src/com/android/settings/datausage/DataUsageSummaryPreference.java - LeafOS-Project/android_packages_apps_Settings - Gitiles

 /*
  * Copyright (C) 2018 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 package com.android.settings.datausage;

 import android.annotation.AttrRes;
 import android.content.Context;
 import android.content.Intent;
 import android.graphics.Typeface;
 import android.net.NetworkTemplate;
 import android.os.Bundle;
 import android.text.Spannable;
 import android.text.SpannableString;
 import android.text.TextUtils;
 import android.text.format.Formatter;
 import android.text.style.AbsoluteSizeSpan;
 import android.util.AttributeSet;
 import android.view.View;
 import android.widget.Button;
 import android.widget.ProgressBar;
 import android.widget.TextView;

 import androidx.annotation.VisibleForTesting;
 import androidx.preference.Preference;
 import androidx.preference.PreferenceViewHolder;

 import com.android.internal.logging.nano.MetricsProto;
 import com.android.settings.R;
 import com.android.settings.core.SubSettingLauncher;
 import com.android.settingslib.Utils;
 import com.android.settingslib.net.DataUsageController;
 import com.android.settingslib.utils.StringUtil;

 import java.util.Objects;
 import java.util.concurrent.TimeUnit;

 /**
  * Provides a summary of data usage.
  */
 public class DataUsageSummaryPreference extends Preference {
     private static final long MILLIS_IN_A_DAY = TimeUnit.DAYS.toMillis(1);
     private static final long WARNING_AGE = TimeUnit.HOURS.toMillis(6L);
     @VisibleForTesting
     static final Typeface SANS_SERIF_MEDIUM =
             Typeface.create("sans-serif-medium", Typeface.NORMAL);

     private boolean mChartEnabled = true;
     private CharSequence mStartLabel;
     private CharSequence mEndLabel;

     /** large vs small size is 36/16 ~ 2.25 */
     private static final float LARGER_FONT_RATIO = 2.25f;
     private static final float SMALLER_FONT_RATIO = 1.0f;

     private boolean mDefaultTextColorSet;
     private int mDefaultTextColor;
     private int mNumPlans;
     /** The ending time of the billing cycle in milliseconds since epoch. */
     private long mCycleEndTimeMs;
     /** The time of the last update in standard milliseconds since the epoch */
     private long mSnapshotTimeMs;
     /** Name of carrier, or null if not available */
     private CharSequence mCarrierName;
     private CharSequence mLimitInfoText;
     private Intent mLaunchIntent;

     /** Progress to display on ProgressBar */
     private float mProgress;
     private boolean mHasMobileData;

     /**
      * The size of the first registered plan if one exists or the size of the warning if it is set.
      * -1 if no information is available.
      */
     private long mDataplanSize;

     /** The number of bytes used since the start of the cycle. */
     private long mDataplanUse;

     /** WiFi only mode */
     private boolean mWifiMode;
     private String mUsagePeriod;

     public DataUsageSummaryPreference(Context context, AttributeSet attrs) {
         super(context, attrs);
         setLayoutResource(R.layout.data_usage_summary_preference);
     }

     public void setLimitInfo(CharSequence text) {
         if (!Objects.equals(text, mLimitInfoText)) {
             mLimitInfoText = text;
             notifyChanged();
         }
     }

     public void setProgress(float progress) {
         mProgress = progress;
         notifyChanged();
     }

     public void setUsageInfo(long cycleEnd, long snapshotTime, CharSequence carrierName,
             int numPlans, Intent launchIntent) {
         mCycleEndTimeMs = cycleEnd;
         mSnapshotTimeMs = snapshotTime;
         mCarrierName = carrierName;
         mNumPlans = numPlans;
         mLaunchIntent = launchIntent;
         notifyChanged();
     }

     public void setChartEnabled(boolean enabled) {
         if (mChartEnabled != enabled) {
             mChartEnabled = enabled;
             notifyChanged();
         }
     }

