从Mainactivity发送一个值并在另一个活动中显示该值

Question

我正在尝试制作一个简单的测验应用程序，并且我想在另一个活动（另一个屏幕）中显示分数值，即当我按下提交按钮时，分数活动应该打开并显示总分。

我尝试过使用意图，但它没有奏效。我是android编程新手，可能会出现一些愚蠢的错误。

这是MainActivity.java文件。

package com.example.android.conanquiz; 

import android.content.Intent; 
import android.os.Bundle; 
import android.support.v7.app.AppCompatActivity; 
import android.view.View; 
import android.widget.RadioButton; 
import android.widget.TextView; 

public class MainActivity extends AppCompatActivity { 
    int score = 0; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
    } 

    //Question 1 Methods 
    public void question1_click(View view) { 
     boolean checked = ((RadioButton) view).isChecked(); 

     // Check which radio button was clicked 
     switch (view.getId()) { 
      case R.id.haibara: 
       if (checked) { 
        String correct = "Right Answer"; 
        display_answer1(correct); 
        score++; 
       } 
       break; 
      default: { 
       String wrong = "Wrong Answer" + "\n" + "The right answer is " + getString(R.string.q1_o1); 
       display_answer1(wrong); 
      } 
      break; 
     } 

    } 

    private void display_answer1(String answer) { 
     TextView quantityTextView = (TextView) findViewById(R.id.answer_1); 
     quantityTextView.setText(answer); 
    } 

    //Question 2 Methods 
    public void question2_click(View view) { 
     boolean checked = ((RadioButton) view).isChecked(); 

     // Check which radio button was clicked 
     switch (view.getId()) { 
      case R.id.true_op: 
       if (checked) { 
        String correct = "Right Answer"; 
        display_answer2(correct); 
        score++; 
       } 
       break; 
      default: { 
       String wrong = "Wrong Answer" + "\n" + "The right answer is " + getString(R.string.q2_o1); 
       display_answer2(wrong); 
      } 
      break; 
     } 

    } 

    private void display_answer2(String answer) { 
     TextView quantityTextView = (TextView) findViewById(R.id.answer_2); 
     quantityTextView.setText(answer); 
    } 


    //Question 3 Methods 
    public void question3_click(View view) { 
     boolean checked = ((RadioButton) view).isChecked(); 

     // Check which radio button was clicked 
     switch (view.getId()) { 
      case R.id.q3_op3: 
       if (checked) { 
        String correct = "Right Answer"; 
        display_answer3(correct); 
        score++; 
       } 
       break; 
      default: { 
       String wrong = "Wrong Answer" + "\n" + "The right answer is " + getString(R.string.q3_o3); 
       display_answer3(wrong); 
      } 
      break; 
     } 

    } 

    private void display_answer3(String answer) { 
     TextView quantityTextView = (TextView) findViewById(R.id.answer_3); 
     quantityTextView.setText(answer); 
    } 


    //Question 4 Methods 
    public void question4_click(View view) { 
     boolean checked = ((RadioButton) view).isChecked(); 

     // Check which radio button was clicked 
     switch (view.getId()) { 
      case R.id.q4_op1: 
       if (checked) { 
        String correct = "Right Answer"; 
        display_answer4(correct); 
        score++; 
       } 
       break; 
      default: { 
       String wrong = "Wrong Answer" + "\n" + "The right answer is " + getString(R.string.q4_o1); 
       display_answer4(wrong); 
      } 
      break; 
     } 

    } 

    private void display_answer4(String answer) { 
     TextView quantityTextView = (TextView) findViewById(R.id.answer_4); 
     quantityTextView.setText(answer); 
    } 

    //Question 5 Methods 

    public void question5_click(View view) { 
     boolean checked = ((RadioButton) view).isChecked(); 

     // Check which radio button was clicked 
     switch (view.getId()) { 
      case R.id.q5_op3: 
       if (checked) { 
        String correct = "Right Answer"; 
        display_answer5(correct); 
        score++; 
       } 
       break; 
      default: { 
       String wrong = "Wrong Answer" + "\n" + "The right answer is " + getString(R.string.q5_o3); 
       display_answer5(wrong); 
      } 
      break; 
     } 

    } 

    private void display_answer5(String answer) { 
     TextView quantityTextView = (TextView) findViewById(R.id.answer_5); 
     quantityTextView.setText(answer); 
    } 



    //Submit Button 
    public void onClickSubmit(View view){ 
     Intent scoreActivity = new Intent(MainActivity.this,Score.class); 
     scoreActivity.putExtra("sendScore", score); 
     startActivity(scoreActivity); 


    } 



} 

这是其他活动的Java（Score.java）文件

package com.example.android.conanquiz; 

import android.content.Intent; 
import android.os.Bundle; 
import android.support.v7.app.AppCompatActivity; 
import android.widget.TextView; 

public class Score extends AppCompatActivity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_score); 

     Intent scoreActivity = getIntent(); 
     int totalScore = scoreActivity.getIntExtra("sendScore", 0); 
     displayScore(totalScore); 

    } 


    public void displayScore(int score) { 
     TextView scoreTextView = (TextView) findViewById(R.id.score); 
     scoreTextView.setText(score); 
    } 

} 

Answer 1

尝试使用登录按钮，点击打印score。如果得分不为空，则写下面的代码。

从活动

Intent intent = new Intent(getBaseContext(), Score.class); 
intent.putExtra("EXTRA_SCORE", score); 
startActivity(intent); 

到活动

Intent intent = getIntent(); 
int intValue = intent.getIntExtra("EXTRA_SCORE", 0);