java - ArrayList<string> getIntent 导致应用程序崩溃

Question

我正在使用 Android studio 2.3.2，但我无法弄清楚出了什么问题。如果我评论:

 ar = getIntent().getExtras().getStringArrayList("name");

一切正常，但显然它不起作用。

我的文件是:

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        ArrayList<String> ar = new ArrayList<String>();
        ar = getIntent().getExtras().getStringArrayList("name");
    }

    public void clickFunction(View view){

        Intent intent = new Intent(getApplicationContext(),secondactivity.class);

        startActivity(intent);

    }
}

public class secondactivity extends AppCompatActivity {

    public void clickFunction(View view){


        ArrayList<String> ar=new ArrayList<String>();
        ar.add("Apple");
        ar.add("Banana");
        Intent intent = new Intent(getApplicationContext(),MainActivity.class);
        intent.putExtra("name",ar);
        startActivity(intent);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_secondactivity);

        // Intent intent = getIntent();

    }
}`

    `

Answer 1

尝试使用

getIntent().getStringArrayListExtra("name")