Android系统图片分享工具类

Util.startShareImage(this) //this为当前的Activity实例

 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
 <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

/**
 * 系统分享图片功能
 * Created by wiky on 2018/1/13.
 */

object Util {

 fun startShareImage(activity: Activity) {
  //过滤出需要分享到对应的平台：微信好友、朋友圈、QQ好友。 可自行修改
  val targetApp = arrayOf("com.tencent.mm.ui.tools.ShareImgUI", "com.tencent.mm.ui.tools.ShareToTimeLineUI", "com.tencent.mobileqq.activity.JumpActivity")
  /** * 分享图片 */
  val bitmap = getImageFromAssetsFile(activity, "img_share.jpg") //从assets目录中取到对应的文件，文件名自行修改
  val localImage = saveBitmap(bitmap!!, "share.jpg") //分享前，需要先将图片存在本地（记得添加权限），文件名自行修改
  val shareIntent = Intent(Intent.ACTION_SEND)
  shareIntent.type = "image/*" //设置分享内容的类型：图片
  shareIntent.putExtra(Intent.EXTRA_STREAM, localImage)
  try {
   val resInfo = activity.packageManager.queryIntentActivities(shareIntent, 0)
   if (!resInfo.isEmpty()) {
    val targetedShareIntents = ArrayList<Intent>()
    for (info in resInfo) {
     val targeted = Intent(Intent.ACTION_SEND)
     targeted.type = "image/*" //设置分享内容的类型
     val activityInfo = info.activityInfo
     //如果还需要分享至其它平台，可以打印出具体信息，然后找到对应的Activity名称，填入上面的数组中即可
//     println("package = ${activityInfo.packageName}, activity = ${activityInfo.name}")

     //进行过滤（只显示需要分享的平台）
     if (targetApp.any { it == activityInfo.name }) {
      val comp = ComponentName(activityInfo.packageName, activityInfo.name)
      targeted.component = comp
      targeted.putExtra(Intent.EXTRA_STREAM, localImage)
      targetedShareIntents.add(targeted)
     }
    }
    val chooserIntent = Intent.createChooser(targetedShareIntents.removeAt(0), "选择要分享到的平台")
    if (chooserIntent != null) {
     chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, targetedShareIntents.toTypedArray<Parcelable>())
     activity.startActivity(chooserIntent)
    }
   }
  } catch (e: Exception) {
   Log.e(StatConstants.LOG_TAG, "Unable to share image, logs : " + e.toString())
  }
 }

 /** * 从Assets中读取图片 */
 private fun getImageFromAssetsFile(context: Context, fileName: String): Bitmap? {
  var image: Bitmap? = null
  val am = context.resources.assets
  try {
   val inputStream = am.open(fileName)
   image = BitmapFactory.decodeStream(inputStream)
   inputStream.close()
  } catch (e: IOException) {
   e.printStackTrace()
  }

  return image
 }

 /** * 将图片存到本地 */
 private fun saveBitmap(bm: Bitmap, picName: String): Uri? {
  try {
   val dir = Environment.getExternalStorageDirectory().absolutePath + File.separator + picName
   val f = File(dir)
   if (!f.exists()) {
    f.parentFile.mkdirs()
    f.createNewFile()
   }
   val out = FileOutputStream(f)
   bm.compress(Bitmap.CompressFormat.JPEG, 90, out)
   out.flush()
   out.close()
   return Uri.fromFile(f)
  } catch (e: FileNotFoundException) {
   e.printStackTrace()
  } catch (e: IOException) {
   e.printStackTrace()
  }

  return null
 }

}