chitr_MainActivity.kt

package com.divyanshu.chitr

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.divyanshu.chitr/wallpaper"
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
  }
}