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159 changes: 159 additions & 0 deletions
159
...app/src/main/kotlin/com/google/firebase/quickstart/vertexai/feature/image/ImagenScreen.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,159 @@ | ||
| /* | ||
| * Copyright 2023 Google LLC | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
||
| package com.google.firebase.quickstart.vertexai.feature.image | ||
|
|
||
| import androidx.compose.foundation.Image | ||
| import androidx.compose.foundation.layout.Box | ||
| import androidx.compose.foundation.layout.Column | ||
| import androidx.compose.foundation.layout.fillMaxWidth | ||
| import androidx.compose.foundation.layout.padding | ||
| import androidx.compose.foundation.rememberScrollState | ||
| import androidx.compose.foundation.verticalScroll | ||
| import androidx.compose.material3.Card | ||
| import androidx.compose.material3.CardDefaults | ||
| import androidx.compose.material3.CircularProgressIndicator | ||
| import androidx.compose.material3.ElevatedCard | ||
| import androidx.compose.material3.MaterialTheme | ||
| import androidx.compose.material3.OutlinedTextField | ||
| import androidx.compose.material3.Text | ||
| import androidx.compose.material3.TextButton | ||
| import androidx.compose.runtime.Composable | ||
| import androidx.compose.runtime.collectAsState | ||
| import androidx.compose.runtime.getValue | ||
| import androidx.compose.runtime.mutableStateOf | ||
| import androidx.compose.runtime.saveable.rememberSaveable | ||
| import androidx.compose.runtime.setValue | ||
| import androidx.compose.ui.Alignment | ||
| import androidx.compose.ui.Modifier | ||
| import androidx.compose.ui.graphics.asImageBitmap | ||
| import androidx.compose.ui.res.stringResource | ||
| import androidx.compose.ui.tooling.preview.Preview | ||
| import androidx.compose.ui.unit.dp | ||
| import androidx.lifecycle.viewmodel.compose.viewModel | ||
| import com.google.firebase.quickstart.vertexai.GenerativeViewModelFactory | ||
| import com.google.firebase.quickstart.vertexai.R | ||
| import com.google.firebase.quickstart.vertexai.ui.theme.GenerativeAISample | ||
|
|
||
| @Composable | ||
| internal fun ImagenRoute( | ||
| imagenViewModel: ImagenViewModel = viewModel(factory = GenerativeViewModelFactory) | ||
| ) { | ||
| val imagenUiState by imagenViewModel.uiState.collectAsState() | ||
|
|
||
| ImagenScreen(imagenUiState, onImagenClicked = { inputText -> | ||
| imagenViewModel.generateImage(inputText) | ||
| }) | ||
| } | ||
|
|
||
| @Composable | ||
| fun ImagenScreen( | ||
| uiState: ImagenUiState = ImagenUiState.Loading, | ||
| onImagenClicked: (String) -> Unit = {} | ||
| ) { | ||
| var imagenPrompt by rememberSaveable { mutableStateOf("") } | ||
|
|
||
| Column( | ||
| modifier = Modifier | ||
| .verticalScroll(rememberScrollState()) | ||
| ) { | ||
| ElevatedCard( | ||
| modifier = Modifier | ||
| .padding(all = 16.dp) | ||
| .fillMaxWidth(), | ||
| shape = MaterialTheme.shapes.large | ||
| ) { | ||
| OutlinedTextField( | ||
| value = imagenPrompt, | ||
| label = { Text(stringResource(R.string.imagen_label)) }, | ||
| placeholder = { Text(stringResource(R.string.imagen_hint)) }, | ||
| onValueChange = { imagenPrompt = it }, | ||
| modifier = Modifier | ||
| .padding(16.dp) | ||
| .fillMaxWidth() | ||
| ) | ||
| TextButton( | ||
| onClick = { | ||
| if (imagenPrompt.isNotBlank()) { | ||
| onImagenClicked(imagenPrompt) | ||
| } | ||
| }, | ||
| modifier = Modifier | ||
| .padding(end = 16.dp, bottom = 16.dp) | ||
| .align(Alignment.End) | ||
| ) { | ||
| Text(stringResource(R.string.action_go)) | ||
| } | ||
| } | ||
|
|
||
| when (uiState) { | ||
| ImagenUiState.Initial -> { | ||
| // Nothing is shown | ||
| } | ||
|
|
||
| ImagenUiState.Loading -> { | ||
| Box( | ||
| contentAlignment = Alignment.Center, | ||
| modifier = Modifier | ||
| .padding(all = 8.dp) | ||
| .align(Alignment.CenterHorizontally) | ||
