如何传递对象ArrayList中从一个在Android的使用意图的另一项活动？意图、对象、ArrayList、Android

2023-09-12 06:42:31 作者：抚媚不是妖

我有我的的onClick（）方法按照code为

 名单，其中;问题＆GT; mQuestionsList = QuestionBank.getQuestions（）;

现在我有这行的意图后，如下：

 意图resultIntent =新的意图（这一点，ResultActivity.class）;
  resultIntent.putParcelableArrayListExtra（QuestionsExtra，（ArrayList中和LT ;?延伸Parcelable＆GT;）mQuestionsList）;
  startActivity（resultIntent）;

我不知道如何从一个活动传递了这个问题列出了意向另一个活动我的问题类

 公共类问题{
    私人INT []操作数;
    私人INT []选择;
    私人诠释userAnswerIndex;

    公众质疑（INT []操作数，INT []选择）{
        this.operands =操作数;
        this.choices =选择;
        this.userAnswerIndex = -1;
    }

    公众诠释[] getChoices（）{
        返回的选择;
    }

    公共无效setChoices（INT []选择）{
        this.choices =选择;
    }

    公众诠释[] getOperands（）{
        返回操作数;
    }

    公共无效setOperands（INT []操作数）{
        this.operands =操作数;
    }

    公众诠释getUserAnswerIndex（）{
        返回userAnswerIndex;
    }

    公共无效setUserAnswerIndex（INT userAnswerIndex）{
        this.userAnswerIndex = userAnswerIndex;
    }

    公众诠释的getAnswer（）{
        INT答案= 0;
        对于（INT操作数：操作数）{
            答案+ =操作;
        }
        返回的答案;
    }

    公共布尔isCorrect（）{
        返回的getAnswer（）==选择[this.userAnswerIndex];
    }

    公共布尔hasAnswered（）{
        返回userAnswerIndex！= -1;
    }

    @覆盖
    公共字符串的toString（）{
        StringBuilder的建设者=新的StringBuilder（）;

        // 题
        builder.append（问：）;
        对于（INT操作数：操作数）{
            builder.append（的String.Format（％D操作数））;
        }
        builder.append（System.getProperty（line.separator））;

        //选择
        INT答案=的getAnswer（）;
        对于（INT选择：选择）{
            如果（选择==回答）{
                builder.append（的String.Format（％D（A），选择））;
            } 其他 {
                builder.append（的String.Format（％D，选择））;
            }
        }
        返回builder.toString（）;
       }

      }

解决方案

它运作良好，

 公共类问题实现Serializable {
    私人INT []操作数;
    私人INT []选择;
    私人诠释userAnswerIndex;

   公众质疑（INT []操作数，INT []选择）{
       this.operands =操作数;
       this.choices =选择;
       this.userAnswerIndex = -1;
   }

   公众诠释[] getChoices（）{
       返回的选择;
   }

   公共无效setChoices（INT []选择）{
       this.choices =选择;
   }

   公众诠释[] getOperands（）{
       返回操作数;
   }

   公共无效setOperands（INT []操作数）{
       this.operands =操作数;
   }

   公众诠释getUserAnswerIndex（）{
       返回userAnswerIndex;
   }

   公共无效setUserAnswerIndex（INT userAnswerIndex）{
       this.userAnswerIndex = userAnswerIndex;
   }

   公众诠释的getAnswer（）{
       INT答案= 0;
       对于（INT操作数：操作数）{
           答案+ =操作;
       }
       返回的答案;
   }

   公共布尔isCorrect（）{
       返回的getAnswer（）==选择[this.userAnswerIndex];
   }

   公共布尔hasAnswered（）{
       返回userAnswerIndex！= -1;
   }

   @覆盖
   公共字符串的toString（）{
       StringBuilder的建设者=新的StringBuilder（）;

       // 题
       builder.append（问：）;
       对于（INT操作数：操作数）{
           builder.append（的String.Format（％D操作数））;
       }
       builder.append（System.getProperty（line.separator））;

       //选择
       INT答案=的getAnswer（）;
       对于（INT选择：选择）{
           如果（选择==回答）{
               builder.append（的String.Format（％D（A），选择））;
           } 其他 {
               builder.append（的String.Format（％D，选择））;
           }
       }
       返回builder.toString（）;
     }
  }

在源活动，用这个：

 名单，其中;问题＆GT; mQuestionList =新的ArrayList＆LT;问题取代;
  mQuestionsList = QuestionBank.getQuestions（）;
  mQuestionList.add（新课题（OPS1，choices1））;

