getApplicationContext() returns null in Application class

Question

I have created a Shopper class which extends Application class for my project. This is how I am trying to get context in the class

public class Shopper extends Application {
    private Context context;

    @Override
    public void onCreate() {
        super.onCreate();
        context = getApplicationContext();
    }

    public Context getContext() {
        return context;
    }
}

But getApplicationContext always returns null. Am I missing something? I have looked at this and this to get an idea on how to do it; but still the same result.

I have added the name of the class to the manifest.

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="vn.com.shopper">

    <application
        android:name=".Shopper"
        android:allowBackup="false"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/ShopperTheme"
        android:fullBackupContent="true">
        <activity android:name=".LoginActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

EDIT

Correct me if I am wrong (I might be probably), but I don't understand how having the field context as static can affect the value of getApplicationContext (this is what most answers are pointing out).

why do you need to get context like that? the context will be available in all your activities if you have defined the application class in manifest. — Umar Hussain, Sep 06 '17 at 06:18
your Shoper.getContext() returns null or getApplicationContext()? — Navin Gupta, Sep 06 '17 at 06:20
@NguyễnTrungHiếu I have already posted the necessary code. — Ajil O., Sep 06 '17 at 06:26
@AjilO. `android:name=` set full class name .Uninstall old app and run — IntelliJ Amiya, Sep 06 '17 at 07:13
@IntelliJAmiya No ):. I am going to assume something broke in the project. I am *re-making* the project again — Ajil O., Sep 07 '17 at 07:54

score 1 · Accepted Answer · answered Sep 06 '17 at 06:27

1

You must use static

public class Shopper extends Application {
private static Context context;

@Override
public void onCreate() {
    super.onCreate();
    context = getApplicationContext();
}

public static Context getContext() {
    return context;
}
}

And use

Shopper.getContext();

answered Sep 06 '17 at 06:27

Nguyễn Trung Hiếu

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3

I have tried this. Same result. `getApplicationContext` returns `null` – Ajil O. Sep 06 '17 at 06:28
your code not use **static**. You can't call method getContext(); – Nguyễn Trung Hiếu Sep 06 '17 at 06:30
1

In the code I posted it does not show that I used `static`; but the first [link](https://stackoverflow.com/a/21819009/6891637) that I tried used static and it did not work for me. – Ajil O. Sep 06 '17 at 06:33

score 0 · Answer 2 · answered Sep 06 '17 at 06:30

private static Application _instance;
public static Application getAppContext() {
        return _instance;
    }
@Override
public void onCreate() {
    super.onCreate();
   _instance = this;
}

Now you can easily use getAppContext method in whole app all classes to get application context.

getApplicationContext() returns null in Application class

2 Answers2