如何检查哪个 ContentObserver 触发了 onChange 方法

Question

我想做的是注册一个Service，注册多个ContentObserver，并检查哪个ContentObserver触发onChange()进行特定反应。我不知道我是否只需要在onchange()中包含if/else，或者将其Overwrite到每个ContentObserver，无论哪种情况，我都不知道该怎么做。提前感谢任何帮助。

public class SmsObserverService extends Service {
private String BABAS = "babas";
@Override
public void onCreate() {
    Handler handler = new Handler();
    this.getContentResolver().registerContentObserver(Uri.parse("content://sms/"), true, new SmsObserver(handler));
    //Second observer
    this.getContentResolver().registerContentObserver(Uri.parse("CallLog.Calls.CONTENT_URI"), true, new SmsObserver(handler));
}

@Override
public IBinder onBind(Intent intent) {
    // TODO Put your code here
    return null;
}

public class SmsObserver extends ContentObserver{
    public SmsObserver(Handler handler) {
        super(handler);

    }
    @Override
    public void onChange(boolean selfChange) {          
        super.onChange(selfChange);
        //Where I should check somehow which ContentObserver triggers the onChange

        //This code to the sms log stuff, the call log part will be included
        //when I find out how to check whic observer trigerred the onChange
        Uri uri = Uri.parse("content://sms/");
        Cursor cursor = getApplicationContext().getContentResolver().query( uri, null, null, null, null);
        cursor.moveToNext();

        String body = cursor.getString(cursor.getColumnIndex("body"));
        String add = cursor.getString(cursor.getColumnIndex("address"));
        String time = cursor.getString(cursor.getColumnIndex("date"));

        String protocol = cursor.getString(cursor.getColumnIndex("protocol"));
        if(protocol == null){
            Toast.makeText(getApplicationContext(), "Enviada para: " +add + ", Hora: "+time +" - "+body, Toast.LENGTH_SHORT).show();
            Log.i(BABAS, "Enviada para: "+add +" " +"Time: "+time +" - "+body);
        }else{
            Toast.makeText(getApplicationContext(), "Recebida de: "+add + ", Hora: "+time +" - "+body, Toast.LENGTH_SHORT).show();
            Log.i(BABAS, "Recebida de: "+add +" " +"Time: "+time +" - "+body);
        }
    }
}

}

Answer 1

我只是扩展ContentObserver并添加我在那里缺少的任何内容。

Answer 2

mObserver = new ContentObserver(new Handler(Looper.getMainLooper())) {
                @Override
                public void onChange(boolean selfChange, Uri uri) {
                    super.onChange(selfChange, uri);
                    }
                }
            };

您可以使用上述方法检查 uri