     public void setLabels(CharSequence start, CharSequence end) {
         mStartLabel = start;
         mEndLabel = end;
         notifyChanged();
     }

     void setUsageNumbers(long used, long dataPlanSize, boolean hasMobileData) {
         mDataplanUse = used;
         mDataplanSize = dataPlanSize;
         mHasMobileData = hasMobileData;
         notifyChanged();
     }

     void setWifiMode(boolean isWifiMode, String usagePeriod) {
         mWifiMode = isWifiMode;
         mUsagePeriod = usagePeriod;
         notifyChanged();
     }

     @Override
     public void onBindViewHolder(PreferenceViewHolder holder) {
         super.onBindViewHolder(holder);

         ProgressBar bar = (ProgressBar) holder.findViewById(R.id.determinateBar);
         if (mChartEnabled && (!TextUtils.isEmpty(mStartLabel) || !TextUtils.isEmpty(mEndLabel))) {
             bar.setVisibility(View.VISIBLE);
             holder.findViewById(R.id.label_bar).setVisibility(View.VISIBLE);
             bar.setProgress((int) (mProgress * 100));
             ((TextView) holder.findViewById(android.R.id.text1)).setText(mStartLabel);
             ((TextView) holder.findViewById(android.R.id.text2)).setText(mEndLabel);
         } else {
             bar.setVisibility(View.GONE);
             holder.findViewById(R.id.label_bar).setVisibility(View.GONE);
         }

         updateDataUsageLabels(holder);

         TextView usageTitle = (TextView) holder.findViewById(R.id.usage_title);
         TextView carrierInfo = (TextView) holder.findViewById(R.id.carrier_and_update);
         Button launchButton = (Button) holder.findViewById(R.id.launch_mdp_app_button);
         TextView limitInfo = (TextView) holder.findViewById(R.id.data_limits);

         if (mWifiMode) {
             usageTitle.setText(R.string.data_usage_wifi_title);
             usageTitle.setVisibility(View.VISIBLE);
             TextView cycleTime = (TextView) holder.findViewById(R.id.cycle_left_time);
             cycleTime.setText(mUsagePeriod);
             carrierInfo.setVisibility(View.GONE);
             limitInfo.setVisibility(View.GONE);

             final long usageLevel = getHistoricalUsageLevel();
             if (usageLevel > 0L) {
                 launchButton.setOnClickListener((view) -> {
                     launchWifiDataUsage(getContext());
                 });
             } else {
                 launchButton.setEnabled(false);
             }
             launchButton.setText(R.string.launch_wifi_text);
             launchButton.setVisibility(View.VISIBLE);
         } else {
             usageTitle.setVisibility(mNumPlans > 1 ? View.VISIBLE : View.GONE);
             updateCycleTimeText(holder);
             updateCarrierInfo(carrierInfo);
             if (mLaunchIntent != null) {
                 launchButton.setOnClickListener((view) -> {
                     getContext().startActivity(mLaunchIntent);
                 });
                 launchButton.setVisibility(View.VISIBLE);
             } else {
                 launchButton.setVisibility(View.GONE);
             }
             limitInfo.setVisibility(
                     TextUtils.isEmpty(mLimitInfoText) ? View.GONE : View.VISIBLE);
             limitInfo.setText(mLimitInfoText);
         }
     }

     private static void launchWifiDataUsage(Context context) {
         final Bundle args = new Bundle(1);
         args.putParcelable(DataUsageList.EXTRA_NETWORK_TEMPLATE,
                 NetworkTemplate.buildTemplateWifiWildcard());
         final SubSettingLauncher launcher = new SubSettingLauncher(context)
                 .setArguments(args)
                 .setDestination(DataUsageList.class.getName())
                 .setSourceMetricsCategory(MetricsProto.MetricsEvent.VIEW_UNKNOWN);
         launcher.setTitleRes(R.string.wifi_data_usage);
         launcher.launch();
     }

