Develop Reference

app crashes when changing the font style of the device

I am facing a issue in Samsung mobile, the issue is this, i open the application that i have made and minimized the app now the app is running at the background, now i go to my mobile
settings-->Display--> font style,
Then i changed the font when i come back and open the app that was running at the back ground the app crashes
I do not know where the issue is can you please give some idea on how to move about
This was the error that i was able to see in my logcat
2-12 17:58:54.883 1473-1473/com.mysmcc E/AndroidRuntime: FATAL EXCEPTION: main Process: com.mysmcc, PID: 1473 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mysmcc/com.mysmcc.activities.AppMainActivity}: java.lang.StringIndexOutOfBoundsException: length=0; index=0 at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2695) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2769) at android.app.ActivityThread.access$900(ActivityThread.java:177) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1430) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5910) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1405) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1200) Caused by: java.lang.StringIndexOutOfBoundsException: length=0; index=0 at java.lang.String.indexAndLength(String.java:500) at java.lang.String.charAt(String.java:494) at android.graphics.Color.parseColor(Color.java:209) at com.mysmcc.activities.AppMainActivity.onCreate(AppMainActivity.java:213) at android.app.Activity.performCreate(Activity.java:6178) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2648) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2769) at android.app.ActivityThread.access$900(ActivityThread.java:177) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1430) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5910) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1405) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1200)

When I import Google`s UniversalMusicPlayer to my android studio, it crashed

I am a newcomer who want to learn android.My friend suggested me to read the code of that player,but when I imported the project and compiled it,it crashed...
12-22 20:58:07.755 4870-4870/com.example.android.uamp
E/AndroidRuntime: FATAL EXCEPTION: main Process:
com.example.android.uamp, PID: 4870 java.lang.RuntimeException: Unable
to start activity
ComponentInfo{com.example.android.uamp/com.example.android.uamp.ui.MusicPlayerActivity}:
java.lang.RuntimeException: com.google.android.gms.internal.zzsb$zza:
No acceptable module found. Local version is 0 and remote version is
0. at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2448)
at
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2510)
at android.app.ActivityThread.access$1200(ActivityThread.java:163) at
android.app.ActivityThread$H.handleMessage(ActivityThread.java:1371)
at android.os.Handler.dispatchMessage(Handler.java:102) at
android.os.Looper.loop(Looper.java:135) at
android.app.ActivityThread.main(ActivityThread.java:5595) at
java.lang.reflect.Method.invoke(Native Method) at
java.lang.reflect.Method.invoke(Method.java:372) at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:960)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755) Caused
by: java.lang.RuntimeException:
com.google.android.gms.internal.zzsb$zza: No acceptable module found.
Local version is 0 and remote version is 0. at
com.google.android.gms.internal.zzni.zzbg(Unknown Source) at
com.google.android.gms.internal.zzni.zza(Unknown Source) at
com.google.android.gms.cast.framework.CastContext.(Unknown
Source) at
com.google.android.gms.cast.framework.CastContext.getSharedInstance(Unknown
Source) at
com.example.android.uamp.ui.ActionBarCastActivity.onCreate(ActionBarCastActivity.java:141)
at
com.example.android.uamp.ui.BaseActivity.onCreate(BaseActivity.java:49)
at
com.example.android.uamp.ui.MusicPlayerActivity.onCreate(MusicPlayerActivity.java:57)
at android.app.Activity.performCreate(Activity.java:6100) at
android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1109)
at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2401)
at
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2510)
at android.app.ActivityThread.access$1200(ActivityThread.java:163) at
android.app.ActivityThread$H.handleMessage(ActivityThread.java:1371)
at android.os.Handler.dispatchMessage(Handler.java:102) at
android.os.Looper.loop(Looper.java:135) at
android.app.ActivityThread.main(ActivityThread.java:5595) at
java.lang.reflect.Method.invoke(Native Method) at
java.lang.reflect.Method.invoke(Method.java:372) at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:960)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
Caused by: com.google.android.gms.internal.zzsb$zza: No acceptable
module found. Local version is 0 and remote version is 0. at
com.google.android.gms.internal.zzsb.zza(Unknown Source) at
com.google.android.gms.internal.zzni.zzbg(Unknown Source) at
com.google.android.gms.internal.zzni.zza(Unknown Source) at
com.google.android.gms.cast.framework.CastContext.(Unknown
Source) at
com.google.android.gms.cast.framework.CastContext.getSharedInstance(Unknown
Source) at
com.example.android.uamp.ui.ActionBarCastActivity.onCreate(ActionBarCastActivity.java:141)
at
com.example.android.uamp.ui.BaseActivity.onCreate(BaseActivity.java:49)
at
com.example.android.uamp.ui.MusicPlayerActivity.onCreate(MusicPlayerActivity.java:57)
at android.app.Activity.performCreate(Activity.java:6100) at
android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1109)
at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2401)
at
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2510)
at android.app.ActivityThread.access$1200(ActivityThread.java:163) at
android.app.ActivityThread$H.handleMessage(ActivityThread.java:1371)
at android.os.Handler.dispatchMessage(Handler.java:102) at
android.os.Looper.loop(Looper.java:135) at
android.app.ActivityThread.main(ActivityThread.java:5595) at
java.lang.reflect.Method.invoke(Native Method) at
java.lang.reflect.Method.invoke(Method.java:372) at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:960)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
Well,when I searched for answers,the responses were not useful...
And if you have some wonderful open source project to recommend ,hope you can tell me.Thx.
Sorry for my poor english...

