I'm following this tutorial.Right now, I'm trying to loop the fingerprint authentication part so that I can keep reauthenticate user fingerprint. I've tried to use thread in onStart() and onCreate() to while loop the authentication but the app is stuck in both cases.
Original code that can authenticate only one time
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
fingerprintManager = (FingerprintManager) getSystemService(FINGERPRINT_SERVICE);
keyguardManager = (KeyguardManager) getSystemService(KEYGUARD_SERVICE);
if (!keyguardManager.isKeyguardSecure()){
Toast.makeText(this,
"Lock screen security is not enable in Settings", Toast.LENGTH_LONG).show();
return;
}
if (ActivityCompat.checkSelfPermission(this,
Manifest.permission.USE_FINGERPRINT) != PackageManager.PERMISSION_GRANTED){
Toast.makeText(this,
"Fingerprint authentication permission is not enabled", Toast.LENGTH_LONG).show();
return;
}
if (!fingerprintManager.hasEnrolledFingerprints()){
Toast.makeText(this, "Register at least one fingerprint in Settings", Toast.LENGTH_LONG).show();
return;
}
generateKey();
if (cipherInit()){
cryptoObject = new FingerprintManager.CryptoObject(cipher);
FingerprintHandler helper = new FingerprintHandler(this);
helper.startAuth(fingerprintManager, cryptoObject);
}
}
Thread in onStart() / onCreate() that failed
#Override
protected void onStart() {
super.onStart();
new Thread(new Runnable(){
public void run() {
while(true)
{
try {
Thread.sleep(50);
if (cipherInit()) {
cryptoObject = new FingerprintManager.CryptoObject(cipher);
FingerprintHandler helper = new FingerprintHandler(MainActivity.this);
helper.startAuth(fingerprintManager, cryptoObject);
}} catch (InterruptedException e){
e.printStackTrace();
}
}
}
}).start();}
Other than using thread, I also tried to use AsyncTask to do the while loop for me. This is my attempt in creating the class. My problem is that the cipherInit() resides in MainActivity.java and how can I invoke the method from my Looping class?
Looping.java
import android.hardware.fingerprint.FingerprintManager;
import android.os.AsyncTask;
public class Looping extends AsyncTask<Object,Void,Void> {
FingerprintManager fingerprintManager;
FingerprintManager.CryptoObject cryptoObject;
Cipher cipher;
#Override
protected Void doInBackground(Void... arg0) {
cipher = (Cipher) arg0[0];
while(true) {
if (cipherInit()) {
cryptoObject = new FingerprintManager.CryptoObject(cipher);
FingerprintHandler helper = new FingerprintHandler(MainActivity.this);
helper.startAuth(fingerprintManager, cryptoObject);
}
}
}}
MainActivity
Looping loop = new Looping();
loop.execute(cipher, null, null);
This is my first personal project and I'm still relatively new with the whole Android structure. I'll really appreciate any input from you all. Thanks in advance
You should not need the secondary thread or loop to do the authentication. The call to FingerprintManager.authenticate() is done in your FingerprintHandler (assuming you have the same code as the tutorial you cited). This is an asyc operation and the handler (FingerprintManager.AuthentciationCallback) is called back when the auth succeeds or fails. You need to take action based on that success/failure rather than poll in a while loop. That callback will occur on your main thread.
Related
From the Flutter side, using the PlatformChannel, I am navigating to an Android Java activity, and doing some processes.
The activity successfully opens and I'm able to do the functionality and have the final result of it.
How may I navigate back to the Flutter side to a specific page and pass a value?
P.S.: without going back to the same page and then redirecting to the
next page.
On the Flutter side:
I have these variables
/// Filters Method Channel
final filtersChannel = const MethodChannel('flutter.native/filters');
/// Filters Method Channel
final filtersResultChannel = const MethodChannel("flutter.native/result_filters");
I have a floatingActionButton with this function which invokes a MethodChannel
Future<void> startNewActivity() async {
try {
await filtersChannel.invokeMethod('open_filters');
} on PlatformException catch (e) {
debugPrint("Failed to Invoke: '${e.message}'.");
}
}
On the MainActivity.java
On the protected void onCreate(#Nullable Bundle savedInstanceState) function, I'm starting an activity which has the AR video recording like this:
#Override
protected void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Intent intent = new Intent(this, FiltersActivity.class);
startActivity(intent);
}
On the FiltersActivity.java
On the public void configureFlutterEngine(#NonNull FlutterEngine flutterEngine) function
I’m defining and invoking my two channels:
The flutter.native/result_filters channel which builds the UI and
the functionality.
The flutter.native/filters channel which returns the final result.
