raystatic
6 days ago
parent
7d45eae4f8
commit
fb4a0b25f6
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<?xml version="1.0" encoding="utf-8"?>
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<!--
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~ Copyright 2026 The Android Open Source Project
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~
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~ Licensed under the Apache License, Version 2.0 (the "License");
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~ you may not use this file except in compliance with the License.
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~ You may obtain a copy of the License at
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~
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~ https://www.apache.org/licenses/LICENSE-2.0
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~
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~ Unless required by applicable law or agreed to in writing, software
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~ distributed under the License is distributed on an "AS IS" BASIS,
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~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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~ See the License for the specific language governing permissions and
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~ limitations under the License.
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-->
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<paths>
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<cache-path name="my_cache" path="." />
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<external-path name="my_external" path="." />
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<cache-path name="shared_images" path="shared_images/" />
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</paths>
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<manifest xmlns:android="http://schemas.android.com/apk/res/android">
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<application>
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<activity
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android:name="com.google.samples.apps.nowinandroid.feature.interests.impl.filter.FilterActivity"
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android:exported="false"
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android:theme="@android:style/Theme.Material.Light.NoActionBar"
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android:windowSoftInputMode="adjustResize" />
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</application>
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</manifest>
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@ -0,0 +1,201 @@
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/*
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* Copyright 2026 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.samples.apps.nowinandroid.feature.interests.impl.filter
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import android.graphics.Bitmap
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import android.os.Bundle
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import androidx.activity.ComponentActivity
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import androidx.activity.compose.setContent
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import androidx.activity.enableEdgeToEdge
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import androidx.compose.foundation.Image
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import androidx.compose.foundation.background
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import androidx.compose.foundation.border
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import androidx.compose.foundation.clickable
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import androidx.compose.foundation.layout.Arrangement
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import androidx.compose.foundation.layout.Box
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import androidx.compose.foundation.layout.Column
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import androidx.compose.foundation.layout.Spacer
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import androidx.compose.foundation.layout.fillMaxSize
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import androidx.compose.foundation.layout.fillMaxWidth
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import androidx.compose.foundation.layout.height
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import androidx.compose.foundation.layout.padding
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import androidx.compose.foundation.layout.size
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import androidx.compose.foundation.lazy.LazyRow
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import androidx.compose.foundation.lazy.items
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import androidx.compose.foundation.rememberScrollState
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import androidx.compose.foundation.shape.RoundedCornerShape
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import androidx.compose.foundation.verticalScroll
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import androidx.compose.material3.Button
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import androidx.compose.material3.MaterialTheme
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import androidx.compose.material3.Scaffold
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import androidx.compose.material3.Surface
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import androidx.compose.material3.Text
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import androidx.compose.runtime.Composable
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import androidx.compose.runtime.getValue
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import androidx.compose.runtime.mutableStateOf
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import androidx.compose.runtime.remember
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import androidx.compose.runtime.setValue
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import androidx.compose.ui.Alignment
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import androidx.compose.ui.Modifier
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import androidx.compose.ui.draw.clip
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import androidx.compose.ui.graphics.Color
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import androidx.compose.ui.graphics.ImageBitmap
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import androidx.compose.ui.graphics.asImageBitmap
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import androidx.compose.ui.layout.ContentScale
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import androidx.compose.ui.platform.LocalContext
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import androidx.compose.ui.text.font.FontWeight
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import androidx.compose.ui.unit.dp
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import com.google.samples.apps.nowinandroid.core.designsystem.theme.NiaTheme
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internal const val IO_CONNECT_WORKSHOP_TOPIC_NAME = "IO connect Workshop"
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class FilterActivity : ComponentActivity() {
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override fun onCreate(savedInstanceState: Bundle?) {
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super.onCreate(savedInstanceState)
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enableEdgeToEdge()
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setContent {
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NiaTheme {
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Scaffold(
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modifier = Modifier.fillMaxSize(),
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) { innerPadding ->
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Column(
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modifier = Modifier.padding(innerPadding).padding(top = 40.dp, bottom = 16.dp, start = 16.dp, end = 16.dp),
