废话概要：

1.想要接入微信的接口，首先你的有一个微信开发者账号微信开发者平台
2.管理中心->创建移动应用->提交App应用详情->审核->审核通过->获取APP SECRET

注意：

在创建移动应用时需要提交签名，签名获取方法如下：
安装签名生成工具，输入在App包名，点击Get Singnature即可

微信提供的参考资源：

参考代码
语音SDK+Demo+开发文档
图像SDK+Demo+开发文档
卡券SDK+开发文档

开始撸码：

1、导包：

在build.gradle文件中，添加如下依赖即可：

dependencies {
        compile 'com.tencent.mm.opensdk:wechat-sdk-android-with-mta:+'}

2、创建微信管理类：

public class WXshare {


public static final String APP_ID = "wx4656bd61a787****";
public static final String ACTION_SHARE_RESPONSE = "action_wx_share_response";
public static final String EXTRA_RESULT = "result";

private final Context context;
private final IWXAPI api;//个对象是专门用来向微信发送数据的一个重要接口,使用强引用持有,所有的信息发送都是基于这个对象的
private OnResponseListener listener;
private ResponseReceiver receiver;

public WXshare(Context context) {
    api = WXAPIFactory.createWXAPI(context, APP_ID);
    this.context = context;
}

public WXshare register() {
    // 向微信注册你的App
    api.registerApp(APP_ID);
    receiver = new ResponseReceiver();
    IntentFilter filter = new IntentFilter(ACTION_SHARE_RESPONSE);
    context.registerReceiver(receiver, filter);
    return this;
}

public void unregister() {
   // 向微信注销你的App
    try {
        api.unregisterApp();
        context.unregisterReceiver(receiver);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

public WXshare shareText(String text) {
    //向微信分享文字
    WXTextObject textObj = new WXTextObject();
    textObj.text = text;

    WXMediaMessage msg = new WXMediaMessage();
    msg.mediaObject = textObj;
   
    msg.description = text;

    SendMessageToWX.Req req = new SendMessageToWX.Req();
    req.transaction = buildTransaction("text");
    req.message = msg;
    req.scene = SendMessageToWX.Req.WXSceneSession;

    boolean result = api.sendReq(req);
    return this;
}


public WXshare shareUrl(int flag,Context context,String url,String title,String descroption){
    //flag:0代表分享到微信好友，1代表分享到朋友圈
    //初始化一个WXWebpageObject填写url
    WXWebpageObject webpageObject = new WXWebpageObject();
    webpageObject.webpageUrl = url;
    //用WXWebpageObject对象初始化一个WXMediaMessage，天下标题，描述
    WXMediaMessage msg = new WXMediaMessage(webpageObject);
    msg.title = title;
    msg.description = descroption;
    //这块需要注意，图片的像素千万不要太大，不然的话会调不起来微信分享，或者直接参考下文的sharePicture
  Bitmap thumb = BitmapFactory.decodeResource(context.getResources(), R.mipmap.ic_logo);
    msg.setThumbImage(thumb);
    SendMessageToWX.Req req = new SendMessageToWX.Req();
    req.transaction = String.valueOf(System.currentTimeMillis());
    req.message = msg;
    req.scene = flag==0?SendMessageToWX.Req.WXSceneSession:SendMessageToWX.Req.WXSceneTimeline;
    api.sendReq(req);
    return this;
}

public void sharePicture(Bitmap bitmap, int shareType) {
    
    //分享图片
    //flag:0代表分享到微信好友，1代表分享到朋友圈
    WXImageObject imgObj = new WXImageObject(bitmap);

    WXMediaMessage msg = new WXMediaMessage();
    msg.mediaObject = imgObj;

    Bitmap thumbBitmap =  Bitmap.createScaledBitmap(bitmap, 120, 120, true);
    bitmap.recycle();

    ByteArrayOutputStream stream = new ByteArrayOutputStream();
    thumbBitmap.compress(Bitmap.CompressFormat.PNG, 100, stream);
    byte[] byteArray = stream.toByteArray();
    msg.thumbData = byteArray;  //设置缩略图

