support share image via FileProvider

android/src/main/AndroidManifest.xml

 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-  package="com.jarvan.fluwx">
+    package="com.jarvan.fluwx">
 
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
     <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
-    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
 
     <application>
         <activity
@@ -39,5 +39,15 @@
                 <data android:scheme="sdksample" />
             </intent-filter>
         </activity-alias>
+
+        <provider
+            android:name="com.jarvan.fluwx.FluwxFileProvider"
+            android:authorities="${applicationId}.fluwxprovider"
+            android:exported="false"
+            android:grantUriPermissions="true">
+            <meta-data
+                android:name="android.support.FILE_PROVIDER_PATHS"
+                android:resource="@xml/fluwx_file_provider_paths" />
+        </provider>
     </application>
 </manifest>

android/src/main/kotlin/com/jarvan/fluwx/FluwxFileProvider.kt

+package com.jarvan.fluwx
+
+import androidx.core.content.FileProvider
+
+/***
+ * Created by mo on 2020/5/13
+ * 冷风如刀，以大地为砧板，视众生为鱼肉。
+ * 万里飞雪，将穹苍作烘炉，熔万物为白银。
+ **/
+class FluwxFileProvider: FileProvider()
\ No newline at end of file

android/src/main/kotlin/com/jarvan/fluwx/handlers/FluwxShareHandler.kt

@@ -2,15 +2,15 @@ package com.jarvan.fluwx.handlers
 
 import android.Manifest
 import android.content.Context
+import android.content.Intent
 import android.content.pm.PackageManager
 import android.content.res.AssetFileDescriptor
 import android.net.Uri
 import android.text.TextUtils
+import android.util.Log
 import androidx.core.content.ContextCompat
-import com.jarvan.fluwx.io.ImagesIO
-import com.jarvan.fluwx.io.ImagesIOIml
-import com.jarvan.fluwx.io.WeChatImage
-import com.jarvan.fluwx.io.toExternalCacheFile
+import androidx.core.content.FileProvider
+import com.jarvan.fluwx.io.*
 import com.tencent.mm.opensdk.modelbase.BaseReq
 import com.tencent.mm.opensdk.modelmsg.*
 import io.flutter.embedding.engine.plugins.FlutterPlugin
@@ -18,16 +18,17 @@ import io.flutter.plugin.common.MethodCall
 import io.flutter.plugin.common.MethodChannel
 import io.flutter.plugin.common.PluginRegistry
 import kotlinx.coroutines.*
+import java.io.File
 import java.util.*
 import kotlin.coroutines.CoroutineContext
 
+
 /***
  * Created by mo on 2020/3/6
  * 冷风如刀，以大地为砧板，视众生为鱼肉。
  * 万里飞雪，将穹苍作烘炉，熔万物为白银。
  **/
 internal class FluwxShareHandlerEmbedding(private val flutterAssets: FlutterPlugin.FlutterAssets, override val context: Context) : FluwxShareHandler {
-
     override val assetFileDescriptor: (String) -> AssetFileDescriptor = {
         val uri = Uri.parse(it)
         val packageName = uri.getQueryParameter("package")
@@ -135,10 +136,14 @@ internal interface FluwxShareHandler : CoroutineScope {
                 }
                 sourceByteArray.size > 512 * 1024 -> {
                     WXImageObject().apply {
-                        if (ContextCompat.checkSelfPermission(context, Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
-                            setImagePath(sourceByteArray.toExternalCacheFile(context, sourceImage.suffix)?.absolutePath)
+                        if (supportFileProvider && targetHigherThanN) {
+                            setImagePath(getFileContentUri(sourceByteArray.toCacheFile(context, sourceImage.suffix)))
                         } else {
-                            permissionHandler?.requestStoragePermission()
+                            if (ContextCompat.checkSelfPermission(context, Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
+                                setImagePath(sourceByteArray.toExternalCacheFile(context, sourceImage.suffix)?.absolutePath)
+                            } else {
+                                permissionHandler?.requestStoragePermission()
+                            }
                         }
                     }
                 }
@@ -150,7 +155,7 @@ internal interface FluwxShareHandler : CoroutineScope {
             msg.mediaObject = imageObject
             msg.thumbData = thumbData
 
-            msg.description = call.argument<String>(keyDescription)
+            msg.description = call.argument(keyDescription)
 
             val req = SendMessageToWX.Req()
             setCommonArguments(call, req, msg)
@@ -261,11 +266,11 @@ internal interface FluwxShareHandler : CoroutineScope {
 
     //    SESSION, TIMELINE, FAVORITE
     private fun setCommonArguments(call: MethodCall, req: SendMessageToWX.Req, msg: WXMediaMessage) {
-        msg.messageAction = call.argument<String?>("messageAction")
-        msg.messageExt = call.argument<String?>("messageExt")
-        msg.mediaTagName = call.argument<String?>("mediaTagName")
-        msg.title = call.argument<String?>(keyTitle)
-        msg.description = call.argument<String?>(keyDescription)
+        msg.messageAction = call.argument("messageAction")
+        msg.messageExt = call.argument("messageExt")
+        msg.mediaTagName = call.argument("mediaTagName")
+        msg.title = call.argument(keyTitle)
+        msg.description = call.argument(keyDescription)
         req.transaction = UUID.randomUUID().toString().replace("-", "")
         val sceneIndex = call.argument<Int?>("scene")
         req.scene = when (sceneIndex) {
@@ -276,6 +281,25 @@ internal interface FluwxShareHandler : CoroutineScope {
         }
     }
 
