I am building my first Java application. Its functionality includes taking camera images and saving them along with saving 'Project' information locally for said images to be associated with.
I believe I need to include the FileProvider to my code:
<provider
android:name="android.support.v4.content.FileProvider"
android:authorities="devkit.blade.vuzix.com.blade_template_app"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="#xml/provider_path"></meta-data>
</provider>
In the above XML .FileProvider is not resolving and so I cant build the app. What's the problem here?
Also for context #xml/provider_path references this file:
<?xml version="1.0" encoding="utf-8"?>
<paths>
<external-path name="/storage/emulated/0" path="."/>
</paths>
I believe I need to include the FileProvider to my code
In your <provider> element in your manifest, try changing android.support.v4.content.FileProvider (the fully-qualified class name to an old edition of FileProvider) to androidx.core.content.FileProvider.
Adding this to my build.grade (app module) allowed it to be referenced correctly. If you are required to use API level 27 (pre androidX) this is the way!
implementation 'com.android.support:support-core-utils:27.0.0'
I have an android application that uses Retrofit to make http requests (POST) and further evaluate incoming data.
I have the app working absolutely fine in my test phone (Samsung J5 P), it connects and sends requests as it should. But on trying operating the app simultaneously on two different phones, the app on the other phone somehow fails to send requests (retrofit calls onFailure method when a connection fails). I have enabled all permissions, yet the problem seems to happen.
Also, I have hosted the server on my desktop (localhost), and I made sure both my devices are connected to same network.
What could be causing this problem? Thanks.
Starting with Android 9 (API level 28), cleartext support is disabled by default.
Also have a look at - https://koz.io/android-m-and-the-war-on-cleartext-traffic/
Codelabs explanation - https://codelabs.developers.google.com/codelabs/android-network-security-config/index.html
Option 1 -
First try hitting the URL with "https://" instead of "http://"
Option 2 -
Create file res/xml/network_security_config.xml -
<?xml version="1.0" encoding="utf-8"?>
<network-security-config>
<domain-config cleartextTrafficPermitted="true">
<domain includeSubdomains="true">api.example.com(to be adjusted)</domain>
</domain-config>
</network-security-config>
AndroidManifest.xml -
<?xml version="1.0" encoding="utf-8"?>
<manifest ...>
<uses-permission android:name="android.permission.INTERNET" />
<application
...
android:networkSecurityConfig="#xml/network_security_config"
...>
...
</application>
</manifest>
Option 3 -
android:usesCleartextTraffic Doc
AndroidManifest.xml -
<?xml version="1.0" encoding="utf-8"?>
<manifest ...>
<uses-permission android:name="android.permission.INTERNET" />
<application
...
android:usesCleartextTraffic="true"
...>
...
</application>
</manifest>
android:targetSandboxVersion can be a problem too -
According to Manifest Docs -
android:targetSandboxVersion
The target sandbox for this app to use. The higher the sandbox version number, the higher the level of security. Its default value is 1; you can also set it to 2. Setting this attribute to 2 switches the app to a different SELinux sandbox. The following restrictions apply to a level 2 sandbox:
The default value of usesCleartextTraffic in the Network Security Config is false.
Uid sharing is not permitted.
So Option 4 -
If you have android:targetSandboxVersion in <manifest> then reduce it to 1
AndroidManifest.xml -
<?xml version="1.0" encoding="utf-8"?>
<manifest android:targetSandboxVersion="1">
<uses-permission android:name="android.permission.INTERNET" />
...
