"Error: cannot find symbol class app"

Question

I have external package class (my custom library), which I want to include in the project. It uses Activity, but shows error as you see.

If I place this command in main project class, it works well... What to do?

Here is the code:

package com.__MyDefaultLibrary; import android.content.Intent; import android.content.SharedPreferences; import android.net.Uri; import android.os.Bundle; import android.os.Environment; import android.os.Handler; import android.preference.PreferenceManager; import android.view.View; import android.view.animation.AlphaAnimation; import android.view.animation.Animation; import android.view.animation.LinearInterpolator; import android.view.animation.ScaleAnimation; import android.widget.*; import java.io.File; import java.util.Calendar; // import android.app.Activity; import com.oceanesa.samplevideorecorder.R; public class __MyDefaultFunctions{ public android.app.Activity actv1 = android.app.Activity; public void Initt(){ PreferenceManager.setDefaultValues(actv1.getBaseContext(), R.xml.mypreferences, false); } // ========== MY CUSTOM LIBRARY =============// //button find public Button fvb(int id) { return (Button) actv1.findViewById(id); } //message show public void msg(String text) { Toast.makeText(actv1.getApplicationContext(), text, Toast.LENGTH_LONG).show(); } public View.OnClickListener optionsListener2 = new View.OnClickListener() { @Override public void onClick(View v) { Intent i = new Intent(actv1.getBaseContext(), com.__MyDefaultLibrary.__MyDefaultPreferencesInit1.class); actv1.startActivity(i); } }; }

And AndroidManifest.xml:

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.oceanesa.samplevideorecorder" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="16" android:targetSdkVersion="19" /> <uses-permission android:name="android.permission.WRITE_INTERNAL_STORAGE"/> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.RECORD_AUDIO" /> <uses-permission android:name="android.permission.CAMERA" /> <uses-feature android:name="android.hardware.camera" /> <uses-feature android:name="android.hardware.camera.autofocus" /> <uses-feature android:name="android.hardware.camera.front" android:required="false" /> <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:screenOrientation="landscape" android:theme="@style/AppTheme" > <activity android:name="com.oceanesa.samplevideorecorder.VideoCaptureExample" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name="com.__MyDefaultLibrary.__MyDefaultPreferencesInit1" android:label="@string/app_name" > <intent-filter> <action android:name="android.intent.action.MAIN_ACTIVITY" /> <category android:name="android.intent.category.DEFAULT" /> </intent-filter> </activity> </application> </manifest>

How did you create the Android Studio project which contains this code? — Code-Apprentice
– Code-Apprentice, Commented Jan 16, 2017 at 2:15
Possible duplicate of How to create a library project in Android Studio and an application project that uses the library project — Code-Apprentice
– Code-Apprentice, Commented Jan 16, 2017 at 2:17

Mina Fawzy · Accepted Answer · 2017-01-16 22:13:13Z

1

Update Answer just passing context to class

public class MyClass { private static Context mContext; private static Activity mActivity; public MyClass(Context c) { mContext= c; } public MyClass(Activity act) { mActivity= act; } public static void showToastMethod() { // then passing context or activity to Toast.makeText(mContext, "mymessage ", Toast.LENGTH_SHORT).show(); // or Toast.makeText(mActivity, "mymessage ", Toast.LENGTH_SHORT).show(); } }

edited Jan 16, 2017 at 22:13

answered Jan 16, 2017 at 8:47

Mina Fawzy

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6 Comments

T.Todua Over a year ago

Thanks,but I cant understand.. Activity is class of andoid.app package. And I my library, I have not any activity class.. (whats more, nothing like ActivityName at all). In my main project file, I have class XYZ extends Activty.

T.Todua Over a year ago

p.s. in both files, it imports successfulyy, but in the above given example file, it shows unused import statement.

Mina Fawzy Over a year ago

so what you trying to do in this line android.app.Activity actv1 = android.app.Activity ??

T.Todua Over a year ago

At first, thanks for answer....... in that external file (lets call it MyFunctions.java) I have this code: Toast.makeText(actv1.getApplicationContext(), "Helooo", Toast.LENGTH_LONG).show(); and want to make it work.. so, i wanted to set actv1 because, without classname, getApplicationContext() returns errors..

Mina Fawzy Over a year ago

just replace this code actv1.getApplicationContext() with context it will do the same job

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Community · Accepted Answer · 2017-05-23 12:33:53Z

Finally I got it working with the help of topic: How to display a Toast message in from a class that doesn't extend Activity

Problem was in my code. There was no need to call andorid.app at all. I didnt pass Activity to my external file, from where I couldnt call anything..

I had to pass activity like this (from main project file):

public MyExternalClass myEx = new MyExternalClass(Activity);

and needed some modifications...

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