android - 从listview获取所选项目

Question

我正在尝试从列表视图中获取一个项目并将其传递给textview中的新活动，我最终会对其进行一些修改。

  

MainActivity.java

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

    if (savedInstanceState == null) {
        getFragmentManager().beginTransaction()
                .add(R.id.container, new PlaceholderFragment()).commit();
    }

    makeListView();
    getClick();
}
private void makeListView() {
    // TODO Auto-generated method stub

    ArrayAdapter<String> adapter = new ArrayAdapter<>(this, R.layout.items, input);
    ListView lista = (ListView) findViewById(R.id.listView1);
    lista.setAdapter(adapter);

}

private void getClick() {
    // TODO Auto-generated method stub
    ListView lista = (ListView) findViewById(R.id.listView1);
    lista.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> arg0, View viewClicked, int pos, long id) {
            // TODO Auto-generated method stub
            Intent intent = new Intent(MainActivity.this, SecondActivity.class);
            intent.putExtra("test", input[pos].toString());
            startActivity(intent);
        }
    });
}

  

SecondActivity.java

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.second_activity);

    Bundle extras = getIntent().getExtras();
    String myString = extras.getString("test");

    TextView text = (TextView) findViewById(R.id.textView1);
    text.setText(myString);

    if (savedInstanceState == null) {
        getFragmentManager().beginTransaction()
                .add(R.id.container, new PlaceholderFragment()).commit();

    }
}

我收到错误：

  

java.lang.RuntimeException：无法启动活动ComponentInfo {com.example.shoplist / com.example.shoplist.Second        * Activity}：java.lang.IllegalArgumentException：找不到片段PlaceholderFragment的id 0x7f080000的视图

我该怎么办？