數(shù)據(jù)放到控件里面
question_fragment_tv.setText(questionEntityList.get(i).getQusetion());
answer_fragment_01.setText(questionEntityList.get(i).getAnswera());
answer_fragment_02.setText(questionEntityList.get(i).getAnswerb());
answer_fragment_03.setText(questionEntityList.get(i).getAnswerc());
String this04=questionEntityList.get(i).getAnswerd()+"";
Log.i("answer_fragment_04","_____________"+this04+"_____________");
if(this04.equals("")||this04.equals("null")){
answer_fragment_04.setVisibility(View.INVISIBLE);
}
else{
answer_fragment_04.setText(questionEntityList.get(i).getAnswerd());
answer_fragment_04.setVisibility(View.VISIBLE);
}
//get組設(shè)點(diǎn)擊事件
rg_fragment_qu.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
rg_fragment_qu.setEnabled(false);
int selectRadio = group.getCheckedRadioButtonId();
switch (selectRadio){
case R.id.answer_fragment_01:
// countdowntimer.cancel();
if (right_answer.equalsIgnoreCase("A")){
answer_fragment_01.setBackgroundResource(R.drawable.examtxt_btn_right);
}
else{
answer_fragment_01.setBackgroundResource(R.drawable.examtxt_btn_wrong);
questionR_fragment_tv.setVisibility(View.VISIBLE);
}
answer_fragment_02.setEnabled(false);
answer_fragment_03.setEnabled(false);
answer_fragment_04.setEnabled(false);
break;
case R.id.answer_fragment_02:
//countdowntimer.cancel();
if (right_answer.equalsIgnoreCase("B")){
answer_fragment_02.setBackgroundResource(R.drawable.examtxt_btn_right);
}
else{
answer_fragment_02.setBackgroundResource(R.drawable.examtxt_btn_wrong);
questionR_fragment_tv.setVisibility(View.VISIBLE);
}
answer_fragment_01.setEnabled(false);
answer_fragment_03.setEnabled(false);
answer_fragment_04.setEnabled(false);
break;
case R.id.answer_fragment_03:
//countdowntimer.cancel();
if (right_answer.equalsIgnoreCase("C")){
answer_fragment_03.setBackgroundResource(R.drawable.examtxt_btn_right);
}
else{
answer_fragment_03.setBackgroundResource(R.drawable.examtxt_btn_wrong);
questionR_fragment_tv.setVisibility(View.VISIBLE);
}
answer_fragment_02.setEnabled(false);
answer_fragment_01.setEnabled(false);
answer_fragment_04.setEnabled(false);
break;
case R.id.answer_fragment_04:
//countdowntimer.cancel();
if (right_answer.equalsIgnoreCase("D")){
answer_fragment_04.setBackgroundResource(R.drawable.examtxt_btn_right);
}
else{
answer_fragment_04.setBackgroundResource(R.drawable.examtxt_btn_wrong);
questionR_fragment_tv.setVisibility(View.VISIBLE);
}
answer_fragment_02.setEnabled(false);
answer_fragment_03.setEnabled(false);
answer_fragment_01.setEnabled(false);
break;
}
}
});
}
/**
* Rewrite 'CountDownTimer' method.
*
* @param
* // 倒計(jì)時(shí)總數(shù)，單位為毫秒。
* @param
* // 每隔多久調(diào)用onTick一次
* @author DaiZhenWei
*
*/
protected class MyCountdownTimer extends CountDownTimer {
public MyCountdownTimer(long millisInFuture, long countDownInterval) {
super(millisInFuture, countDownInterval);
}
@Override
public void onTick(long millisUntilFinished) {
count_fragment_down.setText("倒計(jì)時(shí): " + millisUntilFinished / 1000);
}
@Override
public void onFinish() {
//count_fragment_down.setText("Turning");
FightActivity.getNext(null);
}
}
//fragment的懶加載 重寫
@Override
protected void onVisible() {
//可見的
if(!isPrepared || !isVisible) {
//判斷isPrepared和isVisible只要有一個不為true就不往下執(zhí)行
Log.i("isPrepared",isPrepared+"____________"+isVisible);
return;
}
/**
* 倒計(jì)時(shí)
*/
countdowntimer.start();//開始倒計(jì)時(shí)
Log.i("isPrepared",this.i+"_______4");
}
@Override
protected void onInvisible() {
//不可見的
if(!isPrepared || isVisible) {
return;
}
Log.i("isPrepared","____________我取消了"+this.i);
countdowntimer.cancel();//將倒計(jì)時(shí)取消
}
/*
//主頁面
public void loadUI(Class c){
//啟動之后跳著頁面
// Intent intent=new Intent(SplashActivity.this,MainActivity.class);
Intent intent=new Intent(FragmentActivity.this.getContext(),c);
// SplashActivity.this.startActivity(intent);
// SplashActivity.this.finish();//Toast.LENGTH_LONG
}
*/
}感謝你能夠認(rèn)真閱讀完這篇文章，希望小編分享的“基于Android實(shí)現(xiàn)答題倒計(jì)時(shí)功能”這篇文章對大家有幫助，同時(shí)也希望大家多多支持創(chuàng)新互聯(lián)，關(guān)注創(chuàng)新互聯(lián)行業(yè)資訊頻道，更多相關(guān)知識等著你來學(xué)習(xí)!
本文題目：基于Android實(shí)現(xiàn)答題倒計(jì)時(shí)功能
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