java-Android ListActivity基于对象状态的行颜色

概述我有一个ListActivity显示列表中的一堆对象.我想更改背景&基于MonitorObject中两个布尔值的状态的行文本颜色.我是否需要扩展ArrayAdapter？如果是这样,那么代码示例将不胜感激,因为我已经尝试了几天,但没有成功.publicclassLwmextendsListActivity{@Overridepublicvo

我有一个ListActivity显示列表中的一堆对象.我想更改背景&基于MonitorObject中两个布尔值的状态的行文本颜色.

我是否需要扩展ArrayAdapter？如果是这样,那么代码示例将不胜感激,因为我已经尝试了几天,但没有成功.

public class Lwm extends ListActivity {  @OverrIDe  public voID onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentVIEw(R.layout.List);    setlistadapter(new ArrayAdapter<MonitorObject>(this, R.layout.row, getMonitorObjects()));  }  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;  }}

public class MonitorObject {  private int mTimetotal;  private int mWarningThreshold;  private int mAlarmThreshold;`enter code here`  private boolean mWarning;  private boolean mAlarm;  public MonitorObject(int timetotal, int warningThreshold, int alarmThreshold) {    this.mTimetotal = timetotal;    this.mWarningThreshold = warningThreshold;    this.mAlarmThreshold = alarmThreshold;      mWarning = (mTimetotal > mWarningThreshold) ? true : false;    mAlarm = (mTimetotal > mAlarmThreshold) ? true : false;  }  /*getters, setters, tostring goes here*/}

解决方法:

我在commonsware.com上的“ 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 *** 作的出色教程.还可以在YouTube上查看Google I/O 2010 – The world of ListView,它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;  }}

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