java - 错误: java. lang.RuntimeException，如何正确从 Intent 中获取额外内容？

Question

我正在尝试在两个布局之间设置 Intent :

searchListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
        long id = listOfDrugs.get(i).getId();
        Intent detailsDrugIntent = new Intent(MainActivity.this, DrugDetails.class);
        detailsDrugIntent.putExtra("id", id);
        startActivity(detailsDrugIntent);
    }
});

并以这种方式调用其附加功能:

id = Long.parseLong(this.getIntent().getStringExtra("id")); // THIS WHERE THE ERROR OCCURS

继续执行此操作会触发此错误消息:

FATAL EXCEPTION: main java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mypharmacy.app/com.mypharmacy.app.DrugDetails}: java.lang.NullPointerException: println needs a message

请问如何解决这个问题？

提前致谢!

Answer 1

试试这个:

id = this.getIntent().getExtras().getLong("id", 1L);