android 应用实现微信好友或朋友圈分享

官方的文档连接: https://open.weixin.qq.com/cgi-bin/frame?t=resource/res_main_tmpl&lang=zh_CN

private IWXAPI api;

		// 微信注册初始化
		api = WXAPIFactory.createWXAPI(this, "wx5ce2ffa100e3f587", true);
		api.registerApp("wx5ce2ffa100e3f587");

分享到微信里边的内容，其中flag 0是朋友圈，1是好友，
分享前判断下是否有安装微信，没有就不提示用户

	private void share2weixin(int flag) {
		// Bitmap bmp = BitmapFactory.decodeResource(getResources(),
		// R.drawable.weixin_share);

		if (!api.isWXAppInstalled()) {
			Toast.makeText(WXEntryActivity.this, "您还未安装微信客户端",
					Toast.LENGTH_SHORT).show();
			return;
		}

		WXWebpageObject webpage = new WXWebpageObject();
		webpage.webpageUrl = "http://baidu.com";
		WXMediaMessage msg = new WXMediaMessage(webpage);

		msg.title = "title";
		msg.description = getResources().getString(
				R.string.app_share_weixin_txt);
		Bitmap thumb = BitmapFactory.decodeResource(getResources(),
				R.drawable.weixin_share);
		msg.setThumbImage(thumb);
		SendMessageToWX.Req req = new SendMessageToWX.Req();
		req.transaction = String.valueOf(System.currentTimeMillis());
		req.message = msg;
		req.scene = flag;
		api.sendReq(req);
	}

分享是否成功查询，可以通过IWXAPIEventHandler回调接口来处理

	@Override
	public void onReq(BaseReq arg0) {
		// TODO Auto-generated method stub

	}

	@Override
	public void onResp(BaseResp resp) {

		Log.v("caodongquan", "hello world");
		String result = "";

		switch (resp.errCode) {
		case BaseResp.ErrCode.ERR_OK:
			result = "errcode_success";
			break;
		case BaseResp.ErrCode.ERR_USER_CANCEL:
			result = "errcode_cancel";
			break;
		case BaseResp.ErrCode.ERR_AUTH_DENIED:
			result = "errcode_deny";
			break;
		default:
			result = "errcode_unknown";
			break;
		}

		// Toast.makeText(this, result, Toast.LENGTH_LONG).show();

	}

注册回调监听事件

api.handleIntent(intent, this);

注意事项:
1.必须要在你注册的包名下，再新建一个"包名.wxapi"包，新建一个WXEntryActivity类
2.keystore要配置好,具体是在"window--preferences--android--build--Custom debug keystore"选中keystore文件，然后使用签名文件打包，就行啦!