  意向意图=新的意图（SourceActivity.this，TargetActivity.class）;
  intent.putExtra（QuestionListExtra，ArrayList的＆LT;问题＆GT; mQuestionList）;

在你的目标的活动，用这个：

 名单，其中;问题＆GT;问题=新的ArrayList＆LT;问题＆GT;（）;
  问题=（ArrayList的＆LT;问题＆GT;）getIntent（）getSerializableExtra（QuestionListExtra）。

I have the following in code in my onClick() method as

 List<Question> mQuestionsList = QuestionBank.getQuestions();

Now I have the intent after this line, as follows :

  Intent resultIntent = new Intent(this, ResultActivity.class);
  resultIntent.putParcelableArrayListExtra("QuestionsExtra", (ArrayList<? extends Parcelable>) mQuestionsList);
  startActivity(resultIntent);

I don't know how to pass this question lists in the intent from one activity to another activity My Question class

public class Question {
    private int[] operands;
    private int[] choices;
    private int userAnswerIndex;

    public Question(int[] operands, int[] choices) {
        this.operands = operands;
        this.choices = choices;
        this.userAnswerIndex = -1;
    }

    public int[] getChoices() {
        return choices;
    }

    public void setChoices(int[] choices) {
        this.choices = choices;
    }

    public int[] getOperands() {
        return operands;
    }

    public void setOperands(int[] operands) {
        this.operands = operands;
    }

    public int getUserAnswerIndex() {
        return userAnswerIndex;
    }

    public void setUserAnswerIndex(int userAnswerIndex) {
        this.userAnswerIndex = userAnswerIndex;
    }

    public int getAnswer() {
        int answer = 0;
        for (int operand : operands) {
            answer += operand;
        }
        return answer;
    }

    public boolean isCorrect() {
        return getAnswer() == choices[this.userAnswerIndex];
    }

    public boolean hasAnswered() {
        return userAnswerIndex != -1;
    }

    @Override
    public String toString() {
        StringBuilder builder = new StringBuilder();

        // Question
        builder.append("Question: ");
        for(int operand : operands) {
            builder.append(String.format("%d ", operand));
        }
        builder.append(System.getProperty("line.separator"));

        // Choices
        int answer = getAnswer();
        for (int choice : choices) {
            if (choice == answer) {
                builder.append(String.format("%d (A) ", choice));
            } else {
                builder.append(String.format("%d ", choice));
            }
        }
        return builder.toString();
       }

      }

解决方案

It works well,

public class Question implements Serializable {
    private int[] operands;
    private int[] choices;
    private int userAnswerIndex;

   public Question(int[] operands, int[] choices) {
       this.operands = operands;
       this.choices = choices;
       this.userAnswerIndex = -1;
   }

   public int[] getChoices() {
       return choices;
   }

   public void setChoices(int[] choices) {
       this.choices = choices;
   }

   public int[] getOperands() {
       return operands;
   }

   public void setOperands(int[] operands) {
       this.operands = operands;
   }

   public int getUserAnswerIndex() {
       return userAnswerIndex;
   }

   public void setUserAnswerIndex(int userAnswerIndex) {
       this.userAnswerIndex = userAnswerIndex;
   }

   public int getAnswer() {
       int answer = 0;
       for (int operand : operands) {
           answer += operand;
       }
       return answer;
   }

   public boolean isCorrect() {
       return getAnswer() == choices[this.userAnswerIndex];
   }

   public boolean hasAnswered() {
       return userAnswerIndex != -1;
   }

   @Override
   public String toString() {
       StringBuilder builder = new StringBuilder();

       // Question
       builder.append("Question: ");
       for(int operand : operands) {
           builder.append(String.format("%d ", operand));
       }
       builder.append(System.getProperty("line.separator"));

       // Choices
       int answer = getAnswer();
       for (int choice : choices) {
           if (choice == answer) {
               builder.append(String.format("%d (A) ", choice));
           } else {
               builder.append(String.format("%d ", choice));
           }
       }
       return builder.toString();
     }
  }

In your Source Activity, use this :

  List<Question> mQuestionList = new ArrayList<Question>;
  mQuestionsList = QuestionBank.getQuestions();
  mQuestionList.add(new Question(ops1, choices1));

  Intent intent = new Intent(SourceActivity.this, TargetActivity.class);
  intent.putExtra("QuestionListExtra", ArrayList<Question>mQuestionList);

In your Target Activity, use this :

  List<Question> questions = new ArrayList<Question>();
  questions = (ArrayList<Question>)getIntent().getSerializableExtra("QuestionListExtra");

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