    SendMessageToWX.Req req = new SendMessageToWX.Req();
    req.transaction = buildTransaction("imgshareappdata");
    req.message = msg;
    req.scene = shareType;
    api.sendReq(req);
}



public static byte[] bmpToByteArray(final Bitmap bmp, final boolean needRecycle) {
    ByteArrayOutputStream output = new ByteArrayOutputStream();
    bmp.compress(Bitmap.CompressFormat.PNG, 100, output);
    if (needRecycle) {
        bmp.recycle();
    }

    byte[] result = output.toByteArray();
    try {
        output.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
    return result;
}

public IWXAPI getApi() {
    return api;
}

public void setListener(OnResponseListener listener) {
    this.listener = listener;
}

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

private class ResponseReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        Response response = intent.getParcelableExtra(EXTRA_RESULT);
        String result;
        if (listener != null) {
            if (response.errCode == BaseResp.ErrCode.ERR_OK) {
                listener.onSuccess();
            } else if (response.errCode == BaseResp.ErrCode.ERR_USER_CANCEL) {
                listener.onCancel();
            } else {
                switch (response.errCode) {
                    case BaseResp.ErrCode.ERR_AUTH_DENIED:
                        result = "发送被拒绝";
                        break;
                    case BaseResp.ErrCode.ERR_UNSUPPORT:
                        result = "不支持错误";
                        break;
                    default:
                        result = "发送返回";
                        break;
                }
                listener.onFail(result);
            }
        }
    }
}


public static class Response extends BaseResp implements Parcelable {

    public int errCode;
    public String errStr;
    public String transaction;
    public String openId;

    private int type;
    private boolean checkResult;

    public Response(BaseResp baseResp) {
        errCode = baseResp.errCode;
        errStr = baseResp.errStr;
        transaction = baseResp.transaction;
        openId = baseResp.openId;
        type = baseResp.getType();
        checkResult = baseResp.checkArgs();
    }

    @Override
    public int getType() {
        return type;
    }

    @Override
    public boolean checkArgs() {
        return checkResult;
    }


    @Override
    public int describeContents() {
        return 0;
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeInt(this.errCode);
        dest.writeString(this.errStr);
        dest.writeString(this.transaction);
        dest.writeString(this.openId);
        dest.writeInt(this.type);
        dest.writeByte(this.checkResult ? (byte) 1 : (byte) 0);
    }

    protected Response(Parcel in) {
        this.errCode = in.readInt();
        this.errStr = in.readString();
        this.transaction = in.readString();
        this.openId = in.readString();
        this.type = in.readInt();
        this.checkResult = in.readByte() != 0;
    }

    public static final Creator<Response> CREATOR = new Creator<Response>() {
        @Override
        public Response createFromParcel(Parcel source) {
            return new Response(source);
        }

        @Override
        public Response[] newArray(int size) {
            return new Response[size];
        }
    };
}}

3、监听返回接口：

public interface OnResponseListener {

void onSuccess();
void onCancel();
void onFail(String message); }

4、使用：

public class WXShareActivity extends AppCompatActivity implements IWXAPIEventHandler {

private WXshare wxShare;
private Button bluth_btnStart;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_bluth);
    bluth_btnStart= (Button) findViewById(R.id.bluth_btnStart);
    wxShare = new WXshare(this);
    wxShare.register();
    wxShare.setListener(new OnResponseListener() {
        @Override
        public void onSuccess() {
            Log.e("TAG", "onSuccess");
        }

        @Override
        public void onCancel() {
            Log.e("TAG", "onCancel");
        }

        @Override
        public void onFail(String message) {
            Log.e("TAG", "" + message);

        }
    });
    final WXshare share = new WXshare(this);

    bluth_btnStart.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            // 得到当前view所在view结构中的根view
            View vv = v.getRootView();
            // 设置属性
            vv.setDrawingCacheEnabled(true);
            // 取得位图
            share.sharePicture(vv.getDrawingCache(), 0);

        }
    });



}


@Override
protected void onDestroy() {
    wxShare.unregister();
    super.onDestroy();

}

@Override
public void onReq(BaseReq baseReq) {


}

@Override
public void onResp(BaseResp baseResp) {
    Intent intent = new Intent(WXshare.ACTION_SHARE_RESPONSE);
    intent.putExtra(WXshare.EXTRA_RESULT, new WXshare.Response(baseResp));
    sendBroadcast(intent);
}}

注意：

当我们撸完代码，发现点击分享的时候，App动了一下（感觉有跳转，然后没动静了），恭喜大兄弟，开机重启试一下，具体原因不得而知，猜测：大胆猜测是因为release和debug版的原因