Java How to launch myapp by opening an image?

I'm working on an image editor app and I want to have my app being in the 'Open With ...' list when the user clicks on an image from file manager or ... (Like how 'Photo Editor' app did) :

Click to see the example (Edited)

And the problem is that I don't know how to do such a thing.

I have researched in youtube and I found that it's about the intent filter in the Manifest.xml file.

I already tried adding some <action/> to my intent filter by random but it didn't worked.

Solution

Go to the Manifest file and search for your LAUNCHER activity for example SplashActivity

like this

  <activity
    android:name=".SplashActivity"
    android:exported="true">
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />

        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
      //this below code help you to get image from other apps if shared
     <intent-filter>
        <action android:name="android.intent.action.SEND"/>
        <category android:name="android.intent.category.DEFAULT"/>
            <data android:mimeType="image/*" />
    </intent-filter>

</activity>

And To get that data in your SplashActivity do this :

 Intent intent = getIntent();
 String action = intent.getAction();
 String type = intent.getType();
 //this will check that you are getting only image type not text
 boolean isImage = Intent.ACTION_SEND.equals(action) && "image/*".equals(type);

if(getIntent().getData() != null && isImage){
 // here you got the data and you can send this data or uri 
 // to your image editor activity
 Uri imageUri = intent.getData();
}

And you can send that image to the next activity by doing this

you can store the URI as a string

Intent nextIntent = new Intent(this, EditorActivity.java);
nextIntent.putExtra("imageUri", imageUri.toString());
startActivity(nextIntent)

and then just convert the string back to URI like this in your (EditorActivity)

Uri myUri = Uri.parse(getIntent().getStringExtra("imageUri"));