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package com.android.datetimepicker;
import android.app.Service;
import android.content.Context;
import android.database.ContentObserver;
import android.net.Uri;
import android.os.SystemClock;
import android.os.Vibrator;
import android.provider.Settings;
/**
* A simple utility class to handle haptic feedback.
*/
public class HapticFeedbackController {
private static final int VIBRATE_DELAY_MS = 125;
private static final int VIBRATE_LENGTH_MS = 5;
private static boolean checkGlobalSetting(Context context) {
return Settings.System.getInt(context.getContentResolver(),
Settings.System.HAPTIC_FEEDBACK_ENABLED, 0) == 1;
}
private final Context mContext;
private final ContentObserver mContentObserver;
private Vibrator mVibrator;
private boolean mIsGloballyEnabled;
private long mLastVibrate;
public HapticFeedbackController(Context context) {
mContext = context;
mContentObserver = new ContentObserver(null) {
@Override
public void onChange(boolean selfChange) {
mIsGloballyEnabled = checkGlobalSetting(mContext);
}
};
}
/**
* Call to setup the controller.
*/
public void start() {
mVibrator = (Vibrator) mContext.getSystemService(Service.VIBRATOR_SERVICE);
// Setup a listener for changes in haptic feedback settings
mIsGloballyEnabled = checkGlobalSetting(mContext);
Uri uri = Settings.System.getUriFor(Settings.System.HAPTIC_FEEDBACK_ENABLED);
mContext.getContentResolver().registerContentObserver(uri, false, mContentObserver);
}
/**
* Call this when you don't need the controller anymore.
*/
public void stop() {
mVibrator = null;
mContext.getContentResolver().unregisterContentObserver(mContentObserver);
}
/**
* Try to vibrate. To prevent this becoming a single continuous vibration, nothing will
* happen if we have vibrated very recently.
*/
public void tryVibrate() {
if (mVibrator != null && mIsGloballyEnabled) {
long now = SystemClock.uptimeMillis();
// We want to try to vibrate each individual tick discretely.
if (now - mLastVibrate >= VIBRATE_DELAY_MS) {
mVibrator.vibrate(VIBRATE_LENGTH_MS);
mLastVibrate = now;
}
}
}
}
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