微信分享封装类

 发现一个微信的bug：IOS版的微信查看分享的图片可以长按弹出识别图片中的二维码提示，Android版没有，这是对Android赤裸裸的歧视啊

需要注意的一点：微信分享中涉及到图片的，一律都要压缩至120*120，否则会报错

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AlertDialog;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.RelativeLayout;
import android.widget.Toast;

import com.tencent.mm.sdk.openapi.IWXAPI;
import com.tencent.mm.sdk.openapi.SendMessageToWX;
import com.tencent.mm.sdk.openapi.WXAPIFactory;
import com.tencent.mm.sdk.openapi.WXImageObject;
import com.tencent.mm.sdk.openapi.WXMediaMessage;
import com.tencent.mm.sdk.openapi.WXTextObject;
import com.tencent.mm.sdk.openapi.WXVideoObject;
import com.tencent.mm.sdk.openapi.WXWebpageObject;
import com.tencent.mm.sdk.platformtools.Util;
import com.xuehu365.xuehu.R;
import com.xuehu365.xuehu.model.Constant;
import com.xuehu365.xuehu.model.VideoEntity;

import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;

/**
 * Created by Administrator on 2016/9/6.
 */
public class WXShareUtils {

    private static IWXAPI wxApi;
    private static RelativeLayout wx_share_friend;
    private static RelativeLayout wx_share_pengyouquan;

    private static Handler mHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            SendMessageToWX.Req req = (SendMessageToWX.Req) msg.obj;

            //调用api接口发送数据到微信
            wxApi.sendReq(req);
        }
    };

    private static void init(Context context) {
        //实例化
        wxApi = WXAPIFactory.createWXAPI(context, Constant.wxAppId);
        wxApi.registerApp(Constant.wxAppId);
        //判断是否有安装微信
        if (!wxApi.isWXAppInstalled()) {
            Toast.makeText(context, "您还未安装微信客户端", Toast.LENGTH_SHORT).show();
            return;
        }
    }

    //显示微信分享选择页面
    public static void showShareSelect(final Context context, final String title, final String description,
                                       final String icon, final String webUrl, final int contentType) {
        View view = LayoutInflater.from(context).inflate(R.layout.share_window, null);
        AlertDialog.Builder builder = new AlertDialog.Builder(context, R.style.DialogTheme);
        builder.setView(view);
        final AlertDialog shareDialog = builder.create();
        //显示在底部
        Window window = shareDialog.getWindow();
        window.setGravity(Gravity.BOTTOM);
        window.setWindowAnimations(R.style.dialog_animation);
        window.getDecorView().setPadding(0, 0, 0, 0);
        WindowManager.LayoutParams lp = window.getAttributes();
        lp.width = WindowManager.LayoutParams.MATCH_PARENT;
        lp.height = WindowManager.LayoutParams.WRAP_CONTENT;
        window.setAttributes(lp);
        shareDialog.show();

        wx_share_friend = (RelativeLayout) view.findViewById(R.id.wx_share_friend);
        wx_share_pengyouquan = (RelativeLayout) view.findViewById(R.id.wx_share_pengyouquan);

        //分享给好友
        wx_share_friend.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                switch (contentType) {
                    case Constant.wxText:
                        WXShareUtils.shareText(context, "分享", Constant.wxFriend);
                        break;
                    case Constant.wxVideo:
                        WXShareUtils.shareVideo(context, null, Constant.wxFriend);
                        break;
                    case Constant.wxWeb:
                        WXShareUtils.shareWeb(context, title, description, icon, webUrl, Constant.wxFriend);
                        break;
                }
                shareDialog.dismiss();
            }
        });

        //分享到朋友圈
        wx_share_pengyouquan.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                switch (contentType) {
                    case Constant.wxText:
                        WXShareUtils.shareText(context, "分享", Constant.wxQuan);
                        break;
                    case Constant.wxVideo:
                        WXShareUtils.shareVideo(context, null, Constant.wxQuan);
                        break;
                    case Constant.wxWeb:
                        WXShareUtils.shareWeb(context, title, description, icon, webUrl, Constant.wxQuan);
                        break;
                }
                shareDialog.dismiss();
            }
        });
    }

    /*
    分享文本
     */
    public static void shareText(Context context, String text, String type) {
        init(context);
        //初始化一个WXTextObject对象，填写分享的文本内容
        WXTextObject textObj = new WXTextObject();
        textObj.text = text;

        //用WXTextObject对象初始化一个WXMediaMessage对象
        WXMediaMessage msg = new WXMediaMessage();
        msg.mediaObject = textObj;
        msg.description = text;

