Android实现app分享文件到微信功能

<provider
            android:name="androidx.core.content.FileProvider"
            android:authorities="${applicationId}.fileprovider"
            android:exported="false"
            android:grantUriPermissions="true"
            tools:replace="android:authorities">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/file_paths"
                tools:replace="android:resource" />
</provider>

<paths>
    <external-path
        name="external_files"
        path="." />
</paths>

 public static final  String PACKAGE_WECHAT = "com.tencent.mm";
 
 
    public static void shareFileToWechat(Context context, File file, int thumbId) {
      if (!isInstallApp(context, ShareUtils.PACKAGE_WECHAT)) {
            Toast.makeText(context, "您需要安装微信客户端", Toast.LENGTH_LONG).show();
            return;
        }
        //构建发送文件体
        WXFileObject fileObject = new WXFileObject();
        byte[] fileBytes = readFile(file);
        //设置需要发送的文件byte[]
        fileObject.setFileData(fileBytes);
        fileObject.setFilePath(file.getAbsolutePath());
        //使用媒体消息分享
        WXMediaMessage msg = new WXMediaMessage(fileObject);
        //这个title有讲究，最好设置为带后缀的文件名，否则可能分享到微信后无法读取
        msg.title = file.getName();
        //设置显示的预览图 需小于32KB
        if (thumbId <= 0) thumbId = R.mipmap.ic_launcher;
        msg.thumbData = readBitmap(context, thumbId);
        //发送请求
        SendMessageToWX.Req req = new SendMessageToWX.Req();
        //创建唯一标识
        req.transaction = String.valueOf(System.currentTimeMillis());
        req.message = msg;
        req.scene = SendMessageToWX.Req.WXSceneSession; //WXSceneSession:分享到对话
        // 通过WXapiFactory工厂，获取IWXAPI的实例
        IWXAPI api = WXAPIFactory.createWXAPI(context, WXEntryActivity.APP_ID, true);
        // 将应用的appId注册到微信
        api.reGISterApp(WXEntryActivity.APP_ID);
        api.sendReq(req);
    }

 // 判断是否安装指定app
    public static boolean isInstallApp(Context context, String app_package) {
        final PackageManager packageManager = context.getPackageManager();
        List<PackageInfo> pInfo = packageManager.getInstalledPackages(0);
        if (pInfo != null) {
            for (int i = 0; i < pInfo.size(); i++) {
                String pn = pInfo.get(i).packageName;
                if (app_package.equals(pn)) {
                    return true;
                }
            }
        }
        return false;
    }

 
    private static byte[] readBitmap(Context context, int resourceId) {
        Bitmap bitmap = BitmapFactory.decodeResource(context.getResources(), resourceId);
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        try {
            bitmap.compress(Bitmap.CompressFORMat.PNG, 100, bos);
            return bos.toByteArray();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            closeQuietly(bos);
        }
        return null;
    }

    
    private static byte[] readFile(File file) {
        RandoMaccessFile rf = null;
        byte[] data = null;
        try {
            rf = new RandomAccessFile(file, "r");
            data = new byte[(int) rf.length()];
            rf.readFully(data);
        } catch (Exception exception) {
            exception.printStackTrace();
        } finally {
            closeQuietly(rf);
        }
        return data;
    }

    //关闭读取file
    private static void closeQuietly(Closeable closeable) {
        try {
            if (closeable != null) {
                closeable.close();
            }
        } catch (Exception exception) {
            exception.printStackTrace();
    }
}

    public static void shareWechatFriend(Context mContext, File picFile) {
     //首先判断是否安装微信
        if (isInstallApp(mContext, ShareUtils.PACKAGE_WECHAT)) {
            Intent intent = new Intent();
            intent.setPackage(PACKAGE_WECHAT);
            intent.setAction(Intent.ACTION_SEND);
            String type = "**"}
    };