     private void updateDataUsageLabels(PreferenceViewHolder holder) {
         TextView usageNumberField = (TextView) holder.findViewById(R.id.data_usage_view);

         final Formatter.BytesResult usedResult = Formatter.formatBytes(getContext().getResources(),
                 mDataplanUse, Formatter.FLAG_CALCULATE_ROUNDED | Formatter.FLAG_IEC_UNITS);
         final SpannableString usageNumberText = new SpannableString(usedResult.value);
         final int textSize =
                 getContext().getResources().getDimensionPixelSize(R.dimen.usage_number_text_size);
         usageNumberText.setSpan(new AbsoluteSizeSpan(textSize), 0, usageNumberText.length(),
                 Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
         CharSequence template = getContext().getText(R.string.data_used_formatted);

         CharSequence usageText =
                 TextUtils.expandTemplate(template, usageNumberText, usedResult.units);
         usageNumberField.setText(usageText);

         final MeasurableLinearLayout layout =
                 (MeasurableLinearLayout) holder.findViewById(R.id.usage_layout);

         if (mHasMobileData && mNumPlans >= 0 && mDataplanSize > 0L) {
             TextView usageRemainingField = (TextView) holder.findViewById(R.id.data_remaining_view);
             long dataRemaining = mDataplanSize - mDataplanUse;
             if (dataRemaining >= 0) {
                 usageRemainingField.setText(
                         TextUtils.expandTemplate(getContext().getText(R.string.data_remaining),
                                 DataUsageUtils.formatDataUsage(getContext(), dataRemaining)));
                 usageRemainingField.setTextColor(
                         Utils.getColorAttr(getContext(), android.R.attr.colorAccent));
             } else {
                 usageRemainingField.setText(
                         TextUtils.expandTemplate(getContext().getText(R.string.data_overusage),
                                 DataUsageUtils.formatDataUsage(getContext(), -dataRemaining)));
                 usageRemainingField.setTextColor(
                         Utils.getColorAttr(getContext(), android.R.attr.colorError));
             }
             layout.setChildren(usageNumberField, usageRemainingField);
         } else {
             layout.setChildren(usageNumberField, null);
         }
     }

     private void updateCycleTimeText(PreferenceViewHolder holder) {
         TextView cycleTime = (TextView) holder.findViewById(R.id.cycle_left_time);

         long millisLeft = mCycleEndTimeMs - System.currentTimeMillis();
         if (millisLeft <= 0) {
             cycleTime.setText(getContext().getString(R.string.billing_cycle_none_left));
         } else {
             int daysLeft = (int) (millisLeft / MILLIS_IN_A_DAY);
             cycleTime.setText(daysLeft < 1
                     ? getContext().getString(R.string.billing_cycle_less_than_one_day_left)
                     : getContext().getResources().getQuantityString(
                             R.plurals.billing_cycle_days_left, daysLeft, daysLeft));
         }
     }


     private void updateCarrierInfo(TextView carrierInfo) {
         if (mNumPlans > 0 && mSnapshotTimeMs >= 0L) {
             carrierInfo.setVisibility(View.VISIBLE);
             long updateAgeMillis = calculateTruncatedUpdateAge();

             int textResourceId;
             CharSequence updateTime = null;
             if (updateAgeMillis == 0) {
                 if (mCarrierName != null) {
                     textResourceId = R.string.carrier_and_update_now_text;
                 } else {
                     textResourceId = R.string.no_carrier_update_now_text;
                 }
             } else {
                 if (mCarrierName != null) {
                     textResourceId = R.string.carrier_and_update_text;
                 } else {
                     textResourceId = R.string.no_carrier_update_text;
                 }
                 updateTime = StringUtil.formatElapsedTime(
                         getContext(), updateAgeMillis, false /* withSeconds */);
             }
             carrierInfo.setText(TextUtils.expandTemplate(
                     getContext().getText(textResourceId),
                     mCarrierName,
                     updateTime));

             if (updateAgeMillis <= WARNING_AGE) {
                 setCarrierInfoTextStyle(
                         carrierInfo, android.R.attr.textColorSecondary, Typeface.SANS_SERIF);
             } else {
                 setCarrierInfoTextStyle(carrierInfo, android.R.attr.colorError, SANS_SERIF_MEDIUM);
             }
         } else {
             carrierInfo.setVisibility(View.GONE);
         }
     }

