how to start an activity in another module explicitly

Question

I created an aar and i added it to my project as an module. in this module i have a HelloWorldActivity that i want to run.

my module manifest looks like this.

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name="ir.sibvas.testlibary1.HelloWorldActivity"
        android:label="@string/app_name" >

        <intent-filter>
            <action android:name="ir.sibvas.testlibary1.HelloWorldActivity" />
            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
    </activity>

    <activity
        android:name=".MainActivity"
        android:label="@string/title_activity_main" >

        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>


    </activity>
</application>

Now i can start this activity from my project using this code

 Intent intent = new Intent("ir.sibvas.testlibary1.HelloWorldActivity");
 startActivity(intent);

but as you can see this code is implicit and problem with implicit calling is that if i use this module in more than one app, both installed on user device it will show an app chooser dialog to user. So how can make this call explicit, preventing user from switching app?

this code will not run since HelloWorldActivity is not in the same package as calling activity

Intent intent = new Intent(this, HelloWorldActivity.class);
startActivity(intent);

I really don't want to change my module for each project that uses it.

Intent intent = new Intent(MainActivity.this, HelloWorldActivity.class);//use MainActivity.this instead of this — Prathap Badavath, Dec 21 '15 at 13:25

score 80 · Accepted Answer · edited Sep 22 '17 at 11:22

80

You can use the Class.forName(), it worked for me when i was needed to start activity which is in another module in my project.

 Intent intent = null;
    try {
        intent = new Intent(this, 
           Class.forName("ir.sibvas.testlibary1.HelloWorldActivity"));
        startActivity(intent);
    } catch (ClassNotFoundException e) {
        e.printStackTrace();
    }

edited Sep 22 '17 at 11:22

ZooMagic

616
7
15

answered Jun 01 '17 at 11:13

Moti Bartov

3,454
33
42

2

I have tested that defining as Activity in Manifest.xml fine is NOT necessary. – Alp Altunel May 08 '18 at 08:49
1

I was using ```Intent().setClassName(context, className)``` and this answer saved my day! – Jose Flavio Quispe Irrazábal May 07 '19 at 02:32
you save my day!! – Ginanjar Setiawan Jun 16 '23 at 18:22

mewadaarvind · Answer 2 · 2022-08-10T11:05:02.440

5

First module activity launch then second module activity launch and write a line of code is perfectly fine.

try {
  Intent launchIntent =
      getPackageManager().getLaunchIntentForPackage("com.your.packagename");
  if (launchIntent != null) {
    startActivity(
        launchIntent); //null pointer check in case package name was not found ClassNotFoundException
  }
} catch (e) {
  e.printStackTrace();
}

edited Aug 10 '22 at 11:05

answered May 18 '19 at 12:21

mewadaarvind

349
3
9

score 1 · Answer 3 · answered Jan 15 '21 at 10:23

1

Intent intent = new Intent();
intent.setClassName(context.getPackageName(), "ir.sibvas.testlibary1.HelloWorldActivity");
startActivity(intent);

answered Jan 15 '21 at 10:23

Salman Qadami

174
3

how to start an activity in another module explicitly

3 Answers3

Linked