java - 如何通过 Intent 传递对象列表

Question

我正在尝试将对象列表从一个 Activity 传递到另一个 Activity 。但是无法发送。

这是我的代码。

 setPrefBtn.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                Intent homePageIntent = new Intent(SetPreferences.this,
                        KlarityHome.class);// Connecting setPreferences page
                // with Klarity Home Page

               List<PracticeVO> tempList = new ArrayList<PracticeVO>();
               tempList.add(practiceObj);
                     homePageIntent.putExtra("SelectedPractice",       tempList.toArray());
                startActivity(homePageIntent);
            }
            });

然后像这样在第二个 Activity 中恢复: Intent prefIntent = new Intent(); 列表 preferencedPractices = (List) getIntent().getExtras().get("SelectedPractice");

            ArrayAdapter<PracticeVO> praticeAdapter = new ArrayAdapter<PracticeVO>(this, android.R.layout.simple_spinner_item,
                    preferencedPractices);

              praticeAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
            practiceSpin.setAdapter(praticeAdapter);

Answer 1

您需要使用 putExtra() 函数将值传递给另一个 Activity

Intent newIntent = new Intent(MainActivity.this, ResultActivity.class);
newIntent.putExtra("yourTxtField",yourTxtField.getText());

要接收您需要使用其他 getIntent 和 Bundle。

Intent myIntent = getIntent();
Bundle valores  = myIntent.getExtras();

//Objeto que vai calcular os resultados
Resultado resultado = new Resultado();

//Recupera os valores recebidos pelo intent
double seuDinheiro  =  Double.parseDouble((String) valores.get("seuDinheiro").toString());

要传递对象，请参阅此 SO 帖子

How do I pass an object from one activity to another on Android?

How to pass an object from one activity to another on Android