     /**
      * Returns the time since the last carrier update, as defined by {@link #mSnapshotTimeMs},
      * truncated to the nearest day / hour / minute in milliseconds, or 0 if less than 1 min.
      */
     private long calculateTruncatedUpdateAge() {
         long updateAgeMillis = System.currentTimeMillis() - mSnapshotTimeMs;

         // Round to nearest whole unit
         if (updateAgeMillis >= TimeUnit.DAYS.toMillis(1)) {
             return (updateAgeMillis / TimeUnit.DAYS.toMillis(1)) * TimeUnit.DAYS.toMillis(1);
         } else if (updateAgeMillis >= TimeUnit.HOURS.toMillis(1)) {
             return (updateAgeMillis / TimeUnit.HOURS.toMillis(1)) * TimeUnit.HOURS.toMillis(1);
         } else if (updateAgeMillis >= TimeUnit.MINUTES.toMillis(1)) {
             return (updateAgeMillis / TimeUnit.MINUTES.toMillis(1)) * TimeUnit.MINUTES.toMillis(1);
         } else {
             return 0;
         }
     }

     private void setCarrierInfoTextStyle(
             TextView carrierInfo, @AttrRes int colorId, Typeface typeface) {
         carrierInfo.setTextColor(Utils.getColorAttr(getContext(), colorId));
         carrierInfo.setTypeface(typeface);
     }

     @VisibleForTesting
     long getHistoricalUsageLevel() {
         final DataUsageController controller = new DataUsageController(getContext());
         return controller.getHistoricalUsageLevel(NetworkTemplate.buildTemplateWifiWildcard());
     }

 }
	/*
	* Copyright (C) 2018 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	package com.android.settings.datausage;

	import android.annotation.AttrRes;
	import android.content.Context;
	import android.content.Intent;
	import android.graphics.Typeface;
	import android.net.NetworkTemplate;
	import android.os.Bundle;
	import android.text.Spannable;
	import android.text.SpannableString;
	import android.text.TextUtils;
	import android.text.format.Formatter;
	import android.text.style.AbsoluteSizeSpan;
	import android.util.AttributeSet;
	import android.view.View;
	import android.widget.Button;
	import android.widget.ProgressBar;
	import android.widget.TextView;

	import androidx.annotation.VisibleForTesting;
	import androidx.preference.Preference;
	import androidx.preference.PreferenceViewHolder;

	import com.android.internal.logging.nano.MetricsProto;
	import com.android.settings.R;
	import com.android.settings.core.SubSettingLauncher;
	import com.android.settingslib.Utils;
	import com.android.settingslib.net.DataUsageController;
	import com.android.settingslib.utils.StringUtil;

	import java.util.Objects;
	import java.util.concurrent.TimeUnit;

	/**
	* Provides a summary of data usage.
	*/
	public class DataUsageSummaryPreference extends Preference {
	private static final long MILLIS_IN_A_DAY = TimeUnit.DAYS.toMillis(1);
	private static final long WARNING_AGE = TimeUnit.HOURS.toMillis(6L);
	@VisibleForTesting
	static final Typeface SANS_SERIF_MEDIUM =
	Typeface.create("sans-serif-medium", Typeface.NORMAL);

	private boolean mChartEnabled = true;
	private CharSequence mStartLabel;
	private CharSequence mEndLabel;

