用微信提供的SDK来实现分享：

从http://open.weixin.qq.com下载Android相关的jar包，将libammsdk.jar加入到项目中。

微信分享的核心类，部分代码如下：

WechatShareManager.java

package com.jackie.umeng.share; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.util.Log; import android.widget.Toast; import com.tencent.mm.sdk.modelmsg.SendMessageToWX; import com.tencent.mm.sdk.modelmsg.WXImageObject; import com.tencent.mm.sdk.modelmsg.WXMediaMessage; import com.tencent.mm.sdk.modelmsg.WXTextObject; import com.tencent.mm.sdk.modelmsg.WXVideoObject; import com.tencent.mm.sdk.modelmsg.WXWebpageObject; import com.tencent.mm.sdk.openapi.IWXAPI; import com.tencent.mm.sdk.openapi.WXAPIFactory; /** * 实现微信分享功能的核心类 * @author chengcj1 * */ public class WechatShareManager { private static final int THUMB_SIZE = 150; public static final int WECHAT_SHARE_WAY_TEXT = 1; //文字 public static final int WECHAT_SHARE_WAY_PICTURE = 2; //图片 public static final int WECHAT_SHARE_WAY_WEBPAGE = 3; //链接 public static final int WECHAT_SHARE_WAY_VIDEO = 4; //视频 public static final int WECHAT_SHARE_TYPE_TALK = SendMessageToWX.Req.WXSceneSession; //会话 public static final int WECHAT_SHARE_TYPE_FRENDS = SendMessageToWX.Req.WXSceneTimeline; //朋友圈 private static WechatShareManager mInstance; private ShareContent mShareContentText, mShareContentPicture, mShareContentWebpag, mShareContentVideo; private IWXAPI mWXApi; private Context mContext; private WechatShareManager(Context context){ this.mContext = context; //初始化数据 //初始化微信分享代码 initWechatShare(context); } /** * 获取WeixinShareManager实例 * 非线程安全，请在UI线程中操作 * @return */ public static WechatShareManager getInstance(Context context){ if(mInstance == null){ mInstance = new WechatShareManager(context); } return mInstance; } private void initWechatShare(Context context){ if (mWXApi == null) { mWXApi = WXAPIFactory.createWXAPI(context, WechatShareUtil.WECHAT_APP_ID, true); } mWXApi.registerApp(WechatShareUtil.WECHAT_APP_ID); } /** * 通过微信分享 * @param shareWay 分享的方式（文本、图片、链接） * @param shareType 分享的类型（朋友圈，会话） */ public void shareByWebchat(ShareContent shareContent, int shareType){ switch (shareContent.getShareWay()) { case WECHAT_SHARE_WAY_TEXT: shareText(shareContent, shareType); break; case WECHAT_SHARE_WAY_PICTURE: sharePicture(shareContent, shareType); break; case WECHAT_SHARE_WAY_WEBPAGE: shareWebPage(shareContent, shareType); break; case WECHAT_SHARE_WAY_VIDEO: shareVideo(shareContent, shareType); break; } } private abstract class ShareContent { protected abstract int getShareWay(); protected abstract String getContent(); protected abstract String getTitle(); protected abstract String getURL(); protected abstract int getPictureResource(); } /** * 设置分享文字的内容 * @author chengcj1 * */ public class ShareContentText extends ShareContent { private String content; /** * 构造分享文字类 * @param text 分享的文字内容 */ public ShareContentText(String content){ this.content = content; } @Override protected int getShareWay() { return WECHAT_SHARE_WAY_TEXT; } @Override protected String getContent() { return content; } @Override protected String getTitle() { return null; } @Override protected String getURL() { return null; } @Override protected int getPictureResource() { return -1; } } /* * 获取文本分享对象 */ public ShareContent getShareContentText(String content) { if (mShareContentText == null) { mShareContentText = new ShareContentText(content); } return (ShareContentText) mShareContentText; } /** * 设置分享图片的内容 * @author chengcj1 * */ public class ShareContentPicture extends ShareContent { private int pictureResource; public ShareContentPicture(int pictureResource){ this.pictureResource = pictureResource; } @Override protected int getShareWay() { return WECHAT_SHARE_WAY_PICTURE; } @Override protected int getPictureResource() { return pictureResource; } @Override protected String getContent() { return null; } @Override protected String getTitle() { return null; } @Override protected String getURL() { return null; } } /* * 获取图片分享对象 */ public ShareContent getShareContentPicture(int pictureResource) { if (mShareContentPicture == null) { mShareContentPicture = new ShareContentPicture(pictureResource); } return (ShareContentPicture) mShareContentPicture; } /** * 设置分享链接的内容 * @author chengcj1 * */ public class ShareContentWebpage extends ShareContent { private String title; private String content; private String url; private int pictureResource; public