设置到意图活动后，bundle 为空

Question

我正在设置在活动之间遍历的意图。但是这里的包在设置意图后为空。这是我的代码，

NewCourseActivity.java
 AdapterView.OnItemSelectedListener mItemSelectedListener = new AdapterView.OnItemSelectedListener() {

        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
            CourseSelected=parent.getSelectedItem().toString();
            switch (view.getId()) {
                case R.id.BESPINNER:
                    String becourse=parent.getSelectedItem().toString();
                    Intent intent = new Intent(NewCourseActivity.this,BEViewCourseActivity.class);
                    Bundle data1 = new Bundle();
                    data1.putString("course",becourse);
                    intent.putExtras(data1);
                    startActivity(intent);
                    break; } }

BEViewCourseActivity.java:
 CourseSelected=findViewById(R.id.courseSelected);


        Intent intent = getIntent();
        Bundle data = intent.getExtras();
        if(data != null){
            String selectedcourse = data.getString("course");
            CourseSelected.setText(selectedcourse);
        }
        else{
            CourseSelected.setText("Failed");
        }

Answer 1

将数据从一个活动传递到另一个活动：

// updated becourse String
String becourse = parent.getItemAtPosition(position).toString();
Intent intent = new Intent(NewCourseActivity.this , BEViewCourseActivity.class);
intent.putExtra ( "course" , becourse  );
startActivity ( intent );

然后接收传递过来的数据：

Bundle extras = getIntent().getExtras();
if (extras != null) {
    String stringValue = extras.getString("course"); // string must be the same as the passed one
}