根据包名开启一个应用

    /**
     * 开启应用
     */
    private void startApp(String packageName) {
        PackageManager pm = getPackageManager();

        Intent intent = pm.getLaunchIntentForPackage(packageName);

        try {
            startActivity(intent);
        } catch (Exception e) {
            // 做错误处理
            Toast.makeText(this, "应用启动失败", Toast.LENGTH_SHORT).show();
        }
    }