监控Android系统设置值

Question

我想观看系统设置,并在其值发生变化时收到通知.Cursor类有一个setNotificationUri方法听起来不错,但它不起作用,编码也觉得很奇怪...那就是我做的:

    // Create a content resolver and add a listener
    ContentResolver resolver = getContentResolver();
    resolver.addStatusChangeListener(ContentResolver.SYNC_OBSERVER_TYPE_SETTINGS | ContentResolver.SYNC_OBSERVER_TYPE_PENDING | ContentResolver.SYNC_OBSERVER_TYPE_ACTIVE, new MyObserver());

    // I somehow need to get an instance of Cursor to use setNotificationUri in the next step...
    Cursor cursor2 = resolver.query(Settings.System.CONTENT_URI, null, null, null, null);

    // For testing purposes monitor all system settings
    cursor2.setNotificationUri(resolver, Settings.System.CONTENT_URI);

听众:

public class MyObserver implements SyncStatusObserver {

public void onStatusChanged(int which) {
    Log.d("TEST", "status changed, which = " + which);

}
}

好吧,很明显,监听器永远不会被调用,我无法在logcat中找到具有指定TEST标签的条目):(对于测试,我在android设置菜单中手动将亮度设置从手动更改为自动).什么提示我做错了什么？还有其他更好的监控Android系统设置的方法吗？

谢谢你的提示!

Answer 1

这是一些示例代码:

ContentResolver contentResolver = getContentResolver();
Uri setting = Settings.System.getUriFor(Settings.System.ACCELEROMETER_ROTATION);

// Make a listener
ContentObserver observer = new ContentObserver(new Handler()) {
    @Override
    public void onChange(boolean selfChange) {
        super.onChange(selfChange);
    }

    @Override
    public boolean deliverSelfNotifications() {
        return true;
    }
};

// Start listening
contentResolver.registerContentObserver(setting, false, observer);

// Stop listening
contentResolver.unregisterContentObserver(observer);

有关更多详细信息,请查看这些方法的文档.

Answer 2

这是如何做到的,效果很好:如何为呼叫日志实现ContentObserver.请注意,当用户在系统首选项屏幕中按下后退键时,首先会写入/重新更改某些设置!