	/** large vs small size is 36/16 ~ 2.25 */
	private static final float LARGER_FONT_RATIO = 2.25f;
	private static final float SMALLER_FONT_RATIO = 1.0f;

	private boolean mDefaultTextColorSet;
	private int mDefaultTextColor;
	private int mNumPlans;
	/** The ending time of the billing cycle in milliseconds since epoch. */
	private long mCycleEndTimeMs;
	/** The time of the last update in standard milliseconds since the epoch */
	private long mSnapshotTimeMs;
	/** Name of carrier, or null if not available */
	private CharSequence mCarrierName;
	private CharSequence mLimitInfoText;
	private Intent mLaunchIntent;

	/** Progress to display on ProgressBar */
	private float mProgress;
	private boolean mHasMobileData;

	/**
	* The size of the first registered plan if one exists or the size of the warning if it is set.
	* -1 if no information is available.
	*/
	private long mDataplanSize;

	/** The number of bytes used since the start of the cycle. */
	private long mDataplanUse;

	/** WiFi only mode */
	private boolean mWifiMode;
	private String mUsagePeriod;

	public DataUsageSummaryPreference(Context context, AttributeSet attrs) {
	super(context, attrs);
	setLayoutResource(R.layout.data_usage_summary_preference);
	}

	public void setLimitInfo(CharSequence text) {
	if (!Objects.equals(text, mLimitInfoText)) {
	mLimitInfoText = text;
	notifyChanged();
	}
	}

	public void setProgress(float progress) {
	mProgress = progress;
	notifyChanged();
	}

	public void setUsageInfo(long cycleEnd, long snapshotTime, CharSequence carrierName,
	int numPlans, Intent launchIntent) {
	mCycleEndTimeMs = cycleEnd;
	mSnapshotTimeMs = snapshotTime;
	mCarrierName = carrierName;
	mNumPlans = numPlans;
	mLaunchIntent = launchIntent;
	notifyChanged();
	}

	public void setChartEnabled(boolean enabled) {
	if (mChartEnabled != enabled) {
	mChartEnabled = enabled;
	notifyChanged();
	}
	}

	public void setLabels(CharSequence start, CharSequence end) {
	mStartLabel = start;
	mEndLabel = end;
	notifyChanged();
	}

	void setUsageNumbers(long used, long dataPlanSize, boolean hasMobileData) {
	mDataplanUse = used;
	mDataplanSize = dataPlanSize;
	mHasMobileData = hasMobileData;
	notifyChanged();
	}

	void setWifiMode(boolean isWifiMode, String usagePeriod) {
	mWifiMode = isWifiMode;
	mUsagePeriod = usagePeriod;
	notifyChanged();
	}

	@Override
	public void onBindViewHolder(PreferenceViewHolder holder) {
	super.onBindViewHolder(holder);

	ProgressBar bar = (ProgressBar) holder.findViewById(R.id.determinateBar);
	if (mChartEnabled && (!TextUtils.isEmpty(mStartLabel) \|\| !TextUtils.isEmpty(mEndLabel))) {
	bar.setVisibility(View.VISIBLE);
	holder.findViewById(R.id.label_bar).setVisibility(View.VISIBLE);
	bar.setProgress((int) (mProgress * 100));
	((TextView) holder.findViewById(android.R.id.text1)).setText(mStartLabel);
	((TextView) holder.findViewById(android.R.id.text2)).setText(mEndLabel);
	} else {
	bar.setVisibility(View.GONE);
	holder.findViewById(R.id.label_bar).setVisibility(View.GONE);
	}

	updateDataUsageLabels(holder);