Here:
#Override
public void configureFlutterEngine(#NonNull FlutterEngine flutterEngine) {
GeneratedPluginRegistrant.registerWith(flutterEngine);
String resultFiltersChannelIdentifier = "flutter.native/result_filters";
filtersResultChannel = new MethodChannel(flutterEngine.getDartExecutor().getBinaryMessenger(), resultFiltersChannelIdentifier);
String filtersChannelIdentifier = "flutter.native/filters";
MethodChannel filtersChannel = new MethodChannel(flutterEngine.getDartExecutor().getBinaryMessenger(), filtersChannelIdentifier);
filtersChannel.setMethodCallHandler(this::filtersMethodCallHandler);
}
Then, the flutter.native/filters displays the UI using the filtersMethodCallHandler function. Here:
private void filtersMethodCallHandler(MethodCall methodCall, MethodChannel.Result result) {
if (methodCall.method.equals("open_filters")) {
openUI();
} else {
result.notImplemented();
}
}
In the openUI function, I'm assigning the record button a function, here:
recordButton.setOnClickListener(this::toggleRecording);
And here's the toggleRecording function:
public void toggleRecording(View unusedView) {
boolean recording = videoRecorder.onToggleRecord();
if (recording) {
recordButton.setImageResource(R.drawable.round_stop);
Toast.makeText(this, "Started Recording", Toast.LENGTH_SHORT).show();
} else {
recordButton.setImageResource(R.drawable.round_videocam);
Toast.makeText(this, "Recording Stopped", Toast.LENGTH_SHORT).show();
videoPath = videoRecorder.getVideoPath().getAbsolutePath();
Toast.makeText(this, "Video saved: " + videoPath, Toast.LENGTH_SHORT).show();
Log.d(TAG, "Video saved: " + videoPath);
// Send notification of updated content.
ContentValues values = new ContentValues();
values.put(MediaStore.Video.Media.TITLE, "Sceneform Video");
values.put(MediaStore.Video.Media.MIME_TYPE, "video/mp4");
values.put(MediaStore.Video.Media.DATA, videoPath);
getContentResolver().insert(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, values);
filtersResultChannel.invokeMethod("filters_result", videoPath);
finish();
}
}
As shown above, I'm invoking the filters_result method for the filtersResultChannel channel and I'm adding the videoPath to it.
And then, I'm calling the finish(); method to close the FiltersActivity and return back to the MainAvtivity which successfully returns me to the Flutter page!
BACK to the Flutter side,
I'm listening to the filtersResultChannel like this:
#override
void initState() {
super.initState();
filtersResultChannel.setMethodCallHandler(_filtersResultHandler);
}
Future _filtersResultHandler(MethodCall methodCall) async {
if (methodCall.method == "filters_result") {
final videoPath = methodCall.arguments;
if (videoPath != null && videoPath.length >= 0) {
SchedulerBinding.instance.addPostFrameCallback((_) {
debugPrint("YES YES YES => $videoPath");
setState(() {
reportStatus = videoPath;
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => VideoShow(clipPath: videoPath),
),
);
});
});
}
return null;
} else {
return null;
}
}
As shown above, I have a debugPrint statement, this statement prints the returned videoPath from the filtersResultChannel
<--------->
THE PROBLEM
<--------->
Even though I'm successfully getting the videoPath value and successfully returning back to the Flutter page, I'm NOT able to use it!!
The setState(); doesn't update the UI NOR navigate to the next screen, the VideoShow screen!
HOW MAY I FIX SUCH AN ISSUE?
I am using Job Scheduler API in my app to schedule a job for me after specific time interval. It runs fine when the app is running. But whenever the user closes the app or clears it from the recent task list the app stops and the scheduled job never executes afterwards until you open the app and it is rescheduled again from the time it is opened.
Now i want someone to help me to keep the jobs on executing even if the app is closed or cleared from the recent task list.
If there is any alternative solution please tell me.
i am looking for the solution from the past 3 days. Tried everything said by developers on StackOverFlow and other sites and none of them worked for me.
This is where is schedule the job!
ComponentName componentName = new
ComponentName(getActivity().getBaseContext(),WallpaperJobService.class);
JobInfo jobInfo = new JobInfo.Builder(777,componentName)
.setRequiresCharging(sharedPreferences.getBoolean("Charging",false))
.setRequiredNetworkType(sharedPreferences.getBoolean("Wifi",false) ?