+    private fun getFileContentUri(file: File?): String? {
+        if (file == null || !file.exists())
+            return null
+
+        val contentUri = FileProvider.getUriForFile(context,
+                "${context.packageName}.fluwxprovider",  // 要与`AndroidManifest.xml`里配置的`authorities`一致，假设你的应用包名为com.example.app
+                file)
+
+        // 授权给微信访问路径
+        context.grantUriPermission("com.tencent.mm",  // 这里填微信包名
+                contentUri, Intent.FLAG_GRANT_READ_URI_PERMISSION)
+
+        return contentUri.toString() // contentUri.toString() 即是以"content://"开头的用于共享的路径
+
+    }
+
+    private val supportFileProvider: Boolean get() = WXAPiHandler.wxApi?.wxAppSupportAPI ?: 0 >= 0x27000D00
+    private val targetHigherThanN: Boolean get() = android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.N
+
     val context: Context
 
     val assetFileDescriptor: (String) -> AssetFileDescriptor
@@ -288,4 +312,5 @@ internal interface FluwxShareHandler : CoroutineScope {
     var permissionHandler: PermissionHandler?
 
     fun onDestroy() = job.cancel()
-}
+}
\ No newline at end of file
+

android/src/main/kotlin/com/jarvan/fluwx/io/FileIO.kt

+package com.jarvan.fluwx.io
+
+import android.content.Context
+import android.util.Log
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+import okio.*
+import java.io.*
+import java.util.*
+
+/***
+ * Created by mo on 2020/5/13
+ * 冷风如刀，以大地为砧板，视众生为鱼肉。
+ * 万里飞雪，将穹苍作烘炉，熔万物为白银。
+ **/
+
+private const val cachePathName = "fluwxSharedData"
+
+internal suspend fun ByteArray.toExternalCacheFile(context: Context, suffix: String): File? {
+    var file: File? = null
+    val externalFile = context.externalCacheDir ?: return file
+    val dir = File(externalFile.absolutePath + File.separator + cachePathName).apply {
+        if (!exists()) {
+            mkdirs()
+        }
+    }
+    file = File(dir.absolutePath + File.separator + UUID.randomUUID().toString() + suffix)
+    return saveToLocal(this, file)
+}
+
+internal suspend fun ByteArray.toCacheFile(context: Context, suffix: String): File? {
+    var file: File? = null
+    val externalFile = context.cacheDir ?: return file
+    val dir = File(externalFile.absolutePath + File.separator + cachePathName).apply {
+        if (!exists()) {
+            mkdirs()
+        }
+    }
+    file = File(dir.absolutePath + File.separator + UUID.randomUUID().toString() + suffix)
+
+    return saveToLocal(this, file)
+}
+
+private suspend fun saveToLocal(byteArray: ByteArray, file: File): File? {
+    return withContext(Dispatchers.IO) {
+
+        var sink: BufferedSink? = null
+        var source: Source? = null
+        var outputStream: OutputStream? = null
+
+        try {
+
+
+            outputStream = FileOutputStream(file)
+            sink = outputStream.sink().buffer()
+            source = ByteArrayInputStream(byteArray).source()
+            sink.writeAll(source)
+            sink.flush()
+
+        } catch (e: IOException) {
+            Log.w("Fluwx", "failed to create cache files")
+        } finally {
+            sink?.close()
+            source?.close()
+            outputStream?.close()
+        }
+
+        file
+    }
+}

android/src/main/kotlin/com/jarvan/fluwx/io/ImagesIO.kt

@@ -119,37 +119,3 @@ interface ImagesIO {
     suspend fun readByteArray(): ByteArray
     suspend fun compressedByteArray(context: Context, maxSize: Int): ByteArray
 }
-
-internal suspend fun ByteArray.toExternalCacheFile(context: Context, suffix: String): File? {
-    val byteArray = this
-    return withContext(Dispatchers.IO) {
-
-        var file: File? = null
-
-        var sink: BufferedSink? = null
-        var source: Source? = null
-        var outputStream: OutputStream? = null
-
-        try {
-
-            val externalFile = context.externalCacheDir ?: return@withContext file
-            file = File(externalFile.absolutePath + File.separator + UUID.randomUUID().toString() + suffix)
-
-            outputStream = FileOutputStream(file)
-            sink = outputStream.sink().buffer()
-            source = ByteArrayInputStream(byteArray).source()
-            sink.writeAll(source)
-            sink.flush()
-
-        } catch (e: IOException) {
-            Log.w("Fluwx", "failed to create external files")
-        } finally {
-            sink?.close()
-            source?.close()
-            outputStream?.close()
-        }
-
-        file
-    }
-
-}
\ No newline at end of file

android/src/main/res/xml/fluwx_file_provider_paths.xml

+<?xml version="1.0" encoding="utf-8"?>
+<paths xmlns:android="http://schemas.android.com/apk/res/android">
+    <cache-path name="fluwxSharedData" path="fluwxSharedData/"/>
+</paths>
\ No newline at end of file