java Android Studio：通过多个活动传递多个值只显示一个？：(

Question

你好：）下面是我的“应用程序”的工作原理。有多个活动，每个活动中都有一个问题，可以用radiobuttons选择答案。它最终到达显示结果的最终活动

这是我第一个活动的代码

`public class Quiz extends Activity {
    Button btn;
    RadioGroup rg;


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

        btn = (Button) findViewById(R.id.nextBtn);
        rg = (RadioGroup) findViewById(R.id.rg);

        btn.setOnClickListener(new View.OnClickListener() {
            @Override

            public void onClick(View v) {
                if (rg.getCheckedRadioButtonId() == -1) {

                    Toast.makeText(getApplicationContext(), "Please select an answer",
                            Toast.LENGTH_SHORT).show();
                } else {
                    Intent intent = new Intent(getApplicationContext(), Quiz1.class);
                    Bundle bundle = new Bundle();
                    int id = rg.getCheckedRadioButtonId();
                    RadioButton radioButton = (RadioButton) findViewById(id);
                    bundle.putString("rg", radioButton.getText().toString());
                    intent.putExtras(bundle);
                    startActivity(intent);

                }

            }

        });
      }
    }

第二项活动：

public class Quiz1 extends Activity {

Button btn;
RadioGroup rg1;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.quiz1);

    btn = (Button) findViewById(R.id.nextBtn1);
    rg1= (RadioGroup) findViewById(R.id.rg1);

    btn.setOnClickListener(new View.OnClickListener() {
        @Override

        public void onClick(View v) {
            if (rg1.getCheckedRadioButtonId() == -1) {

                Toast.makeText(getApplicationContext(), "Please select an answer",
                        Toast.LENGTH_SHORT).show();
            } else{
                Intent intent = new Intent(getApplicationContext(), Quiz2.class);
                Bundle bundle = getIntent().getExtras();
                int id = rg1.getCheckedRadioButtonId();
                RadioButton radioButton = (RadioButton) findViewById(id);
                bundle.putString("rg1", radioButton.getText().toString());
                intent.putExtras(bundle);
                startActivity(intent);

            }

        }

    });
  }
}

第三：

public class Quiz2 extends Activity {

    Button btn;
    RadioGroup rg2;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.quiz2);


        btn = (Button) findViewById(R.id.nextBtn2);
        rg2= (RadioGroup) findViewById(R.id.rg2);

        btn.setOnClickListener(new View.OnClickListener() {
            @Override

            public void onClick(View v) {
                if (rg2.getCheckedRadioButtonId() == -1) {

                    Toast.makeText(getApplicationContext(), "Please select an answer",
                            Toast.LENGTH_SHORT).show();
                } else{
                    Intent intent = new Intent(getApplicationContext(), Quiz3.class);
                    Bundle bundle = getIntent().getExtras();
                    int id = rg2.getCheckedRadioButtonId();
                    RadioButton radioButton = (RadioButton) findViewById(id);
                    bundle.putString("rg2", radioButton.getText().toString());
                    intent.putExtras(bundle);
                    startActivity(intent);

                }

            }

        });
      }
    }

这一趋势持续了7项活动

以下是最终代码：

public class Final1 extends Activity {

Button btn;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.final1);

    Bundle bundle = getIntent().getExtras();

    TextView textView = (TextView)findViewById(R.id.txt);
    textView.setText(bundle.getCharSequence("rg"));

    TextView textView1 = (TextView)findViewById(R.id.txt1);
    textView.setText(bundle.getCharSequence("rg1"));

    TextView textView2 = (TextView)findViewById(R.id.txt2);
    textView.setText(bundle.getCharSequence("rg2"));

    TextView textView3 = (TextView)findViewById(R.id.txt3);
    textView.setText(bundle.getCharSequence("rg3"));

    TextView textView4 = (TextView)findViewById(R.id.txt4);
    textView.setText(bundle.getCharSequence("rg4"));

    TextView textView5 = (TextView)findViewById(R.id.txt5);
    textView.setText(bundle.getCharSequence("rg5"));

    TextView textView6 = (TextView)findViewById(R.id.txt6);
    textView.setText(bundle.getCharSequence("rg6"));

    btn = (Button)findViewById(R.id.restartBtn);

    btn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent in = new Intent(v.getContext(), Quiz.class);
            startActivityForResult(in, 0);
        }
    });

  }
}

这是我运行应用程序后在最后一页中看到的内容， 文本视图在最终结果页之前显示设置为所选选项的文本。。。 其余的文本视图（所以文本视图1、2、3、4、5、6）都是空的

感谢您的帮助<；三,

Answer 1

改为使用共享引用

在课堂下制作并在需要时使用

    public class PreferenceManager {
    private static final String PREFERENCES_QUIZ_ANS = "quiz_ans";
    private static final String QUIZ_ANS_1 = "quiz_ans_1";

    private static SharedPreferences getQuizAnsPreferences(Context context) {
        return context.getSharedPreferences(PREFERENCES_QUIZ_ANS, Activity.MODE_PRIVATE);
    }

    public static void storeQuizAns_1(Context context, String quiz_ans_1){
        getServicePreferences(context).edit().putString(QUIZ_ANS_1, quiz_ans_1).commit();
    }

    public static String getQuizAns_1(Context context){
        return getServicePreferences(context).getString(QUIZ_ANS_1, null);
    }
}

在每个活动中都像下面一样使用它来存储答案

PreferenceManager.storeQuizAns_1(getApplicationContext(), radioButton.getText().toString());

在最后的活动中，如下图所示使用它获取答案并打印到文本视图中

TextView textView1 = (TextView)findViewById(R.id.txt1); textView1.setText(PreferenceManager.getQuizAns_1(this));

您必须尽可能多地使用storeQuizAns_1和getQuizAns_1等方法。 你必须尽可能多地制造像测验1这样的常量

Answer 2

对于您的情况，保存和检索数据的最佳方法是使用Sharedpreferences.

在所有活动中，将SharedReferences初始化为

SharedPreferences prefs = this.getSharedPreferences("myprefs", Context.MODE_PRIVATE);

而不是保存在bundle中，而是另存为

prefs.edit.putString("rg2", radioButton.getText().toString()).apply();

然后，在最后的活动中，检索为

prefs.getString("rg2","");

如果您想使用意图进行此操作，则必须将旧数据传递给每个活动中的新活动。 所以，在你的第二节课上

intent.putExtras("rg",bundle.getString("rg")); );
intent.putExtras("rg1", radioButton.getText().toString());

等等