Opening Google Translate from your app

MainActivity.kt

package net.chmielowski.translatetest

import android.content.ActivityNotFoundException
import android.content.Context
import android.content.Intent
import android.content.pm.ActivityInfo
import android.content.pm.ResolveInfo
import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.padding
import androidx.compose.material.Icon
import androidx.compose.material.IconButton
import androidx.compose.material.MaterialTheme
import androidx.compose.material.Scaffold
import androidx.compose.material.Text
import androidx.compose.material.TopAppBar
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.GTranslate
import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp
import net.chmielowski.translatetest.ui.theme.TranslateTestTheme

// Source: https://en.wikipedia.org/wiki/Dog
private const val dogDescription =
    "The dog or domestic dog, (Canis familiaris or Canis lupus familiaris) is a domesticated descendant of the wolf which is characterized by an upturning tail. The dog derived from an ancient, extinct wolf, and the modern grey wolf is the dog's nearest living relative. The dog was the first species to be domesticated, by hunter–gatherers over 15,000 years ago, before the development of agriculture."

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            TranslateTestTheme {
                val translateActivity = googleTranslateActivityInfo()
                MainScreen(
                    title = "Dog",
                    body = dogDescription,
                    showTranslateButton = translateActivity != null,
                    onTranslateClick = { openGoogleTranslate(translateActivity!!, dogDescription) },
                )
            }
        }
    }
}

@Composable
private fun MainScreen(
    title: String,
    body: String,
    showTranslateButton: Boolean,
    onTranslateClick: () -> Unit,
) {
    Scaffold(
        topBar = {
            TopAppBar(
                title = { Text(text = title) },
                actions = {
                    if (showTranslateButton) {
                        IconButton(onClick = onTranslateClick) {
                            Icon(Icons.Default.GTranslate, contentDescription = "Translate")
                        }
                    }
                }
            )
        },
        content = {
            Text(
                text = body,
                style = MaterialTheme.typography.body2,
                modifier = Modifier.padding(16.dp),
            )
        },
    )
}

fun Context.openGoogleTranslate(activity: ActivityInfo, text: String) {
    val intent = Intent()
        .setAction(Intent.ACTION_PROCESS_TEXT)
        .setType("text/plain")
        .putExtra(Intent.EXTRA_PROCESS_TEXT, text)
        .putExtra(Intent.EXTRA_PROCESS_TEXT_READONLY, true)
        .setClassName(activity.packageName, activity.name)
    try {
        startActivity(intent)
    } catch (e: ActivityNotFoundException) {
        // TODO: Show error
    }
}

/**
 *  Remember to add to AndroidManifest.xml the following:
 *
 *  <queries>
 *      <intent>
 *          <action android:name="android.intent.action.PROCESS_TEXT" />
 *          <data android:mimeType="text/plain" />
 *      </intent>
 *  </queries>
 */
private fun Context.queryProcessTextActivities(): List<ResolveInfo> {
    val intent = Intent()
        .setAction(Intent.ACTION_PROCESS_TEXT)
        .setType("text/plain")
    return packageManager.queryIntentActivities(intent, 0)
}

private fun Context.googleTranslateActivityInfo() = queryProcessTextActivities()
    .firstOrNull { it.activityInfo.packageName == "com.google.android.apps.translate" }
    ?.activityInfo