Develop Reference

Change Exoplayer HLS Quality

I'm trying to set video bitrate in Exoplayer. I had already set it like this:
trackSelector = new DefaultTrackSelector(factory);
DefaultTrackSelector.Parameters parameters = trackSelector.getParameters();
parameters.withMaxVideoBitrate(maxBitrate);
parameters.withExceedRendererCapabilitiesIfNecessary(false);
parameters.withExceedVideoConstraintsIfNecessary(false);
trackSelector.setParameters(parameters);
but it doesn't work. Everywhere I found something about this I've found people were using HlsChunk source which is private in Exoplayer 2.6. Can anyone help me, pls?

For those who need to set HLS quality according to their needs this is how it could be made, considering that about this topic there are several post on SO but no one is very clear.
As I write in 2019 I assume everyone is using ExoPlayer2.
This is the solution which gave us the best result.
DataSource.Factory dataSourceFactory = new DefaultDataSourceFactory(Objects.requireNonNull(getContext()),
Util.getUserAgent(this.getContext(), getResources().getString(R.string.app_name)));
trackSelector = new CustomTrackSelector();
videoSource = new HlsMediaSource.Factory(dataSourceFactory).createMediaSource(mp4VideoUri);
player = ExoPlayerFactory.newSimpleInstance(this.getContext(), trackSelector);
so what you should is just override the behavior of the custom track selector, overriding the selectTrack method
public class CustomTrackSelector extends DefaultTrackSelector
{
public CustomTrackSelector()
{
super();
}
protected #Nullable
TrackSelection selectVideoTrack(
TrackGroupArray groups,
int[][] formatSupports,
int mixedMimeTypeAdaptationSupports,
Parameters params,
#Nullable TrackSelection.Factory adaptiveTrackSelectionFactory)
throws ExoPlaybackException
{
AdaptiveTrackSelection adaptiveTrackSelection = null;
if (groups.length > 0)
{
for (int groupIndex = 0; groupIndex < groups.length; groupIndex++)
{
TrackGroup trackGroup = groups.get(groupIndex);
int[] tracks = new int[trackGroup.length];
//creation of indexes array
for (int i = 0; i < trackGroup.length; i++)
{
tracks[i] = i;
}
adaptiveTrackSelection = new AdaptiveTrackSelection(
trackGroup,
tracks,
new DefaultBandwidthMeter(),
AdaptiveTrackSelection.DEFAULT_MIN_DURATION_FOR_QUALITY_INCREASE_MS,
AdaptiveTrackSelection.DEFAULT_MAX_DURATION_FOR_QUALITY_DECREASE_MS,
AdaptiveTrackSelection.DEFAULT_MIN_DURATION_TO_RETAIN_AFTER_DISCARD_MS,
AdaptiveTrackSelection.DEFAULT_BANDWIDTH_FRACTION,
AdaptiveTrackSelection.DEFAULT_BUFFERED_FRACTION_TO_LIVE_EDGE_FOR_QUALITY_INCREASE,
AdaptiveTrackSelection.DEFAULT_MIN_TIME_BETWEEN_BUFFER_REEVALUTATION_MS,
Clock.DEFAULT);
for (int i = 0; i < tracks.length; i++)
{
Format format = trackGroup.getFormat(tracks[i]);
if (format.width < MIN_WIDTH)
{
Logger.log(this, "Video track blacklisted with width = " + format.width);
adaptiveTrackSelection.blacklist(tracks[i], BLACKLIST_DURATION);
} else
{
Logger.log(this, "Video track NOT blacklisted with width = " + format.width);
}
}
}
}
return adaptiveTrackSelection;
}
}
The above method just blacklist the track that you don't want to select, allowing the player to choose just between those that are not blacklisted.
We have blacklisted tracks according to width parameter, but obviously you can filter them using bitRate.
With this behavior the player will start with the track you allow it to use, and after a period of time (BLACKLIST TIME) it can switch back to use all the tracks in case of need.
If you want to exclude a track for all the time just use Integer.MAX_VALUE as blacklist time.
I hope that this will help who is searching for this feature.

Issue with removing eventlistener in actionscript

I'm not new to flash, but I'm a bit of a noob with actionscript, trying to build an app in flash pro (or rather, animate cc) which will (hopefully) teach the users music theory (how to read music, etc.). What I want is to have different lessons on separate frames, with separate "screens" which the user can swipe through. I'm using multiple copies of the swipe code which adobe provides in their swipe gallery template.
On frame 5, I use the following:
stop()
Multitouch.inputMode = MultitouchInputMode.GESTURE;
var currentGalleryItem:Number = 1;
var totalGalleryItems:Number = 10;
stage.addEventListener (TransformGestureEvent.GESTURE_SWIPE, fl_SwipeToGoToNextPreviousFrameB);
function fl_SwipeToGoToNextPreviousFrameB(event:TransformGestureEvent):void
{
if(event.offsetX == 1)
{
if(currentGalleryItem > 1){
currentGalleryItem--;
slideRight();
}
}
else if(event.offsetX == -1)
{
if(currentGalleryItem < totalGalleryItems){
currentGalleryItem++;
slideLeft();
}
}
}
var slideCounter:Number = 0;
function slideLeft(){
lsn112.addEventListener("enterFrame", moveGalleryLeft);
}
function slideRight(){
lsn112.addEventListener("enterFrame", moveGalleryRight);
}
function moveGalleryLeft(evt:Event){
lsn112.x -= 128;
slideCounter++;
if(slideCounter == 10){
lsn112.removeEventListener("enterFrame", moveGalleryLeft);
slideCounter = 0;
}
}
function moveGalleryRight(evt:Event){
lsn112.x += 128;
slideCounter++;
if(slideCounter == 10){
lsn112.removeEventListener("enterFrame", moveGalleryRight);
slideCounter = 0;
}
}
Home112.addEventListener(MouseEvent.CLICK, fl_ClickToGoToAndStopAtFrame_22);
function fl_ClickToGoToAndStopAtFrame_22(event:MouseEvent):void
{
gotoAndStop(2);
}
stop()
Frame 6 is almost identical, just with different names for variables, functions, etc.:
stop()
Multitouch.inputMode = MultitouchInputMode.GESTURE;
var currentGalleryItemA:Number = 1;
var totalGalleryItemsA:Number = 11;
stage.addEventListener (TransformGestureEvent.GESTURE_SWIPE, fl_SwipeToGoToNextPreviousFrameA);
function fl_SwipeToGoToNextPreviousFrameA(event:TransformGestureEvent):void
{
if(event.offsetX == 1)
{
if(currentGalleryItemA > 1){
currentGalleryItemA--;
slideRightA();
}
}
else if(event.offsetX == -1)
{
if(currentGalleryItemA < totalGalleryItemsA){
currentGalleryItemA++;
slideLeftA();
}
}
}
var slideCounterA:Number = 0;
function slideLeftA(){
lsn113.addEventListener("enterFrame", moveGalleryLeftA);
}
function slideRightA(){
lsn113.addEventListener("enterFrame", moveGalleryRightA);
}
function moveGalleryLeftA(evt:Event){
lsn113.x -= 128;
slideCounterA++;
if(slideCounterA == 10){
lsn113.removeEventListener("enterFrame", moveGalleryLeftA);
slideCounterA = 0;
}
}
function moveGalleryRightA(evt:Event){
lsn113.x += 128;
slideCounterA++;
if(slideCounterA == 10){
lsn113.removeEventListener("enterFrame", moveGalleryRightA);
slideCounterA = 0;
}
}
Home113.addEventListener(MouseEvent.CLICK, fl_ClickToGoToAndStopAtFrame_23);
function fl_ClickToGoToAndStopAtFrame_23(event:MouseEvent):void
{
gotoAndStop(2);
}
stop()
There is also a button as part of the movieclip "lsn112" which is being swiped. Don't know if this is relevant or not, but the code is:
stop();
fwdtest.addEventListener(MouseEvent.CLICK, GoRootNext112);
function GoRootNext112(event:MouseEvent):void
{
MovieClip(root).nextFrame();
}
It works fine to a point, but I think an eventlistener is not being removed properly. When the user swipes through the gallery, it works as expected. They can then move onto the next gallery, which also works as expected. No errors so far. However, if they then go back to the menu, and then back to the gallery, I get an error code 1009:
TypeError: Error #1009: Cannot access a property or method of a null
object reference. at
MusicTheorySwipe_fla::MainTimeline/slideRightA()[MusicTheorySwipe_fla.MainTimeline::frame6:32]
at
MusicTheorySwipe_fla::MainTimeline/fl_SwipeToGoToNextPreviousFrameA()[MusicTheorySwipe_fla.MainTimeline::frame6:16]
at runtime::ContentPlayer/simulationSendGestureEvent() at
runtime::SimulatedContentPlayer/clientSocketDataHandler()
What confuses me is that I am using frame 5 at this point, yet I get an error referencing frame 6. It appears to me that flash is attempting to send a gesture to the eventlistener in frame 6, even though I'm on frame 5, which I'm guessing is down to an eventlistener not being removed. However, being new to code, I don't know when to remove the eventlistener without breaking the code.
Here's a link to a zip containing the relevant .fla, .swf and .xml files.
http://speedy.sh/5JP7c/MusicTheorySwipe.zip
As this is the method I would like to use over many, many frames, I would really appreciate your time and help in resolving this.
EDIT
Ok, I've simplified the code as best I can, to try and eliminate any suspects.
Frame 5:
Multitouch.inputMode = MultitouchInputMode.GESTURE;
stage.addEventListener(TransformGestureEvent.GESTURE_SWIPE , onSwipeA);
var currentGalleryItemA:Number = 1;
var totalGalleryItemsA:Number = 5;
function onSwipeA (e:TransformGestureEvent):void{
//User swiped towards right
if (e.offsetX == 1) {
if(currentGalleryItemA > 1){
currentGalleryItemA--;
lsn113.x += 1280;
}
}
//User swiped towards left
if (e.offsetX == -1) {
if(currentGalleryItemA < totalGalleryItemsA){
currentGalleryItemA++;
lsn113.x -= 1280;
if(currentGalleryItemA == totalGalleryItemsA){
nextFrame()
}
}
}
}
stop();
Frame 6:
stage.removeEventListener(TransformGestureEvent.GESTURE_SWIPE , onSwipeA);
Multitouch.inputMode = MultitouchInputMode.GESTURE;
stage.addEventListener(TransformGestureEvent.GESTURE_SWIPE , onSwipeB);
var currentGalleryItemB:Number = 1;
var totalGalleryItemsB:Number = 11;
function onSwipeB (e:TransformGestureEvent):void{
//User swiped towards right
if (e.offsetX == 1) {
if(currentGalleryItemB > 1){
currentGalleryItemB--;
lsn112.x += 1280;
}
}
//User swiped towards left
if (e.offsetX == -1) {
if(currentGalleryItemB < totalGalleryItemsB){
currentGalleryItemB++;
lsn112.x -= 1280;
}
if(currentGalleryItemB == totalGalleryItemsB){
nextFrame()
}
}
}
stop();
And that's all the actionscript there is now, yet it's still not working. Any ideas?

On frame 2 when you switch to frame 6 check if stage has the event listener fl_SwipeToGoToNextPreviousFrameA() and if so remove it. That should fix your error.

You need to remove the listener at couple of frames.
Write these lines on frame2 after all of your code
stage.removeEventListener (TransformGestureEvent.GESTURE_SWIPE, fl_SwipeToGoToNextPreviousFrameA);
stage.removeEventListener (TransformGestureEvent.GESTURE_SWIPE, fl_SwipeToGoToNextPreviousFrameB);
Write this line on frame5 before you define listener
stage.removeEventListener (TransformGestureEvent.GESTURE_SWIPE, fl_SwipeToGoToNextPreviousFrameA);
Write this line on frame6 before you define listener
stage.removeEventListener (TransformGestureEvent.GESTURE_SWIPE, fl_SwipeToGoToNextPreviousFrameB);
and remove both from any other frame you can jump from frame5 and frame6.

How to close an Android app using UiAutomator?

How can I close an especific Android app using UiAutomator API?
Like when you manually press the Recents button and swipe the app you want to close.

Better way (not device, OS version, UI or orientation specific):
Runtime.getRuntime().exec(new String[] {"am", "force-stop", "pkg.name.of.your.app"});
Tested and working on a Nexus 5X with android 6.0

The best option would be to use getUiDevice.pressRecentApps, this will load up the recent apps for you, then take a screenshot using the uiautomator viewerso you have a view of the xml of the screen that has been loaded. You can then use this xml to select the object you wish to swipe using
UiObject app = new UIObject(new UiSelector().resourceId("The id of the app");
app.swipeLeft(100);
or right
This should be able to close your app. The xml will depend on what style of android you are using and the device.

This is how I kill all android apps at once with uiautomator:
public static void killApps()
{
UiDevice device = UiDevice.getInstance(InstrumentationRegistry.getInstrumentation());
try
{
device.pressHome();
device.pressRecentApps();
// Clear all isn't always visible unless you scroll all apps down
int height = device.getDisplayHeight();
int width = device.getDisplayWidth();
device.swipe(width/2,height/2, width/2, height, 50);
UiObject clear = device.findObject(new UiSelector()
.resourceId("com.android.systemui:id/button")
.text("CLEAR ALL")
);
if (clear.exists())
{
clear.click();
}
}
catch (RemoteException e)
{
e.printStackTrace();
}
catch (UiObjectNotFoundException e)
{
e.printStackTrace();
}
}

Building on the solution from #user597159 I got the following to close all applications on a Pixel 2 for Firebase Test Lab (i.e. the "walleye" device type):
private void killAllApps() throws Exception {
boolean keepSwiping = true;
int maxSwipeAttempts = 10;
uiDevice.pressRecentApps();
for (int swipeAttempt=0; swipeAttempt<maxSwipeAttempts && keepSwiping; swipeAttempt++) {
int height = uiDevice.getDisplayHeight();
int width = uiDevice.getDisplayWidth();
uiDevice.swipe(width / 2, height / 2, width, height / 2, 50);
UiObject clearAll1 = uiDevice.findObject(new UiSelector().text("Clear all"));
UiObject clearAll2 = uiDevice.findObject(new UiSelector().textStartsWith("Clear all"));
UiObject clearAll3 = uiDevice.findObject(new UiSelector().textContains("Clear all"));
UiObject clear = clearAll1.exists() ? clearAll1 :
(clearAll2.exists() ? clearAll2 : clearAll3);
if (clear.exists()) {
Logger.debug(TAG, "Attempting to close app by killAllApps and found clear=all button on swipeAttempt=" + swipeAttempt);
clear.click();
keepSwiping = false;
} else {
Logger.debug(TAG, "Attempting to close app by killAllApps but have to keep swiping swipeAttempt=" + swipeAttempt);
keepSwiping = true;
}
}
}
Note on the Pixel 2, it is spelled "Clear all" not "CLEAR ALL".
I could not get some of the other solutions to work. I got UiObjectNotFoundException for the following:
app = uiDevice.findObject(new UiSelector().textContains("SDK Test App"));
And also for:
app = uiDevice.findObject(new UiSelector().className(com.locuslabs.android.sdk.SdkTestApplication.class));
In other words app.exists() returned false for these approaches that attempted to swipe up on the app to close on Pixel 2.

When it is just one app that will be in the recent app list, this worked for me.
if(mDevice.pressRecentApps()) {
Thread.sleep(1000);
int startX = 300; int startY =835; int endX = 1000; int endY = 835; // co-ordinates refer to x-axis from left of screen to right.
int steps = 8;// speed at which the app closes
mDevice.swipe(startX,startY,endX,endY,steps);
}

Here's a Kotlin answer that is similar to this answer. It adds an extension function to UiDevice to clear all tasks. I tested this on a Pixel 2 emulator.
fun UiDevice.clearAllTasks(swipeAttempts: Int = 10 ) {
pressRecentApps()
var currentAttempt = 1
val centerScreenX = displayWidth / 2
val centerScreenY = displayHeight / 2
while (currentAttempt <= swipeAttempts) {
Timber.d("Clear all tasks attempt $currentAttempt")
swipe(centerScreenX, centerScreenY, displayWidth, centerScreenY, 50)
val uiObject = findObject(UiSelector().text("Clear all"))
if (uiObject.exists()) {
uiObject.click()
break
} else {
currentAttempt++
}
}
}

