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266
.../snippets/src/main/java/com/example/compose/snippets/graphics/AdvancedGraphicsSnippets.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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| /* | ||
| * Copyright 2023 The Android Open Source Project | ||
| * | ||
| * 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 | ||
| * | ||
| * https://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.example.compose.snippets.graphics | ||
|
|
||
| import android.Manifest | ||
| import android.content.Context | ||
| import android.content.Intent | ||
| import android.content.Intent.createChooser | ||
| import android.graphics.Bitmap | ||
| import android.graphics.Picture | ||
| import android.media.MediaScannerConnection | ||
| import android.net.Uri | ||
| import android.os.Build | ||
| import android.os.Environment | ||
| import android.provider.MediaStore | ||
| import androidx.compose.foundation.Image | ||
| import androidx.compose.foundation.background | ||
| import androidx.compose.foundation.layout.Arrangement | ||
| import androidx.compose.foundation.layout.Column | ||
| import androidx.compose.foundation.layout.aspectRatio | ||
| import androidx.compose.foundation.layout.fillMaxSize | ||
| import androidx.compose.foundation.layout.padding | ||
| import androidx.compose.material.icons.Icons | ||
| import androidx.compose.material.icons.filled.Share | ||
| import androidx.compose.material3.FloatingActionButton | ||
| import androidx.compose.material3.Icon | ||
| import androidx.compose.material3.Scaffold | ||
| import androidx.compose.material3.SnackbarHost | ||
| import androidx.compose.material3.SnackbarHostState | ||
| import androidx.compose.material3.SnackbarResult | ||
| import androidx.compose.material3.Text | ||
| import androidx.compose.runtime.Composable | ||
| import androidx.compose.runtime.remember | ||
| import androidx.compose.runtime.rememberCoroutineScope | ||
| import androidx.compose.ui.Alignment | ||
| import androidx.compose.ui.Modifier | ||
| import androidx.compose.ui.draw.drawWithCache | ||
| import androidx.compose.ui.graphics.Brush | ||
| import androidx.compose.ui.graphics.Color | ||
| import androidx.compose.ui.graphics.drawscope.draw | ||
| import androidx.compose.ui.graphics.drawscope.drawIntoCanvas | ||
| import androidx.compose.ui.graphics.nativeCanvas | ||
| import androidx.compose.ui.layout.ContentScale | ||
| import androidx.compose.ui.platform.LocalContext | ||
| import androidx.compose.ui.res.painterResource | ||
| import androidx.compose.ui.tooling.preview.Preview | ||
| import androidx.compose.ui.unit.dp | ||
| import androidx.compose.ui.unit.sp | ||
| import androidx.core.content.ContextCompat.startActivity | ||
| import com.example.compose.snippets.R | ||
| import com.google.accompanist.permissions.ExperimentalPermissionsApi | ||
| import com.google.accompanist.permissions.rememberMultiplePermissionsState | ||
| import java.io.File | ||
| import kotlin.coroutines.resume | ||
| import kotlinx.coroutines.Dispatchers | ||
| import kotlinx.coroutines.launch | ||
| import kotlinx.coroutines.suspendCancellableCoroutine | ||
|
|
||
| /* | ||
| * Copyright 2022 The Android Open Source Project | ||
| * | ||
| * 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. | ||
| */ | ||
| @OptIn(ExperimentalPermissionsApi::class) | ||
| @Preview | ||
| @Composable | ||
| fun BitmapFromComposableSnippet() { | ||
| val context = LocalContext.current | ||
| val coroutineScope = rememberCoroutineScope() | ||
| val snackbarHostState = remember { SnackbarHostState() } | ||
| val picture = remember { Picture() } | ||
|
|
||
| val writeStorageAccessState = rememberMultiplePermissionsState( | ||
| if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) { | ||
| // No permissions are needed on Android 10+ to add files in the shared storage | ||
| emptyList() | ||
| } else { | ||
| listOf(Manifest.permission.WRITE_EXTERNAL_STORAGE) | ||
| } | ||
| ) | ||
| // This logic should live in your ViewModel - trigger a side effect to invoke URI sharing. | ||
| // checks permissions granted, and then saves the bitmap from a Picture that is already capturing content | ||
| // and shares it with the default share sheet. | ||
| fun shareBitmapFromComposable() { | ||
| if (writeStorageAccessState.allPermissionsGranted) { | ||
| coroutineScope.launch(Dispatchers.IO) { | ||
| val bitmap = createBitmapFromPicture(picture) | ||
| val uri = bitmap.saveToDisk(context) | ||
| shareBitmap(context, uri) | ||
| } | ||
| } else if (writeStorageAccessState.shouldShowRationale) { | ||
