分享文件到微信

ShareWX.java

import com.tencent.mm.sdk.modelmsg.SendMessageToWX;
import com.tencent.mm.sdk.modelmsg.WXFileObject;
import com.tencent.mm.sdk.modelmsg.WXMediaMessage;

import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;

/**
 * Created by shibenli on 2017/4/6.
 */

public class ShareWX {

    public static void ShareFileToWeiXin(String filePath, String title) {
        WXFileObject fileObj = new WXFileObject();
        fileObj.fileData = inputStreamToByte(filePath);//文件路径
        fileObj.filePath = filePath;

        //使用媒体消息分享
        WXMediaMessage msg = new WXMediaMessage(fileObj);
        msg.title = title;

        //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;

        ShareManager.getInstance().sendReq(req);
    }

    /**
     * 将输入的流转换为byte数组
     *
     * @return byte数组
     */
    public static byte[] inputStreamToByte(String path) {
        try {
            FileInputStream fis = new FileInputStream(path);
            ByteArrayOutputStream bytestream = new ByteArrayOutputStream();
            int ch;
            while ((ch = fis.read()) != -1) {
                bytestream.write(ch);
            }
            byte imgdata[] = bytestream.toByteArray();
            bytestream.close();
            return imgdata;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 根据url获取文件名称
     *
     * @param path
     * @return
     */
    public static String getFileName(String path) {
        String str;
        int pos1 = path.lastIndexOf('/');
        int pos2 = path.lastIndexOf('\\');
        int pos = Math.max(pos1, pos2);
        if (pos < 0)
            str = null;
        else
            str = path.substring(pos + 1);

        return str;
    }
}

ShareManager.getInstance() use to get the Object of IWXAPI.