private String APP_ID = "00000000000000000"; //微信 APPID
private IWXAPI iwxapi;

private void regToWx() {
    iwxapi = WXAPIFactory.createWXAPI(context, APP_ID, true);//這裏context記得初始化
    iwxapi.registerApp(APP_ID);
}

IMServer.getDiskBitmap(IMServer.url);

這個是我寫的 一個從內存卡讀取照片的類.. 可根據自己需求更改

private void
 
 wxShare() {
    Bitmap bp = IMServer.getDiskBitmap(IMServer.url);
    WXImageObject wxImageObject = new WXImageObject(bp);
    WXMediaMessage msg = new WXMediaMessage();
    msg.mediaObject = wxImageObject;
    //設置縮略圖
    Bitmap mBp = Bitmap.createScaledBitmap(bp, 120, 120, true);
    bp.recycle();
    msg.thumbData 
 
= bmpToByteArray(mBp, true);
    SendMessageToWX.Req req = new SendMessageToWX.Req();
    req.transaction = buildTransaction("img");//  transaction字段用
    req.message = msg;
    req.scene = SendMessageToWX.Req.WXSceneSession;
    iwxapi.sendReq(req);
}

我先上代碼,我們看看上面的代碼..設置縮略圖那

官方給的 代碼是

msg.thumbData = Util.bmpToByteArray(thumbBitmap, true);

然後Util類,居然找不到(我用了qq的jar包,只能在這裏找到.....)

所以我只能去demo裏面找,然後把bmpToByteArray方法提取出來,如下

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;
}

然後再往下看,

  req.transaction = buildTransaction("img");//  transaction字段用

很明顯 後面的是一個方法, 官方也沒給出... 老方法 ,去demo裏面找,如下

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

Android 微信分享圖片