| ) { | ||
| CircularProgressIndicator() | ||
| } | ||
| } | ||
|
|
||
| is ImagenUiState.Success -> { | ||
| Card( | ||
| modifier = Modifier | ||
| .padding(start = 16.dp, end = 16.dp, bottom = 16.dp) | ||
| .fillMaxWidth(), | ||
| shape = MaterialTheme.shapes.large, | ||
| colors = CardDefaults.cardColors( | ||
| containerColor = MaterialTheme.colorScheme.onSecondaryContainer | ||
| ) | ||
| ) { | ||
| Image(bitmap = uiState.image.asImageBitmap(), "") | ||
| } | ||
| } | ||
|
|
||
| is ImagenUiState.Error -> { | ||
| Card( | ||
| modifier = Modifier | ||
| .padding(horizontal = 16.dp) | ||
| .fillMaxWidth(), | ||
| shape = MaterialTheme.shapes.large, | ||
| colors = CardDefaults.cardColors( | ||
| containerColor = MaterialTheme.colorScheme.errorContainer | ||
| ) | ||
| ) { | ||
| Text( | ||
| text = uiState.errorMessage, | ||
| color = MaterialTheme.colorScheme.error, | ||
| modifier = Modifier.padding(all = 16.dp) | ||
| ) | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| @Composable | ||
| @Preview(showSystemUi = true) | ||
| fun ImagenScreenPreview() { | ||
| GenerativeAISample(darkTheme = true) { | ||
| ImagenScreen() | ||
| } | ||
| } |
49 changes: 49 additions & 0 deletions
49
...pp/src/main/kotlin/com/google/firebase/quickstart/vertexai/feature/image/ImagenUiState.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,49 @@ | ||
| /* | ||
| * Copyright 2023 Google LLC | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
||
| package com.google.firebase.quickstart.vertexai.feature.image | ||
|
|
||
| import android.graphics.Bitmap | ||
|
|
||
| /** | ||
| * A sealed hierarchy describing the state of the text generation. | ||
| */ | ||
| sealed interface ImagenUiState { | ||
|
|
||
| /** | ||
| * Empty state when the screen is first shown | ||
| */ | ||
| data object Initial : ImagenUiState | ||
|
|
||
| /** | ||
| * Still loading | ||
| */ | ||
| data object Loading : ImagenUiState | ||
|
|
||
| /** | ||
| * Text has been generated | ||
| */ | ||
| data class Success( | ||
| val image: Bitmap | ||
| ) : ImagenUiState | ||
|
|
||
| /** | ||
| * There was an error generating an image | ||
| */ | ||
| data class Error( | ||
| val errorMessage: String | ||
| ) : ImagenUiState | ||
| } |
51 changes: 51 additions & 0 deletions
51
.../src/main/kotlin/com/google/firebase/quickstart/vertexai/feature/image/ImagenViewModel.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,51 @@ | ||
| /* | ||
| * Copyright 2023 Google LLC | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
||
| package com.google.firebase.quickstart.vertexai.feature.image | ||
|
|
||
| import androidx.lifecycle.ViewModel | ||
| import androidx.lifecycle.viewModelScope | ||
| import com.google.firebase.vertexai.ImagenModel | ||
| import kotlinx.coroutines.flow.MutableStateFlow | ||
| import kotlinx.coroutines.flow.StateFlow | ||
| import kotlinx.coroutines.flow.asStateFlow | ||
| import kotlinx.coroutines.launch | ||
|
|
||
| class ImagenViewModel( | ||
| private val imageModel: ImagenModel | ||
| ) : ViewModel() { | ||
|
|
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| private val _uiState: MutableStateFlow<ImagenUiState> = | ||
| MutableStateFlow(ImagenUiState.Initial) | ||
| val uiState: StateFlow<ImagenUiState> = _uiState.asStateFlow() | ||
|
|
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| fun generateImage(inputText: String) { | ||
| _uiState.value = ImagenUiState.Loading | ||
|
|
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| viewModelScope.launch { | ||
| // Non-streaming | ||
| try { | ||
| val imageResponse = imageModel.generateImages( | ||
| inputText | ||
| ) | ||
| _uiState.value = | ||
| ImagenUiState.Success(imageResponse.images.first().asBitmap()) | ||
| } catch (e: Exception) { | ||
| _uiState.value = ImagenUiState.Error(e.localizedMessage ?: "") | ||
| } | ||
| } | ||
| } | ||
| } |
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