        //构造一个Req
        SendMessageToWX.Req req = new SendMessageToWX.Req();
        req.transaction = buildTransaction("text");
        req.message = msg;
        if (Constant.wxFriend.equals(type)) {
            req.scene = SendMessageToWX.Req.WXSceneSession;
        } else if (Constant.wxQuan.equals(type)) {
            req.scene = SendMessageToWX.Req.WXSceneTimeline;
        }
        //调用api接口发送数据到微信
        wxApi.sendReq(req);
    }


    public static String buildTransaction(final String type) {
        return (type == null) ? String.valueOf(System.currentTimeMillis()) : type + System.currentTimeMillis();
    }

    /**
     * 图片分享
     */
    public static void shareImage(Context context, Bitmap bitmap, String type) {
        init(context);
        WXImageObject imageObj = new WXImageObject(bitmap);
        WXMediaMessage msg = new WXMediaMessage();
        msg.mediaObject = imageObj;

        Bitmap thumbBmp = Bitmap.createScaledBitmap(bitmap, 120, 120, true);
        bitmap.recycle();
        msg.thumbData = Util.bmpToByteArray(thumbBmp, true);

        SendMessageToWX.Req req = new SendMessageToWX.Req();
        req.transaction = buildTransaction("img");
        req.message = msg;
        if (Constant.wxFriend.equals(type)) {
            req.scene = SendMessageToWX.Req.WXSceneSession;
        } else if (Constant.wxQuan.equals(type)) {
            req.scene = SendMessageToWX.Req.WXSceneTimeline;
        }
        wxApi.sendReq(req);
    }

    /*
    分享视频
     */
    public static void shareVideo(final Context context, VideoEntity videoEntity, String type) {
        init(context);
        //初始化一个WXVideoObject对象，填写url
        WXVideoObject video = new WXVideoObject();
        video.videoUrl = videoEntity.getVideoVid();

        //用一个WXVideoObject对象初始化一个WXMediaMessage对象，填写标题、描述
        final WXMediaMessage msg = new WXMediaMessage(video);
        msg.title = videoEntity.getTitle();
        msg.description = videoEntity.getTitle();
        Bitmap thumb = BitmapFactory.decodeResource(context.getResources(), R.drawable.ic_logo);
        msg.thumbData = Util.bmpToByteArray(thumb, true);

        //构造一个Req
        final SendMessageToWX.Req req = new SendMessageToWX.Req();
        req.transaction = buildTransaction("video");
        req.message = msg;
        if (Constant.wxFriend.equals(type)) {
            req.scene = SendMessageToWX.Req.WXSceneSession;
        } else if (Constant.wxQuan.equals(type)) {
            req.scene = SendMessageToWX.Req.WXSceneTimeline;
        }

        //调用api接口发送数据到微信
        wxApi.sendReq(req);
    }

    /*
    分享网页
     */
    public static void shareWeb(final Context context, String title, String description, final String icon, String webUrl, String type) {
        init(context);
        //初始化一个WXWebpageObject对象，填写URL
        WXWebpageObject webpage = new WXWebpageObject();
        webpage.webpageUrl = webUrl;

        //用WXWebpageObject对象初始化一个WXMediaMessage对象，填写标题、描述
        final WXMediaMessage msg = new WXMediaMessage(webpage);
        msg.title = title;
        msg.description = description;
        //构造一个Req
        final SendMessageToWX.Req req = new SendMessageToWX.Req();
        req.transaction = buildTransaction("webpage");
        if (Constant.wxFriend.equals(type)) {
            req.scene = SendMessageToWX.Req.WXSceneSession;
        } else if (Constant.wxQuan.equals(type)) {
            req.scene = SendMessageToWX.Req.WXSceneTimeline;
        }

        new Thread(new Runnable() {
            @Override
            public void run() {
                Bitmap bitmap = loadBitmap(icon);
                Bitmap thumbBmp = Bitmap.createScaledBitmap(bitmap, 120, 120, true);
                msg.thumbData = Util.bmpToByteArray(thumbBmp, true);

                req.message = msg;
                Message message = mHandler.obtainMessage();
                message.obj = req;
                mHandler.sendMessage(message);
            }
        }).start();
    }

    //下载网络图片
    private static Bitmap loadBitmap(String icon) {
        try {
            URL url = new URL(icon);
            InputStream is = url.openStream();
            Bitmap bitmap = BitmapFactory.decodeStream(is);
            return bitmap;
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
}