</manifest>
Create a network config file in res/xml directory
<?xml version="1.0" encoding="utf-8"?>
<network-security-config>
<domain-config cleartextTrafficPermitted="true">
<domain includeSubdomains="true">YOUR_IP</domain>
</domain-config>
</network-security-config>
and then add android:networkSecurityConfig="#xml/network_security_config" in your manifest's application tag
10-22 15:29:40.897: E/AndroidRuntime(2561): FATAL EXCEPTION: main
10-22 15:29:40.897: E/AndroidRuntime(2561): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.gvg.simid/com.gvg.simid.Login}: java.lang.ClassNotFoundException: Didn't find class "com.gvg.simid.Login" on path: DexPathList[[zip file "/data/app/com.gvg.simid-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.gvg.simid-1, /vendor/lib, /system/lib]]
10-22 15:29:40.897: E/AndroidRuntime(2561): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2137)
10-22 15:29:40.897: E/AndroidRuntime(2561): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
10-22 15:29:40.897: E/AndroidRuntime(2561): at android.app.ActivityThread.access$600(ActivityThread.java:141)
10-22 15:29:40.897: E/AndroidRuntime(2561): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
10-22 15:29:40.897: E/AndroidRuntime(2561): at android.os.Handler.dispatchMessage(Handler.java:99)
10-22 15:29:40.897: E/AndroidRuntime(2561): at android.os.Looper.loop(Looper.java:137)
10-22 15:29:40.897: E/AndroidRuntime(2561): at android.app.ActivityThread.main(ActivityThread.java:5103)
10-22 15:29:40.897: E/AndroidRuntime(2561): at java.lang.reflect.Method.invokeNative(Native Method)
10-22 15:29:40.897: E/AndroidRuntime(2561): at java.lang.reflect.Method.invoke(Method.java:525)
10-22 15:29:40.897: E/AndroidRuntime(2561): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
10-22 15:29:40.897: E/AndroidRuntime(2561): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
10-22 15:29:40.897: E/AndroidRuntime(2561): at dalvik.system.NativeStart.main(Native Method)
10-22 15:29:40.897: E/AndroidRuntime(2561): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.gvg.simid.Login" on path: DexPathList[[zip file "/data/app/com.gvg.simid-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.gvg.simid-1, /vendor/lib, /system/lib]]
10-22 15:29:40.897: E/AndroidRuntime(2561): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:53)
10-22 15:29:40.897: E/AndroidRuntime(2561): at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
10-22 15:29:40.897: E/AndroidRuntime(2561): at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
10-22 15:29:40.897: E/AndroidRuntime(2561): at android.app.Instrumentation.newActivity(Instrumentation.java:1061)
10-22 15:29:40.897: E/AndroidRuntime(2561): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2128)
10-22 15:29:40.897: E/AndroidRuntime(2561): ... 11 more
I'm not really sure what is causing it as it is correctly listed in the manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.gvg.simid"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.READ_LOGS" />
<uses-permission android:name="android.permission.READ_OWNER_DATA" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.RECORD_AUDIO"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_OWNER_DATA" />
<uses-permission android:name="android.permission.WRITE_SETTINGS" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-feature android:name="android.hardware.usb.host" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.gvg.simid.Login"
android:label="#string/app_name"
android:screenOrientation="landscape">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
I also added "Android Private Libraries" to build path, and moved it to the top of "Order and Export", but it still gave me the same error.
EDIT: I rebuilt the project completely, and was unable to reproduce the error. Not sure what was causing it.
I had the same issue for my project. It happened due to the conflict in android support library version between my project and the library project that I added in my project. Put the same version android support library in your project and library projects you included and clean build... Everything will work...
This following method worked for me
Right click on your project and select properties
The "Properties for " panel will open. From the menu on the left go to Java Build Path -> Order and Export
From the list below uncheck the box next to "Android Dependencies"
Finally clean your project and run
For those of you who are having this issue on Android Studio, I had the same problem after a merge and for some reason it even persisted after clean and invalidate cash/restart operations which was driving me crazy.
Turns out, it can be fixed by running gradle build once from command line. Simply run the following n the project directory:
./gradlew assemble clean
./gradlew assemble
I hope it'd save someone the time waste and frustration I had to go through.
I had same issue, this worked for me
1) Full path of activity in mainfest in place of relative path.
2) Delete 'build' folder and clean project.
If you added a new Library Project as a module to your Android project and you're using Kotlin in your library do not forget to add
apply plugin: 'kotlin-android'
to top of your module's Gradle file. Android Studio does not add this line when you created a new module and this may waste your hours like me.
Edit: After a while, I just struggled with this problem again and this time I forgot to add my module as a dependency on the project. :)
If you are using Eclipse try Project -> Clean
This happens if we change Build Path of the APP, this can be in any case of Adding or Removing or Changing Libraries or .jar file. The Best solution is to Restart the Eclipse.
If you get this error while using the new Instant Run feature in Android Studio 2.0 and above then this is some kind of bug on their side.
To fix this you will have to stop your app manually on Device/Emulator if it's not stopped then from Android Studio select Build→Rebuild Project.
Then click the Run button or SHIFT+F10
For any one who is having multidex enable write this
inside build.gradle
apply plugin: 'com.android.application'
android {
defaultConfig {
multiDexEnabled true
}
dexOptions {
javaMaxHeapSize "4g"
}
}
dependencies {
compile 'com.android.support:appcompat-v7:+'
compile 'com.google.android.gms:play-services:+'
compile 'com.android.support:multidex:1.0.1'
}
write a class EnableMultiDex like below
import android.content.Context;
import android.support.multidex.MultiDexApplication;
public class EnableMultiDex extends MultiDexApplication {
private static EnableMultiDex enableMultiDex;
public static Context context;
public EnableMultiDex(){
enableMultiDex=this;
}
public static EnableMultiDex getEnableMultiDexApp() {
return enableMultiDex;
}
#Override
public void onCreate() {
super.onCreate();
context = getApplicationContext();
}
}
and in AndroidManifest.xml write this className inside Application tag
<application
android:name="YourPakageName.EnableMultiDex"
android:hardwareAccelerated="true"
android:icon="#drawable/wowio_launch_logo"
android:label="#string/app_name"
android:largeHeap="true"
tools:node="replace">
In my case it was proguard minification process that removed some important classes from my production apk.
The solution was to edit the proguard-rules.pro file and add the following:
-keep class com.someimportant3rdpartypackage.** { *; }
If you are using Multidex on Android 4.4 and prior, your issue might be that your activity class is located in the second dex file and therefore not found by the android system.
To keep your activity class in the main dex file, see this page:
https://developer.android.com/studio/build/multidex.html#keep
To find which classes are located in a dex file use Android Studio.
Simply drag n drop your apk into Android Studio. You should be able to see your dex files in the apk explorer.
Then select the dex file to see what classes are inside.
another alternative is dexdump:
You can check the content of your dex files contained in your apk by using the command dexdump which can be found in
android-sdk/build-tools/27.0.3/dexdump
For windows users see this tool I made to ease the process
I faced this error once when I defined a class that extended a view but referred to this custom view in the layout file with the wrong name. Instead of <com.example.customview/>, I had included <com.customview/> in the XML layout file.
1) Create libs folder under project root
2) Copy and paste the jar file into it
3) Configure the build path (Add jar)
4) Clean and run
cheers :-)
Believe me or not... I tried out almost each answer I had found here on stackoverflow. Nothing would help, until I just restarted the machine. My Android Studio works on Ubuntu 16.04 LTS.
I faced the same problem and solved it by doing the following:
From the build menu select
1- clean Project.
2- Build APK.
I met the same problem and I noticed the sample code was put under directory "java" instead of directory "src".
After moving the code to src, the problem was solved.
Also make sure the app directory is split into multiple folders.
e.g. /main/com/site/appname/ not /main/com.site.appname/
Hope it works~
I face the same problem , and after a lot of work and search , I figured out the solution : I just cleaned the project then build the apk.
-Build->Clean Project
-Build-> Build APK(s)
I hope it is useful.....
I had this issue recently and I am using Android Studio 0.8.4
The problem was the fact that I decided to rename an XML menu layout file that was called main.xml.
Right click on it and chose Refactor --> Rename. Before renaming it, be sure uncheck "Search in comments and strings" and pressed Refactor.
Because my file was originally named 'main', it renamed critical paths in the app.iml and build.gradle, mainly the java.srcDirs in the build.gradle, since the path is defined as 'src/main/java'.
I hope this helps anyone that may be experiencing this issue.
I had this problem after upgrading from version 18.
After the upgrade I had the following:
Project Build Target was 5.01, targetSDKVersion=21
But:
Build Tools were still from Android 4.3.1 (18)
What I noticed was that those apps that were deriving their activities from ActionBarActivity crashed with the above error those that did not still ran.