| coroutineScope.launch { | ||
| val result = snackbarHostState.showSnackbar( | ||
| message = "The storage permission is needed to save the image", | ||
| actionLabel = "Grant Access" | ||
| ) | ||
|
|
||
| if (result == SnackbarResult.ActionPerformed) { | ||
| writeStorageAccessState.launchMultiplePermissionRequest() | ||
| } | ||
| } | ||
| } else { | ||
| writeStorageAccessState.launchMultiplePermissionRequest() | ||
| } | ||
| } | ||
|
|
||
| Scaffold( | ||
| snackbarHost = { SnackbarHost(snackbarHostState) }, | ||
| floatingActionButton = { | ||
| FloatingActionButton(onClick = { | ||
| shareBitmapFromComposable() | ||
| }) { | ||
| Icon(Icons.Default.Share, "share") | ||
| } | ||
| } | ||
| ) { padding -> | ||
| // [START android_compose_draw_into_bitmap] | ||
| Column( | ||
| modifier = Modifier | ||
| .padding(padding) | ||
| .fillMaxSize() | ||
| .drawWithCache { | ||
| // Example that shows how to redirect rendering to an Android Picture and then | ||
| // draw the picture into the original destination | ||
| val width = this.size.width.toInt() | ||
| val height = this.size.height.toInt() | ||
|
|
||
| onDrawWithContent { | ||
| val pictureCanvas = | ||
| androidx.compose.ui.graphics.Canvas( | ||
| picture.beginRecording( | ||
| width, | ||
| height | ||
| ) | ||
| ) | ||
| draw(this, this.layoutDirection, pictureCanvas, this.size) { | ||
| this@onDrawWithContent.drawContent() | ||
| } | ||
| picture.endRecording() | ||
|
|
||
| drawIntoCanvas { canvas -> canvas.nativeCanvas.drawPicture(picture) } | ||
| } | ||
| } | ||
| ) { | ||
| ScreenContentToCapture() | ||
| } | ||
| // [END android_compose_draw_into_bitmap] | ||
| } | ||
| } | ||
|
|
||
| @Composable | ||
| private fun ScreenContentToCapture() { | ||
| Column( | ||
| horizontalAlignment = Alignment.CenterHorizontally, | ||
| verticalArrangement = Arrangement.Center, | ||
| modifier = Modifier | ||
| .fillMaxSize() | ||
| .background( | ||
| Brush.linearGradient( | ||
| listOf( | ||
| Color(0xFFF5D5C0), | ||
| Color(0xFFF8E8E3) | ||
| ) | ||
| ) | ||
| ) | ||
| ) { | ||
| Image( | ||
| painterResource(id = R.drawable.sunset), | ||
| contentDescription = null, | ||
| modifier = Modifier | ||
| .aspectRatio(1f) | ||
| .padding(32.dp), | ||
| contentScale = ContentScale.Crop | ||
| ) | ||
| Text( | ||
| "Into the Ocean depths", | ||
| fontSize = 18.sp | ||
| ) | ||
| } | ||
| } | ||
|
|
||
| private fun createBitmapFromPicture(picture: Picture): Bitmap { | ||
| // [START android_compose_draw_into_bitmap_convert_picture] | ||
| val bitmap = Bitmap.createBitmap( | ||
| picture.width, | ||
| picture.height, | ||
| Bitmap.Config.ARGB_8888 | ||
| ) | ||
|
|
||
| val canvas = android.graphics.Canvas(bitmap) | ||
| canvas.drawColor(android.graphics.Color.WHITE) | ||
| canvas.drawPicture(picture) | ||
| // [END android_compose_draw_into_bitmap_convert_picture] | ||
| return bitmap | ||
| } | ||
|
|
||
| private suspend fun Bitmap.saveToDisk(context: Context): Uri { | ||
| val file = File( | ||
| Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), | ||
| "screenshot-${System.currentTimeMillis()}.png" | ||
| ) | ||
|
|
||
| file.writeBitmap(this, Bitmap.CompressFormat.PNG, 100) | ||
|
|
||
| return scanFilePath(context, file.path) ?: throw Exception("File could not be saved") | ||
| } | ||
|
|
||
| /** | ||
| * We call [MediaScannerConnection] to index the newly created image inside MediaStore to be visible | ||
| * for other apps, as well as returning its [MediaStore] Uri | ||
| */ | ||
| private suspend fun scanFilePath(context: Context, filePath: String): Uri? { | ||
| return suspendCancellableCoroutine { continuation -> | ||
| MediaScannerConnection.scanFile( | ||
| context, | ||
| arrayOf(filePath), | ||
| arrayOf("image/png") | ||
| ) { _, scannedUri -> | ||
| if (scannedUri == null) { | ||
| continuation.cancel(Exception("File $filePath could not be scanned")) | ||
| } else { | ||
| continuation.resume(scannedUri) | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| private fun File.writeBitmap(bitmap: Bitmap, format: Bitmap.CompressFormat, quality: Int) { | ||
| outputStream().use { out -> | ||
| bitmap.compress(format, quality, out) | ||
| out.flush() | ||
| } | ||
| } | ||
|
|
||
| private fun shareBitmap(context: Context, uri: Uri) { | ||
| val intent = Intent(Intent.ACTION_SEND).apply { | ||
| type = "image/png" | ||
| putExtra(Intent.EXTRA_STREAM, uri) | ||
| addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION) | ||
| } | ||
| startActivity(context, createChooser(intent, "Share your image"), null) | ||
| } |
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