Android 安卓微信分享

这是一个微信分享的代码，可以分享文字、链接、视频，如果想详细了解，请参看微信开放平台，介绍，以及
注意的事项

首先需要在微信开放平台，注册app的app_ID;

public class WechatShareUtil {
    public static final String WECHAT_APP_ID="";

}

下面是实现分享的类

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.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;

/**
 * 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(), R.mipmap.ic_launcher);
        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(), R.mipmap.ic_launcher);
        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运行主视图

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:
                WechatShareManager.ShareContentText mShareContentText = (WechatShareManager.ShareContentText) mShareManager.getShareContentText("微信文本分享");
                mShareManager.shareByWebchat(mShareContentText, WechatShareManager.WECHAT_SHARE_TYPE_FRENDS);
                break;
            case R.id.share_picture:
                WechatShareManager.ShareContentPicture mShareContentPicture = (WechatShareManager.ShareContentPicture) mShareManager.getShareContentPicture(R.drawable.share);
                mShareManager.shareByWebchat(mShareContentPicture, WechatShareManager.WECHAT_SHARE_TYPE_FRENDS);
                break;
            case R.id.share_video:
                WechatShareManager.ShareContentVideo mShareContentVideo = (WechatShareManager.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;
        }
    }
}