ShareContentWebpage(String title, String content, String url, int pictureResource){ this.title = title; this.content = content; this.url = url; this.pictureResource = pictureResource; } @Override protected int getShareWay() { return WECHAT_SHARE_WAY_WEBPAGE; } @Override protected String getContent() { return content; } @Override protected String getTitle() { return title; } @Override protected String getURL() { return url; } @Override protected int getPictureResource() { return pictureResource; } } /* * 获取网页分享对象 */ public ShareContent getShareContentWebpag(String title, String content, String url, int pictureResource) { if (mShareContentWebpag == null) { mShareContentWebpag = new ShareContentWebpage(title, content, url, pictureResource); } return (ShareContentWebpage) mShareContentWebpag; } /** * 设置分享视频的内容 * @author chengcj1 * */ public class ShareContentVideo extends ShareContent { private String url; public ShareContentVideo(String url) { this.url = url; } @Override protected int getShareWay() { return WECHAT_SHARE_WAY_VIDEO; } @Override protected String getContent() { return null; } @Override protected String getTitle() { return null; } @Override protected String getURL() { return url; } @Override protected int getPictureResource() { return -1; } } /* * 获取视频分享内容 */ public ShareContent getShareContentVideo(String url) { if (mShareContentVideo == null) { mShareContentVideo = new ShareContentVideo(url); } return (ShareContentVideo) mShareContentVideo; } /* * 分享文字 */ private void shareText(ShareContent shareContent, int shareType) { String text = shareContent.getContent(); //初始化一个WXTextObject对象 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(); //transaction字段用于唯一标识一个请求 req.transaction = buildTransaction("textshare"); req.message = msg; //发送的目标场景， 可以选择发送到会话 WXSceneSession 或者朋友圈 WXSceneTimeline。 默认发送到会话。 req.scene = shareType; mWXApi.sendReq(req); } /* * 分享图片 */ private void sharePicture(ShareContent shareContent, int shareType) { Bitmap bitmap = BitmapFactory.decodeResource(mContext.getResources(), shareContent.getPictureResource()); WXImageObject imgObj = new WXImageObject(bitmap); WXMediaMessage msg = new WXMediaMessage(); msg.mediaObject = imgObj; Bitmap thumbBitmap = Bitmap.createScaledBitmap(bitmap, THUMB_SIZE, THUMB_SIZE, true); bitmap.recycle(); msg.thumbData = Util.bmpToByteArray(thumbBitmap, true); //设置缩略图 SendMessageToWX.Req req = new SendMessageToWX.Req(); req.transaction = buildTransaction("imgshareappdata"); req.message = msg; req.scene = shareType; mWXApi.sendReq(req); } /* * 分享链接 */ private void shareWebPage(ShareContent shareContent, int shareType) { WXWebpageObject webpage = new WXWebpageObject(); webpage.webpageUrl = shareContent.getURL(); WXMediaMessage msg = new WXMediaMessage(webpage); msg.title = shareContent.getTitle(); msg.description = shareContent.getContent(); Bitmap thumb = BitmapFactory.decodeResource(mContext.getResources(), shareContent.getPictureResource()); if(thumb == null) { Toast.makeText(mContext, "图片不能为空", Toast.LENGTH_SHORT).show(); } else { msg.thumbData = Util.bmpToByteArray(thumb, true); } SendMessageToWX.Req req = new SendMessageToWX.Req(); req.transaction = buildTransaction("webpage"); req.message = msg; req.scene = shareType; mWXApi.sendReq(req); } /* * 分享视频 */ private void shareVideo(ShareContent shareContent, int shareType) { WXVideoObject video = new WXVideoObject(); video.videoUrl = shareContent.getURL(); WXMediaMessage msg = new WXMediaMessage(video); msg.title = shareContent.getTitle(); msg.description = shareContent.getContent(); Bitmap thumb = BitmapFactory.decodeResource(mContext.getResources(), R.drawable.send_music_thumb); // BitmapFactory.decodeStream(new URL(video.videoUrl).openStream()); /** * 测试过程中会出现这种情况，会有个别手机会出现调不起微信客户端的情况。造成这种情况的原因是微信对缩略图的大小、title、description等参数的大小做了限制，所以有可能是大小超过了默认的范围。 * 一般情况下缩略图超出比较常见。Title、description都是文本，一般不会超过。 */ Bitmap thumbBitmap = Bitmap.createScaledBitmap(thumb, THUMB_SIZE, THUMB_SIZE, true); thumb.recycle(); msg.thumbData = Util.bmpToByteArray(thumbBitmap, true); SendMessageToWX.Req req = new SendMessageToWX.Req(); req.transaction = buildTransaction("video"); req.message = msg; req.scene = shareType; mWXApi.sendReq(req); } private String buildTransaction(final String type) { return (type == null) ? String.valueOf(System.currentTimeMillis()) : type + System.currentTimeMillis(); } }

