Runtimeexception: Unable to get androidx.core.content.FileProvider: ClassNotFoundExecption: appears on my Galaxy S8

huangapple
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英文:

Runtimeexception: Unable to get androidx.core.content.FileProvider: ClassNotFoundExecption: appears on my Galaxy S8

问题

抱歉，我无法识别你要翻译的代码部分，请提供需要翻译的文本内容。

英文:

Hello my dear friends,

I am trying to develop media files to my server with the help of Retrofit and a Fileprovider.

Like the title already describes my situation, am I looking for a solution of the following error. This error let the app crash during the launch while the app runs without issues on other phones. I am trying for a week now to fix this error and tried everything from Multidex integration, writing a new java path for my SDK, checking my permissions and clearing my mobile's cache.

To be honest, I am not really good at understanding the logcat when it comes to files in the background that I have not seen before. Apparently, the app does not find my Fileprovider class. I defined the Fileprovider in my manifest file and wrote a corresponding file_path.xml file. I could not find the need of a specific Java provider.class nor any gradle dependencies to make a fileprovider work.

I am excited what you say to my problem and to my logcat. I appreciate every useful information!

Thank you for reading.

My Logcat:

  1.   java.lang.RuntimeException: Unable to instantiate application com.example.loginandregister.MainActivity: java.lang.ClassCastException: com.example.loginandregister.MainActivity cannot be cast to android.app.Application
  2.         at android.app.LoadedApk.makeApplication(LoadedApk.java:979)
  3.         at android.app.ActivityThread.handleBindApplication(ActivityThread.java:6030)
  4.         at android.app.ActivityThread.-wrap1(Unknown Source:0)
  5.         at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1764)
  6.         at android.os.Handler.dispatchMessage(Handler.java:105)
  7.         at android.os.Looper.loop(Looper.java:164)
  8.         at android.app.ActivityThread.main(ActivityThread.java:6938)
  9.         at java.lang.reflect.Method.invoke(Native Method)
  10.         at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
  11.         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)
  12.      Caused by: java.lang.ClassCastException: com.example.loginandregister.MainActivity cannot be cast to android.app.Application
  13.         at android.app.Instrumentation.newApplication(Instrumentation.java:1108)
  14.         at android.app.Instrumentation.newApplication(Instrumentation.java:1093)
  15.         at android.app.LoadedApk.makeApplication(LoadedApk.java:973)
  16.         at android.app.ActivityThread.handleBindApplication(ActivityThread.java:6030) 
  17.         at android.app.ActivityThread.-wrap1(Unknown Source:0) 
  18.         at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1764) 
  19.         at android.os.Handler.dispatchMessage(Handler.java:105) 
  20.         at android.os.Looper.loop(Looper.java:164) 
  21.         at android.app.ActivityThread.main(ActivityThread.java:6938) 
  22.         at java.lang.reflect.Method.invoke(Native Method) 
  23.         at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327) 
  24.         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374) 

My Manifest file:

  1. <manifest xmlns:android="http://schemas.android.com/apk/res/android"
  2.     package="com.example.retrofit_uploadmediafiles">
  4.     <uses-permission android:name="android.permission.INTERNET"/>
  5.     <uses-permission android:name="android.permission.READ_INTERNAL_STORAGE"/>
  6.     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
  7.     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
  9.     <application
  11.         android:allowBackup="true"
  12.         android:icon="@mipmap/ic_launcher"
  13.         android:label="@string/app_name"
  14.         android:roundIcon="@mipmap/ic_launcher_round"
  15.         android:supportsRtl="true"
  16.         android:theme="@style/AppTheme">
  18.         <activity android:name=".MainActivity">
  19.             <intent-filter>
  20.                 <action android:name="android.intent.action.MAIN" />
  21.                 <category android:name="android.intent.category.LAUNCHER" />
  22.             </intent-filter>
  23.         </activity>
  24.         <activity android:name=".ImageActivity"/>
  28.         <provider
  29.             android:name="androidx.core.content.FileProvider"
  30.             android:authorities="com.example.retrofit_uploadmediafiles.fileprovider"
  31.             android:exported="false"
  32.             android:grantUriPermissions="true">
  33.             <meta-data
  34.                 android:name="android.support.FILE_PROVIDER_PATHS"
  35.                 android:resource="@xml/provider_paths"/>
  36.         </provider>
  37.     </application>

My Gradle file (I included many dependencies out of desperation ...):

