打开第三方应用

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判断是否已安装对应应用

    private boolean isInstall(Context context, String packageName) {
        final PackageManager packageManager = context.getPackageManager();//获取packagemanager
        List<PackageInfo> pinfo = packageManager.getInstalledPackages(0);//获取所有已安装程序的包信息
        List<String> pName = new ArrayList<String>();//用于存储所有已安装程序的包名
        //从pinfo中将包名字逐一取出，压入pName list中
        if (pinfo != null) {
            for (int i = 0; i < pinfo.size(); i++) {
                String pn = pinfo.get(i).packageName;
                pName.add(pn);
            }
        }
        return pName.contains(packageName);//判断pName中是否有目标程序的包名，有TRUE，没有FALSE
    }

    private boolean isPkgInstalled(String pkgName) {
        PackageInfo packageInfo = null;
        try {
            packageInfo = this.getPackageManager().getPackageInfo(pkgName, 0);
        } catch (PackageManager.NameNotFoundException e) {
            packageInfo = null;
            e.printStackTrace();
        }
        if (packageInfo == null) {
            return false;
        } else {
            return true;
        }
    }

打开或是下载

    public void open() {
        
        //已安装，打开程序，需传入参数包名："com.tencent.mm"
        if (isInstall(this, "com.tengdi.mobilelaw.mobile.NJ")) {
            Intent intent = new Intent();
            ComponentName cn = new ComponentName("com.tengdi.mobilelaw.mobile.NJ",
                    "com.tengdi.mobilelaw.mobile.NJ.MainActivity");
            intent.setComponent(cn);
            startActivityForResult(intent, RESULT_OK);


        }
        //未安装，跳转至market下载该程序
        else {
            Uri uri = Uri.parse("market://details?id=com.tencent.mm");//id为包名
            // 直接从指定网址下载
            // Uri uri = Uri.parse("http://dldir1.qq.com/foxmail/weixin521android400.apk");

            Intent it = new Intent(Intent.ACTION_VIEW, uri);
            startActivity(it);
        }
    }