CODEWITHSUNDEEP
c#androidandroid-intentandroid-activityxamarin
Boris
Boris

Reputation: 8931

Unable to instantiate activity ComponentInfo Exception

My app can be started in two ways:

The first method works just fine. The main activity opens up, and the user can use the app. The second method however produces the following error/crash:

Unable to instantiate activity ComponentInfo{de.mystuff.myapp/de.mystuff.myapp.MainActivity}: java.lang.ClassNotFoundException: Didn't find class "de.mystuff.myapp.MainActivity" on path: DexPathList[[zip file "/data/app/de.mystuff.myapp-1/base.apk"],nativeLibraryDirectories=[/data/app/de.mystuff.myapp-1/lib/arm, /data/app/de.mystuff.myapp-1/base.apk!/lib/armeabi-v7a, /vendor/lib, /system/lib]]

In my manifest I have declared the main activity as follows:

<activity android:name=".MainActivity" android:theme="@style/AppTheme">
            <intent-filter>
                <action android:name="android.intent.action.CALL" />
                <category android:name="android.intent.category.DEFAULT" />
                <action android:name="android.intent.action.CALL_PRIVILEGED" />
                <data android:scheme="tel" />
            </intent-filter>
        </activity>

And my activity's code looks like this:

[Activity (Label = "MyApp", MainLauncher = true, Icon = "@mipmap/ic_launcher")]
  public class MainActivity : Activity, SwipeRefreshLayout.IOnRefreshListener
  {
    AppSettings mAppSettings;

    ContactListViewAdapter mListViewAdapter;

    SwipeRefreshLayout mSwiper;

    protected override void OnCreate (Bundle savedInstanceState)
    {
      base.OnCreate (savedInstanceState);
      SetContentView (Resource.Layout.Main);

      // Do some other init stuff
    }
}

Upvotes: 0

Views: 1839

Answers (2)

Jamshaid K.
Jamshaid K.

Reputation: 4547

For Xamarin.Android, I was able to solve this problem by removing activity declaration and setting my package as ProjectNamespace.ProjectNamespace in the AndroidManifest.xml. I don't know why it worked but it did.

Here is how my Manifest file looks:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="CSharpApp.CSharpApp" android:installLocation="auto">
  <uses-permission android:name="android.permission.CALL_PHONE" />
  <uses-permission android:name="android.permission.INTERNET" />
  <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
  <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
  <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

  <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:theme="@style/AppTheme.NoActionBar" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true">
    <meta-data android:name="com.google.android.geo.API_KEY" android:value="@string/maps_api_key" />
  </application>

  <uses-sdk android:minSdkVersion="15" android:targetSdkVersion="25" />
</manifest>

Upvotes: 0

Sven-Michael St&#252;be
Sven-Michael St&#252;be

Reputation: 14750

You should avoid to mix up declarative style and manually writing the AndroidManifest.xml.

[Activity (Label = "MyApp", MainLauncher = true, Icon = "@mipmap/ic_launcher")] is generating a piece of code in the actual used (generated) AndroidManifest.xml that looks like: 

<activity android:icon="@drawable/icon" android:label="AndroidApp1" android:name="md5c178831cd46fc53bebc42cf953f78ced.MainActivity">
  <intent-filter>
    <action android:name="android.intent.action.MAIN" />
    <category android:name="android.intent.category.LAUNCHER" />
  </intent-filter>
</activity>

and your code will be somewhere else. You can find the generated AndroidManifest.xml in the output folder .\obj\Debug\android.

Solution:

You can add your stuff via attributes like:

[Activity (Label = "MyApp", MainLauncher = true, Icon = "@mipmap/ic_launcher")]
[IntentFilter(
    new [] { Intent.ActionCall, "android.intent.action.CALL_PRIVILEGED" },
    Categories = new [] {Intent.CategoryDefault},
    DataScheme = "tel")]
public class MainActivity : Activity, SwipeRefreshLayout.IOnRefreshListener
{
    // ...
}

And remove the manual edits from your manifest file. The output will look like:

<activity android:icon="@drawable/icon" android:label="AndroidApp1" android:name="md5c178831cd46fc53bebc42cf953f78ced.MainActivity">
  <intent-filter>
    <action android:name="android.intent.action.MAIN" />
    <category android:name="android.intent.category.LAUNCHER" />
  </intent-filter>
  <intent-filter>
    <action android:name="android.intent.action.CALL" />
    <action android:name="android.intent.action.CALL_PRIVILEGED" />
    <category android:name="android.intent.category.DEFAULT" />
    <data android:scheme="tel" />
  </intent-filter>
</activity>

Upvotes: 4

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