Question

为什么这个值没有出现在咨询医生血症的第二个活动中？我认为代码已经正确了。但它显示为null。

resultAnaemia

if(symptom16.equals("Yes"))
{                                 
   weight=0.11;                                                  
   newWeight = 0.0 * 0.15; //cf disease = 0.6, [min=0.15]                               
   String cf = Double.toString(newWeight);


   Intent intent = new Intent(resultAnemia.this, consultDoctorAnaemia.class);

   intent.putExtra("cfDiseases", cf);

   startActivity(intent);

}

consultDoctorAnaemia

    TextView textView = (TextView) findViewById(R.id.textCF);

    //get passed intent
    Intent intent = getIntent();

    if(null != intent)
    {
        //get cf value from intent
        String cf = intent.getStringExtra("cfDiseases");
        textView.setText("Certainty value : " + cf);
    }

Answer 1

Bundle extras = getIntent().getExtras();
        if (extras != null) {
            String Diseases = extras.getString("cfDiseases");
        }

Answer 2

您需要参加consultDoctorAnaemia活动：

Bundle bundle = getIntent().getExtras();

String value2 = bundle.getString("cfDiseases");

Answer 3

在第一项活动中尝试此操作：

// do your intent setup somewhere and then setup bundle
Bundle info = new Bundle();
info.putString("cfDiseases", cf);
intent.putExtras(info);
startActivity(intent);

在新活动中： Bundle info = new Bundle（）; info = getIntent（）。getExtras（）; cf = info.getString（＆＃34; cfDiseases＆＃34;）;

Answer 4

你也可以像这样传递价值

声明你的字符串全局和静态例如

在此类中声明变量

A类

public class A extends Activity{

static String cf = "abcde";


}

此B类中的访问变量

B类

public class B extends Activity{
String Temp;

//you can get variable like this
Temp=A.cf ;
Toast.makeText(B.this, "Temp = "+Temp, Toast.LENGTH_SHORT).show();

}

将意图值传递给另一个活动

4 个答案: