我是Flutter的新手,想要更改设备的壁纸,但这需要通过平台通道进行方法调用。 https://developer.android.com/reference/android/Manifest.permission?hl=en#SET_WALLPAPER 和 本机安卓wallpaperManager
在android文件夹下的MainActivity.kt Kotlin文件中会抛出错误。
我尝试了以下操作:
- 使用MainActivity.java文件创建一个新项目
- 运行flutter clean
- 运行flutter pub cache repair
我从这里阅读了其他类型不匹配的错误问题,但不幸的是没有找到解决办法。
任何帮助都将不胜感激。 我的代码如下所示。
MainActivity.kt
package com.combasis.wallpaper_son_app
import android.os.Bundle
import io.flutter.app.FlutterActivity
import io.flutter.plugin.common.MethodChannel
import io.flutter.plugins.GeneratedPluginRegistrant
import java.io.IOException
import android.app.WallpaperManager
import android.graphics.BitmapFactory
import java.io.File
import android.os.Build
import android.annotation.TargetApi
import android.content.Context
import io.flutter.Log
private const val CHANNEL = "com.combasis.wallpaper_son_app"
class MainActivity: FlutterActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
GeneratedPluginRegistrant.registerWith(this)
MethodChannel(flutterView, CHANNEL).setMethodCallHandler { call, result ->
if (call.method == "setWallpaper") {
val arguments = call.arguments as ArrayList<*>
val setWallpaper = setWallpaper(arguments[0] as String, applicationContext, arguments[1] as Int)
if (setWallpaper == 0) {
result.success(setWallpaper)
} else {
result.error("UNAVAILABLE", "", null)
}
} else {
result.notImplemented()
}
}
}
@TargetApi(Build.VERSION_CODES.ECLAIR)
private fun setWallpaper(path: String, applicationContext: Context, wallpaperType: Int): Int {
var setWallpaper = 1
val bitmap = BitmapFactory.decodeFile(path)
val wm: WallpaperManager? = WallpaperManager.getInstance(applicationContext)
setWallpaper = try {
wm?.setBitmap(bitmap, null, true, wallpaperType)
0
} catch (e: IOException) {
1
}
return setWallpaper
}
}
主文件.dart:...
static const platform = const MethodChannel('com.combasis.wallpaper_son_app');
Future<void> _setWallpaper(int wallpaperType, String url) async {
var file =
await DefaultCacheManager().getSingleFile(url);
try {
final int result = await platform
.invokeMethod('setWallpaper', [file.path, wallpaperType]);
print('Wallpaper Updated.... $result');
} on PlatformException catch (e) {
print("Failed to Set Wallpaper: '${e.message}'.");
}
}
运行:
Launching lib/main.dart on AOSP on IA Emulator in debug mode...
Running Gradle task 'assembleDebug'...
e: /Users/username/AndroidStudioProjects/walpaperz_app/wallpaper_son_app/android/app/src/main/kotlin/com/combasis/wallpaper_son_app/MainActivity.kt: (21, 48): Type mismatch: inferred type is MainActivity but FlutterEngine was expected
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':app:compileDebugKotlin'.
> Compilation error. See log for more details
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
* Get more help at https://help.gradle.org
BUILD FAILED in 13s
Exception: Gradle task assembleDebug failed with exit code 1
-Android Studio版本:4.0.1
-Kotlin版本:1.3.72-release-Studio4.0-5稳定版
-Flutter版本:1.17.2稳定版