You need to update your google play service of device.
You can see this Bug report which already has been addressed
and possibility you will have to update your gcm dependency then appropriate modifications of code will also required mean the deprecated methods will be needed to replaced with new one in the project for e.g GoogleApiAvailability to register token etc so also make sure you are using the latest gcm dependency in your project

Android - Permission Denial (scanLibrary?!)

I am trying to develop a simple app that scan documents. I am using scanlibrary, provided by jhansireddy (https://github.com/jhansireddy/AndroidScannerDemo). I've integrated the library with my actual project, i had done the gradle build.
When I start the activity, i have the options to select a photo from Gallery, or to take a brand new one. In both case, it crashes when it comes to save in the internal memory (requires android.permission.WRITE_EXTERNAL_STORAGE).
Below I will paste the entire error from logcat.
09-09 10:40:51.219 27738-27738/com.example.cosmin.kdocscanner E/MediaStore: Failed to insert image
java.lang.SecurityException: Permission Denial: writing com.android.providers.media.MediaProvider uri content://media/external/images/media from pid=27738, uid=10158 requires android.permission.WRITE_EXTERNAL_STORAGE, or grantUriPermission()
at android.os.Parcel.readException(Parcel.java:1599)
at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:183)
at android.database.DatabaseUtils.readExceptionFromParcel(DatabaseUtils.java:135)
at android.content.ContentProviderProxy.insert(ContentProviderNative.java:476)
at android.content.ContentResolver.insert(ContentResolver.java:1251)
at android.provider.MediaStore$Images$Media.insertImage(MediaStore.java:971)
at com.scanlibrary.Utils.getUri(Utils.java:23)
at com.scanlibrary.PickImageFragment.postImagePick(PickImageFragment.java:146)
at com.scanlibrary.PickImageFragment.onActivityResult(PickImageFragment.java:141)
at android.app.Activity.dispatchActivityResult(Activity.java:6487)
at android.app.ActivityThread.deliverResults(ActivityThread.java:3738)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:3785)
at android.app.ActivityThread.access$1400(ActivityThread.java:157)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1405)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5525)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:730)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:620)
And after this one, another one that I think is a side effect. Meaning that at the point I resolve the first one, it will resolve the other too.
09-09 10:40:51.220 27738-27738/com.example.cosmin.kdocscanner E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.cosmin.kdocscanner, PID: 27738
java.lang.RuntimeException: Failure delivering result ResultInfo{who=android:fragment:0, request=2, result=-1, data=null} to activity {com.example.cosmin.kdocscanner/com.scanlibrary.ScanActivity}: java.lang.NullPointerException: uriString
at android.app.ActivityThread.deliverResults(ActivityThread.java:3742)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:3785)
at android.app.ActivityThread.access$1400(ActivityThread.java:157)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1405)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5525)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:730)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:620)
Caused by: java.lang.NullPointerException: uriString
at android.net.Uri$StringUri.<init>(Uri.java:475)
at android.net.Uri$StringUri.<init>(Uri.java:465)
at android.net.Uri.parse(Uri.java:437)
at com.scanlibrary.Utils.getUri(Utils.java:24)
at com.scanlibrary.PickImageFragment.postImagePick(PickImageFragment.java:146)
at com.scanlibrary.PickImageFragment.onActivityResult(PickImageFragment.java:141)
at android.app.Activity.dispatchActivityResult(Activity.java:6487)
at android.app.ActivityThread.deliverResults(ActivityThread.java:3738)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:3785)
at android.app.ActivityThread.access$1400(ActivityThread.java:157)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1405)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5525)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:730)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:620)
I must say that android manifest has already the permission. In fact, both manifest files (The one that belongs to my project, and the one that belongs to the library).
What can be the cause?!

