StringBuilder 和 ArrayAdapter 出错

Question

我在尝试将 StringBuilder 传递到 ArrayAdapter 以使其显示在 ListView 中时遇到问题。我在编译时收到 cannot resolve constructor error，我确定它与 StringBuilder 有关。 Java 不是我的母语，所以非常感谢任何解释和答案。

这是我的代码

public class MainActivity extends Activity {

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

        ActivityManager activityManager = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
        List<ActivityManager.RunningAppProcessInfo> list = activityManager.getRunningAppProcesses();


        StringBuilder info = new StringBuilder();
        for (int i = 0; i < list.size(); i++) {
            info.append(list.get(i).processName + "\n");
        }
        ArrayAdapter<StringBuilder> adapter = new ArrayAdapter<StringBuilder>(this,android.R.layout.simple_list_item_1, info);
        ListView listView = (ListView) findViewById(R.id.listView1);
        listView.setAdapter(adapter);

   }

   @Override
   public boolean onCreateOptionsMenu(Menu menu) {
       // Inflate the menu; this adds items to the action bar if it is present.
       getMenuInflater().inflate(R.menu.menu_main, menu);

       return true;
   }
}

Answer 1

没有 ArrayAdapter 的构造函数以 StringBuilder 作为参数。使用 ArrayList

ArrayList<String> info = new ArrayList<>();
for (ActivityManager.RunningAppProcessInfo p : list) {
   info.add(p.processName);
}

应该做。

编辑：

你也应该使用

ArrayAdapter<String> 而不是 ArrayAdapter<StringBuilder>

StringBuilder 和 ArrayAdapter 出错

Error with StringBuilder and ArrayAdapter

java

stringbuilder

android

android-arrayadapter

android-listview