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/*
* Copyright (C) 2015 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.example.android.bluetoothadvertisements;
import android.bluetooth.le.ScanResult;
import android.content.Context;
import android.os.SystemClock;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.concurrent.TimeUnit;
/**
* Holds and displays {@link ScanResult}s, used by {@link ScannerFragment}.
*/
public class ScanResultAdapter extends BaseAdapter {
private ArrayList<ScanResult> mArrayList;
private Context mContext;
private LayoutInflater mInflater;
ScanResultAdapter(Context context, LayoutInflater inflater) {
super();
mContext = context;
mInflater = inflater;
mArrayList = new ArrayList<>();
}
@Override
public int getCount() {
return mArrayList.size();
}
@Override
public Object getItem(int position) {
return mArrayList.get(position);
}
@Override
public long getItemId(int position) {
return mArrayList.get(position).getDevice().getAddress().hashCode();
}
@Override
public View getView(int position, View view, ViewGroup parent) {
// Reuse an old view if we can, otherwise create a new one.
if (view == null) {
view = mInflater.inflate(R.layout.listitem_scanresult, null);
}
TextView deviceNameView = (TextView) view.findViewById(R.id.device_name);
TextView deviceAddressView = (TextView) view.findViewById(R.id.device_address);
TextView lastSeenView = (TextView) view.findViewById(R.id.last_seen);
ScanResult scanResult = mArrayList.get(position);
String name = scanResult.getDevice().getName();
if (name == null) {
name = mContext.getResources().getString(R.string.no_name);
}
deviceNameView.setText(name);
deviceAddressView.setText(scanResult.getDevice().getAddress());
lastSeenView.setText(getTimeSinceString(mContext, scanResult.getTimestampNanos()));
return view;
}
/**
* Search the adapter for an existing device address and return it, otherwise return -1.
*/
private int getPosition(String address) {
int position = -1;
for (int i = 0; i < mArrayList.size(); i++) {
if (mArrayList.get(i).getDevice().getAddress().equals(address)) {
position = i;
break;
}
}
return position;
}
/**
* Add a ScanResult item to the adapter if a result from that device isn't already present.
* Otherwise updates the existing position with the new ScanResult.
*/
public void add(ScanResult scanResult) {
int existingPosition = getPosition(scanResult.getDevice().getAddress());
if (existingPosition >= 0) {
// Device is already in list, update its record.
mArrayList.set(existingPosition, scanResult);
} else {
// Add new Device's ScanResult to list.
mArrayList.add(scanResult);
}
}
/**
* Clear out the adapter.
*/
public void clear() {
mArrayList.clear();
}
/**
* Takes in a number of nanoseconds and returns a human-readable string giving a vague
* description of how long ago that was.
*/
public static String getTimeSinceString(Context context, long timeNanoseconds) {
String lastSeenText = context.getResources().getString(R.string.last_seen) + " ";
long timeSince = SystemClock.elapsedRealtimeNanos() - timeNanoseconds;
long secondsSince = TimeUnit.SECONDS.convert(timeSince, TimeUnit.NANOSECONDS);
if (secondsSince < 5) {
lastSeenText += context.getResources().getString(R.string.just_now);
} else if (secondsSince < 60) {
lastSeenText += secondsSince + " " + context.getResources()
.getString(R.string.seconds_ago);
} else {
long minutesSince = TimeUnit.MINUTES.convert(secondsSince, TimeUnit.SECONDS);
if (minutesSince < 60) {
if (minutesSince == 1) {
lastSeenText += minutesSince + " " + context.getResources()
.getString(R.string.minute_ago);
} else {
lastSeenText += minutesSince + " " + context.getResources()
.getString(R.string.minutes_ago);
}
} else {
long hoursSince = TimeUnit.HOURS.convert(minutesSince, TimeUnit.MINUTES);
if (hoursSince == 1) {
lastSeenText += hoursSince + " " + context.getResources()
.getString(R.string.hour_ago);
} else {
lastSeenText += hoursSince + " " + context.getResources()
.getString(R.string.hours_ago);
}
}
}
return lastSeenText;
}
}
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