JobInfo.NETWORK_TYPE_UNMETERED : JobInfo.NETWORK_TYPE_ANY)
.setPeriodic(sharedPreferences.getInt("Duration",15) * 60 *
1000)
.setPersisted(true)
.build();
JobScheduler scheduler = (JobScheduler)
getContext().getSystemService(Context.JOB_SCHEDULER_SERVICE);
scheduler.schedule(jobInfo);
My Job Service Class:
public class WallpaperJobService extends JobService {
private boolean jobCancelled;
private SharedPreferences sharedPreferences;
private SharedPreferences.Editor editor;
#Override
public boolean onStartJob(JobParameters params) {
Log.i("WallpaperJobService", "Job started!");
changeWallpaper(params);
return true;
}
private void changeWallpaper(final JobParameters params) {
final ArrayList<Image> images = (ArrayList<Image>)
MainActivity.favoritesRoomDatabase.roomDao().getAllFavoriteWallpapers();
sharedPreferences = getSharedPreferences("GridSize", MODE_PRIVATE);
editor = sharedPreferences.edit();
if (images != null && images.size() != 0) {
if (sharedPreferences.getInt("Index", 0) == images.size()) {
editor.putInt("Index", 0);
editor.commit();
}
Picasso.get().load(Constants.domain +
images.get(sharedPreferences.getInt("Index", 0)).getImage_url()).into(new
Target() {
#Override
public void onBitmapLoaded(final Bitmap bitmap,
Picasso.LoadedFrom from) {
new Thread(new Runnable() {
#Override
public void run() {
if (jobCancelled) {
Log.i("WallpaperJobService","Returned");
return;
}
try {
//Doing some work here
} catch (IOException e) {
e.printStackTrace();
}
Log.i("WallpaperJobService", "Job finished!");
jobFinished(params, false);
}
}).start();
}
#Override
public void onBitmapFailed(Exception e, Drawable errorDrawable)
{
Log.i("WallpaperJobService", "Bitmap load failed " +
e.getMessage());
}
#Override
public void onPrepareLoad(Drawable placeHolderDrawable) {
}
});
} else {
Log.i("WallpaperJobService", "Favorite database is null!");
}
}
#Override
public boolean onStopJob(JobParameters params) {
Log.i("WallpaperJobService", "Job cancelled before completion!");
jobCancelled = true;
return true;
}
}
When doing stuff periodically in the background — JobScheduler, WorkManager, AlarmManager, FCM push messages, etc. — you have to take into account that your process might not be around when it is time for you to do your work. Android will fork a process for you, but it is "starting from scratch". Anything that your UI might have set up in memory, such as a database, would have been for some prior process and might not be set up in the new process.
Hello There I am a newbie for Android Development, working to learn it to my own!
I just want to update my notification in a Java Thread in my application (I am just learning and curious about how can I do it).
I have an activity, a simple thread to increment an Integer value. Then, I just want to show it in my Notification whenever the Integer value increments!
My Code is as:
public class MainActivity extends Activity{
private final String LOG_KEY = this.getClass().getSimpleName();
private int c = 0;
private boolean flag = true;
private NotificationCompat.Builder builder;
private NotificationManager notificationManager;
#Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
builder = new NotificationCompat.Builder(MainActivity.this)
.setSmallIcon(R.mipmap.ic_launcher)
.setAutoCancel(false);
builder.setOngoing(true);
notificationManager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
Thread t = new Thread(new MyThread());
t.start();
}//OnCreate ends
#Override
protected void onStop() {
super.onStop();
flag = false;
}//stop ends
#Override
protected void onDestroy() {
super.onDestroy();
flag = false;
}//destroy ends
private class MyThread implements Runnable {
#Override
public void run() {
while (flag) {
c+=1;
showNotification(Integer.toString(c) + " Counts");
}//while ends
}//run ends
private void showNotification(String msg) {
try {
//set the notification
builder.setContentText(msg);
notificationManager.notify(0, builder.build());
} catch (Exception exp) {
Log.e("xmn", exp.toString());
}//try catch ends
}//showNotification ends
}//private class ends
}//MainActivity class ends here
As from my code, the notification appears and updates the value! But the problem is that it freezes the device and application at a sudden!
I just want help for what I am doing wrong as I am a newbie and learning it to my own. Any help and idea will be highly appreciated!
Thanks
You shouldn't be creating a notification and then continuously updating it as fast as you can from a thread. It's really not designed for that.
The closest thing I can think of that would meet your use case is using a notification to display progress. See this link:
Displaying Progress in a Notification
You might want to put some kind a rate limiter in your thread, unless you want your count to reach very high numbers very quickly. Perhaps make the thread sleep for a second between updates.
The problem is that you produce too much notifications more then a device can consume.
