Android 直接打开微信，微博，QQ

Android 使用包名即可打开应用， 当然你也可以自己打印所有报名获取包名，总结下分享平台的包名：

微信：com.tencent.mm
QQ: com.tencent.mobileqq
微博： com.sina.weibo
FACEBOOK: com.facebook.katana
TWITTER: com.twitter.android
instagram: com.instagram.android

如何打开：

/**     * 判断应用是否已安装     *     * @param context     * @param packageName     * @return     */    public static boolean isInstalled(Context context, String packageName) {        boolean hasInstalled = false;        PackageManager pm = context.getPackageManager();        List<PackageInfo> list = pm                .getInstalledPackages(PackageManager.PERMISSION_GRANTED);        for (PackageInfo p : list) {            //print all package            LogUtils.i("p.packageName===" + p.packageName);            if (packageName != null && packageName.equals(p.packageName.toString())) {                hasInstalled = true;                break;            }        }        return hasInstalled;    }

Open:

public static void openCLD(String packageName, Context context) {        PackageManager packageManager = context.getPackageManager();        PackageInfo pi = null;        try {            pi = packageManager.getPackageInfo(packageName, 0);        } catch (PackageManager.NameNotFoundException e) {            ToastFactory.showToast(context, "packageNameNotFound");        }        Intent resolveIntent = new Intent(Intent.ACTION_MAIN, null);        resolveIntent.addCategory(Intent.CATEGORY_LAUNCHER);        resolveIntent.setPackage(pi.packageName);        List<ResolveInfo> apps = packageManager.queryIntentActivities(resolveIntent, 0);        ResolveInfo ri = apps.iterator().next();        if (ri != null) {            String className = ri.activityInfo.name;            Intent intent = new Intent(Intent.ACTION_MAIN);            intent.addCategory(Intent.CATEGORY_LAUNCHER);            ComponentName cn = new ComponentName(packageName, className);            intent.setComponent(cn);            context.startActivity(intent);        }    }