How to send data between one application to other application in android?

Question

i\'ve tried to sending data between App1 to App2 via Intent in Android

i used this code but i couldn\'t resolve my problem.

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Answer 1

My requirement was to send the "user id" from App1 to App2 and get "username" back to App1.

I needed to launch my app directly without any chooser. I was able to achieve this using implicit intent and startActivityForResult.

App1 > MainActivity.java

private void launchOtherApp() {
    Intent sendIntent = new Intent();
    //Need to register your intent filter in App2 in manifest file with same action.
    sendIntent.setAction("com.example.sender.login"); // 
    Bundle bundle = new Bundle();
    bundle.putString("user_id", "1111");
    sendIntent.putExtra("data", bundle);
    sendIntent.setType("text/plain");
    if (sendIntent.resolveActivity(getPackageManager()) != null) {
        startActivityForResult(sendIntent, REQUEST_CODE);
    }
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == REQUEST_CODE) {
        if (resultCode == Activity.RESULT_OK) {
            Bundle bundle = data.getBundleExtra("data");
            String username = bundle.getString("user_name");
            result.success(username);
        }
    } else {
        super.onActivityResult(requestCode, resultCode, data);
    }
}

I had two activity in App2 ie. MainActivity and LoginActivity.

App2 > AndroidManifest.xml

Sorry for this I had a little mix up with Java and Kotlin. My second app was in Kotlin, not that it will effect in any way.

App2 > LoginActivity.java

override fun onResume() {
    super.onResume()
    var userId = "No data received"
    val intent = intent
    if (intent != null
        && intent.action != null
        && intent.action.equals("com.example.sender.login")
    ) {
        val bundle = intent.getBundleExtra("data")
        if (bundle != null) {
            userId = bundle.getString("user_id")
            userId = " User id is $userId"
        }
    }
    tvMessage.text = "Data Received: $userId"
}

fun onClickBack(view: View) {
    val intent = intent
    val bundle = Bundle()
    bundle.putString("sesion_id", "2222")
    intent.putExtra("data", bundle)
    setResult(Activity.RESULT_OK, intent)
    finish()
}