  1. android {
  2.     compileSdkVersion 29
  4.     defaultConfig {
  5.         applicationId "com.example.retrofit_uploadmediafiles"
  6.         minSdkVersion 23
  7.         targetSdkVersion 29
  8.         versionCode 1
  9.         versionName "1.0"
  11.         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
  13.         multiDexEnabled true
  14.     }
  16.     buildTypes {
  17.         release {
  18.             minifyEnabled false
  19.             proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
  20.         }
  21.     }
  22. }
  24. dependencies {
  25.     implementation fileTree(dir: "libs", include: ["*.jar"])
  26.     implementation 'androidx.appcompat:appcompat:1.1.0'
  27.     implementation 'androidx.core:core:1.3.0'
  28.     implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
  29.     implementation 'androidx.test:runner:1.2.0'
  30.     testImplementation 'junit:junit:4.12'
  31.     androidTestImplementation 'androidx.test.ext:junit:1.1.1'
  32.     androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
  33.     implementation 'com.afollestad.material-dialogs:core:0.9.4.5'
  34.     implementation 'com.github.bumptech.glide:glide:4.11.0'
  35.     androidTestImplementation 'com.android.support.test:runner:1.0.2'
  38.     implementation "androidx.multidex:multidex:2.0.1"
  40.     implementation 'com.squareup.retrofit2:retrofit:2.9.0'
  41.     implementation 'com.squareup.retrofit2:converter-gson:2.9.0'
  42.     implementation 'com.rengwuxian.materialedittext:library:2.1.4'
  44.     implementation group: 'commons-io', name: 'commons-io', version: '2.7'
  45. }

My Main Activity:

  1. public class MainActivity extends AppCompatActivity  implements View.OnClickListener{
  2.     private Button image, video, pdf;
  5.     @Override
  6.     protected void onCreate(Bundle savedInstanceState) {
  7.         MultiDex.install(this);
  8.         super.onCreate(savedInstanceState);
  10.         setContentView(R.layout.activity_main);
  12.         image = findViewById(R.id.image);
  13.         video = findViewById(R.id.video);
  14.         pdf = findViewById(R.id.Pdf);
  16.         if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
  17.             image.setEnabled(false);
  18.             video.setEnabled(false);
  19.             pdf.setEnabled(false);
  20.             ActivityCompat.requestPermissions(this, new String[] {Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE}, 0);
  21.         } else {
  22.             image.setEnabled(true);
  23.             video.setEnabled(true);
  24.             pdf.setEnabled(true);
  25.         }
  27.         image.setOnClickListener(this);
  28.         video.setOnClickListener(this);
  29.         pdf.setOnClickListener(this);
  32.     }
  34.     @Override
  35.     public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
  36.         if(requestCode == 0 ) {
  37.             if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
  38.                 image.setEnabled(true);
  39.                 video.setEnabled(true);
  40.                 pdf.setEnabled(true);
  41.             }
  42.         }
  43.     }
  45.     @Override
  46.     public void onClick(View view) {
  47.         switch (view.getId()) {
  48.             case R.id.image:
  49.                 Intent intent = new Intent(this, ImageActivity.class);
  50.                 startActivity(intent);
  51.                 break;
  52.             case R.id.video:
  53.                 //Intent intent2 = new Intent(this, VideoActivity.class);
  54.                 //startActivity(intent2);   I am trying to make the image upload work for now 
  55.                 break;
  56.             case R.id.Pdf:
  57.                 //Intent intent3 = new Intent(this, PdfActivity.class);
  58.                 //startActivity(intent3);
  59.                 break;
  60.         }
  61.     }
  66. }

I am a little bit overwhelmed by all these different software versions on my phone:

Android version: 8.0.0
Samsung Experience version: 9.0
Knox version:3.0, API level 24

Let me know if you need more information

答案1

得分: 2

我已解决了这个问题。
我在defaultConfig内的build.gradle中设置了androidx.core:core:1.8.0。

  1. configurations.all {
  2.     resolutionStrategy {
  3.         force 'androidx.core:core:1.8.0'
  4.     }
  5. }

然后将compileSdkVersion更改为32。
清理项目并重新构建项目，最后一切都正常。

英文:

I have solved this problem.<br/> I set androidx.core:core:1.8.0 in build.gradle inside defaultConfig.

  1. configurations.all {
  2.     resolutionStrategy {
  3.         force &#39;androidx.core:core:1.8.0&#39;
  4.     }
  5. }

Then change compileSdkVersion to 32.<br/>
Clean project and rebuild project, finally everything be ok.

答案2

得分: 0

The AppCompat dependency compiles the Fileprovider which is within the androidx.core:core package as its dependency. Therefore remove this line implementation 'androidx.core:core:1.3.0' from your gradle file to see if it works. Because appcompat lib has version 1.1.0 while u still compiled 1.3.0 in your project.

英文:

The AppCompat dependency compiles the Fileprovider which is within the androidx.core:core package as its dependency. Therefore remove this line implementation &#39;androidx.core:core:1.3.0&#39; from your gradle file to see if it works. Because appcompat lib has version 1.1.0 while u still compiled 1.3.0 in your project.

huangapple
  • 本文由 发表于 2020年7月22日 22:23:53
  • 转载请务必保留本文链接：https://go.coder-hub.com/63036519.html
  • android
  • android-fileprovider
  • build.gradle
  • java
  • samsung-galaxy
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