基于Android實現(xiàn)答題倒計時功能

更新時間：2018年01月18日 08:56:48 作者：H_Yi_

這篇文章主要介紹了基于Android實現(xiàn)答題倒計時功能，具有一定的參考價值，感興趣的小伙伴們可以參考一下

講一下我在做一個答題APP時涉及到倒計時時遇到的一個問題吧。
碎片（Fragment）+CountDownTimer組成的一個答題，其中遇到的一個問題就是，這個題的倒計時在你手動滑動下一個題的時候卻用在了下一個題的時間
解決這個問題運用的就是懶加載來控制倒計時的開始和取消

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);
    //倒計時
    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組設點擊事件
    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
   *      // 倒計時總數(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("倒計時: " + 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;
    }
    /**
     * 倒計時
     */
    countdowntimer.start();//開始倒計時
    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();//將倒計時取消

  }
/*
   //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
  }
*/

}

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