一 . 獲取開發者APP_ID
打開微信開發者平臺 創建應用 獲取APP_ID，一般兩三天審核通過

https://open.weixin.qq.com

二. 集成微信SDK

1. 添加依賴

compile 'com.tencent.mm.opensdk:wechat-sdk-android-without-mta:+'

2. AndroidManifest.xml 設置

<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.READ_PHONE_STATE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

3.調用的頁面 例如MainActivity中

public class MainActivity extends AppCompatActivity {
    private IWXAPI api;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        api = WXAPIFactory.createWXAPI(this, WXEntryActivity.APP_ID, true);
    }

    //分享文本
    public void WeChatShare1(View view) {
        String text = "測試數據";
        WXTextObject textObj = new WXTextObject();
        textObj.text = text;

        initSend(textObj);
    }

    //分享圖片
    public void WeChatShare2(View view) {
        Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher);
        WXImageObject object = new WXImageObject(bitmap);

        initSend(object);
    }

    //分享鏈接
    public void WeChatShare(View view) {
        WXWebpageObject webpage = new WXWebpageObject();
        webpage.webpageUrl = "http://www.baidu.com";

        initSend(webpage);
    }

    private void initSend(WXMediaMessage.IMediaObject webpage) {
        WXMediaMessage msg = new WXMediaMessage();
        msg.title = "測試標題";
        msg.description = "測試說明...";
        msg.mediaObject = webpage;

        SendMessageToWX.Req req = new SendMessageToWX.Req();
        req.transaction = buildTransaction("webpage");
        req.message = msg;
        req.scene = SendMessageToWX.Req.WXSceneSession;    //設置發送到朋友
//        req.scene = SendMessageToWX.Req.WXSceneTimeline;    //設置發送到朋友圈

        api.sendReq(req);
    }

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

三. 設置分享

1. 包名相應目錄下新建包名 wxapi，在里面新建類 WXEntryActivity 繼承自AppCompatActivity即可(名字必須是這兩個)

   
   
   Paste_Image.png

 public class WXEntryActivity extends AppCompatActivity implements IWXAPIEventHandler {
    //申請的appid
    public static final String APP_ID = "申請的ID";
    //第三方app和微信通信的接口
    private IWXAPI api;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        regToWx();
    }

    public void regToWx() {
        //獲取IWXAPI的實例
        api = WXAPIFactory.createWXAPI(this, APP_ID, true);
        //將應用appid注冊到微信
        api.registerApp(APP_ID);
        //回調監聽
        api.handleIntent(getIntent(), this);
    }

    @Override
    public void onReq(BaseReq baseReq) {
    }

    @Override
    public void onResp(BaseResp resp) {
        String result;
        switch (resp.errCode) {
            case BaseResp.ErrCode.ERR_OK:
                result = "分享成功";
                break;
            case BaseResp.ErrCode.ERR_USER_CANCEL:
                result = "取消分享";
                break;
            case BaseResp.ErrCode.ERR_AUTH_DENIED:
                result = "分享被拒絕";
                break;
            default:
                result = "發送失敗";
                break;
        }
        Toast.makeText(this, result, Toast.LENGTH_SHORT).show();
        finish();
    }
}

2. AndroidManifest.xml 添加，用于接受分享后的回掉，否則上一步中onReq()，onResp()無效

<!--微信回調-->
<application>
...
   <activity
       android:name=".wxapi.WXEntryActivity"
       android:exported="true" />
</application>

最后說明：必須要用真機測試 虛擬機會有各種莫名其妙的問題！
最后說明：必須要用真機測試 虛擬機會有各種莫名其妙的問題！
最后說明：必須要用真機測試 虛擬機會有各種莫名其妙的問題！