Question

我是Android开发的新手，当我点击提交按钮时，我的结果将不会显示，而只显示空白的结果页面。我正在使用随机生成器，所以我希望每次按下提交按钮时结果都是随机的。我一直试图让它工作几个小时，所以任何帮助将不胜感激

这是我的代码：

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_system);
    final Random generator = new Random();
    correctResults = new String[] {"good job", "well done", "good"};

    RadioGroup gender = (RadioGroup) findViewById(R.id.answer1);
    gender.setOnCheckedChangeListener(new OnCheckedChangeListener() {
        public void onCheckedChanged(RadioGroup group, int checkedId) {
            // TODO Auto-generated method stub
            switch (checkedId) {
            case R.id.answer1A:
                ans1 = 1;
                break;
            case R.id.answer1B:
                ans1 = 2;
                break;
            }
        }
    });

    RadioGroup nutrition = (RadioGroup) findViewById(R.id.answer2);
    nutrition.setOnCheckedChangeListener(new OnCheckedChangeListener() {
        public void onCheckedChanged(RadioGroup group, int checkedId) {
            // TODO Auto-generated method stub
            switch (checkedId) {
            case R.id.answer2A:
                ans2 = 1;
                break;
            case R.id.answer2B:
                ans2 = 2;
                break;
            }
        }
    });

    btnSubmitQuiz = (Button) findViewById(R.id.submit);
    btnSubmitQuiz.setOnClickListener(new OnClickListener() {
        public void onClick(View v) {
            // 1
            if (ans1 == 1 && ans2 == 1) {
                displayResult();
                getRandomCorrectResult();
            } else {
                displayResult();
            }
        }

        private void displayResult() {
            Intent i = new Intent("com.example.system.SHOWRESULT");
            startActivity(i);
        }

        public String getRandomCorrectResult() {
            return correctResults[generator.nextInt(correctResults.length)];
        }
    });
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.system, menu);
    return true;
}

Answer 1

似乎您可以使用此link来了解如何开始其他活动。

Intent intent = new Intent(this/context, SHOWRESULT.class);
startActivity(intent);

如果您想将值传递给其他活动，则需要使用intent.putExtra();

Intent i = new Intent(this/context, SHOWRESULT.class);
i.putExtra("Value1", "This value one for ActivityTwo ");
i.putExtra("Value2", "This value two ActivityTwo");

并将这些值检索到SHOWRESULT activity，您可以使用捆绑包。

Bundle extras = getIntent().getExtras();
   if (extras == null) {
      //no data is passed
   }

   // get data via the key
   String value1 = extras.getString("Value1");
   if (value1 != null) {
     // do something with the data
   }

Answer 2

有很多问题。首先，您要向您要显示的任何活动发送空Intent ...假设您想要在单独的活动中显示结果，您需要在Intent上添加一些额外内容。

Intent i = new Intent(YourCurrentActivity.this, SHOWRESULT.class);
i.putExtra("NAME", "VALUE");
startActivity(i);

然后在你正在开始的Activity上收到额外内容......

Bundle extras = getIntent().getExtras();

if(extras != null)
   localVAriable = extras.getString("NAME");

您遇到的另一个问题是，在您启动其他Activity

后会处理结果

displayResult();
getRandomCorrectResult();

你应该从getRandomCorrectResult获得返回值并将它们作为额外内容放在意图中......

String results = getRandomCorrectResult();
Intent i = new Intent(YourCurrentActivity.this, SHOWRESULT.class);
i.putExtra("results", results);
startActivity(i);

单击“提交”按钮时不显示结果

2 个答案: