Android ListActivity基于对象状态的行颜色

Android ListActivity基于对象状态的行颜色

我在commonsware.com的“ Android开发的繁忙编码员指南”的免费摘录中找到了有关如何执行此操作的出色教程。还可以在youtube
上查看Google I / O
2010-ListView的世界
，其中包含许多有用的信息。

基本上，我要做的只是创建一个自定义ArrayAdapter并覆盖getView（）。查看下面的代码。

public class Lwm extends ListActivity {  private TextView mSelection;  private List<MonitorObject> mMonitorObjects;  @Override  public void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    mMonitorObjects = getMonitorObjects();    setContentView(R.layout.main);    setListAdapter(new CustomAdapter());    mSelection = (TextView)findViewById(R.id.selection);  }  @Override  public void onListItemClick(ListView parent, View v, int position, long id){    mSelection.setText("Selection length is: " + mMonitorObjects.get(position).toString().length());  }  private class CustomAdapter extends ArrayAdapter<MonitorObject> {    CustomAdapter() {      super(Lwm.this, R.layout.row, R.id.label, mMonitorObjects);    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {View row = convertView;      if (row == null) {        // This gives us a View object back which, in reality, is our LinearLayout with         // an ImageView and a TextView, just as R.layout.row specifies.        LayoutInflater inflater = getLayoutInflater();   row = inflater.inflate(R.layout.row, parent, false);      }      TextView label = (TextView) row.findViewById(R.id.label);      label.setText(mMonitorObjects.get(position).toString());      ImageView icon = (ImageView)row.findViewById(R.id.icon);      MonitorObject mo = getMonitorObjects().get(position);      if (mo.ismAlarm()) {        icon.setImageResource(R.drawable.alarm);        row.setBackgroundColor(Color.RED);      } else if (mo.ismWarning()){        icon.setImageResource(R.drawable.warning);        row.setBackgroundColor(Color.YELLOW);      } else {        icon.setImageResource(R.drawable.ok);        row.setBackgroundColor(Color.GREEN);      }      return row;}  }  private List<MonitorObject> getMonitorObjects() {    List<MonitorObject> mos = new ArrayList<MonitorObject>();    mos.add(new MonitorObject(15000, 20000, 25000));    mos.add(new MonitorObject(15000, 14000, 18000));    mos.add(new MonitorObject(15000, 12000, 14000));    mos.add(new MonitorObject(100, 200, 250));    mos.add(new MonitorObject(3000, 2500, 3500));    return mos;  }}