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horizontalAlignment = Alignment.CenterHorizontally
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) {
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Text(
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text = "Apply Filters Use Case",
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style = MaterialTheme.typography.titleLarge,
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color = MaterialTheme.colorScheme.onErrorContainer,
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fontWeight = FontWeight.Bold
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)
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Spacer(modifier = Modifier.height(12.dp))
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FilterScreen(
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modifier = Modifier
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.fillMaxSize()
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)
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}
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}
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}
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}
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}
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}
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@Composable
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fun FilterScreen(modifier: Modifier = Modifier) {
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val context = LocalContext.current
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var selectedFilter by remember { mutableStateOf(FILTERS.first()) }
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val sourceBitmap = remember { decodeSourceBitmap(context) }
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val previewBitmap = createFilteredBitmap(sourceBitmap, selectedFilter)
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Column(
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modifier = modifier
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.fillMaxSize()
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.verticalScroll(rememberScrollState())
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.padding(16.dp),
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horizontalAlignment = Alignment.CenterHorizontally
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) {
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Text(
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text = "Preview: ${selectedFilter.name}",
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style = MaterialTheme.typography.titleMedium,
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fontWeight = FontWeight.SemiBold
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)
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Spacer(modifier = Modifier.height(12.dp))
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Image(
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bitmap = previewBitmap.asImageBitmap(),
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contentDescription = "Filtered Preview (${selectedFilter.name})",
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modifier = Modifier
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.size(300.dp)
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.clip(RoundedCornerShape(12.dp))
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.background(Color.LightGray),
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contentScale = ContentScale.Crop
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)
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Spacer(modifier = Modifier.height(12.dp))
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LazyRow(horizontalArrangement = Arrangement.spacedBy(12.dp)) {
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items(FILTERS, key = { it.name }) { filter ->
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val thumbnail = createFilteredBitmap(sourceBitmap, filter)
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FilterThumbnail(
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image = thumbnail.asImageBitmap(),
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name = filter.name,
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selected = filter == selectedFilter,
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onClick = { selectedFilter = filter}
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)
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}
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}
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Spacer(modifier = Modifier.height(24.dp))
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Button(
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onClick = {
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val sharableBitmap = createFilteredBitmap(sourceBitmap, selectedFilter)
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shareBitmap(context, sharableBitmap, selectedFilter.name)
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},
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modifier = Modifier.fillMaxWidth()
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) {
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Text(text = "Share filtered Image")
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}
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Spacer(modifier = Modifier.height(16.dp))
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}
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}
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@Composable
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fun FilterThumbnail(
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image: ImageBitmap,
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name: String,
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selected: Boolean,
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onClick: () -> Unit
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) {
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Column(
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horizontalAlignment = Alignment.CenterHorizontally,
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modifier = Modifier.clickable(onClick = onClick)
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) {
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Box(
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modifier = Modifier
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.size(84.dp)
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.clip(RoundedCornerShape(8.dp))
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.border(
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width = if (selected) 3.dp else 1.dp,
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color = if (selected) MaterialTheme.colorScheme.primary else Color.Gray,
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shape = RoundedCornerShape(8.dp)
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)
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) {
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Image(
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bitmap = image,
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contentDescription = name,
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modifier = Modifier.fillMaxSize(),
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contentScale = ContentScale.Crop
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)
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}
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Spacer(modifier = Modifier.height(4.dp))
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Text(
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text = name,
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style = MaterialTheme.typography.labelMedium,
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fontWeight = if (selected) FontWeight.Bold else FontWeight.Normal
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)
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}
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}
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@ -0,0 +1,126 @@
