Android 3.0自带的天气预报例子代码
2011-03-19 11:57:21 来源:本站整理assert(uri.getPathSegments().isEmpty());
final MatrixCursor c = new MatrixCursor(
new String[]{ Columns.ID, Columns.CITY, Columns.TEMPERATURE });
for (int i = 0; i < sData.size(); ++i) {
final WeatherDataPoint data = sData.get(i);
c.addRow(new Object[]{ new Integer(i), data.city, new Integer(data.degrees) });
}
return c;
}
@Override
public String getType(Uri uri) {
return "vnd.android.cursor.dir/vnd.weatherlistwidget.citytemperature";
}
@Override
public Uri insert(Uri uri, ContentValues values) {
return null;
}
@Override
public int delete(Uri uri, String selection, String[] selectionArgs) {
return 0;
}
@Override
public synchronized int update(Uri uri, ContentValues values, String selection,
String[] selectionArgs) {
assert(uri.getPathSegments().size() == 1);
final int index = Integer.parseInt(uri.getPathSegments().get(0));
final MatrixCursor c = new MatrixCursor(
new String[]{ Columns.ID, Columns.CITY, Columns.TEMPERATURE });
assert(0 <= index && index < sData.size());
final WeatherDataPoint data = sData.get(index);
data.degrees = values.getAsInteger(Columns.TEMPERATURE);
getContext().getContentResolver().notifyChange(uri, null);
return 1;
}
}
上面可以看到,对于插入和删除没有做过多的处理,对于天气更新给出了详细的解决方法。
有关 WeatherWidgetProvider.java 主要是appWidget的核心,为provider
class WeatherDataProviderObserver extends ContentObserver { //监控数据库的变化
private AppWidgetManager mAppWidgetManager;
private ComponentName mComponentName;
WeatherDataProviderObserver(AppWidgetManager mgr, ComponentName cn, Handler h) {
super(h);
mAppWidgetManager = mgr;
mComponentName = cn;
}
@Override
public void onChange(boolean selfChange) {
mAppWidgetManager.notifyAppWidgetViewDataChanged(
mAppWidgetManager.getAppWidgetIds(mComponentName), R.id.weather_list);
}
}
public class WeatherWidgetProvider extends AppWidgetProvider {
public static String CLICK_ACTION = "com.example.android.weatherlistwidget.CLICK";
public static String REFRESH_ACTION = "com.example.android.weatherlistwidget.REFRESH";
public static String EXTRA_CITY_ID = "com.example.android.weatherlistwidget.city";
private static HandlerThread sWorkerThread;
private static Handler sWorkerQueue;
private static WeatherDataProviderObserver sDataObserver;
public WeatherWidgetProvider() {
sWorkerThread = new HandlerThread("WeatherWidgetProvider-worker"); //开一个线程,这里用到了HandlerThread
sWorkerThread.start();
sWorkerQueue = new Handler(sWorkerThread.getLooper()); //不了解Thread的Looper可以看下这个例子比较简单清晰
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