App crashes after reinstall on emulator since FileProvider Class was not found

Question

When I run the app on the emulator it always works on the first try. But when the app is already installed on the emulator it often results in a crash during the start of th

Answer 1

If you use Android 5.0 or lower in your emulator (api level 21), then add the multidex support library to your project:

1. If your minSdkVersion is set to 21 or higher, all you need to do is set multiDexEnabled to true in your module-level build.gradle file, as shown here:

   android {
       defaultConfig {
           ...
           minSdkVersion 21 
           targetSdkVersion 26
           multiDexEnabled true
       }
       ...
   }
   

   2. if your minSdkVersion is set to 20 or lower, then you must use the multidex support library as follows:

   Modify the module-level build.gradle file to enable multidex and add the multidex library as a dependency, as shown here:

   android {
       defaultConfig {
           ...
           minSdkVersion 15 
           targetSdkVersion 26
           multiDexEnabled true
       }
       ...
   }
   

   dependencies { compile 'com.android.support:multidex:1.0.1' }

Look at https://developer.android.com/studio/build/multidex.html#mdex-gradle

Answer 2

If you are using androidx libraries, in AndroidManifest.xml, change this:

android:name="android.support.v4.content.FileProvider"

to this:

android:name="androidx.core.content.FileProvider"