So the simple fix was to use the latest Android SDK Build Tools 21.1.2
instead of only those of Android SDK Build Tools 18, which seems somehow the default.
So the culprit seems the Appcompat library, which I use for Actionbar backward compability.
And a by the way: using the appcompat library I had to set/fix:
$SDKInstallDIR$\Android\android-sdk\extras\android\support\v7\appcompat\project.properties
target=android-21 (which was recommended in some other useful post and which has a value of 19 by default))
I had this problem several times and often I didn't do something obviously wrong with dependencies.
It's always a good idea to check if this 'not found' class is present in the final apk. If it is, like it happened in my cases, the problem usually is:
It's not that given class is not found, but it cannot be loaded because its super class is missing.
Check if class that you extend is available and then try to fix your build script or dependencies accordingly.
I had the same issue on Windows. I had renamed the path to the project to something containing a space.
Make sure the path to your project does not contain a space.
Solution mentioned here --> Multidex Issue solution worked for me. Below is what needs to be added to Application context :
#Override
protected void attachBaseContext(Context base) {
super.attachBaseContext(base);
MultiDex.install(this);
}
I had this issue, raised by several causes, but i see this in your stacktrace "**Unable to instantiate activity ComponentInfo{...}: java.lang.ClassNotFoundException: Didn't find class "..." on path: DexPathList[[**", I found a diference in my .classpath before it stop working.
<?xml version="1.0" encoding="UTF-8"?>
<classpath>
<classpathentry kind="src" path="src"/>
<classpathentry kind="con" path="com.android.ide.eclipse.adt.ANDROID_FRAMEWORK"/>
<classpathentry kind="con" path="com.android.ide.eclipse.adt.LIBRARIES"/>
<classpathentry kind="src" path="gen"/>
<classpathentry kind="output" path="bin/classes"/>
</classpath>
I've ADDED the line:
<classpathentry exported="true" kind="con" path="com.android.ide.eclipse.adt.DEPENDENCIES"/>
this is the final version:
<?xml version="1.0" encoding="UTF-8"?>
<classpath>
<classpathentry kind="src" path="src"/>
<classpathentry kind="con" path="com.android.ide.eclipse.adt.ANDROID_FRAMEWORK"/>
<classpathentry kind="con" path="com.android.ide.eclipse.adt.LIBRARIES"/>
<classpathentry exported="true" kind="con" path="com.android.ide.eclipse.adt.DEPENDENCIES"/>
<classpathentry kind="src" path="gen"/>
<classpathentry kind="output" path="bin/classes"/>
</classpath>
Now it works! =)
I had the same exact issue. As #weiweia suggested, move the code from the java directory to src worked for me. I also removed the Android Dependencies from Project --> Properties --> Java Build Path --> Order and Export, and made sure only to include Library Projects in the Android screen.
I had this problem for quite a while, and like everybody else the answers above didn't apply to my project.
In my project I had linked up a project to my project and it was throwing ClassDefNotFoundError every time some code for the other project was executed.
So this was my solution. I went to project properties of my project and Java Build Path. Pressed the "Source"-tab and "link source" from src-folder of the other project to my own project and named a new folder "core-src".
Hopes this solution helps someone
I had the same issue. I am using Xamarin.Android.
The problem in my case was that I changed the versionCode and versionName.
I had no problem when I had them set like this:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="pac.ka.ge" android:versionCode="1" android:versionName="1.0" android:installLocation="auto">
The issue appeared when I changed it to this (versionCode 2 and versionName 0.0.1):
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package=" pac.ka.ge " android:versionCode="2" android:versionName="0.0.1" android:installLocation="auto">
I fixed the issue by changing to versionCode 2 and versionName 1.0.0.1, like so:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package=" pac.ka.ge " android:versionCode="2" android:versionName="1.0.0.1" android:installLocation="auto">
I am unsure why this was a problem, maybe Android doesn't like a lower versionName with a higher versionCode?
I found the following on http://developer.android.com/guide/topics/manifest/manifest-element.html#vname
android:versionCode
An internal version number. This number is used only to determine whether one version is more recent than another, with higher numbers indicating more recent versions. This is not the version number shown to users; that number is set by the versionName attribute.
