onActivityResult中的requestCode和resultCode指的是什么？

Question

大家好。我是 android 的新手，现在在我的程序中使用 startActivityForResult。在我的应用程序中，我有两个按钮和两个 textView。这两个 button 用于打开对话框。我如何检查在 ActivityResult 上按下了哪个按钮，以便 TextView 可以根据按钮设置文本？

  int a1 = 1;
  int a2 = 2;

   button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                AlertDialogRadio(a1);

            }
        });

        button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                AlertDialogRadio(a2);

            }
        });

 public void AlertDialogRadio(final int k) {  //parameter k is never used
            final CharSequence[] ClaimsModel = {"Project", "Petrol", "Car Maintenance"
                    , "Medical", "Other"};

            AlertDialog.Builder alt_bld = new AlertDialog.Builder(getActivity());
            alt_bld.setTitle("Select a Claims");
            alt_bld.setSingleChoiceItems(ClaimsModel, -1, new DialogInterface
                    .OnClickListener() {
                public void onClick(DialogInterface dialog, int item) {
                    if (item == 0) {
                        Intent intent = new Intent(getActivity().getApplicationContext(), Project1.class);
                        startActivityForResult(intent, 0);
                    } else if (item == 1) {
                        Intent intent = new Intent(getActivity().getApplicationContext(), Petrol.class);
                        startActivityForResult(intent, 1);
                    } else if (item == 2) {
                        Intent intent = new Intent(getActivity().getApplicationContext(), CarMainten.class);
                        startActivityForResult(intent, 2);
                    } else if (item == 3) {
                        Intent intent = new Intent(getActivity().getApplicationContext(), Medical.class);
                        startActivityForResult(intent, 3);
                    } else if (item == 4) {
                        Intent intent = new Intent(getActivity().getApplicationContext(), Other.class);
                        startActivityForResult(intent, 4);
                    }

                    dialog.dismiss();

                }
            });
            AlertDialog alert = alt_bld.create();
            alert.show();
        }


    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (resultCode == 1) { // if button1 was clicked
            switch (requestCode) {
                case 0:
                    String result = data.getStringExtra("text");
                    String b = data.getStringExtra("a");
                    c.setText("            " + b + "------" + "RM " + result);
                    Toast.makeText(getActivity(), "Not completed ", Toast.LENGTH_LONG).show();
                    break;

                case 1:
                    String result1 = data.getStringExtra("text");
                    String b1 = data.getStringExtra("a");
                    c.setText("            " + b1 + "------" + "RM " + result1);
                    break;


                case 2:
                    String result2 = data.getStringExtra("text");
                    String b2 = data.getStringExtra("a");
                    c.setText("            " + b2 + "------" + "RM " + result2);
                    break;

                case 3:
                    String result3 = data.getStringExtra("text");
                    String b3 = data.getStringExtra("a");
                    c.setText("            " + b3 + "------" + "RM " + result3);
                    break;

                case 4:
                    String result4 = data.getStringExtra("text");
                    String b4 = data.getStringExtra("a");
                    c.setText("            " + b4 + "------" + "RM " + result4);
                    break;
            }
        }
        else if (resultCode == 2) { // if button2 was clicked
            switch (requestCode) {
                case 0:
                    String result = data.getStringExtra("text");
                    String b = data.getStringExtra("a");
                    d.setText("            " + b + "------" + "RM " + result);
                    break;

                case 1:
                    String result1 = data.getStringExtra("text");
                    String b1 = data.getStringExtra("a");
                    d.setText("            " + b1 + "------" + "RM " + result1);
                    break;

                case 2:
                    String result2 = data.getStringExtra("text");
                    String b2 = data.getStringExtra("a");
                    d.setText("            " + b2 + "------" + "RM " + result2);
                    break;

                case 3:
                    String result3 = data.getStringExtra("text");
                    String b3 = data.getStringExtra("a");
                    d.setText("            " + b3 + "------" + "RM " + result3);
                    break;

                case 4:
                    String result4 = data.getStringExtra("text");
                    String b4 = data.getStringExtra("a");
                    d.setText("            " + b4 + "------" + "RM " + result4);
                    break;
            }
        }
    }

所以我的程序应该像这样工作：如果按钮 1 被点击....c.setText(); 如果按钮 2 被点击....d.setText();

但是程序现在在TextView上没有任何显示。错误是否来自 if (resultCode == 1) 和 else if (resultCode == 2)？非常感谢

假设使用selectProject1.class

Project1.class

public class Project1 extends AppCompatActivity {
    private static String text;
    private static String a;
    private static EditText txt;
    private int g;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.project);
       txt= (EditText)findViewById(R.id.editText36);
        Button b=(Button)findViewById(R.id.button17);

        b.setOnClickListener(new View.OnClickListener() {
            public void onClick(View arg0) {
                Intent returnIntent = new Intent();
                a="Project";
                text = txt.getText().toString();
                returnIntent.putExtra("text", text);
                returnIntent.putExtra("a",a);
              //  returnIntent.putExtra("k",getIntent().getExtras().getString("k"));
                setResult(Activity.RESULT_OK, returnIntent);
                finish();
            }
        });

    }
}

Answer 1

您应该避免在此处使用文字代码。

if (resultCode == 1)

使用命名常量更好 --

if (resultCode == RESULT_OK) {

RESULT_OK 是 -1，所以这可能是你的问题。

Answer 2

一旦我将所有请求代码设置为相同。没用。好像你的请求码和不一样，我习惯这样看：

private static final int REQUEST_CODE_THIS = 0;
private static final int REQUEST_CODE_THAT = 1;
private static final int REQUEST_CODE_THE_OTHER = 1003;

public void onClick(DialogInterface dialog, int item) {
                    if (item == 0) {
                        Intent intent = new     Intent(getActivity().getApplicationContext(), Project1.class);
                        startActivityForResult(intent, REQUEST_CODE_THIS);

检查像这样更改 onActivityResult() 是否有帮助。

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == REQUEST_CODE_THIS) { // if button1 was clicked
        switch (resultCode == RESULT_OK) {
            case 0:
                   ...
        }

Answer 3

request_code是调用函数标识，从哪里请求，result_code是被调用函数标识，也指定被调用消息的状态为Intent.ACTIVITY_OK等.

onActivityResult中的requestCode和resultCode指的是什么？

What does requestCode and resultCode in onActivityResult refer to?

java

android

radio-button

android-studio

onactivityresult