Strange error on first startup Backendless

I'm trying to run my app with Backendless for the first time. I recieve this error:
java.lang.NoClassDefFoundError: Failed resolution of: Lcom/backendless/BackendlessCollection;
at com.backendless.Persistence.<init>(Persistence.java:72)
at com.backendless.Persistence.<clinit>(Persistence.java:62)
at com.backendless.Persistence.getInstance(Persistence.java:66)
at com.backendless.Backendless.<clinit>(Backendless.java:43)
at com.asd.asd.android.AndroidLauncher.onCreate(AndroidLauncher.java:89)
at android.app.Activity.performCreate(Activity.java:6289)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2646)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2758)
at android.app.ActivityThread.access$900(ActivityThread.java:177)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1448)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:5942)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1400)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1195)
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.backendless.BackendlessCollection" on path: DexPathList[[zip file "/data/app/com.asd.asd.android-1/base.apk"],nativeLibraryDirectories=[/data/app/com.asd.asd.android-1/lib/arm, /vendor/lib, /system/lib]]
The stacktrace gives me no clue on what may be wrong since I don't even use the BackendlessCollection class.
The error points at:
Backendless.initApp(this,app_ID,android_ID, version_id);

That is a known issue in Backendless, it has been fixed in their newer SDK. Here`s link on maven central http://mvnrepository.com/artifact/com.backendless/backendless/3.0.8.1

UnsatisfiedLinkError when opening app in the emulator

I keep getting this error whenever I open my app in the emulator:
05-06 18:52:13.640 2861-2861/? E/AndroidRuntime﹕ FATAL EXCEPTION:
main
Process: scan.test, PID: 2861
java.lang.UnsatisfiedLinkError: dalvik.system.PathClassLoader[DexPathList[[zip file
"/data/app/scan.test-2/base.apk"],nativeLibraryDirectories=[/vendor/lib,
/system/lib]]] couldn't find "libtiny-tools.so"
at java.lang.Runtime.loadLibrary(Runtime.java:366)
at java.lang.System.loadLibrary(System.java:988)
at android.hardware.barcode.Scanner.(Scanner.java:136)
at scan.test.scan_v1activity.onStart(scan_v1activity.java:97)
at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1236)
at android.app.Activity.performStart(Activity.java:6006)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2288)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2390)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5257)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)

I am not sure this is the exact solution but I had same issue, this is solved my issue You are missing libtiny-tools.so file in armeabi folder in libs.
if you are using android studio
add like above picture indicates.