The value must be set as an integer, such as "100". You can define it however you want, as long as each successive version has a higher number. For example, it could be a build number. Or you could translate a version number in "x.y" format to an integer by encoding the "x" and "y" separately in the lower and upper 16 bits. Or you could simply increase the number by one each time a new version is released.
android:versionName
The version number shown to users. This attribute can be set as a raw string or as a reference to a string resource. The string has no other purpose than to be displayed to users. The versionCode attribute holds the significant version number used internally.
Just in case anybody faces the same problem as me and no suggest
answer here helps.
For me the cause was, that the Android studio refactor is buggy.
I moved an innerclass outside of a class, which was a View and therefore
also had a xml, where the direct path was set. This path will not get
refactored by studio! And no error will be thrown.
Hope this helps anybody. Cheers.
In our case we wanted to compile Vagrant version and had same error. We fixed it by clean project and rebuild project in Build menu
I just restarted the device and ran the app. It worked without any issues. Hope this helps someone :)
I found this error in Android Studio when i tried do debug in a device with API 23, so i checked the Android Studio and i noticed that i didnt had instaled this API 23 version. After install, i solved the problem.
I developed a android homescreen, the code seems right but when I run the project I get the following error:
java.lang.RuntimeException:
Unable to instantiate activity ComponentInfo{com.matthieu.launcher/
com.matthieu.launcher.DragableSpace}:
java.lang.InstantiationException: com.matthieu.launcher.DragableSpace
Here is the complete log: http://pastebin.com/iYtYW2W6
The code is straight from the Android Launcher.
DragableSpace: http://pastebin.com/jpWDtFPF
MainActivity:
public class MainActivity extends Activity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
DragableSpace space = new DragableSpace(this.getApplicationContext());
setContentView(space);
}
}
attr.xml in values folder:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="DragableSpace">
<attr name="default_screen" format="integer"/>
</declare-styleable>
</resources>
Three xml files initial_screen, left_screen and right_screen, all have same code apart from the id:
<LinearLayout android:id="#+id/center"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical">
</LinearLayout>
Manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.matthieu.launcher"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="#drawable/icon" android:label="#string/app_name">
<activity android:name=".MainActivity"
android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
Any ideas how to fix that?
Had a quick look at the code as it is now. NullPointerException at line 169 of DragableSpace, due to no child view - fix this by adding a child view in the MainActivity:
TextView child = new TextView(this);
child.setText("This is a Test");
space.addView(child);
So now the code runs and logs the touch events to LogCat but nothing appears to happen (I'm guessing you want 3 spaces which can be dragged and repositioned on the screen) - some initial problems, I think, the SNAP_VELOCITY value of 1000 seems a bit high to me for some dragging gestures, none of the layout xml files appear to be used, and if the current 'screen' is the full width and height of the device, where does it get dragged to?
Updated: Add the previous post's xml layout as the main.xml:
<?xml version="1.0" encoding="utf-8"?>
Now, in the MainActivity, set the content as:
setContentView(R.layout.main);
Also, to make it easier to see what's happening, I set the background colours to different colours - add the following colours to the strings.xml file:
<color name="green">#21d081</color>
<color name="blue">#00A0FF</color>
<color name="orange">#EA6700</color>
And edit the screen xml files to add a colour e.g. in the left_screen.xml file, add the following attribute:
android:background="#color/blue"
And use a different colour for the initial_screen.xml and the right_screen.xml and when you run the project, you can drag across the screen and reveal a new area.
On a side note, and this is more of an observation, in your DragableSpace code i've noticed two things.
In public DragableSpace(Context context, AttributeSet attrs) {... you haven't called a.recycle(); after you've accessed all your properties of obtainStyledAttributes. This is bad i think.
I'm not entirely sure, as i've just picked up java, but i found that i had to change super.DragableSpace(...) to this.DragableSpace(...). This could have just been particular to my component, but wasn't entirely sure if that was correct or not.
DragableSpace is a ViewGroup. DragableSpace is not an Activity. Home screens are activities. Hence, DragableSpace cannot be a home screen.