For your goal (just learn) you can add a some pause between notifications like that:
private void showNotification(String msg) {
try {
//set the notification
Thread.sleep(1000); //set the pause
builder.setContentText(msg);
notificationManager.notify(0, builder.build());
} catch (Exception exp) {
Log.e("xmn", exp.toString());
}//try catch ends
}//showNotification ends
I cant get a progress dialog to show when I need it to. I have tried putting it in my asyncTask the ui class and the its own thread that runs on the ui and none have worked. Can anyone help me?
the method where the progressDialog method is called:
public void shareTest(View view){ //method called to jump to share activity if criteria matched
if(checkInputs()) { //call to check inputs
Share start = new Share();
boolean isConnected=start.connectToServer(); //connectToServer
Intent intent = new Intent(HomeScreen.this, Share.class); //create intent to move to share class from this activity
startProgressDialog();
if (isConnected) { //check to see if isconnected was succesful
if (Share.matchFound ){ //check to see if a match was found
progress.dismiss();
startActivity(intent); //if true jump to share activity
} else {
while (!Share.timedOut) { //While the time has not timedOut
if (Share.matchFound) { //if a share has been found
startActivity(intent); //start share activity
break; //if true then break
}
}
if (Share.timedOut) {
//send an notice that a match wasn't found
sendToast(getString(R.string.noShare)); //if not true then send Toast
}
}
}
else sendToast(getString(R.string.errServCon)); //if connection to server failed then send toast
}
}
this is the method:
void startProgressDialog() {
new Thread(new Runnable() {
#Override
public void run() { //creates a new runnable thread
// Issue command() on a separate thread
while (!Share.matchFound) { //while havent been asked to disconnect //if a new location has been recieved
activity.runOnUiThread(new Runnable() {
#Override
public void run() { //run on the ui thread act
progress.show(); //call the method that does the update
}
});
}
progress.dismiss();
}
}).start();
}
Declare a global variable like this:
ProgressDialog progress;
Wherever you want to show the progress, paste this code:
progress = ProgressDialog.show(this, "Please wait",
"Loading..", true);
When you are done, simply dismiss it:
progress.dismiss();
I am trying to start a dream service. Currently, this is my code:
#SuppressLint("NewApi")
public class DreamLockService extends DreamService {
private static final String TAG = "DreamLockService";
public Utility utilObj = new Utility();
//private Button btnExit;
private Button btnlogin;
private EditText lgPass;
#Override
public void onAttachedToWindow() {
super.onAttachedToWindow();
// Exit dream upon user touch
setInteractive(true);
// Hide system UI
setFullscreen(true);
// Set the dream layout
setContentView(R.layout.lockservice);
//setClickListener();
Toast.makeText(this, "Lock Service Created", Toast.LENGTH_LONG).show();
}
//Use this for initial setup, such as calling setContentView().
#Override
public void onDreamingStarted() {
super.onDreamingStarted();
// Exit dream upon user touch
setInteractive(true);
// Hide system UI
setFullscreen(true);
// Set the dream layout
setContentView(R.layout.lockservice);
Toast.makeText(this, "Lock Service Created", Toast.LENGTH_LONG).show();
}
//Your dream has started, so you should begin animations or other behaviors here.
public void onDreamingStopped()
{
super.onDreamingStopped();
}
//Use this to stop the things you started in onDreamingStarted().
public void onDetachedFromWindow()
{
super.onDetachedFromWindow();
}
}
I was unable to start the dream service from another activity. This is what I used:
Intent tempLock = new Intent(MainActivity.this, DreamLockService.class);
//DreamLockService test = new DreamLockService();
startService(tempLock);
I don't understand why it didn't work. How can a dream service be started from another activity?
To start a Dream service from our own app, please try this.
IBinder binder = ServiceManager.getService("dreams");
Parcel data = Parcel.obtain();
data.writeInterfaceToken("android.service.dreams.IDreamManager");
Parcel reply = Parcel.obtain();
try {
if (binder != null)
binder.transact(1, data,reply, Binder.FLAG_ONEWAY);
else
Log.e("TAG", "dreams service is not running");
} catch (RemoteException e) {
e.printStackTrace();
}
To use this, your app should be system app and should have dream permissions in the Manifest file and enable dream setting in Settings.
I tried this and it is working.
You can start the currently selected screen saver using this code:
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.setClassName("com.android.systemui", "com.android.systemui.Somnambulator");
intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
startActivity(intent);
Just need to make sure that your dream service is set and enabled.
Did you include it in your manifest and have an <intent-filter> that matches your action?
If it's ok, then try with:
startService(new Intent(this, DreamLockService.class));
An excellent Services tutorial: http://www.vogella.com/articles/AndroidServices/article.html#scheduleservice_startauto
UPDATE:
As it seems you are not sure if your service is running, you can use this solution found here:
private boolean isMyServiceRunning() {
ActivityManager manager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
for (RunningServiceInfo service : manager.getRunningServices(Integer.MAX_VALUE)) {
if (MyService.class.getName().equals(service.service.getClassName())) {
return true;
}
}
return false;
}