Android微信SDK实现分享

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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