So I took a little more comprehensive approach to this at it seemed quite unreliable with others answers. I use A LOT of custom extensions so will try to post most of them:
fun UiDevice.clearTasks(swipes: Int = 2) {
logInfo { message("clearTasks swipes:$swipes") }
pressHome()
wait()
pressRecentApps()
wait()
repeat(swipes) {
if (context.isPortrait)
swipe(centerScreenX, centerScreenY, centerScreenX, 50, 10)
else
swipe(centerScreenX, centerScreenY, 25, centerScreenY, 10)
wait()
}
}
fun UiDevice.wait(seconds: Int = defaultWaitTime) {
logInfo { message("wait:$seconds") }
waitForWindowUpdate(null, seconds * SecondLong)
waitForMoreIdle()
}
fun UiDevice.waitForMoreIdle(times: Int = 3) {
logInfo { message("waitForMoreIdle times:$times") }
repeat(times) { waitForIdle() }
}
val UiDevice.centerScreenX get() = displayWidth / 2
val UiDevice.centerScreenY get() = displayHeight / 2
val Context.isPortrait get() = resources.configuration.orientation == ORIENTATION_PORTRAIT
val context: Context get() = ApplicationProvider.getApplicationContext()
Note: I don't really on some text as it depends on language on phone that can be different. Also I like more this custom swipe times approach as I know how much tasks approximately I need to clear out most of the time. There is side effect of showing app launcher but who cares. Didn't find a way to detect it to cancel swiping yet.

[AS3][Air for Android] Get streaming mic input?

Is there a way to get true mic streaming input?
The example code I have at the moment looks to be getting the mic input data, and saving it to a sound object and playing it right away.
Is there a way to stream it properly?
If not, in my example, is there a way to get the mic input data, but mute the audio, as it is causing a feedback loop (despite setLoopBack being set to false..)
Code below:
import flash.display.*;
import flash.events.*;
import flash.media.*;
import flash.media.SoundTransform;
import flash.utils.*;
var _soundBytes:ByteArray = new ByteArray();
var _micBytes:ByteArray;
var son:Sound;
var sc:SoundChannel;
var pow:int = 0;
var myBar:Sprite;
stage.quality = "LOW";
// this code ended up muting the mic input oddly?
//SoundMixer.soundTransform = new SoundTransform(0);
init();
function init()
{
myBar = new Sprite;
micInit();
soundInit();
addEventListener(Event.ENTER_FRAME, visualise);
}
function micInit()
{
var mic:Microphone = Microphone.getMicrophone();
if(mic != null) {
//mic.setUseEchoSuppression(true);
mic.setLoopBack(false);
mic.setSilenceLevel(0);
mic.rate = 44;
mic.gain = 60;
mic.addEventListener(SampleDataEvent.SAMPLE_DATA, micSampleDataHandler);
}
}
function micSampleDataHandler(event:SampleDataEvent):void
{
_micBytes = event.data;
sc = son.play();
}
function soundInit():void {
son = new Sound();
son.addEventListener(SampleDataEvent.SAMPLE_DATA, soundSampleDataHandler);
}
function soundSampleDataHandler(event:SampleDataEvent):void {
for (var i:int = 0; i < 8192 && _micBytes.bytesAvailable > 0; i++) {
var sample:Number = _micBytes.readFloat();
event.data.writeFloat(sample);
event.data.writeFloat(sample);
}
}
function drawLines(e:Event):void{
SoundMixer.computeSpectrum(_soundBytes, true);
myBar.graphics.clear();
myBar.graphics.lineStyle(2,0xabc241);
for (var i=0; i < 256; i++) {
pow = _soundBytes.readFloat()*200;
pow = Math.abs(pow);
myBar.graphics.drawRect(i*2, 0, 2, pow);
addChild(myBar);
}
}
Hope you can help!

To use acoustic echo cancellation, call Microphone.getEnhancedMicrophone() to get a reference to an enhanced Microphone object. Set the Microphone.enhancedOptions property to an instance of the MicrophoneEnhancedOptions class. Here is an article that discusses it all. Article about enhanced microphone options at Adobe
EDIT: I spoke too soon. I have used enhanced mic many times before, but I decided to read the article myself to see if there were any interesting things I could learn new from it... and I found this near the end
AEC is computationally expensive. Currently, only desktop platforms are supported for Flash Player and AIR
Although I just looked at the date... last year, so maybe give it a try and it is supported now?!?

android emulator restarts itself (ADT)

When i invoke a function which is described below, android emulator restarts from beginning.
The function is like that
int index = 0;
Position myPostion;
Position destPosition = roadInstruction.getInstructionAt(index).getEndAddr();
while(index<roadInstruction.getNumInstruction())
{
myPostion = getMyPosition();
while(!hasArrivedToDestination(myPostion, destPosition ))
{
myPostion = getMyPosition();
}
++index;
}
What is the reason?
It maybe because of the inner while loop, but i am not sure.