MainActivity.java

package com.jackie.umeng.share; import com.jackie.umeng.share.WechatShareManager.ShareContentPicture; import com.jackie.umeng.share.WechatShareManager.ShareContentText; import com.jackie.umeng.share.WechatShareManager.ShareContentVideo; import android.app.Activity; import android.content.Context; import android.content.pm.PackageManager; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.Toast; public class MainActivity extends Activity implements OnClickListener { private Button mShareText, mSharePicture, mShareVideo; private WechatShareManager mShareManager; private Context mContext; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mShareText = (Button) findViewById(R.id.share_text); mSharePicture = (Button) findViewById(R.id.share_picture); mShareVideo = (Button) findViewById(R.id.share_video); mShareText.setOnClickListener(this); mSharePicture.setOnClickListener(this); mShareVideo.setOnClickListener(this); mContext = this; mShareManager = WechatShareManager.getInstance(mContext); } @Override public void onClick(View v) { if (!isWebchatAvaliable()) { Toast.makeText(mContext, "请先安装微信", Toast.LENGTH_LONG).show(); return; } switch (v.getId()) { case R.id.share_text: ShareContentText mShareContentText = (ShareContentText) mShareManager.getShareContentText("微信文本分享"); mShareManager.shareByWebchat(mShareContentText, WechatShareManager.WECHAT_SHARE_TYPE_FRENDS); break; case R.id.share_picture: ShareContentPicture mShareContentPicture = (ShareContentPicture) mShareManager.getShareContentPicture(R.drawable.share); mShareManager.shareByWebchat(mShareContentPicture, WechatShareManager.WECHAT_SHARE_TYPE_FRENDS); break; case R.id.share_video: ShareContentVideo mShareContentVideo = (ShareContentVideo) mShareManager.getShareContentVideo("http://baidu.hz.letv.com/kan/agSlT?fr=v.baidu.com/"); mShareManager.shareByWebchat(mShareContentVideo, WechatShareManager.WECHAT_SHARE_TYPE_FRENDS); break; default: break; } } private boolean isWebchatAvaliable() { //检测手机上是否安装了微信 try { getPackageManager().getPackageInfo("com.tencent.mm", PackageManager.GET_ACTIVITIES); return true; } catch (Exception e) { return false; } } }

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