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/*
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* Copyright 2026 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.samples.apps.nowinandroid.feature.interests.impl.filter
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import android.content.Context
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import android.content.Intent
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import android.graphics.Bitmap
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import android.graphics.BitmapFactory
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import android.graphics.Canvas
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import android.graphics.ColorMatrix
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import android.graphics.ColorMatrixColorFilter
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import android.graphics.Paint
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import androidx.core.content.FileProvider
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import com.google.samples.apps.nowinandroid.feature.interests.impl.R
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import java.io.File
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import java.io.FileOutputStream
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class ImageFilter(
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val name: String,
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val matrix: FloatArray
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)
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val FILTERS = listOf(
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ImageFilter(
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"Original", floatArrayOf(
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1f, 0f, 0f, 0f, 0f,
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0f, 1f, 0f, 0f, 0f,
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0f, 0f, 1f, 0f, 0f,
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0f, 0f, 0f, 1f, 0f
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)
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),
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ImageFilter(
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"Grayscale", floatArrayOf(
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0.299f, 0.587f, 0.114f, 0f, 0f,
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0.299f, 0.587f, 0.114f, 0f, 0f,
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0.299f, 0.587f, 0.114f, 0f, 0f,
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0f, 0f, 0f, 1f, 0f
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)
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),
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ImageFilter(
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"Sepia", floatArrayOf(
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0.393f, 0.769f, 0.189f, 0f, 0f,
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0.349f, 0.686f, 0.168f, 0f, 0f,
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0.272f, 0.534f, 0.131f, 0f, 0f,
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0f, 0f, 0f, 1f, 0f
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)
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),
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ImageFilter(
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"Invert", floatArrayOf(
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-1f, 0f, 0f, 0f, 255f,
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0f, -1f, 0f, 0f, 255f,
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0f, 0f, -1f, 0f, 255f,
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0f, 0f, 0f, 1f, 0f
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)
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),
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ImageFilter(
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"Warm", floatArrayOf(
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1.15f, 0f, 0f, 0f, 10f,
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0f, 1.05f, 0f, 0f, 5f,
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0f, 0f, 0.85f, 0f, 0f,
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0f, 0f, 0f, 1f, 0f
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)
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),
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ImageFilter(
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"Cool", floatArrayOf(
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0.85f, 0f, 0f, 0f, 0f,
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0f, 1f, 0f, 0f, 0f,
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0f, 0f, 1.15f, 0f, 10f,
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0f, 0f, 0f, 1f, 0f
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)
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),
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ImageFilter(
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"Contrast", floatArrayOf(
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1.5f, 0f, 0f, 0f, -64f,
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0f, 1.5f, 0f, 0f, -64f,
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0f, 0f, 1.5f, 0f, -64f,
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0f, 0f, 0f, 1f, 0f
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)
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)
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)
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fun decodeSourceBitmap(context: Context): Bitmap {
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val options = BitmapFactory.Options().apply { inSampleSize = 4 }
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return BitmapFactory.decodeResource(context.resources, R.drawable.large_image, options)
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}
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fun createFilteredBitmap(source: Bitmap, filter: ImageFilter): Bitmap {
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val result = Bitmap.createBitmap(source.width, source.height, Bitmap.Config.ARGB_8888)
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val canvas = Canvas(result)
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val paint = Paint(Paint.FILTER_BITMAP_FLAG).apply {
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colorFilter = ColorMatrixColorFilter(ColorMatrix(filter.matrix))
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}
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canvas.drawBitmap(source, 0f, 0f, paint)
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return result
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}
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fun shareBitmap(context: Context, bitmap: Bitmap, filterName: String) {
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val shareDir = File(context.cacheDir, "shared_images").apply { mkdirs() }
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val file = File(shareDir, "filtered_${filterName.lowercase()}.png")
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FileOutputStream(file).use { stream ->
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bitmap.compress(Bitmap.CompressFormat.PNG, 100, stream)
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}
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val uri = FileProvider.getUriForFile(context, "${context.packageName}.fileprovider", file)
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val intent = Intent(Intent.ACTION_SEND).apply {
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type = "image/png"
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putExtra(Intent.EXTRA_STREAM, uri)
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addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
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}
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context.startActivity(Intent.createChooser(intent, "Share filtered image"))
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}
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After Width: | Height: | Size: 117 KiB |
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