	TextView usageTitle = (TextView) holder.findViewById(R.id.usage_title);
	TextView carrierInfo = (TextView) holder.findViewById(R.id.carrier_and_update);
	Button launchButton = (Button) holder.findViewById(R.id.launch_mdp_app_button);
	TextView limitInfo = (TextView) holder.findViewById(R.id.data_limits);

	if (mWifiMode) {
	usageTitle.setText(R.string.data_usage_wifi_title);
	usageTitle.setVisibility(View.VISIBLE);
	TextView cycleTime = (TextView) holder.findViewById(R.id.cycle_left_time);
	cycleTime.setText(mUsagePeriod);
	carrierInfo.setVisibility(View.GONE);
	limitInfo.setVisibility(View.GONE);

	final long usageLevel = getHistoricalUsageLevel();
	if (usageLevel > 0L) {
	launchButton.setOnClickListener((view) -> {
	launchWifiDataUsage(getContext());
	});
	} else {
	launchButton.setEnabled(false);
	}
	launchButton.setText(R.string.launch_wifi_text);
	launchButton.setVisibility(View.VISIBLE);
	} else {
	usageTitle.setVisibility(mNumPlans > 1 ? View.VISIBLE : View.GONE);
	updateCycleTimeText(holder);
	updateCarrierInfo(carrierInfo);
	if (mLaunchIntent != null) {
	launchButton.setOnClickListener((view) -> {
	getContext().startActivity(mLaunchIntent);
	});
	launchButton.setVisibility(View.VISIBLE);
	} else {
	launchButton.setVisibility(View.GONE);
	}
	limitInfo.setVisibility(
	TextUtils.isEmpty(mLimitInfoText) ? View.GONE : View.VISIBLE);
	limitInfo.setText(mLimitInfoText);
	}
	}

	private static void launchWifiDataUsage(Context context) {
	final Bundle args = new Bundle(1);
	args.putParcelable(DataUsageList.EXTRA_NETWORK_TEMPLATE,
	NetworkTemplate.buildTemplateWifiWildcard());
	final SubSettingLauncher launcher = new SubSettingLauncher(context)
	.setArguments(args)
	.setDestination(DataUsageList.class.getName())
	.setSourceMetricsCategory(MetricsProto.MetricsEvent.VIEW_UNKNOWN);
	launcher.setTitleRes(R.string.wifi_data_usage);
	launcher.launch();
	}

	private void updateDataUsageLabels(PreferenceViewHolder holder) {
	TextView usageNumberField = (TextView) holder.findViewById(R.id.data_usage_view);

	final Formatter.BytesResult usedResult = Formatter.formatBytes(getContext().getResources(),
	mDataplanUse, Formatter.FLAG_CALCULATE_ROUNDED \| Formatter.FLAG_IEC_UNITS);
	final SpannableString usageNumberText = new SpannableString(usedResult.value);
	final int textSize =
	getContext().getResources().getDimensionPixelSize(R.dimen.usage_number_text_size);
	usageNumberText.setSpan(new AbsoluteSizeSpan(textSize), 0, usageNumberText.length(),
	Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
	CharSequence template = getContext().getText(R.string.data_used_formatted);

	CharSequence usageText =
	TextUtils.expandTemplate(template, usageNumberText, usedResult.units);
	usageNumberField.setText(usageText);

	final MeasurableLinearLayout layout =
	(MeasurableLinearLayout) holder.findViewById(R.id.usage_layout);

	if (mHasMobileData && mNumPlans >= 0 && mDataplanSize > 0L) {
	TextView usageRemainingField = (TextView) holder.findViewById(R.id.data_remaining_view);
	long dataRemaining = mDataplanSize - mDataplanUse;
	if (dataRemaining >= 0) {
	usageRemainingField.setText(
	TextUtils.expandTemplate(getContext().getText(R.string.data_remaining),
	DataUsageUtils.formatDataUsage(getContext(), dataRemaining)));
	usageRemainingField.setTextColor(
	Utils.getColorAttr(getContext(), android.R.attr.colorAccent));
	} else {
	usageRemainingField.setText(
	TextUtils.expandTemplate(getContext().getText(R.string.data_overusage),
	DataUsageUtils.formatDataUsage(getContext(), -dataRemaining)));
	usageRemainingField.setTextColor(
	Utils.getColorAttr(getContext(), android.R.attr.colorError));
	}
	layout.setChildren(usageNumberField, usageRemainingField);
	} else {
	layout.setChildren(usageNumberField, null);
	}
	}

	private void updateCycleTimeText(PreferenceViewHolder holder) {
	TextView cycleTime = (TextView) holder.findViewById(R.id.cycle_left_time);

	long millisLeft = mCycleEndTimeMs - System.currentTimeMillis();
	if (millisLeft <= 0) {
	cycleTime.setText(getContext().getString(R.string.billing_cycle_none_left));
	} else {
	int daysLeft = (int) (millisLeft / MILLIS_IN_A_DAY);
	cycleTime.setText(daysLeft < 1
	? getContext().getString(R.string.billing_cycle_less_than_one_day_left)
	: getContext().getResources().getQuantityString(
	R.plurals.billing_cycle_days_left, daysLeft, daysLeft));
	}
	}


	private void updateCarrierInfo(TextView carrierInfo) {
	if (mNumPlans > 0 && mSnapshotTimeMs >= 0L) {
	carrierInfo.setVisibility(View.VISIBLE);
	long updateAgeMillis = calculateTruncatedUpdateAge();

	int textResourceId;
	CharSequence updateTime = null;
	if (updateAgeMillis == 0) {
	if (mCarrierName != null) {
	textResourceId = R.string.carrier_and_update_now_text;
	} else {
	textResourceId = R.string.no_carrier_update_now_text;
	}
	} else {
	if (mCarrierName != null) {
	textResourceId = R.string.carrier_and_update_text;
	} else {
	textResourceId = R.string.no_carrier_update_text;
	}
	updateTime = StringUtil.formatElapsedTime(
	getContext(), updateAgeMillis, false /* withSeconds */);
	}
	carrierInfo.setText(TextUtils.expandTemplate(
	getContext().getText(textResourceId),
	mCarrierName,
	updateTime));

	if (updateAgeMillis <= WARNING_AGE) {
	setCarrierInfoTextStyle(
	carrierInfo, android.R.attr.textColorSecondary, Typeface.SANS_SERIF);
	} else {
	setCarrierInfoTextStyle(carrierInfo, android.R.attr.colorError, SANS_SERIF_MEDIUM);
	}
	} else {
	carrierInfo.setVisibility(View.GONE);
	}
	}

	/**
	* Returns the time since the last carrier update, as defined by {@link #mSnapshotTimeMs},
	* truncated to the nearest day / hour / minute in milliseconds, or 0 if less than 1 min.
	*/
	private long calculateTruncatedUpdateAge() {
	long updateAgeMillis = System.currentTimeMillis() - mSnapshotTimeMs;

	// Round to nearest whole unit
	if (updateAgeMillis >= TimeUnit.DAYS.toMillis(1)) {
	return (updateAgeMillis / TimeUnit.DAYS.toMillis(1)) * TimeUnit.DAYS.toMillis(1);
	} else if (updateAgeMillis >= TimeUnit.HOURS.toMillis(1)) {
	return (updateAgeMillis / TimeUnit.HOURS.toMillis(1)) * TimeUnit.HOURS.toMillis(1);
	} else if (updateAgeMillis >= TimeUnit.MINUTES.toMillis(1)) {
	return (updateAgeMillis / TimeUnit.MINUTES.toMillis(1)) * TimeUnit.MINUTES.toMillis(1);
	} else {
	return 0;
	}
	}

	private void setCarrierInfoTextStyle(
	TextView carrierInfo, @AttrRes int colorId, Typeface typeface) {
	carrierInfo.setTextColor(Utils.getColorAttr(getContext(), colorId));
	carrierInfo.setTypeface(typeface);
	}

	@VisibleForTesting
	long getHistoricalUsageLevel() {
	final DataUsageController controller = new DataUsageController(getContext());
	return controller.getHistoricalUsageLevel(NetworkTemplate.buildTemplateWifiWildcard());
	}

	}